JP3800831B2 - Display device and electronic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a current-driven type light emitting element such as a so-called light emitting polymer (that is, a driving type in which the light emission luminance changes in accordance with the amount of current passed through the element), and a thin film transistor for controlling the light emitting operation of the light emitting element ( Hereinafter, it belongs to the technical field of an active matrix display device having a TFT (Thin Film Transistor)) for each pixel portion, and more specifically, to the technical field of a driving method of the light emitting element.
[0002]
[Prior art]
Conventionally, as an active matrix display device using a TFT, the TFT is provided for each pixel portion, and a voltage is applied between a pixel electrode and a counter electrode that are arranged to face each other with a liquid crystal layer interposed therebetween. A so-called liquid crystal display device that displays an image or the like by driving the liquid crystal layer is widely used.
[0003]
Here, as a TFT used in the liquid crystal display device, a polysilicon TFT in which a semiconductor layer is formed using polysilicon is generally used for the reason that deterioration with time is small.
[0004]
When an image or the like is displayed by driving a liquid crystal display device using the polysilicon TFT, the TFT arranged for each pixel portion is driven by either a so-called dot sequential method or a line sequential method. It was normal to do.
[0005]
Here, the dot sequential method means that a plurality of TFTs connected to one scanning line are simultaneously kept on for a predetermined time (for example, one horizontal scanning period in an image to be displayed) This is a driving method in which an image is displayed by sequentially supplying data signals one by one to TFTs for one row that are in an on state within a predetermined time.
[0006]
On the other hand, in recent years, as an active matrix type display device similar to the above-mentioned liquid crystal display device, it is self-luminous and does not require a backlight or the like as in a liquid crystal display device, has a low viewing angle dependency, and further has an element fabrication. For reasons such as being easy, research and development on self-luminous display devices using a current-driven light-emitting material such as a light-emitting polymer or organic EL (ElectroLuminescence) in a thin film has been actively conducted.
[0007]
[Problems to be solved by the invention]
However, in the above self-luminous display device, considering the case where the light emitting material formed for each pixel unit is driven by a polysilicon TFT for each pixel unit, the image display area is driven by the conventional dot sequential driving method. When viewed as a whole, there is a problem that uneven brightness occurs depending on the location in the image display area, and a clear image cannot be obtained.
[0008]
That is, since the self-luminous display device uses a current-driven light-emitting material, luminance changes according to the amount of current flowing. On the other hand, when the conventional dot sequential driving method is applied, the data signal is applied at the first timing in the period in which all the polysilicon TFTs corresponding to one scanning line are simultaneously turned on. The total current amount supplied to the pixel portion and the pixel portion to which the data signal is applied at the last timing in the period are different.
[0009]
More specifically, for example, in a plurality of pixel portions corresponding to one scanning line in which all the included TFTs are simultaneously turned on during one horizontal scanning period, When comparing the pixel portion to which the data signal is applied at the first timing and the pixel portion to which the data signal is applied at the last timing in the period, the data signal is applied at the first timing. The timing at which the application of the data signal to the light emitting material in the pixel portion is started earlier than the timing at which the application of the data signal to the light emitting material in the pixel portion to which the data signal is applied at the last timing. However, the supply of the data signal to each of the light emitting materials in the pixel portion for one scanning line ends at the timing when all the TFTs are turned off at the same time (the timing at which one horizontal scanning period ends). Data is held by the capacity of the line. Therefore, the application time of the data signal to the light emitting material in the pixel portion to which the data signal is applied at the first timing is the application time of the data signal to the light emitting material in the pixel portion to which the data signal is applied at the last timing. Longer than. Therefore, as a result, the amount of current flowing through the light emitting material in the pixel portion to which the data signal is applied at the first timing is larger than the amount of current flowing through the light emitting material in the pixel portion to which the data signal is applied at the last timing. Therefore, the total current amount supplied to the pixel portion to which the data signal is applied at the first timing and the pixel portion to which the data signal is applied at the last timing are different. It is.
