CN101944323B - Organic light emitting display device, pixel unit thereof and touch detection method - Google Patents
Organic light emitting display device, pixel unit thereof and touch detection method Download PDFInfo
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Abstract
An organic light emitting display device, a pixel unit thereof and a touch detection method. The pixel unit of the organic light emitting display device includes: the organic light emitting diode display device comprises data lines, power lines, gate lines, a switching transistor, a driving transistor, an organic light emitting diode, a storage capacitor, a reading switching unit and a signal reading line, wherein the gate lines comprise a current row of gate lines and a previous row of gate lines. The switching transistor is controlled by the grid line of the row and stores the data signal of the data line into the storage capacitor. The driving transistor is driven by the storage capacitor and supplies a driving current to the organic light emitting diode. The reading switch unit is controlled by a previous row of grid lines and reads the voltage value of the storage capacitor to the signal reading line. By adopting the pixel unit, the touch screen can be integrated with the organic light-emitting display device, so that the integration level is improved, the cost is reduced, and a lighter, thinner and more compact structure is realized.
Description
Technical field
The present invention relates to the demonstration field, particularly organic light-emitting display device and pixel cell thereof, touch detecting method.
Background technology
Organic light-emitting display device (OLED, Organic Light-Emitting Display) becomes one of panel display apparatus with the fastest developing speed gradually with advantages such as its light, thin, bright in luster, wide visual angle, high-contrasts.Organic light-emitting display device utilizes luminous organic material to show image, changes brightness according to the electric current that is applied thereto (voltage) size, to realize the demonstration of different GTGs.
Organic light-emitting display device comprises a plurality of pixel cells, Fig. 1 has shown the circuit structure diagram of the pixel cell of existing a kind of organic light-emitting display device, comprising: data line 201, power lead 202, gate line 203, switching transistor (for example thin film transistor (TFT) TFT) 205, driving transistors (for example TFT) 206, Organic Light Emitting Diode 208 and memory capacitance 100.When grid drive gate line 203, switching transistor 205 is opened, and the data-signal on the data line 201 is stored to memory capacitance 100 by switching transistor 205, namely memory capacitance 100 is charged, and the magnitude of voltage of charging is determined by data-signal; Memory capacitance 100 is come the storage data signal in the mode of voltage, and makes driving transistors 206 conductings; Driving transistors 206 is coupled to power lead 202 and Organic Light Emitting Diode 208, driven by the voltage of memory capacitance 100, to provide drive current to Organic Light Emitting Diode 208; Organic Light Emitting Diode 208 receives drive current and sends luminous energy, and the luminance brightness that Organic Light Emitting Diode 208 sends depends on the size of drive current.
Touch-screen is as a kind of interface of user interactive, generally be independent of organic light-emitting display device, organic light-emitting display device with touch function can be then touch-screen separately to be made with organic light emitting display be produced on by the mode of assembling, certainly will increase like this thickness of organic light-emitting display device, owing to having increased some layers of clear glass or film, display transparent rate and contrast also can obviously descend.And it is complicated that this way forms technique, and cost is also higher.
Organic light emitting display is as a kind of novel display technique, and integrated touch screen can provide better user interactivity in organic light emitting display, and does not increase the volume of display screen.
Summary of the invention
The problem that the present invention solves provide a kind of organic light-emitting display device and pixel cell thereof with integrated touch screen in organic light emitting display.
For addressing the above problem, embodiment of the present invention provides a kind of pixel cell of organic light-emitting display device, comprise memory capacitance, previous row gate line, read switch unit and signal read line, described read switch unit is by previous row gate line control, and the magnitude of voltage of described memory capacitance is read to described signal read line.
Optionally, described read switch unit comprise have grid, the thin film transistor (TFT) of first utmost point and second utmost point, wherein, the grid of described thin film transistor (TFT) is coupled to the gate line of previous row, first utmost point is coupled to described memory capacitance, and second utmost point is coupled to described signal read line.
Optionally, described memory capacitance is the capacitive sensing element.
Optionally, described memory capacitance is temperature sensitive member.
For addressing the above problem, embodiment of the present invention also provides a kind of organic light-emitting display device that comprises above-mentioned pixel cell.
Optionally, described organic light-emitting display device also comprises the touch signal processing unit, and whether the magnitude of voltage that relatively prestore magnitude of voltage and described signal read line read changes according to magnitude of voltage, determines whether the described pixel cell that is read is touched.
The magnitude of voltage that signal read line read from memory capacitance when optionally, the described magnitude of voltage that prestores was former frame image scanning.
Optionally, after the described magnitude of voltage that prestores is former frame image scanning, the magnitude of voltage that expection magnitude of voltage, charge rate and the conservation rate that charges according to memory capacitance calculates.
