CN111292676B

CN111292676B - Electronic device

Info

Publication number: CN111292676B
Application number: CN201910782951.1A
Authority: CN
Inventors: 石明家; 曾名骏; 韦忠光; 丁景隆
Original assignee: Innolux Corp
Current assignee: Innolux Corp
Priority date: 2018-11-20
Filing date: 2019-08-23
Publication date: 2021-09-07
Anticipated expiration: 2039-08-23
Also published as: CN111292676A

Abstract

The invention provides an electronic device, which comprises a power supply unit and an electronic unit. The electronic unit comprises a first switch, a light-emitting unit and a plurality of pulse switches. The first switch is coupled to the power unit and has a gate. The light emitting unit is coupled with the first switch. A plurality of pulse switches are coupled to the gate of the first switch. Therefore, the brightness of the light-emitting unit can be effectively controlled, so that the quality of the electronic device is improved.

Description

Electronic device

Technical Field

Embodiments of the present invention relate to an electronic device, and more particularly, to an electronic device capable of controlling the brightness of a light-emitting unit.

Background

The light emitting elements of the known electronic device can generate light with a brightness (brightness) corresponding to a gray level. However, due to the difference in the manufacturing processes, the brightness of the light emitting elements under the same driving voltage may be different, which may reduce the quality of the display device. Therefore, a new circuit structure design is needed to improve the aforementioned problems.

Disclosure of Invention

In order to solve the problem that the brightness of the light emitting components is different under the same driving voltage, so that the quality of the display equipment can be reduced, the invention provides an electronic device, which is used for changing the circuit design or changing the basic gray voltage to control the brightness of the light emitting unit so as to improve the quality of the electronic device.

An embodiment of the invention provides an electronic device, which comprises a power supply unit and an electronic unit. The electronic unit comprises a first switch, a light-emitting unit and a plurality of pulse switches. The first switch is coupled to the power unit and has a gate. The light emitting unit is coupled with the first switch. A plurality of pulse switches are coupled to the gate of the first switch.

In an embodiment of the invention, the electronic device receives an image data, wherein the image data has a plurality of gray-scale bits, and a number of the pulse switches is equal to a number of the gray-scale bits.

In an embodiment of the present invention, the plurality of pulse switches includes a first pulse switch and a second pulse switch, and a first action time of the first pulse switch is twice a second action time of the second pulse switch.

In an embodiment of the present invention, the first action time includes a first pulse time and a first interval time.

In an embodiment of the invention, the second action time includes a second pulse time and a second interval time, wherein the second interval time is less than or equal to the first interval time.

In an embodiment of the invention, the electronic device is a display apparatus, and the electronic unit is a sub-pixel.

In an embodiment of the invention, the electronic unit includes a capacitor, and the capacitor is coupled to the gate of the first switch.

In an embodiment of the present invention, the plurality of pulse switches include a first pulse switch and a second pulse switch, the electronic device further includes a first data line and a second data line, the first pulse switch is coupled to the first data line, and the second pulse switch is coupled to the second data line.

An embodiment of the invention further provides an electronic device, which includes a first electronic unit and a second electronic unit. The first electronic unit corresponds to the first basic gray voltage. The second electronic unit corresponds to the second basic gray voltages. The first base gray voltages are different from the second base gray voltages.

In another embodiment of the present invention, the first electronic unit and the second electronic unit emit light in different wavelength ranges.

Drawings

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, wherein:

fig. 1 is a schematic diagram of an electronic device according to an embodiment of the invention.

Fig. 2 is a schematic diagram of an electronic device according to another embodiment of the invention.

Fig. 3A is a schematic diagram of an electronic device according to another embodiment of the invention.

Fig. 3B is a schematic diagram of an electronic device according to another embodiment of the invention.

FIG. 4 is a timing diagram of a portion of a pulse signal according to an embodiment of the present invention.

FIG. 5 is another timing diagram of a portion of the pulse signals according to an embodiment of the present invention.

FIG. 6 is another timing diagram of a portion of the pulse signals according to an embodiment of the present invention.

Fig. 7 is a schematic diagram illustrating a driving method of a screen of an electronic device according to an embodiment of the invention.

Fig. 8 is a schematic diagram illustrating another driving manner of a screen of an electronic device according to an embodiment of the invention.

Fig. 9 is a schematic diagram of another driving method of a screen of an electronic device according to an embodiment of the invention.

Fig. 10 is a schematic view of an electronic device according to another embodiment of the invention.

FIG. 11 is a graph of voltage versus current for an electronic unit according to another embodiment of the present invention.

Description of the symbols:

100. 200, 300, 1000: electronic device

110. 1010: power supply unit

120. 210, 310: electronic unit

130: drive unit

1020: a first electronic unit

1021: first drive unit

1030: second electronic unit

1031: second drive unit

1040: control unit

C: capacitor with a capacitor element

C1_ 1-C1 _ N: energy storage capacitor

D1, D2: data line

EM: first switch

SW _1 to SW _ N: second switch

EM1_1, EM1_ 2: third switch

EM2_1, EM2_ 2: the fourth switch

LD, LD _1, LD _ 2: light emitting unit

PM _1 to PM _ N: pulse switch

SL 1-SLM: scanning line

DS 1-DSN: data signal, data receiving terminal

PS1 PSN: pulse signal and pulse receiving terminal

VDD: power supply

V1: voltage of

VSS, VSS1, VSS 2: reference voltage

GV 1: first gray scale voltage

GV 2: second gray scale voltage

GV 3: gray scale voltage

GV 10: first basic gray voltage

GV 20: second basic gray voltages

T11-T1N: time of pulse

T: sum of time

t 11-t 1N: time of action

TD1_ 1-TD 1_ N, TD2_ 1-TD 2_ N: interval of time

F1: frame time of a picture

DPF, DPF 1-DPFM, DPF1_ 1-DPFM _ N: time of data provision

EF. EF1 to EFM, EF1_1 to EFM _ N: time of light emission

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In order to facilitate the understanding of the reader and the simplicity of the drawings, the various drawings of the present invention may depict only some of the entire apparatus and certain components thereof not necessarily to scale.

