CN113053306B - Light emitting diode display and driving method thereof - Google Patents
Light emitting diode display and driving method thereof Download PDFInfo
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- CN113053306B CN113053306B CN202011566992.6A CN202011566992A CN113053306B CN 113053306 B CN113053306 B CN 113053306B CN 202011566992 A CN202011566992 A CN 202011566992A CN 113053306 B CN113053306 B CN 113053306B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a driving method of a light emitting diode display, which is suitable for the light emitting diode display capable of changing the update rate and reducing the change of brightness due to the variation of the update rate. The method comprises the following steps: an organic light emitting diode of the light emitting diode display is controlled by a transmitting signal with a plurality of frame periods, wherein each of the frame periods is provided with a pulse width modulation part, the pulse width modulation part is provided with a duty ratio, whether a change exists in the update rate of the light emitting diode display is detected, and when the change is detected, a compensation procedure is executed, wherein the compensation procedure compensates a brightness difference of the organic light emitting diode by adjusting the duty ratio of the pulse width modulation part, and the brightness difference is caused by the change in the update rate. The invention also discloses a light-emitting diode display.
Description
Technical Field
The present invention relates to a Light Emitting Diode (LED) display with a changeable refresh rate and a driving method thereof, and more particularly, to a LED display and a driving method thereof for reducing brightness variation due to refresh rate variation.
Background
With the demand for display devices capable of frequently changing the update rate according to different purposes (e.g., movie, file browsing, game, etc.), the change in brightness due to the variation in update rate is an annoying problem for users, and thus there is an increasing desire of display manufacturers to solve the problem for market reasons. The reason why the brightness change occurs when the update rate of a light emitting diode display (e.g., an organic light emitting diode display) is changed is that: the length of the programming portion of the transmit signal (which can be understood as the vertical blanking interval) generally varies in response to the update rate variation. That is, the programmed portion corresponding to a frame displayed immediately after the update rate is changed is generally longer or shorter than the last programmed portion corresponding to the last frame displayed before the change.
Specifically, because of the difference in length of the programming portions and the time period of each frame remaining constant, the Pulse Width Modulation (PWM) portion (which can be understood as the data enable period) of the transmit signal is also shortened or lengthened. Thus, when the PWM part corresponding to the frame displayed after the change in the update rate is longer than the PWM part corresponding to the last frame displayed before the change in the programming part corresponding to the increase, the length of the last enabled period of the PWM part after the change in the update rate is necessarily shorter than the length of the last enabled period of the PWM part before the change in the update rate, and vice versa. Accordingly, since the total time for the light emitting diode receiving the emission signal to emit light is changed, the last enable period of the PWM part, which is changed to be shorter or longer in the update rate, causes a change in brightness.
Disclosure of Invention
In view of the above, the present invention provides a light emitting diode and a driving method thereof that reduce the brightness due to the variation of the refresh rate to meet the above-mentioned needs.
An embodiment of the invention discloses a driving method of a light emitting diode display, which is suitable for the light emitting diode display capable of changing the update rate. The driving method comprises the following steps: controlling an organic light emitting diode of the light emitting diode display with an emission signal having a plurality of frame periods, wherein each of the frame periods has a pulse width modulation portion having a duty cycle; detecting whether a change exists in the update rate of the light emitting diode display; and executing a compensation process when the change is detected, wherein the compensation process compensates a brightness difference of the organic light emitting diode by adjusting the duty ratio of the pulse width modulation part, and the brightness difference is caused by the change of the update rate.
A driving method of a light emitting diode display, adapted to a light emitting diode display capable of changing an update rate, the method comprising: controlling an organic light emitting diode of the light emitting diode display with an emission signal having a plurality of frame periods, wherein each of the frame periods has a pulse width modulation portion having a duty cycle; and changing the duty cycle from an initial duty cycle to a final duty cycle when there is a change in the update rate of the light emitting diode display.