[0010]
If a difference in the amount of supply current as described above occurs between the pixel portions corresponding to one scanning line, the amount of current supplied is large in the pixel portion to which the data signal is supplied at the first timing. On the other hand, in the pixel portion to which the data signal is supplied at the last timing, since the amount of current supplied is small, the luminance is low, and as a result, when the entire image display area is viewed, The pixel portion to which the data signal is supplied becomes brighter at one timing, and the pixel portion to which the data signal is supplied becomes darker at the last timing.
[0011]
Therefore, the present invention has been made in view of the above problems, and its problem is to prevent occurrence of luminance unevenness in an active matrix display device using a current-driven light-emitting material, thereby achieving a clear image. It is an object of the present invention to provide a display device capable of obtaining the above and an electronic apparatus including the display device.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the invention described in claim 1 is a plurality of current-driven light-emitting polymers formed into a thin film and contained in a plurality of pixel portions formed in a matrix on a substrate. And a driving means such as a data line driving circuit for driving each of the light emitting means line-sequentially.
[0013]
According to the operation of the first aspect of the present invention, the thin film current-driven light emitting means is included in each of the pixel portions formed in a matrix on the substrate.
[0014]
Then, the driving means drives each light emitting means line by line.
[0015]
Therefore, since a plurality of current-driven light emitting means arranged in a matrix are driven line-sequentially, the application of the drive current to the light emitting means starts simultaneously and the application of the drive current ends simultaneously. Become.
[0016]
Therefore, the amount of current supplied to each light emitting means becomes equal to each other, so that it is possible to prevent the occurrence of luminance unevenness in the entire display device as compared with the case where each light emitting means is driven dot-sequentially.
[0017]
In order to solve the above-described problems, the invention according to claim 2 is the display device according to claim 1, and is provided for each pixel row and is supplied with scanning signals corresponding to display information to be displayed. A plurality of scanning lines, a plurality of data lines provided for each pixel column so as to intersect the scanning lines, and a plurality of data lines to which data signals corresponding to the display information are respectively supplied, and each of the pixel portions. In addition, each of the pixel portions is connected to the scanning line, the data line, and the light emitting unit, and the light emission is performed by supplying the data signal to the light emitting unit corresponding to the scanning signal supplied from the scanning line. And a plurality of drive switching means such as TFTs for driving the means.
[0018]
According to the operation of the invention described in claim 2, in addition to the operation of the invention described in claim 1, scanning signals corresponding to display information are respectively provided on the plurality of scanning lines provided for each pixel row. Supplied.
[0019]
On the other hand, data signals corresponding to display information are respectively supplied to a plurality of data lines provided for each pixel column so as to intersect the scanning lines.
[0020]
A plurality of drive switching means provided for each pixel portion and connected to the scanning line, the data line, and the light emitting means in each pixel portion respectively supply the data signal to the light emitting means corresponding to the scanning signal. The light emitting means is driven.
[0021]
Therefore, since each pixel unit includes a drive switching unit, a high-definition image can be displayed.
[0022]
In order to solve the above-described problems, the invention described in claim 3 is configured such that each of the drive switching means is a thin film transistor formed of polysilicon in the display device according to claim 2.
[0023]
According to the operation of the invention described in claim 3, in addition to the operation of the invention described in claim 2, each drive switching means is a thin film transistor formed of polysilicon, so that the light emitting means is driven. Even if a large current flows for a long period of time, the driving capability for the light emitting means does not decrease.
[0024]
In order to solve the above-described problem, according to a fourth aspect of the present invention, in the display device according to the second or third aspect, the driving means is provided for each of the pixel columns, and the data signal storing means is provided. A first switching means such as a plurality of switches for activating the supply to the storage; a storage means such as a plurality of capacitors connected to each of the first switching means for storing the supplied data signal; and Second switching means such as a plurality of switches that are respectively connected to the storage means and supply the stored data signals to the plurality of drive switching means simultaneously at a timing corresponding to the display information.