The present description provides various examples to illustrate the technical features of various embodiments of the present invention. The arrangement, number and size of the components in the embodiments are for illustrative purposes and are not intended to limit the present invention. In addition, if the embodiment is repeated with reference numbers in the drawings, the description is simplified, and the relevance between different embodiments is not intended.

Furthermore, the use of ordinal numbers such as "first," "second," etc., in the specification and claims to modify a claim element does not by itself connote any preceding ordinal number of the claim element, nor does it denote the order of a given claim element from another claim element or the order of a method of manufacture, but are used merely to distinguish one claim element having a certain name from another claim element having a same name.

Fig. 1 is a schematic diagram of an electronic device according to an embodiment of the invention. Referring to fig. 1, the electronic device 100 includes a power unit 110 and an electronic unit 120. The power supply unit 110 provides a power supply VDD, wherein the power supply VDD may be, for example, a system voltage. In an embodiment, the electronic device 100 may include a Liquid Crystal (LC), an Organic Light Emitting Diode (OLED), an inorganic Light Emitting Diode (LED), a Quantum Dot (QD), a fluorescent material, a phosphorescent material, other suitable materials, or a combination thereof, but is not limited thereto. The inorganic light emitting diode may include, for example, a sub-millimeter light emitting diode (mini LED), a micro LED (micro LED), or a quantum dot light emitting diode (QLED/QDLED). In some embodiments, the electronic device 100 may be a display apparatus, a sensing device, an illumination device, an antenna device, a tiled device, a flexible device, other suitable device, or a combination thereof, but is not limited thereto. When the electronic apparatus 100 is a display device, the electronic unit 120 may be a sub-pixel (sub).

In fig. 1, the number of the electronic units 120 is one, but the present invention is not limited thereto. In some embodiments, the electronic device 100 may include a plurality of electronic units 120, a plurality of data lines, and a plurality of scan lines. One electronic unit 120 may include a first switch EM, a light emitting unit LD, and a plurality of pulse switches PM _1 to PM _ N, where N is a positive integer greater than 1. The first switch EM is coupled to the power supply unit 110. In an embodiment, the first switch EM may be a Thin Film Transistor (TFT), but is not limited thereto. The gate of the first switch EM is coupled to the pulse switches PM _1 to PM _ N, one electrode of the first switch EM is coupled to the power unit 110, and the other electrode of the first switch EM is coupled to the light emitting unit LD.

In addition, the electronic unit 120 can be coupled to the corresponding data lines via the data receiving terminals DS1 DSN and/or coupled to the corresponding scan lines via the pulse receiving terminals PS1 PSN. It should be noted that, for convenience of description, the numbers DS1 to DSN in the present invention represent data signals corresponding to different data receiving terminals, in addition to different data receiving terminals. Similarly, the numbers PS1 to PSN in the present invention represent pulse signals corresponding to different pulse receiving terminals, in addition to different pulse receiving terminals. In addition, the pulse receivers PS1 through PSN can be respectively used as gates (gate electrodes) of the corresponding pulse switches PM _1 through PM _ N, or can be respectively coupled to the gates of the pulse switches PM _1 through PM _ N.

In some embodiments, the light emitting unit LD may be an Organic Light Emitting Diode (OLED), an inorganic Light Emitting Diode (LED) such as a submillimeter light emitting diode (mini LED), a micro light emitting diode (micro LED), a quantum dot light emitting diode (QLED/QD-LED), or the like, but is not limited thereto. A first terminal (e.g., an anode terminal) of the light emitting unit LD is coupled to the first switch EM, and a second terminal (e.g., a cathode terminal) of the light emitting unit LD is coupled to a reference voltage VSS (e.g., a ground voltage), but is not limited thereto.

In some embodiments, the pulse switches PM _1 to PM _ N may be thin film transistors, but are not limited thereto. Further, the gates of the pulse switches PM _1 to PM _ N receive the pulse signals PS1 to PSN, respectively. One electrode of each of the pulse switches PM _1 to PM _ N is coupled to the gate of the first switch EM, and the other electrode of each of the pulse switches PM _1 to PM _ N receives the data signals DS1 to DSN, respectively. For example, the pulse switch PM _1 can receive the data signal DS1, the pulse switch PM _2 can receive the data signal DS2, and so on. In some embodiments, the data signals DS1 DSN have a high voltage level "1" or a low voltage level "0", respectively.

In some embodiments, the electronic device 100 can receive and/or display a plurality of image data, wherein the image data can respectively have at least one gray scale number, and the gray scale number has a plurality of gray scale bits, such as N. For example, when the number of gradation bits is 7, the number of gradations representing the image data is 128 (2)⁷128, 0 to 127 gradations), and when the number of gradation bits is 10, the number of gradations representing the image data is 1024 (2)¹⁰1024, 0 to 1023 shades of gray). The rest is analogized.

In some embodiments, the number of pulse switches PM _1 to PM _ N is equal to the number of gray bits N in one electronic unit 120. That is, when the number of gradation bits is 7, the number of pulse switches in one electronic unit 120 is 7, i.e., the pulse switches PM _1 to PM _ 7. When the number of gradation bits is 10, the number of pulse switches in one electronic unit 120 is 10, i.e., pulse switches PM _1 to PM _ 10. The rest is analogized.

Further, the electronic device 100 may further include a driving unit 130. The driving unit 130 is coupled between the power unit 110 and the first switch EM, and the gate of the driving unit 130 receives a voltage V1, wherein the voltage V1 may have a fixed range, but is not limited thereto. In some embodiments, the driving unit 130 may also be a thin film transistor, but is not limited thereto.

Fig. 2 is a schematic diagram of an electronic device according to another embodiment of the invention. Referring to fig. 2, the electronic device 200 includes a power unit 110 and an electronic unit 210. In the present embodiment, the power supply unit 110 is the same as the power supply unit 110 in fig. 1, and reference may be made to the description of the embodiment in fig. 1, so that the description thereof is omitted here.