Optionally, described organic light-emitting display device also comprises adapter unit and control module, and described touch signal processing unit is coupled to control module by described adapter unit.
For addressing the above problem, embodiment of the present invention also provides a kind of touch detecting method of organic light-emitting display device, comprising: during scanning previous row pixel cell, read the magnitude of voltage of the memory capacitance of one's own profession pixel cell; Whether relatively prestore magnitude of voltage and the described magnitude of voltage that reads change according to magnitude of voltage, determine whether the described pixel cell that is read is touched.
Compared with prior art, technique scheme with the memory capacitance in the pixel cell as the touch sensible element, utilize gate line, read switch unit and signal read line to read the magnitude of voltage of memory capacitance (being the touch sensible element), whether the voltage of detection of stored electric capacity changes can be determined whether this pixel is touched, and realizes that with this integrated touch screen is in organic light emitting display.Than existing organic light emitting display and touch-screen are fitted together, the organic light-emitting display device of above-mentioned integrated touch screen can not increase the thickness of display screen, and does not affect transmittance and the contrast of demonstration.
The structure that above-mentioned memory capacitance and touch sensible element share can realize touch function, thereby improve integrated level when making organic light-emitting display device, reduced cost, has realized lighter, thinner and compact structure more.And, utilize existing gate line control read switch unit that the magnitude of voltage of memory capacitance is read to signal read line, so that it is simple and reliable to touch detection.Therefore, above-mentioned organic light-emitting display device can be widely used in the portable set.
Description of drawings
Fig. 1 is the electrical block diagram of the pixel cell of existing a kind of organic light-emitting display device;
Fig. 2 is the embodiment schematic diagram of the display screen of organic light-emitting display device of the present invention;
Fig. 3 is the layout structure schematic diagram of the pixel cell of embodiment of the invention organic light-emitting display device;
Fig. 4 is the electrical block diagram of two pixel cells of adjacent two row in the organic light-emitting display device of the embodiment of the invention;
Fig. 5 is the structural representation of memory capacitance of the pixel cell of embodiment of the invention organic light-emitting display device;
Fig. 6 is the partial structurtes schematic diagram of embodiment of the invention organic light-emitting display device;
Fig. 7 is the equivalent circuit diagram of structure shown in Figure 6;
Fig. 8 is the structural representation of the driver element of embodiment of the invention organic light-emitting display device.
Embodiment
The organic light-emitting display device of embodiment of the present invention with the memory capacitance in the pixel cell as the touch sensible element, change in voltage by detection of stored electric capacity (being the touch sensible element) determines whether this pixel is touched, and realizes that with this integrated touch screen is in organic light emitting display.
The pixel cell of the organic light-emitting display device of embodiment of the present invention, comprise data line, power lead, gate line, switching transistor, driving transistors, Organic Light Emitting Diode, memory capacitance, read switch unit and signal read line, wherein, described gate line comprises one's own profession gate line and previous row gate line.Described switching transistor is by one's own profession gate line control, and the data-signal of described data line is stored to described memory capacitance.Described driving transistors is driven by described memory capacitance, provides drive current to described Organic Light Emitting Diode.Described read switch unit is by previous row gate line control, and the magnitude of voltage of described memory capacitance is read to described signal read line.
The organic light-emitting display device of embodiment of the present invention comprises a plurality of above-mentioned pixel cells.In actual applications, the display screen of organic light-emitting display device comprises MxN pixel, M is line number, N is columns, accordingly, organic light-emitting display device comprises MxN pixel cell, please refer to Fig. 2, the display screen of the organic light-emitting display device of integrated touch screen comprises effective coverage 10 (whether needs detect touch) and the inactive area 11 (do not need to detect whether touch is arranged) of touch location, wherein, the structure of the pixel cell that the pixel in the effective coverage 10 of touch location is corresponding such as the pixel cell of above-mentioned embodiment of the present invention, and can be as shown in Figure 1 in the structure of pixel cell corresponding to the pixel of the inactive area 11 of touch location.For example, effective coverage 10 can be the icon of expression user instruction, and the user touches described icon with the input user instruction by finger or pointer.
Embodiments of the present invention are described in detail below in conjunction with drawings and Examples.
Fig. 3 is the layout structure schematic diagram of a pixel cell of the organic light-emitting display device of the present embodiment.Fig. 4 is the electrical block diagram of two pixel cells of adjacent two row in the organic light-emitting display device of the present embodiment.The equivalent electrical circuit of pixel cell shown in Figure 3 is a pixel cell (pixel cell P that for example i is capable such as Fig. 4
iOr the capable pixel cell P of i+1
I+1) shown in.