[0025]
According to the operation of the invention described in claim 4, in addition to the operation of the invention described in claim 2 or 3, the plurality of first switching means provided for each pixel column in the driving means Kill the supply to the storage means.
[0026]
On the other hand, a plurality of storage means respectively connected to each first switching means in the drive means temporarily store the supplied data signal.
[0027]
A plurality of second switching means connected to each storage means in the drive means simultaneously supplies the stored data signals to the plurality of drive switching means at a timing corresponding to the display information.
[0028]
Therefore, the light emitting means in each pixel portion can be efficiently driven in a line sequential manner.
[0029]
In order to solve the above problems, the invention according to claim 5 is configured such that each of the light emitting means is a light emitting polymer in the display device according to any one of claims 1 to 4. Is done.
[0030]
According to the operation of the invention described in claim 5, in addition to the operation of the invention described in any one of claims 1 to 4, since each light emitting means is a light emitting polymer, a high brightness image can be obtained. can get.
[0031]
In order to solve the above problem, an electronic device according to a sixth aspect includes the display device according to any one of the first to fifth aspects.
[0032]
According to the operation of the sixth aspect of the invention, since the display device according to any one of the first to fifth aspects is provided in the electronic device, an image without uneven brightness can be displayed.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings.
[0034]
(I)First embodiment of display device
First, a first embodiment according to the present invention will be described with reference to FIGS.
[0035]
First, the outline of the overall configuration of the active matrix display device according to the first embodiment will be described with reference to FIG.
[0036]
As shown in the plan view of FIG. 1, in the display device 1 of the embodiment, the central portion of the transparent substrate 10 that is the base is a display unit 2 that actually displays an image. Then, in the outer peripheral portion of the transparent substrate 10 other than the display portion 2, the data signal is sent to the data line 6 on the upper side and the lower side in FIG. 1 based on the image signal corresponding to the image to be displayed. A data line driving circuit 3 as driving means for outputting, and an inspection circuit 4 for inspecting the quality, defects and the like of the display device 1 during manufacture or at the time of shipment are formed.
[0037]
A scanning line driving circuit 5 that outputs a scanning signal to be described later to the scanning line 7 based on an image to be displayed is formed on the left side in FIG.
[0038]
Further, on the transparent substrate 10, a mounting terminal 9 for inputting the image signal, various voltages, a pulse signal, and the like from the outside is formed outside the inspection circuit 4.
[0039]
Here, in the display unit 2, one pixel unit 11 is formed in a region where one data line 6 and one scanning line 7 intersect, and the pixel unit 11 will be described later (FIG. 3). As shown, a light emitting polymer as a light emitting means, a driving TFT, and the like are provided.
[0040]
Further, in the display unit 2, a capacitor line 8 for a storage capacitor, which will be described later (see FIG. 3), is arranged in parallel with the scanning line 7 in each pixel unit 11.
[0041]
Next, constituent members included in the pixel portion 11 described above will be described with reference to FIGS. 2 is a plan view showing the arrangement of TFTs and the like formed in the pixel portion 11 by thin film technology, and FIG. 3 is an equivalent circuit for each pixel portion 11.
[0042]
As shown in FIG. 2, a light-emitting polymer (which is described later) is formed on a non-light-emitting side surface in one pixel portion 11 (more specifically, a spacer layer, an organic light-emitting layer, and a hole injection). The pixel electrode 12 for applying a current to the pixel electrode 12 and data for the pixel electrode 12. A TFT 13 is formed as drive switching means for supplying an image signal from the line 6. At this time, the TFT 13 and the pixel electrode 12 are formed in a thin film, and the TFT 13 further includes a semiconductor layer made of polysilicon (a semiconductor layer in which a channel region, a source region, and a drain region are formed). ing.