In the embodiment, one electronic unit 210 includes a first switch EM, a light emitting unit LD, a plurality of pulse switches PM _1 to PM _ N, a driving circuit 130, and a capacitor C, where N is a positive integer greater than 1. In this embodiment, the first switch EM, the light emitting unit LD, the pulse switches PM _1 to PM _ N and the driving circuit 130 are the same as or similar to the first switch EM, the light emitting unit LD, the pulse switches PM _1 to PM _ N and the driving circuit 130 of fig. 1, and reference may be made to the description of the embodiment of fig. 1, so that the description thereof is omitted here.

The capacitor C is coupled to the gate of the first switch EM. Further, a first terminal of the capacitor C is coupled to the gate of the first switch EM, and a second terminal of the capacitor C may be coupled to a reference voltage VSS2 (e.g., ground voltage). In this embodiment, the reference voltage VSS2 may be the same as or different from the reference voltage VSS1 coupled to the light emitting unit LD.

Fig. 3A is a schematic diagram of an electronic device according to another embodiment of the invention. Referring to fig. 3A, the electronic device 300 includes a power unit 110 and an electronic unit 310. In an embodiment, the power supply unit 110 is the same as the power supply unit 110 in fig. 1, and reference may be made to the description of the embodiment in fig. 1, so that the description thereof is omitted here.

In the embodiment, one electronic unit 310 includes a first switch EM, a light emitting unit LD, a plurality of pulse switches PM _1 to PM _ N, a driving circuit 130, a capacitor C, a plurality of storage capacitors C1_1 to C1_ N, and a plurality of second switches SW _1 to SW _ N, where N is a positive integer greater than 1. In an embodiment, the first switch EM, the light emitting unit LD, the pulse switches PM _1 to PM _ N, the driving circuit 130 and the capacitor C are the same as or similar to the first switch EM, the light emitting unit LD, the plurality of pulse switches PM _1 to PM _ N, the driving circuit 130 and the capacitor C in fig. 1, and reference may be made to the description of the embodiment in fig. 1, so that no further description is provided herein. In addition, in the embodiment, the energy storage capacitors C1_ 1-C1 _ N and the second switches SW _ 1-SW _ N are equal in number to the pulse switches PM _ 1-PM _ N, but in some embodiments, the energy storage capacitors or the second switches may not be equal in number to the pulse switches PM _ 1-PM _ N, for example, some pulse switches do not have corresponding energy storage capacitors.

The energy storage capacitors C1_ 1-C1 _ N are respectively coupled to the pulse switches PM _ 1-PM _ N. Further, first terminals of the storage capacitors C1_ 1-C1 _ N are respectively coupled to electrodes of the pulse switches PM _ 1-PM _ N and first terminals of the second switches SW _ 1-SW _ N, and second terminals of the storage capacitors C1_ 1-C1 _ N are respectively coupled to reference voltages VSSD 1-VSSDN (e.g., ground voltage). Similar to the previous embodiment, the reference voltages VSS2, VSSD1 VSSDN may be the same as or different from the reference voltage VSS1 to which the light emitting unit LD is coupled, respectively. In addition, the capacitance values of the capacitor C and the energy storage capacitors C1_ 1-C1 _ N may be the same or different. For example, in some embodiments, the capacitance value of the capacitor C is smaller than the capacitance value of at least one of the storage capacitors C1_ 1-C1 _ N, but is not limited thereto.

The second switches SW _1 to SW _ N are coupled to the energy storage capacitors C1_1 to C1_ N and the data line D1. Further, the first terminals of the second switches SW _1 to SW _ N are respectively coupled to the first terminals of the corresponding energy storage capacitors C1_1 to C1_ N. The second ends of the second switches SW _ 1-SW _ N are coupled to the data line D1. The control terminals of the second switches SW _1 to SW _ N are controlled by control signals (not shown) to be turned on or turned off, respectively, to control whether the data signals DS1 to DSN can be coupled into the electronic unit 310 from the data line D1. The voltage levels of the data signals DS 1-DSN can be, for example, a high voltage level "1" or a low voltage level "0", respectively.

In one embodiment, the second switches SW _1 to SW _ N are coupled to the same data line D1, i.e., the electronic unit 310 provides the data signals DS1 to DSN from the same data line D1, but the invention is not limited thereto. As shown in FIG. 3B, the second switches SW _1 to SW _ N can be respectively coupled to the data lines D1 or D2, i.e., the electronic unit 310 can provide the data signals DS1 to DSN respectively through the different data lines D1 and D2. For example, in some embodiments, the second switches SW _1 to SW _ K are coupled to the data line D1, and the second switches SW _ K +1 to SW _ N are coupled to the data line D2, wherein when N is an even number, K is N/2; when N is an odd number, K is (N +1)/2, but is not limited thereto. In some embodiments, the odd second switches SW _1 to SW _ N-1 are coupled to the data line D1, and the even second switches SW _2 to SW _ N are coupled to the data line D2, but not limited thereto. Thus, the electronic unit 310 coupled to the data lines can speed up data writing (i.e., inputting the data signals DS1 DSN to the electronic unit 310 to charge the storage capacitors C1_ 1C 1_ N).

In the embodiment shown in FIG. 3A or FIG. 3B, the storage capacitors C1_ 1-C1 _ N are charged by the data signals DS 1-DSN, so that the storage capacitors C1_ 1-C1 _ N store charges. Thus, even when the second switches SW _1 to SW _ N are not turned on after the energy storage capacitors C1_1 to C1_ N store charges, the charges stored in the energy storage capacitors C1_1 to C1_ N can be transferred to the capacitor C or used to turn on the first switch EM to make the light emitting unit LD emit light after the pulse switches PM _1 to PM _ N are turned on. That is, after the storage capacitors C1_ 1-C1 _ N have stored the data signals DS 1-DSN, the light emitting cell LD can be driven even though the data lines D1, D2 are not coupled to the electronic unit 310.