A light emitting diode display capable of changing update rates, the light emitting diode display comprising: a light emitting diode panel having a plurality of pixels; and a controller electrically connected to the pixels, wherein the controller generates a transmit signal having a plurality of frame periods and the controller transmits the transmit signal to one of the pixels, the frame periods each having a pulse width modulation portion having a duty cycle, and wherein the controller varies the duty cycle from an initial duty cycle to a final duty cycle when there is a change in the update rate of the light emitting diode display.
The foregoing description of the disclosure and the following description of embodiments are presented to illustrate and explain the spirit and principles of the invention and to provide a further explanation of the invention as claimed.
Drawings
FIG. 1 is a block diagram of an LED display capable of reducing brightness variation due to refresh rate variation according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a light emitting diode display according to an embodiment of the invention.
FIG. 3 is a voltage diagram of signals transmitted to a pixel of a light emitting diode display according to an embodiment of the present invention.
FIG. 4 is a flow chart of a driving method for reducing brightness variation due to update rate variation according to an embodiment of the invention.
Fig. 5A is a voltage diagram of a transmit signal when the duty cycle of the PWM part is reduced according to an embodiment of the present invention.
Fig. 5B is a voltage diagram of a transmit signal when the duty cycle of the PWM part increases according to an embodiment of the present invention.
FIG. 6 is a block diagram of an LED display capable of reducing brightness variation due to refresh rate variation according to another embodiment of the present invention.
Fig. 7A is a voltage diagram of a transmit signal when the duty cycle of the PWM part is gradually reduced according to an embodiment of the present invention.
Fig. 7B is a voltage diagram of a transmit signal when the duty ratio of the PWM part is gradually increased according to an embodiment of the present invention.
Fig. 8A and 8B are voltage diagrams of the transmit signal when the pre-drive processor is not applied according to an embodiment of the present invention.
Wherein, the reference numerals:
1 processing unit
2 Controller
21 Pre-drive processor
22 Drive processor
3 Data driver
4 Gate driver
5 Display panel
51 Pixel
IN input signal
DE data enable signal
PI image signal
DATA signal of DATA frame
EM transmit signals
VST1, VST2, VST4 signals
T1-T5 transistor
C S capacitor
LED organic light emitting diode
Pf frame period
L PG1 length of Pre-Programming portion
L PG2 length of post-program portion
Length of PWM part before L PWM1
Length of PWM part after L PWM2
Pff previous frame period
Pfl post frame period
Frame period in Pfm
D ONF、DON1、DONL、DON2 Enable period
SI information signal
Detailed Description
The detailed features and advantages of the present invention will be set forth in the detailed description that follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the invention as described herein, as well as the appended claims, as well as the detailed description of the invention which follows, as well as the detailed description of the invention, as described in connection with the appended drawings. The following examples further illustrate the aspects of the invention in detail, but are not intended to limit the scope of the invention in any way.
Please refer to fig. 1 and 2. FIG. 1 is a block diagram of a Light Emitting Diode (LED) display (e.g., OLED display) capable of reducing brightness variations due to update rate variations according to an embodiment of the present invention. Fig. 2 is a circuit diagram of the led display shown in fig. 1. The display of the present embodiment includes a processing unit 1, a controller 2, a data driver 3, a gate driver 4, and a display panel 5. The processing unit 1 receives an input signal IN and controls the data driver 3 and the gate driver 4 through the controller 2, so that the display panel 5 can display a plurality of frames IN the input signal IN.