[0043]
Further, the capacitor line 8 for forming a storage capacitor to be described later (see FIG. 3) with the pixel electrode 12 at a position on the light emitting side facing the pixel electrode 12 with the light emitting polymer interposed therebetween. Is arranged.
[0044]
Next, an equivalent circuit of each component included in one pixel portion 11 will be described with reference to FIG.
[0045]
As shown in FIG. 3, in one pixel portion 11, the gate electrode G of the TFT 13 is connected to the scanning line 7, the source electrode S is connected to the data line 6, and the drain electrode D is the light emitting polymer 14. The storage capacitor 15 is connected to one end of the storage capacitor 15, respectively. The other ends of the light emitting polymer 14 and the storage capacitor 15 are commonly connected to a predetermined fixed potential (not shown) (ground potential in the first embodiment).
[0046]
Next, the light emission operation in one pixel portion 11 will be described using the equivalent circuit shown in FIG.
[0047]
In the initial state where the light emitting polymer 14 is turned off, the scanning signal is not applied to the scanning line 7, and therefore the TFT 13 is in the off state.
[0048]
Next, a data signal (analog signal) corresponding to the image signal is supplied to the data line 6 by an operation of the data line driving circuit 3 to be described later, and further, at a timing corresponding to the supply of the data signal to be described later. 7, when a scanning signal which is a digital signal is applied from the scanning line driving circuit 5, the TFT 13 is turned on, and the data signal transmitted through the data line 6 flows from the source electrode S to the drain electrode D, and further, the write signal is written. Applied to the emitting polymer 14 and the storage capacitor 15.
[0049]
Then, the light emitting polymer 14 starts to emit light at a luminance proportional to the amount of current of the data signal to which the light emitting polymer 14 is applied, and electric charge starts to be accumulated in the storage capacitor 15.
[0050]
Thereafter, even when the supply of the data signal from the data line 6 is finished, the current continues to flow through the light emitting polymer 14 due to the charge accumulated in the storage capacitor 15 and the light emission is continued.
[0051]
Next, the configuration and operation of the data line driving circuit 3 according to the first embodiment will be described with reference to FIGS. 4 is a block diagram showing a schematic configuration of the data line driving circuit 3, and FIG. 5 is a timing chart for explaining its operation.
[0052]
As shown in FIG. 4, the data line driving circuit 3 according to the first embodiment has an image signal line 20 that supplies the image signal Ssig from the outside to the switches 22a, 22b,. A control signal Ssw for ON / OFF control of the switches 22a, 22b,... 22m provided for each data line 6a, 6b,.₁, Ssw₂... Data line drive shift register 3 'for outputting Sswm (each a digital signal) and the control signal Ssw₁, Ssw₂... Sswm is transmitted to the switches 22a, 22b ... 22m, control signal lines 24a, 24b ... 24m, the switches 22a, 22b ... 22m as the first switching means, and a latch signal Slt (the image signal Ssig described later) from outside. To the data lines 6a, 6b,... 6m, and a latch signal line 21 for supplying the latch signals Slt) to the switches 23a, 23b,. The switches 23a, 23b,... 23m as second switching means provided for every 6a, 6b,... 6m, and capacitors 25a, 25b,... 25m as storage means provided for each data line 6a, 6b,. And 26a, 26b... 26m, and data signals Sa and S to be described later to be supplied to the data lines 6a, 6b. b... Sm is amplified by a predetermined amplification factor and supplied to amplifiers 27a, 27b... 27m, respectively.
[0053]
Next, the light emission control operation according to the first embodiment by the data line driving circuit 3 and the scanning line driving circuit 5 will be described with reference to the timing chart shown in FIG. 5 shows a light emission control operation for controlling the light emission of the uppermost light emitting polymers 14a, 14b,..., 14m among the light emission control operations for causing each light emitting polymer 14 in FIG. 4 to emit light. is there. Further, in FIG. 5, reference numerals 6a, 6b, and 6m indicate temporal changes in voltage in the parasitic capacitances of the data lines 6a, 6b, and 6m, respectively, and reference numerals 14a, 14b, and 14m respectively indicate the light emitting polymer 14a, The time change of the voltage applied to 14b and 14m is shown.