In addition, the coupling manner of the second switches SW _1 to SW _ N and the data line D1 or the data line D2 is only an embodiment of the invention, and is not limited to the invention. The user can adjust the coupling manner of the second switches SW _ 1-SW _ N and the data line D1 or the data line D2 to achieve the same effect. In addition, the embodiment of fig. 3B is exemplified by two data lines, but the invention is not limited thereto. The user can adjust the number of the data lines according to the requirement, for example, three or more data lines can also achieve the same effect.

FIG. 4 is a timing diagram of a portion of a pulse signal according to an embodiment of the present invention. The timing diagram of fig. 4 may correspond to the electronic apparatus 100 of fig. 1, but is not limited thereto. In fig. 4, the pulse times T11 to T14 represent the pulse times of the pulse signals PS1 to PS4 at the high voltage level "1", respectively. During the pulse times T11-T14, the pulse switches PM _ 1-PM _4 are turned on by the high-level pulse signals PS 1-PS 4, respectively. The operation times T11-T14 represent the operation times of the pulse switches PM _ 1-PM _4, respectively, and the total time T is the sum of the operation times T11-T1N. It should be noted that the operation time t 11-t 14 of the pulse switches PM _ 1-PM _4 can be the time length from the time when the pulse switches PM _ 1-PM _4 start to turn on until the time when the next pulse switch starts to turn on. For example, in the embodiment, the operation time t11 of the pulse switch PM _1 corresponds to the total time length from the time when the pulse switch PM _1 starts to turn on due to the pulse signal PS1 with the high voltage level until the time when the pulse signal PS2 starts to enter the on state.

Please refer to fig. 1 and fig. 4. In fig. 4, the operation times T11 to T14 of the pulse switches PM _1 to PM _4 are substantially equal to the pulse times T11 to T14, respectively. For example, the time length of the actuation time T11 of the pulse switch PM _1 may correspond to the time length of the pulse time T11, the time length of the actuation time T12 of the pulse switch PM _2 may correspond to the time length of the pulse time T12, and so on. During operation time t11, pulse switch PM _1 is turned on, and the remaining pulse switches PM _2 to PM _4 are turned off. Next, at action time t12, pulse switch PM _2 is turned on, while the remaining pulse switches PM _1, PM _3, PM _4 are turned off, and so on. It should be noted that, in the embodiment of fig. 4, the operation times t 11-t 14 corresponding to the pulse switches PM _ 1-PM _4 are sequentially arranged and do not overlap with each other, that is, the pulse switches PM _ 1-PM _4 are sequentially turned on, and when one of the pulse switches is turned on, the other pulse switches are not turned on, but the invention is not limited thereto, and the turn-on sequence of the pulse switches PM _ 1-PM _4 can be adjusted according to practical design.

In the present invention, the operation times t11 to t1N of the pulse switches PM _1 to PM _ N may be different. Further, the operation time t11 of the pulse switch PM _1 is approximately twice the operation time t12 of the pulse switch PM _2, the operation time t12 of the pulse switch PM _2 is approximately twice the operation time t13 of the pulse switch PM _3, and so on. In the present embodiment, the operation times T11 to T1N of the pulse switches PM _1 to PM _ N are substantially equal to the pulse times T11 to T1N, respectively, so that the time length of the pulse time T11 is also substantially twice the time length of the pulse time T12, the time length of the pulse time T12 is also substantially twice the time length of the pulse time T13, and the rest is analogized.

More specifically, the operation times t11 to t1N of the pulse switches PM _1 to PM _ N may be sequentially decreased by a power of 2, for example. For example, the ratio of the actuation time T11 of the pulse switch PM _1 to the sum of the times T may be 2^N-1/(2^N-1). The ratio of the action time T12 of the pulse switch PM _2 to the time sum T can be 2^N-2/(2^N-1). The ratio of the action time T13 of the pulse switch PM _3 to the time sum T can be 2^N-3/(2^N-1), the rest and so on. It should be noted that, when the number of the pulse switches is larger, i.e. the value N is larger, the number of the gray scales included in the image data is higher, and the action time T11 of the pulse switch PM _1 is closer to 50% of the total time T, and the action time T12 is closer to 25% of the total time T, the rest isAnd so on.

For example, when the image gray scale number N is 10, the image data displayed by the electronic device 100 has a gray scale number of 1024 (2)¹⁰1024) where the darkest state corresponds to a 0 gray and the brightest state corresponds to a 1023 gray. On the other hand, the light emitting unit LD of the electronic device 100 can be coupled to 10 pulse switches PM _1 to PM _10 and generate 1023 (2)^N-1) different luminances to correspond to 1 ~ 1023 grays respectively. In some embodiments of the present invention, the light emitting unit LD of the electronic device 100 emits the brightness corresponding to different gray scales through the coordination of the action time t 11-t 1N of the different pulse switches PM _ 1-PM _ N. For example, in some embodiments, during the time sum T (not shown), if the data signal DS1 is at the high voltage level "1" and the data signals DS 2-DS _10 (not shown) are at the low voltage level "0", although the pulse switches PM _ 1-PM _ N are still turned on sequentially within the different operation times T11-T1N, the electronic unit 120 only receives the data signal DS1 at the high voltage level when the first pulse switch PM _1 is turned on, so that the first switch EM is turned on only within the operation time T11, and the light-emitting unit LD is turned on to emit light at the power VDD. At this time, the brightness exhibited by the light emitting unit LD may correspond to 512 th (2 nd)⁹512) grayscale.

In some embodiments, during the time period T (not shown), if the data signals DS1 and DS3 are at the high voltage level "1" and the data signals DS2, DS _ 4-DS 10 (not shown) are at the low voltage level "0", the brightness exhibited by the light-emitting unit LD can correspond to that of the light-emitting unit 640 (2)⁹+2⁷640) grayscale.