Specifically, the processing unit 1 may receive the input signal IN to generate the image signal PI and the data enable signal DE based on the input signal IN. The image signal PI contains the content of the frame to be displayed by the display panel 5. The data enable signal DE is used to sequentially enable the plurality of pixels 51 of the display panel 5. The pixels 51 described below may each represent a single color pixel or a sub-pixel of a multi-color pixel. The controller 2 (which may be a timing controller of a general display device) is coupled to the processing unit 1 and receives the image signal PI and the data enable signal DE transmitted by the processing unit 1, and the controller 2 is further coupled to the data driver 3 and the gate driver 4, respectively. Based on the image signal PI and the data enable signal DE, the controller 2 controls the data driver 3 and the gate driver 4 to generate and transmit a plurality of signals to the display panel 5 coupled to the data driver 4 and the gate driver 4. Regarding the pixels 51 of the display panel 5, each pixel 51 in the present embodiment has a structure of 5T1C (5 transistors T1 to T5 and a capacitor Cs) as shown in fig. 2, and emits light of the color of one frame pixel by its organic light emitting diode LED. The structure of each pixel is not limited in the present embodiment, and thus when a pixel 51 other than the 5T1C structure is used, a plurality of signals transmitted to the display panel 5 may be different. For each pixel of different structure, the signal transmitted to each pixel 51 may still include the frame DATA signal DATA from the DATA driver 3 and the emission signal EM from the gate driver 4. Specifically, with this 5T1C structure, the gate driver 4 further transmits the signal VST1, the signal VST2, and the signal VST4 to the respective pixels 51 in addition to the emission signal EM for normally operating the pixels 51. In operation, once the pixels 51 receive signals from the DATA driver 3 and the gate driver 4, the pixels 51 may emit light by controlling the amount of the frame DATA signal DATA emitted by a corresponding one of the pixels 51 and by the emission signal EM for determining the enable time period of each pixel 51.
Referring to fig. 3, a voltage diagram of a plurality of signals including an emission signal EM and transmitted to a pixel 51 is shown to provide a better understanding of the operation. In the present invention, the emission signal EM includes a plurality of frame periods Pf, which are supplied to a plurality of frames to be displayed by the display panel 5, and each frame period Pf is divided into a programming part and a Pulse Width Modulation (PWM) part. The programming section is used to set the pixels 51 ready to emit light, while the PWM section has a duty ratio (duty ratio) to actuate the pixels 51 to emit light during an on-duration of the PWM section. Specifically, in operation of the LED display, when the update rate is changed, the length of the programming portion is correspondingly changed; that is, the length of the programming portion corresponds to the update rate of the light emitting diode display. Since the total length of the programming section and the PWM section (i.e., the length of the frame period Pf) is kept at a constant value, variation in the length of the programming section due to variation in the update rate thus causes variation in the length of the PWM section. The present invention applies a driving method that can suppress a difference in the amount of light emitted from the pixels 51 during the PWM section before and after the update rate variation.
Referring to fig. 1, 2 and 4, fig. 4 is a flowchart illustrating a driving method for reducing brightness variation due to update rate variation according to an embodiment of the invention. In step S1, the organic light emitting diode LED of the light emitting diode display is controlled by the controller 2 by the emission signal EM having the frame periods Pf, and the PWM part has an initial duty cycle, which can be understood as a duty cycle before the compensation process in response to the update rate variation. In step S2, the controller 2 detects whether there is a change in the refresh rate of the led display based on the image signal PI and the data enable signal DE. Specifically, if there is such a change, the update rate before the change is defined as a first update rate, and the update rate with such a change is a second update rate. In step S3, when the controller 2 detects a change in the update rate, a compensation process is performed. This compensation procedure is implemented to compensate for the brightness difference of the organic light emitting diode LED due to the change in the update rate by adjusting the initial duty cycle of the PWM part to a final duty cycle, which may be understood as the duty cycle after the compensation procedure.
In order to suppress the brightness variation caused by the update rate variation, the variation of the length of the programming portion and the adjustment of the duty cycle are preferably (but not limited to) positively correlated, so that the adjustment of the duty cycle can compensate for the brightness difference of the organic light emitting diode LED. Specifically, please refer to fig. 5A and 5B, which are voltage diagrams of the emission signal EM before and after the compensation process. The programming section preceding the compensation procedure will be referred to as a pre-programming section hereinafter for convenience of description later; the PWM section preceding the compensation procedure will be referred to as the front PWM section; the programming section after the compensation procedure will be referred to as a post-programming section; the PWM part after the compensation procedure will be referred to as the post PWM part. In addition, the front programming portion and the front PWM portion are both in a front frame period Pff, and the rear programming portion and the rear PWM portion are both in a rear frame period Pfl.