[0054]
First, the image signal Ssig having the waveform shown in the seventh row from the bottom in FIG. 5 (analog signal. In the case shown in the seventh row from the bottom in FIG.₁, Sg₂... At the timing of outputting Sgn (hereinafter, this period is referred to as the first frame), an image signal Ssig (a control signal Ssw described later) for causing only the light emitting polymers 14a and 14m to emit light.₁And Sswm. ) And the next scanning signal Sg₁, Sg₂... At the timing of outputting Sgn (hereinafter, this period is referred to as the second frame), an image signal Ssig (a control signal Ssw described later) for causing only the light emitting polymer 14b to emit light.₂Synchronized with. ) Is entered. ) Is input, the data line drive shift register 3 ′ controls the control signal Ssw for sampling the image signal Ssig at a predetermined timing set in advance.₁, Ssw₂... Scan signals Sg by shifting Sswm by one sampling period₁, Sg₂... output for each Sgn (see the fourth to sixth stages from the top in FIG. 5).
[0055]
As a result, the switches 22a, 22b,.₁, Ssw₂... Is turned on when Sswm becomes “HIGH”, and the input image signal Ssig for one horizontal row is sampled at each timing, so that the capacitors 25a, 25b,. In the case shown in FIG. 5, since the image signal Ssig for causing only the light emitting polymers 14a and 14m to emit light is input during the first frame period, only the corresponding capacitors 25a and 25m are used at this time. It will be charged.
[0056]
When the sampling for all the data lines 6 is completed for the image signal Ssig for one horizontal line, the latch signal Slt shown in the eighth stage from the bottom of FIG. 5 is supplied immediately thereafter, and the switches 23a, 23b,. Turn on.
[0057]
Then, the charges accumulated in the capacitors 25a, 25b,... 25m are supplied to the amplifiers 27a, 27b,... 27m and the capacitors 26a, 26b,. Is done.
[0058]
The capacitors 26a, 26b ... 26m are charged by the supplied data signals Sa, Sb ... Sm, and the amplifiers 27a, 27b ... 27m amplify the supplied data signals Sa, Sb ... Sm, and each data line. Output to 6a, 6b... 6m. As a result, the parasitic capacitance in each of the data lines 6a, 6b,..., 6m is charged (see the fourth to sixth stages from the bottom of FIG. 5). In the case shown in FIG. 5, since the image signal Ssig for causing only the light emitting polymers 14a and 14m to emit light is input during the period of the first frame, the parasitic capacitance of the data line 6a and the data line at this time are input. Only 6 m of parasitic capacitance will be charged.
[0059]
Then, after the charging of the parasitic capacitance of each data line 6a, 6b... 6m is started, the scanning signal Sg₁Is supplied to the scanning line 7a (see the top row in FIG. 5), the scanning signal Sg.₁The TFTs 13a, 13b,... 13m are simultaneously turned on only during the period in which “H” is “HIGH”. Therefore, the parasitic capacitance of the data lines 6a, 6b,. Sa, Sb... Sm are simultaneously supplied to each light emitting polymer 14a, 14b... 14m, and the light emitting polymers 14a, 14b.
[0060]
At this time, the scanning signal Sg₁After the value becomes “LOW”, the storage capacitor 15 in each pixel unit 11 is discharged, so that the light emission in each light emitting polymer 14a, 14b... 14m is continued and the light emission amount gradually decreases ( (Refer to FIG. 5 bottom to third from the bottom.) In the case shown in FIG. 5, only the light emitting polymers 14a and 14m emit light during the first frame period.