In some embodiments, during the pulse time T11-T110 (not shown), if the data signals DS 1-DS 10 (not shown) are all at the high voltage level "1", the brightness exhibited by the light-emitting unit LD can correspond to 1023 (2)⁹+2⁸+2⁷+2⁶+2⁵+2⁴+2³+2²+2¹+2⁰1023) grayscale. The generation manner of the brightness and the gray scale corresponding to the other light emitting units LD can be referred to as the above description, and thus, the description thereof is omitted.

FIG. 5 is another timing diagram of a portion of the pulse signals according to an embodiment of the present invention. The timing diagram of fig. 5 may correspond to the electronic device 200 of fig. 2, but is not limited thereto. Similarly to fig. 4, in fig. 5, the pulse times T11 to T14 represent pulse times when the pulse signals PS1 to PS4 are at the high voltage level "1". The interval times TD1_1 to TD1_3 are the interval times corresponding to the pulse times T11 to T14, respectively, and the operation times T11 to T13 corresponding to the pulse switches PM _1 to PM _3 are the individual sums of the pulse times T11 to T13 and the corresponding interval times TD1_1 to TD1_ 3. For example, the action time T11 of the pulse switch PM _1 is the pulse time T11 plus the interval time TD1_1, the action time T12 of the pulse switch PM _2 is the pulse time T12 plus the interval time TD1_2, and so on. The time sum T is the sum of all the pulse times T11-T1N and all the interval times TD1_ 1-TD 1_ N.

Referring to fig. 2 and fig. 5, in the present embodiment, the operation times t 11-t 1N of the pulse switches PM _ 1-PM _ N may be set differently, and the operation times t 11-t 1N of the pulse switches PM _ 1-PM _ N are set in a manner similar to that of the embodiment of fig. 4, which can be referred to the description of the embodiment of fig. 4. It should be noted that the pulse switches PM _1 to PM _ N are turned on by the pulse signals PS1 to PSN, so the pulse switches PM _1 to PM _ N are turned off by the interval times TD1_1 to TD1_ N during the operation time t11 to t 1N. For example, the pulse switch PM _1 is turned on at the pulse time T11, but is turned off from the on state to the off state at the interval TD1_ 1. The other pulse switches PM _2 to PM _ N can be analogized.

In the present embodiment, due to the existence of the capacitor C, charges can be stored during the period when the pulse switches PM _1 to PM _ N are turned on, and the first switch EM coupled to the light emitting unit LD can still maintain a conducting state for a period of time under the condition that the pulse switches PM _1 to PM _ N are not turned on. Therefore, the pulse switches PM _1 to PM _ N do not have to be in the on state for the corresponding operation times t11 to t 1N. In other words, during the interval time TD1_ 1-TD 1_ N, the capacitor C may be discharged to maintain the conducting state of the first switch EM.

The interval times TD1_1 to TD1_ N may be set to be the same or different. In addition, in the present embodiment, the generation manner of driving the light emitting unit LD to emit light so that the luminance of the light emitting unit LD corresponds to the gray scale is the same as or similar to that of the embodiment of fig. 4, and reference may be made to the description of the embodiment of fig. 4, so that the description thereof is omitted.

FIG. 6 is another timing diagram of a portion of the pulse signals according to an embodiment of the present invention. Similarly to fig. 5, in fig. 6, the pulse times T11 to T14 represent pulse times when the pulse signals PS1 to PS4 are at the high voltage level "1". TD2_ 1-TD 2_4 are the intervals corresponding to the pulse times T11-T14, respectively. The operation times T11-T14 corresponding to PM _ 1-PM _4 are the respective sums of the pulse times T11-T14 and the interval times TD2_ 1-TD 2_ 4. For example, the action time T11 of the pulse switch PM _1 is the pulse time T11 plus the interval time TD2_1, the action time T12 of the pulse switch PM _2 is the pulse time T12 plus the interval time TD2_2, and so on. The time sum T is the sum of all the pulse times T11-T1N and all the interval times TD2_ 1-TD 2_ N. The difference between fig. 6 and fig. 5 is that the pulse times T11-T1N corresponding to the pulse switches PM _ 1-PM _ N in fig. 6 are relatively close, so that the lengths of the corresponding interval times TD2_ 1-TD 2_ N can be different, for example, the length of the interval time TD2_1 can be greater than the pulse time T11, and the length of the interval time TD2_2 can be greater than the pulse time T12.

In this embodiment, the operation time of the pulse switches PM _1 to PM _ N may be different, and the setting manner of the operation time of the pulse switches PM _1 to PM _ N is the same as that of the embodiment of fig. 4, and reference may be made to the description of the embodiment of fig. 4, so that the description thereof is omitted here.

In addition, in some embodiments, interval time TD2_2 may be set to be less than or equal to interval time TD2_1, interval time TD2_3 may be set to be less than or equal to interval time TD2_2, and interval time TD2_4 may be set to be less than or equal to interval time TD2_ 3. The rest is analogized. In addition, the manner of driving the light emitting unit LD to emit light to make the luminance of the light emitting unit LD correspond to the gray scale is the same as or similar to that of the embodiment of fig. 4, and reference may be made to the description of the embodiment of fig. 4, so that the description thereof is omitted here.

Fig. 7 is a schematic diagram illustrating a driving method of a screen of an electronic device according to an embodiment of the invention. In one embodiment, the driving frequency of the frame is at least 120 Hz. Further, the driving frequency of the frame may also be, for example, 240Hz or 720Hz, but the invention is not limited thereto.

In fig. 7, a Frame Time (Frame Time) F1 of a Frame includes a data providing Time DPF and a light emitting Time EF of the light emitting unit. At least one of the scan lines SL 1-SLM can transmit a plurality of pulse signals PS 1-PSN, and the pulse signals PS 1-PSN respectively correspond to one bit, M is a positive integer greater than 1. For example, the scan line SL1 can transmit the pulse signals PS1 PSN, wherein the pulse signal PS1 corresponds to the 1 st bit, the pulse signal PS2 corresponds to the 2 nd bit, and the pulse signal PSN corresponds to the Nth bit. The rest of the scan lines SL2 SLM and the transmitted pulse signals can be analogized, and therefore, the description thereof is omitted.