In fig. 5A, the length L PG2 of the rear programming portion is less than the length L PG1 of the front programming portion due to the update rate variation, and thus the length L PWM2 of the rear PWM portion is greater than the length L PWM1 of the front PWM portion. Therefore, in the compensation procedure, the controller 2 adjusts the duty cycle of the PWM part from the initial duty cycle of the front PWM part to the final duty cycle of the rear PWM part, and the final duty cycle is smaller than the initial duty cycle. Although the last enable period D ON2 of the rear PWM part is longer than the last enable period D ON1 of the front PWM part by a final duty ratio smaller than the initial duty ratio, each of the remaining enable periods D ONL of the rear PWM part is shorter than each of the remaining enable periods D ONF of the front PWM part, The increase in the amount of light caused by the longer last enable period of the PWM part thereafter can be compensated by the decrease in the amount of light caused by the shorter remaining enable period. Similarly, in fig. 5B, the length L PG2 of the rear programming portion is greater than the length L PG1 of the front programming portion due to the update rate variation, and thus the length L PWM2 of the rear PWM portion is less than the length L PWM1 of the front PWM portion. In the compensation procedure, the controller 2 will adjust the duty cycle of the PWM part from the initial duty cycle of the front PWM part to the final duty cycle of the rear PWM part, and the final duty cycle is greater than the initial duty cycle. Thus, the decrease in the amount of light caused by the shorter last enable period D ON2 of the rear PWM part can be compensated by the increase in the amount of light caused by the longer remaining enable period D ONL. In theory, the driving method of the present invention compensates for the increase/decrease in the amount of light caused by the longer/shorter last enable period D ON2 of the PWM part after the decrease/increase in the amount of light caused by the shorter/longer remaining enable period D ONL as much as possible.
In particular, it is understood that the PWM part may be divided into a plurality of segments (fractions), and each of a plurality of enable periods of the PWM part occupies a portion of the segments, and the duty cycle of this PWM part may be expressed as a ratio of the number of segments of an enable period to the number of segments of the entire period of the PWM part (i.e., the total number of segments of the enable period and the off period). In the compensation procedure of the present invention, in some cases, the variation in the length of the programming section cannot be evenly distributed over each enabled period because the number of increases or decreases in the segments of the post PWM section cannot be divided by the number of enabled periods thereof. In these cases, by the compensation procedure, the difference between the length variation of the programming portion and the total amount of variation of the activation periods due to the adjustment of the duty cycle does not exceed the product of the number of activation periods and the time period of the segment. Specifically, in an ideal case, the total amount of variation of the enabling periods due to the adjustment of the duty ratio is equal to the length variation of the programming portion of the last enabling period of the shorter/longer post PWM portion, that is, the increase or decrease of the number of segments of the post PWM portion is divided by the number of enabling periods. In other words, in this ideal case, the variation in the length of the programming portion is equal to the total amount of variation in the activation periods due to the adjustment of the duty cycle.
In addition, in order to quickly adjust the duty ratio of the activation period when the update rate variation occurs (as shown in fig. 6), the controller 2 may have a pre-drive processor 21 and a drive processor 22. The pre-driving processor 21 is electrically connected to the processing unit 1 to receive the image signal PI and the data enable signal DE, so as to detect whether there is a change in the update rate. The driving processor 22 is coupled to the pre-driving processor 21, the processing unit 1, the data driver 3 and the gate driver 4. In operation, the pre-drive processor 21 receives the image signal PI and the data enable signal DE at a first point in time earlier than the drive processor 22, and when a change in the update rate is detected, the pre-drive processor 21 calculates a desired final duty cycle based on the image signal PI and the data enable signal DE and generates the information signal SI having the final duty cycle information. The driving processor 22 receives the image signal PI, the data enable signal DE and the information signal SI at a second time point at least one frame time later than the first time point, and performs a compensation process to generate outputs thereof to the data driver 3 and the gate driver 4. Thus, while slightly delaying the output to the data driver 3 and the gate driver 4, the signal generated by the driving processor 22 can rapidly respond to variations in the length of the programming portion in the same frame period Pf to vary the duty cycle to accurately minimize the brightness variation caused by variations in the refresh rate as shown in fig. 5A and 5B.