[0061]
Here, in the first embodiment, the scanning signal Sg₁Since the TFTs 13a, 13b... 13m for the uppermost row are simultaneously turned on / off, the light emitting polymers 14a, 14b... 14m (only the light emitting polymers 14a and 14m in the first frame period) emit light simultaneously. Start and end light emission at the same time. Accordingly, the light emission amount of each light emitting polymer 14a, 14b,..., 14m is proportional to the area indicated by the diagonal lines from the bottom to the second in FIG. 14a, 14b... 14m all have the same amount of light emission, and uneven brightness between the light-emitting polymers 14 included in one pixel line is eliminated.
[0062]
The scanning signal Sg₁After the signal becomes “LOW”, the scanning signal Sg for driving each TFT 13 included in the second row is displayed.₂The scanning signal Sg for driving each TFT 13 included in the third row₃Are applied by the scanning line driving circuit 5 while sequentially shifting the timing (see the second to third stages from the top in FIG. 5).
[0063]
Thereafter, the above-described operation is repeated to control the light emission timing and light emission amount of each light emitting polymer 14.
[0064]
Next, in FIG. 5, the image signal Ssig for causing only the light emitting polymer 14b to emit light is input in the period of the second frame, and in this case, the above-described case corresponding to the period of the second frame is input. Of the operations, only the operations of the switches 22b and 23b, the capacitors 25b and 26b, and the 8 amplifier 27b corresponding to the data line 6b contribute to the light emission.
[0065]
As a result, only the light emitting polymer 14b emits light. In this case, if the amplitudes of the pulses of the image signal Ssig shown in FIG. 5 are all the same, the light emission amount of the light emitting polymer 14b is also equal to the light emission amount of the previous light emitting polymer 14a or 14m (FIG. 5). (Refer to the shaded portion on the second row from the bottom of 5)
As described above, according to the operations of the data line driving circuit 3 and the scanning line driving circuit 5 of the first embodiment, the plurality of write emitting polymers 14 arranged in a matrix are line-sequentially driven for each row. Therefore, the application of the data signals Sa, Sb,... Sm is started simultaneously with each light emitting polymer 14 and the application is simultaneously ended. As a result, the amount of current supplied to each light emitting polymer 14 is reduced. Since they are equal to each other, it is possible to prevent the occurrence of luminance unevenness in the entire display device 1 as compared with the case where each light emitting polymer 14 is driven in a dot sequential manner.
[0066]
Further, since the TFT 13 is formed in each pixel portion 11 to cause each light emitting polymer 14 to emit light, a high-definition image can be displayed.
[0067]
Further, since each TFT 13 is made of polysilicon, the driving capability does not deteriorate even if a large current for driving each light emitting polymer 14 flows for a long period of time.
[0068]
Furthermore, since the light emitting polymer 14a connected to the data line 6a is caused to emit light by the capacitors 25a and 26a and the switches 22a and 23a, for example, each light emitting polymer 14 can be efficiently driven in a line sequential manner. .
[0069]
Furthermore, since the light-emitting type light emitting polymer 14 is used, a high-luminance image can be obtained as the display device 1.
[0070]
(II)Second embodiment of display device
Next, the configuration and operation of the data line driving circuit according to the second embodiment which is another embodiment of the present invention will be described with reference to FIG. In FIG. 6, the same members as those in the first embodiment are denoted by the same member numbers, and detailed description thereof is omitted.
[0071]
In the first embodiment described above, the case where the image signal Ssig is an analog signal has been described. In the second embodiment, the image signal Ssig input from the outside via the mounting terminal 9 is, for example, a 3-bit digital signal. The case where it is is demonstrated. In this embodiment, 3 bits are described as an example, but the present invention is not limited to this.
[0072]
As shown in FIG. 6, the data line driving circuit 3 </ b> A of the second embodiment includes a shift register 30, switches 34 and 35, a first latch circuit 31, a second latch circuit 32, and one data line 6. And a D / A converter 33 provided in the circuit.
[0073]
The first latch circuit 31 includes a latch circuit 31A, a latch circuit 31B, and a latch circuit 31C corresponding to each bit in the image signal Ssig.