In one embodiment, during the data providing time DPF, the data signals DS1 DSN are sequentially provided to the storage capacitors C1_ 1-C1 _ N in the electronic units corresponding to the scan lines SL 1-SLM, respectively, for performing the data writing operation. For example, first, data signals DS 1-DSN are provided to the storage capacitors C1_ 1-C1 _ N of the electronic units corresponding to the scan line SL1 for data writing. Then, data signals DS 1-DSN are provided to the storage capacitors C1_ 1-C1 _ N of the electronic units corresponding to the scan line SL2 for data writing. The data writing modes of SL 3-SLM of the rest scanning lines are similar. In the light emission time EF, the light emitting unit LD may be driven to generate corresponding light according to the embodiment of fig. 6, for example. That is, in the embodiment corresponding to fig. 7, the data signals DS 1-DSN are first provided to the energy storage capacitors C1_ 1-C1 _ N in the electronic units corresponding to the scan lines SL 1-SLM, so as to complete the data writing operation, and then the light emitting units LD of the electronic units corresponding to the scan lines SL 1-SLM are driven, respectively, so that the light emitting units LD generate light with corresponding brightness.

Fig. 8 is a schematic diagram illustrating another driving manner of a screen of an electronic device according to an embodiment of the invention. In one embodiment, the driving frequency of the frame is at least 120 Hz. Further, the driving frequency of the frame may also be, for example, 240Hz or 720Hz, but the invention is not limited thereto.

In FIG. 8, the scan lines SL1 SLM can transmit a plurality of pulse signals PS1 PSN, and the pulse signals PS1 PSN correspond to one bit. For example, the scan line SL1 may transmit the pulse signals PS1 PSN, PS1 corresponding to the 1 st bit, PS2 corresponding to the 2 nd bit, PSN corresponding to the Nth bit, and so on. Similarly, the scan line SL2 may transmit pulse signals PS1 PSN, wherein the pulse signal PS1 corresponds to the 1 st bit, the pulse signal corresponds to the 2 nd bit, and the pulse signal PSN corresponds to the Nth bit. The remaining scan lines SL 3-SLM may be analogized, and thus are not described herein.

Additionally, in some embodiments, the data is generated sequentially to provide the times DPF 1-DPFM. That is, the data-providing time DPF2 is continued after the data-providing time DPF1, the data-providing time DPF3 is continued after the data-providing time DPF2, and the rest is analogized. However, the order of the data providing times DPF 1-DPFM is not limited thereto.

In the data supply time DPF1, data signals DS1 to DSN are input to the storage capacitors C1_1 to C1_ N of the electronic units corresponding to the scan line SL1, so as to perform data writing operation. Then, at the light-emitting time EF1, the light-emitting unit LD corresponding to the electronic unit of the scan line SL1 may be driven, for example, according to the embodiment of fig. 6, so that the light-emitting unit LD generates corresponding light.

At the data supply time DPF2 subsequent to the data supply time DPF1, data signals DS1 to DSN are input to the storage capacitors C1_1 to C1_ N of the electronic units corresponding to the scanning line SL2, and data writing operation is performed. Then, at the light-emitting time EF2, the light-emitting unit LD corresponding to the electronic unit of the scan line SL2 may be driven, for example, according to the embodiment of fig. 6, so that the light-emitting unit LD generates corresponding light. The data supply times DPF 3-DPFM and the light emission times EF 3-EFM corresponding to the other scanning lines SL 3-SLM are analogized. That is, after the data signals DS 1-DSN are provided to the storage capacitors C1_ 1-C1 _ N of the electronic units corresponding to one scan line for data writing operation, the light emitting units LD of the electronic units corresponding to the scan line are driven, so that the light emitting units LD generate corresponding light. Thus, the light emission time EF3 to EFM of the light emitting unit LD of the electronic unit can be effectively increased.

As is apparent from the above description, the difference between fig. 8 and fig. 7 is that in the driving method shown in fig. 7, the light emitting unit LD in the electronic unit starts emitting light only after all the electronic units in the electronic device 100 have completed the data writing operation. In the driving method shown in fig. 8, when the electronic unit corresponding to one scanning line completes the data writing operation, the light emitting unit LD in the electronic unit starts to emit light.

Another difference between fig. 8 and fig. 7 is that, in the driving method shown in fig. 8, the data providing time plus the light emitting time corresponding to each scan line is substantially equal to the frame time F1 of one frame. That is, the data providing time DPF1 plus the lighting time EF1 corresponding to the scanning line SL1 is substantially equal to a frame time F1, the data providing time DPF2 plus the lighting time EF2 corresponding to the scanning line SL2 is substantially equal to a frame time F1 of one frame, and the rest is analogized.

Fig. 9 is a schematic diagram of another driving method of a screen of an electronic device according to an embodiment of the invention. As in the previous embodiment, in one embodiment, the driving frequency of the picture is at least 120 Hz. Further, the driving frequency of the frame may also be, for example, 240Hz or 720Hz, but the invention is not limited thereto.

In fig. 9, the data supply times DPF1_1 to DPFM _ N indicate data supply times of bits received by the electronic units corresponding to the scan lines SL1 to SLM, and the light emission times EF1_1 to EFM _ N indicate light emission times of the light emission units of the electronic units corresponding to the scan lines SL1 to SLM after receiving the bits. The scan lines SL1 SLM may include a plurality of pulse signals PS1 PSN, and the pulse signals PS1 PSN correspond to one bit. For example, the scan line SL1 may transmit the pulse signals PS1 PSN to the corresponding electronic units, the pulse signal PS1 corresponds to the 1 st bit, the pulse signal PS2 corresponds to the 2 nd bit, the pulse signal PSN corresponds to the Nth bit, and so on. The rest of the scan lines SL2 to SLM and the transmitted pulse signals PS1 to PSN can be referred to the above description, and therefore, the description thereof is omitted.