Another method performed based on the above structure is shown in fig. 7A and 7B. As shown in fig. 7A and 7B, among the frame periods Pf, there is a middle frame period Pfm between the front frame period Pff and the rear frame period Pfl, and the middle frame period Pfm has a PWM part having a middle duty ratio between the initial duty ratio and the final duty ratio. That is, the duty cycle is gradually adjusted during the compensation procedure. Although fig. 7A and 7B show only one middle frame period between the front frame period Pff and the rear frame period Pfl, there may be more than one middle frame period Pfm therebetween, wherein the middle duty cycle of the PWM portion of these middle frame periods Pfm gradually increases or decreases from the initial duty cycle to the final duty cycle.
Furthermore, the above structure of the controller 2 having the pre-driving processor 21 and the driving processor 22 is merely an example of the present invention, and the present invention is not limited thereto. Specifically, in the embodiment in which the controller 2 does not have the pre-driving processor 21, when the change of the update rate occurs, the driving processor 22 detects the change of the update rate based on the image signal PI and the data enable signal DE and performs the compensation process. In this embodiment, the drive processor 22 may still initiate the compensation procedure early enough to cause the transmit signal EM to have the waveforms shown in fig. 5A, 5B, 7A and 7B, for example, to begin the compensation procedure during the programming portion of the subsequent frame period. This may occur during the drive processor 22 detects a change in update rate during the previous frame period Pff, or even during the programming portion of the subsequent frame period Pfl of fig. 5A and 5B, or during the middle frame period Pfm of fig. 7A and 7B. However, in this embodiment, since the controller 2 does not have the pre-drive processor 21 to calculate the final duty before the start of the post-frame period Pfl shown in fig. 5A and 5B or the PWM part of the mid-frame period Pfm shown in fig. 7A and 7B, there may be a mid-frame period Pfm of the PWM part with the initial duty as shown in fig. 8A and 8B. Fig. 8A and 8B illustrate that the drive processor 22 detects a change in the update rate during the middle frame period Pfm and begins the compensation process at the next frame period Pf of the middle frame period Pfm such that the PWM portion of the next frame period Pf of the middle frame period Pfm (e.g., the later frame period Pfl of fig. 8A or 8B) may have a final duty cycle responsive to the update rate change. Similarly, although fig. 8A and 8B only show a rapid adjustment of the duty cycle from the initial duty cycle to the final duty cycle, there may be more than two mid-frame periods Pfm between the previous and subsequent frame periods Pff and Pfl for gradual adjustment of the duty cycle.
In view of the above, by implementing the driving method disclosed in the present invention, the change in the amount of light due to the variation in the update rate can be compensated for by the adjustment of the duty ratio of the PWM portion of the frame period Pf, thereby reducing the change in the luminance due to the variation in the update rate as much as possible. In addition, this driving method can be realized not only by a controller having two driving processors including a pre-driving processor but also by a controller without a pre-driving processor.
Claims (25)
1. A driving method of a light emitting diode display, which is applicable to a light emitting diode display capable of changing an update rate, the method comprising:
controlling an organic light emitting diode of the light emitting diode display by a transmitting signal with a plurality of frame periods, wherein each frame period is provided with a pulse width modulation part, the pulse width modulation part is provided with a duty ratio, the transmitting signal is divided into the pulse width modulation part and a programming part, and a length of the programming part corresponds to the updating rate of the light emitting diode display;
detecting whether a change exists in the update rate of the light emitting diode display; and
And executing a compensation process when the change is detected, wherein the compensation process compensates a brightness difference of the organic light emitting diode by adjusting the duty ratio of the pulse width modulation part, and the brightness difference is caused by the change of the update rate.