[0074]
Further, the second latch circuit 32 includes a latch circuit 32A, a latch circuit 32B, and a latch circuit 32C corresponding to each bit in the image signal Ssig.
[0075]
Next, the operation will be described.
[0076]
The switch 35 and the first latch circuit 31 sample the 3-bit image signal Ssig input from the outside based on the control of the shift register 20.
[0077]
Next, the switch 34 transfers the sampled image signal Ssig for each bit to the respective latch circuits 32A to 32C in the second latch circuit 22 at the timing indicated by the latch signal Slt input from the outside. .
[0078]
The second latch circuit 32 simultaneously outputs the transferred digital image signal Sg for each bit for each data line 6 at the timing of line-sequentially driving the write emitting polymer 14 in each pixel unit 11. / A output to the converter 33.
[0079]
Next, each D / A converter 33 converts the input image signal Ssig to an analog data signal having a current value corresponding to the digital value indicated by the image signal Ssig for each data line 6. And supplied to each data line 6.
[0080]
After that, the scanning signal Sg supplied by the scanning line 7₁, Sg₂The data signals are simultaneously supplied to the respective light emitting polymers 14 through the TFTs 13 driven by the like, and each light emitting polymer 14 emits light with a light emission amount corresponding to the digital value indicated by the image signal Ssig. It becomes.
[0081]
According to the operation of the data line driving circuit 3A of the second embodiment described above, even if the input image signal Ssig is a digital signal, the same effect as in the first embodiment can be obtained, and there is no luminance unevenness. A high-definition image can be displayed.
[0082]
In the above embodiment, the case where the light emitting polymer 14 is used as the light emitting element has been described. However, in the present invention, other than this, a current driven light emitting element such as an organic or inorganic EL (ElectroLuminescence) element is used. The present invention can be widely applied to the used display device.
[0083]
(III)Embodiment of electronic device
Next, embodiments of various electronic devices using the display device 1 according to the above-described embodiment will be described with reference to FIGS.
[0084]
An electronic apparatus configured using the display device 1 includes a display information output source 1000, a display information processing circuit 1002, a display drive circuit 1004, a display panel 1006, a clock generation circuit 1008, and a power supply circuit 1010 shown in FIG. Consists of.
[0085]
Among these, the display information output source 1000 includes a memory such as a ROM (Read Only Memory) and a RAM (Random Access Memory), a tuning circuit that tunes and outputs a television signal, and the like. Based on the clock signal, display information such as a video signal is output.
[0086]
The display information processing circuit 1002 processes display information based on the clock signal from the clock generation circuit 1008 and outputs it. The display information processing circuit 1002 can include, for example, an amplification / polarity inversion circuit, a phase expansion circuit, a rotation circuit, or a clamp circuit.
[0087]
Next, the display driving circuit 1004 includes a scanning line driving circuit and a data line driving circuit, and drives the display panel 1006 for display.
[0088]
The power supply circuit 1010 supplies power to each circuit described above.
[0089]
Examples of the electronic apparatus having the above-described configuration include a multimedia-compatible personal computer (PC) and engineering work station (EWS) shown in FIG. 8, a pager shown in FIG. 9, and other examples include a mobile phone, Examples thereof include a word processor, a television, a viewfinder type or a monitor direct-view type video tape recorder, an electronic notebook, an electronic desk calculator, a car navigation device, a POS terminal, and a device equipped with a touch panel.
[0090]
A personal computer 1200 shown in FIG. 8 includes a main body 1204 provided with a keyboard 1202 and a display unit 1206 including the display device of the present invention.
[0091]
【The invention's effect】
As described above, according to the present invention, the current-driven light-emitting means is driven line-sequentially, so that a high-definition image with no luminance unevenness can be displayed over the entire display device.
[Brief description of the drawings]
FIG. 1 is a plan view showing an overall configuration of a display device.
FIG. 2 is a plan view illustrating a specific configuration of a pixel portion.
FIG. 3 is an equivalent circuit of a pixel portion.