In the driving method shown in fig. 9, one bit corresponds to a data providing time and a light emitting time, respectively. For example, the 1 st bit to the N th bit transmitted by the scan line SL1 correspond to the data providing time DPF1_1 through DPF1_ N and the lighting time EF1_1 through EF1_ N, respectively, the 1 st bit to the N th bit transmitted by the scan line SL2 correspond to the data providing time DPF2_1 through DPF2_ N and the lighting time EF2_1 through EF2_ N, respectively, and the rest is analogized. Furthermore, in some embodiments, the data providing time plus the light emitting time corresponding to each bit of the scan line is substantially equal to the frame time F1 of one frame. That is, the sum of the data providing time DPF1_1 and the light emitting time EF1_1 corresponding to the 1 st bit transmitted by the scan line SL1 is substantially equal to the frame time F1 of one frame. The sum of the data providing time DPF1_2 corresponding to the 2 nd bit transmitted by the scan line SL1 and the lighting time EF1_2 is substantially equal to the frame time F1 of one frame, and the rest is analogized. In the bits transmitted by the remaining scan lines SL2 to SLM, the sum of the data supply time DPF2_1 to DPFM _ N and the light emission time EF2_1 to EFM _ N corresponding to the bits is substantially equal to the frame time F1 of one frame (DPF2_1+ EF2_1 — DPF2_2+ EF2_2 — … — DPFM _ N + EFM _ N — F1).

For example, according to the driving method shown in fig. 9, in the electronic unit corresponding to the scan line SL1, first, in the data providing time DPF1_1, the data signal DS1 with the first bit is provided to the pulse switch PM _1 of the electronic unit corresponding to the scan line SL1 for data writing operation, and then the light emitting time EF1_1 following the data providing time DPF1_1 is conducted, that is, the pulse switch PM _1 with the first bit corresponding to the electronic unit is turned on, and the light emitting unit LD of the electronic unit generates the corresponding light. And at the data providing time DPF1_2, providing a second-bit data signal DS2 to the pulse switch PM _2 of the electronic unit to continue the data writing operation, and turning on the corresponding second-bit pulse switch PM _2 in the electronic unit after the light emitting time EF1_2 following the data providing time DPF1_2, so that the light emitting unit LD of the electronic unit corresponding to the scan line SL1 generates the corresponding light. The remaining data supply time DPF1_ 3-DPF 1_ N corresponding to the scan line SL1 and the driving manner of the light-emitting time EF1_ 3-EF 1_ N are analogized. The driving method of the electronic units corresponding to the remaining scanning lines SL2 to SLM may be analogized.

The biggest difference between the driving methods shown in fig. 8 and 9 is that in the driving method shown in fig. 8, an electronic unit must start driving the light-emitting unit LD after completely receiving the data signal corresponding to the electronic unit, but in the driving method shown in fig. 9, the electronic unit can start emitting light after receiving data of one bit, and does not need to start emitting light after completely receiving data. In this way, the light emission time of the light emitting unit LD of the electronic unit can be more effectively increased.

Fig. 10 is a schematic view of an electronic device according to another embodiment of the invention. Referring to fig. 10, the electronic device 1000 includes a power unit 1010, a first electronic unit 1020, a second electronic unit 1030, and a control unit 1040. In an embodiment, the electronic apparatus 1000 may be a display device, but is not limited thereto. The first electronic unit 1020 and the second electronic unit 1030 may be sub-pixels (sub-pixels), respectively, but are not limited thereto. The power supply unit 1010 supplies a power supply VDD, which is a system voltage.

The first electronic unit 1020 includes a first driving unit 1021, a third switch EM1_1, a fourth switch EM2_1, and a light emitting unit LD _ 1. The first driving unit 1021 is coupled with the power supply unit 1010. In an embodiment, the first driving unit 1021 may be a thin film transistor, but is not limited thereto.

The third switch EM1_1 is coupled to the first drive unit 1021. In an embodiment, the third switch EM1_1 may be a thin film transistor, but is not limited thereto. In addition, the gate of the first switch EM _1 receives a pulse signal PS 1.

The light emitting unit LD _1 is coupled with the third switch EM1_ 1. Further, a first terminal (e.g., an anode terminal) of the light emitting unit LD _1 is coupled to an electrode of the third switch EM1_1, and a second terminal (e.g., a cathode terminal) of the light emitting unit LD _1 is coupled to a reference voltage VSS (e.g., a ground voltage).

The fourth switch EM2_1 is coupled to the control unit 1040. In an embodiment, the fourth switch EM2_1 may be a thin film transistor, but is not limited thereto. Further, the gate of the fourth switch EM2_1 receives a scan signal GS1 and the first gray scale voltage GV1 from the control unit 1040.

The second electronic unit 1030 includes a second driving unit 1031, a third switch EM1_2, a fourth switch EM2_2, and a light emitting unit LD _ 2. The second driving unit 1031 is coupled to the power supply unit 1010. In an embodiment, the second driving unit 1031 may be a thin film transistor, but is not limited thereto.

The third switch EM1_2 is coupled with the second drive unit 1031. In an embodiment, the third switch EM1_2 may be a thin film transistor, but is not limited thereto. In addition, the gate of the third switch EM1_2 receives a pulse signal PS 2.

The light emitting unit LD _2 is coupled with the third switch EM1_ 2. Similarly, the light emitting unit LD _2 may also be a light emitting diode. Further, a first terminal (e.g., an anode terminal) of the light emitting unit LD _2 is coupled to an electrode of the third switch EM1_2, and a second terminal (e.g., a cathode terminal) of the light emitting unit LD _2 is coupled to a reference voltage VSS (e.g., a ground voltage).