2. The method of claim 1, wherein the change in the update rate causes a variation in the length of the programming portion, and the variation in the length of the programming portion is positively correlated with an adjustment of the duty cycle.
3. The method of claim 2, wherein the pwm portion has a plurality of enable periods, each of the enable periods including a plurality of segments, and wherein a difference between the variation in the length of the programming portion and a total amount of variation in the enable periods due to the adjustment of the duty cycle does not exceed a product of a number of the enable periods and a period of the segments.
4. The method of claim 3, wherein the total amount of variation in the enable periods due to the duty cycle adjustment is equal to the variation in the length of the programming portion.
5. The method of claim 1, wherein the update rate before detecting whether the change in the update rate of the led display is present is a first update rate, the update rate with the change is a second update rate, the duty cycle before the compensation process is an initial duty cycle, and the duty cycle after the compensation process is a final duty cycle.
6. The method of claim 5, wherein a middle frame period exists between a front frame period and a rear frame period of the frame periods, and the front frame period and the middle frame period each have a pwm portion with the initial duty cycle, and the rear frame period has a pwm portion with the final duty cycle.
7. The method of claim 6, wherein the compensation process starts during the middle frame period.
8. The method of claim 5, wherein a preceding frame period of the frame periods is adjacent to a following frame period of the frame periods, the preceding frame period having a pwm portion with the initial duty cycle, and the following frame period having a pwm portion with the final duty cycle.
9. The method of claim 8, wherein the compensation process starts during the programming portion of the post-frame period.
10. The method of claim 5, wherein a middle frame period among the frame periods is between a front frame period and a rear frame period among the frame periods, the front frame period having a pulse width modulation portion with the initial duty cycle, the rear frame period having a pulse width modulation portion with the final duty cycle, and the middle frame period having a pulse width modulation portion with a duty cycle between the initial duty cycle and the final duty cycle.
11. The method of claim 10, wherein the compensation process starts during the programming portion of the post-frame period.
12. The driving method of a light emitting diode display according to claim 1, wherein controlling the organic light emitting diode of the light emitting diode display comprises: transmitting an image signal and a data enable signal to a pre-driving processor at a first time point to selectively generate an information signal, transmitting the image signal and the data enable signal to a driving processor at a second time point which is at least one frame period later than the first time point, and generating the transmitting signal by the driving processor based on the image signal and the data enable signal or based on the image signal, the data enable signal and the information signal.
13. The method of claim 12, wherein detecting whether the change in the refresh rate of the led display is performed by the pre-driving processor, the compensation process is performed by the driving processor, and the information signal is generated when the change is detected.
14. The method of claim 1, wherein the emission signal is generated by a controller of the led display and transmitted to a pixel of the led display, wherein the pixel has the organic led.
15. A driving method of a light emitting diode display, which is applicable to a light emitting diode display capable of changing an update rate, the method comprising:
Controlling an organic light emitting diode of the light emitting diode display by a transmitting signal with a plurality of frame periods, wherein each frame period is provided with a pulse width modulation part, the pulse width modulation part is provided with a duty ratio, the transmitting signal is divided into the pulse width modulation part and a programming part, and a length of the programming part corresponds to the updating rate of the light emitting diode display; and
When there is a change in the update rate of the LED display, the duty cycle is changed from an initial duty cycle to a final duty cycle.
16. The method of claim 15, wherein a middle frame period exists between a front frame period and a rear frame period of the frame periods, and the front frame period and the middle frame period each have a pwm portion with the initial duty cycle, and the rear frame period has a pwm portion with the final duty cycle.