FIG. 4 is a block diagram illustrating a configuration of a data line driving circuit and the like according to the first embodiment.
FIG. 5 is a timing chart showing the operation of the data line driving circuit and the like of the first embodiment.
FIG. 6 is a block diagram illustrating a configuration of a data line driving circuit and the like according to a second embodiment.
FIG. 7 is a block diagram illustrating a schematic configuration of an electronic device.
FIG. 8 is a front view showing an external appearance of a personal computer.
[Explanation of symbols]
1. Display device
2 ... Display section
3. Data line drive circuit
3 '... Data line drive shift register
4 ... Inspection circuit
5. Scanning line drive circuit
6, 6a, 6b, 6m ... data lines
7, 7a, 7b, 7n ... scanning lines
8 ... Capacity line
9 ... Mounting terminal
10 ... Transparent substrate
11: Pixel part
12 ... Pixel electrode
13, 13a, 13b, 13m ... TFT
14, 14a, 14b, 14m ... Light emitting polymer
15, 15a, 15b, 15m ... storage capacity
20: Image signal line
21 ... Latch signal line
22a, 22b, 22m, 23a, 23b, 23m, 34, 35 ... switch
24a, 24b, 24m ... control signal line
25a, 25b, 25m, 26a, 26b, 26m ... capacitors
27a, 27b, 27m ... amplifier
30: Shift register
31. First latch circuit
31A, 31B, 31C, 32A, 32B, 32C ... latch circuit
32. Second latch circuit
33 ... D / A converter
G ... Gate electrode
D ... Drain electrode
S ... Source electrode
Ssig: Image signal
Sa, Sb, Sm ... Data signal
Slt ... Latch signal
Sg₁, Sg₂, Sgm: Scanning signal
Ssw₁, Ssw₂, Sswm ... control signal

Claims (6)

A plurality of thin-film current-driven light-emitting means each included in a plurality of pixel portions formed in a matrix on a substrate, and a drive means for driving each of the light-emitting means in a line-sequential manner. In the characteristic display device,
A plurality of scanning lines provided for each pixel row and supplied with scanning signals corresponding to display information to be displayed;
A plurality of data lines which are provided for each pixel column so as to intersect the scanning lines and to which data signals corresponding to the display information are respectively supplied;
Provided for each pixel portion and connected to the scanning line, the data line, and the light emitting means in each pixel portion, and emits the data signal corresponding to the scanning signal supplied from the scanning line. A plurality of drive switching means for driving the light emitting means by supplying to the means,
The light emitting means is organic electroluminescence, and one end of the organic electroluminescence and storage capacitor is connected to the drive switching means, respectively, and the other end of the organic electroluminescence and storage capacity is commonly used at a predetermined fixed potential. A display device that is connected . 2. The display device according to claim 1, wherein the driving means is provided for each of the pixel columns, and includes a plurality of first switching means for activating the supply of the data signal to the storage means, and each of the first switching means. A plurality of storage means for storing the supplied data signals connected to each other, and a plurality of the drive switching means connected to each of the storage means, respectively, at a timing corresponding to the display information. And a plurality of second switching means for supplying to the display at the same time . The display device according to claim 1, wherein the driving unit includes:
A shift register;
A first switch and a first latch circuit for sampling an externally input digital image signal based on the control of the shift register;
A second switch for transferring the sampled digital image signal at a timing of a latch signal input from the outside;
A second latch circuit for simultaneously outputting the transferred digital image signal for each data line;
2. The display device according to claim 1 , further comprising a D / A converter that converts a digital image signal output from the second latch circuit into an analog data signal and supplies the analog data signal to each data line . 4. The display device according to claim 1, wherein the drive switching means for driving the light emitting means is a thin film transistor formed of polysilicon. apparatus.  5. The display device according to claim 1, wherein each of the light emitting means is a light emitting polymer. 6. An electronic apparatus comprising the display device according to any one of claims 1 to 5.

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