The fourth switch EM2_2 is coupled to the control unit 1040. In an embodiment, the fourth switch EM2_2 may be a thin film transistor, but is not limited thereto. Further, the gate of the fourth switch EM2_2 receives a scan signal GS2 and the first gray voltage GV2 from the control unit 1040.

The control unit 1040 couples the fourth switches EM2_1 and EM2_ 2. In an embodiment, the control unit 1040 may be a micro-controller (mcu) or a processor (mcu) or other suitable components, but is not limited thereto. Further, the control unit 1040 is coupled to the fourth switches EM2_1 and EM2_2, and the control unit 1040 provides the first gray voltage GV1 and the second gray voltage GV2 to drive the first driving unit 1021 and the second driving unit 1031, respectively.

Fig. 11 is a graph showing the relationship between the voltage and the current of the first electronic unit 1020 and the second electronic unit 1030 in the embodiment shown in fig. 10.

Please refer to fig. 11. As can be seen from fig. 11, when the voltage gradually increases and exceeds a threshold, a current starts to flow through the electronic units, and the light emitting unit LD _1 in the first electronic unit 1020 and/or the light emitting unit LD _2 in the second electronic unit 1030 are/is driven to emit light. It should be noted that, in some embodiments, the process parameters may be different between the light emitting unit LD _1 in the first electronic unit 1020 and the light emitting unit LD _2 in the second electronic unit 1030 due to different wavelength ranges of the emitted light (e.g., different colors) or other reasons. Because of such a difference, when the same voltage (e.g., the gray voltage GV3) is applied to the first electronic unit 1020 and the second electronic unit 1030, the light emitting unit LD _2 in the second electronic unit 1030 may still be in a state of no current passage to exhibit the darkest 0 gray, but the light emitting unit LD _1 in the first electronic unit 1020 has already a current passage to start light emission. That is, in some embodiments, the first basic gray voltage GV10 for the first electronic unit 1020 to start generating current is different from the second basic gray voltage GV20 for the second electronic unit 1030 to start generating current, so that the first electronic unit 1020 and the second electronic unit 1020 emit light with different wavelength ranges. In other words, a voltage difference exists between the first base gray voltage GV10 and the second base gray voltage GV20, as shown in fig. 11. For example, in some embodiments, the second basic gray voltage GV20 corresponds to a voltage value for generating 8 gray brightness for the first electronic unit 1020, while in other embodiments, the second basic gray voltage GV20 corresponds to a voltage value for generating 16 gray brightness for the first electronic unit 1020, but the voltage value corresponding to the second basic gray voltage GV20 is not limited thereto.

In the embodiment shown in fig. 10 and 11, the control unit 1040 may provide the first gray voltage GV1 and the second gray voltage GV2 to drive the first driving unit 1021 and the second driving unit 1031 respectively according to the difference between the first electronic unit 1020 and the second electronic unit 1030.

For example, the control unit 1040 may be provided with a lookup Table (Mapping Table), wherein the lookup Table records the process parameters of the light emitting unit LD _1 of the first electronic unit 1020 and the corresponding first gray scale voltage GV1, and the process parameters of the light emitting unit LD _2 of the second electronic unit 1030 and the corresponding second gray scale voltage GV 2. When the light emitting unit LD _1 is to be driven, the control unit 1040 looks up the lookup table to generate the first gray scale voltage GV1 corresponding to the light emitting unit LD _1 of the first electronic unit 1020. Thus, the light emitting unit LD _1 generates the luminance corresponding to the first gray voltage GV 1.

Similarly, when the light emitting unit LD _2 is to be driven, the control unit 1040 looks up the look-up table to generate the second gray scale voltage GV2 corresponding to the light emitting unit LD _2 of the second electronic unit 1030. Thus, the light emitting unit LD _2 generates the luminance corresponding to the second gray scale voltage GV 2.

In this embodiment, the control unit 1040 may provide different basic gray voltages according to the difference between the first electronic unit 1020 and the second electronic unit 1030, and may control the light emitting units LD _1 and LD _2 to generate lights with substantially the same brightness, which may improve the quality of the electronic device 1000.

In the embodiment of fig. 10, only the first electronic unit 1020 and the second electronic unit 1030 are taken as examples, but the invention is not limited thereto. In some embodiments, the electronic device 1000 may include three or more electronic units. In addition, when the number of the electronic units is three or more, the driving methods of the electronic units can be referred to the description of the above embodiments, and thus are not described herein again.

In summary, in the electronic device according to the embodiment of the invention, the first switch of the electronic unit is coupled to the power unit, the light-emitting unit of the electronic unit is coupled to the first switch, and the plurality of pulse switches of the electronic unit are coupled to the gate of the first switch. In addition, the electronic device provided by the invention can also provide different basic gray voltages for different electronic units. Therefore, the circuit design can be changed or the basic gray scale voltage can be changed to effectively control the brightness of the light-emitting unit so as to improve the quality of the electronic device.

Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An electronic device, comprising:

a power supply unit; and

an electronic unit, comprising:

a first switch coupled to the power unit, the first switch having a gate;

a capacitor coupled to the gate of the first switch;

a light emitting unit coupled to the first switch; and

a plurality of pulse switches coupled to the gate of the first switch;

the pulse switches include a first pulse switch and a second pulse switch, a first action time of the first pulse switch includes a first pulse time and a first interval time, a second action time of the second pulse switch includes a second pulse time and a second interval time, and the second interval time is less than or equal to the first interval time.

2. The electronic device of claim 1, wherein the electronic device receives an image data, wherein the image data has a plurality of gray scale bits, and a number of the plurality of pulse switches is equal to a number of the plurality of gray scale bits.

3. The electronic device of claim 1, wherein a first actuation time of the first pulse switch is twice a second actuation time of the second pulse switch.

4. The electronic device according to claim 3, wherein the electronic device is a display device and the electronic unit is a sub-pixel.

5. The electronic device of claim 1, further comprising a first data line and a second data line, wherein the first pulse switch is coupled to the first data line and the second pulse switch is coupled to the second data line.