17. The method of claim 15, wherein a preceding frame period of the frame periods is adjacent to a following frame period of the frame periods, the preceding frame period having a pwm portion with the initial duty cycle, and the following frame period having a pwm portion with the final duty cycle.
18. The method of claim 15, wherein a middle frame period among the frame periods is between a front frame period and a rear frame period among the frame periods, the front frame period having a pwm portion with the initial duty cycle, the rear frame period having a pwm portion with the final duty cycle, and the middle frame period having a pwm portion with a duty cycle between the initial duty cycle and the final duty cycle.
19. A light emitting diode display capable of changing its update rate, the light emitting diode display comprising:
a light emitting diode panel having a plurality of pixels; and
A controller electrically connected to the pixels,
Wherein the controller generates a transmit signal having a plurality of frame periods and the controller transmits the transmit signal to one of the pixels, the frame periods each having a pulse width modulated portion having a duty cycle, and wherein when there is a change in the update rate of the light emitting diode display, the controller changes the duty cycle from an initial duty cycle to a final duty cycle,
The emission signal is divided into the pulse width modulation part and a programming part, and a length of the programming part corresponds to the update rate of the LED display.
20. The led display of claim 19, wherein a middle frame period of the frame periods exists between a front frame period and a rear frame period of the frame periods, and both the front frame period and the middle frame period have a pwm portion with the initial duty cycle, and the rear frame period has a pwm portion with the final duty cycle.
21. The led display of claim 19, wherein a preceding one of the frame periods is adjacent to a following one of the frame periods, the preceding frame period having a pwm portion with the initial duty cycle, and the following frame period having a pwm portion with the final duty cycle.
22. The led display of claim 19, wherein a middle frame period of the frame periods is between a front frame period and a rear frame period of the frame periods, the front frame period having a pwm portion with the initial duty cycle, the rear frame period having a pwm portion with the final duty cycle, and the middle frame period having a pwm portion with a duty cycle between the initial duty cycle and the final duty cycle.
23. The led display of claim 19, wherein the controller comprises a pre-driving processor and a driving processor, the pre-driving processor is electrically connected to the driving processor, the driving processor is electrically connected to the pixels, and the pre-driving processor and the driving processor are both configured to receive an image signal and a data enable signal.
24. The led display of claim 23, wherein the pre-driving processor receives an image signal and a data enable signal at a first time point to selectively generate an information signal, and the driving processor receives the image signal and the data enable signal at a second time point at least one frame period later than the first time point, and generates the transmit signal based on the image signal and the data enable signal, or generates the transmit signal based on the image signal, the data enable signal, and the information signal.
25. The led display of claim 23, wherein the pre-drive processor detects the presence of the change in the update rate based on the image signal and the data enable signal, and generates an information signal when the change is detected, and when the drive processor receives the information signal, changes the duty cycle from an initial duty cycle to a final duty cycle.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201962953805P | 2019-12-26 | 2019-12-26 | |
| US62/953,805 | 2019-12-26 | ||
| US16/996,821 US11508305B2 (en) | 2019-12-26 | 2020-08-18 | Light emitting diode display and driving method thereof for reducing brightness change due to refresh rate variation |
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| US11928795B2 (en) | 2021-03-03 | 2024-03-12 | Google Llc | Filtering pulse-width modulated (PWM) noise from a fingerprint image captured with an optical under-display fingerprint sensor (UDFPS) |
| US11488533B2 (en) | 2021-08-03 | 2022-11-01 | Google Llc | Delaying anode voltage reset for quicker response times in OLED displays |
| US11842678B2 (en) | 2021-10-12 | 2023-12-12 | Google Llc | High-brightness mode on an OLED display |
| US11557253B2 (en) | 2022-05-10 | 2023-01-17 | Google Llc | Image retention mitigation via voltage biasing for organic lighting-emitting diode displays |
| US12106733B2 (en) | 2022-09-14 | 2024-10-01 | Google Llc | Rejecting display leakage light in under-display sensors |
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