The pixel cell P that i is capable
iComprise: data line 201, power lead 202, one's own profession gate line 203, previous row gate line 203a, signal read line 204, switching transistor 205, driving transistors 206, read switch unit (the present embodiment is for reading transistor 207, for example TFT), Organic Light Emitting Diode 208 (being the viewing area) and memory capacitance 100.
The pixel cell P that i+1 is capable
I+1Comprise: data line 201, power lead 202, one's own profession gate line 203b, previous row gate line 203, signal read line 204, switching transistor 205b, driving transistors 206b, read switch unit (the present embodiment is for reading transistor 207b, for example TFT), Organic Light Emitting Diode 208b and memory capacitance 100b.
The pixel cell P that i is capable
iOr the capable pixel cell P of i+1
I+1Structure identical, in conjunction with Fig. 3 and 4, with the capable pixel cell P of i
iBe example, the annexation of each element and signal wire in the pixel cell of organic light-emitting display device of the present embodiment is described.
The grid of switching transistor 205 is coupled to the first pole plate that gate line 203, the first utmost points and second utmost point are coupled to respectively data line 201 and memory capacitance 100.
The grid of driving transistors 206 is coupled to the first pole plate of memory capacitance 100, and the second pole plate and power lead 202, the second utmost points that first utmost point is coupled to memory capacitance 100 are coupled to Organic Light Emitting Diode 208.
The grid that reads transistor 207 is coupled to previous row gate line 203a, and first utmost point and second utmost point are coupled to respectively the first pole plate of signal read line 204 and memory capacitance 100.
The structure of the memory capacitance 100 of the present embodiment can be for example shown in Figure 5, comprises successively from top to bottom the first pole plate 102, insulation course 103 and the second pole plate 104.The material of insulation course can be silicon nitride or silicon dioxide etc., and the present embodiment does not limit the structure of memory capacitance 100.
In addition, the present embodiment memory capacitance 100 is simultaneously as the touch sensible element, because the restriction of this structure, memory capacitance 100 should be near the top glass substrate of organic light-emitting display device, so that can finger sensing or the touch of pointer, therefore the organic light-emitting display device of the present embodiment is end emission-type, for example the partial structurtes of the organic light-emitting display device of emission-type of a kind of end shown in Figure 6 comprise top glass substrate 101, the first pole plate 102, insulation course 103 and the second pole plate 104 successively under upper.
The equivalent electrical circuit of structure shown in Figure 6 as shown in Figure 7, resistance R is line resistance, capacitor C
StMemory capacitance, capacitor C
fBe to touch the coupling capacitance that produces, illustrate that in conjunction with Fig. 6 and 7 touch of the present embodiment detects principle: when finger 20 does not have touch display screen, be equivalent to K switch and open, the output voltage V that detects
OutBe memory capacitance C
StVoltage; When finger 20 touch display screens, be equivalent to the K switch closure, memory capacitance C
StWith coupling capacitance C
fCarry out dividing potential drop, the output voltage V that detects
OutCompare when opening with K switch and can change.For instance, establish the output voltage V of finger 20 when not having touch display screen
Out=V
Out1, voltage source V
p=15V, memory capacitance C
St=0.2pF, coupling capacitance C
f=0.5pF, therefore, the change in voltage Δ V=V before and after the finger touch
Out1-C
St* V
p/ (C
St+ C
f)=V
Out1-4.3V.
Need to prove, the present embodiment memory capacitance 100 is the capacitive sensing element, when touch is arranged, is equivalent to memory capacitance and coupling capacitance and carries out dividing potential drop.In other embodiments, memory capacitance 100 also can be temperature sensitive member, for example, the material of insulation course 103 can be thermally sensitive material, when finger touch is arranged, the temperature of memory capacitance 100 can change, and the voltage of memory capacitance 100 can vary with temperature and change, so the change in voltage of detection of stored electric capacity 100 (being detection signal read line 204) can determine also whether this pixel is touched.
The present embodiment organic light-emitting display device comprises MxN pixel cell, and M is line number, and N is columns, wherein, and i and i+1 capable (j of 1＜i＜M) row (structure of the pixel cell of 1＜j＜N) such as the pixel cell P of Fig. 4
i, P
I+1Shown in, pixel cell P
i, P
I+1Corresponding pixel is positioned at the effective coverage of the touch location of display screen.In addition, the structure that is positioned at pixel cell corresponding to the pixel of inactive area of touch location of display screen as shown in Figure 1.
Whether the present embodiment organic light-emitting display device also comprises the touch signal processing unit, for detection of the voltage on the signal read line, be touched with the pixel cell of determining to be read.Wherein, voltage on the detection signal read line is that prestore magnitude of voltage and signal read line are compared from the magnitude of voltage that memory capacitance reads, if magnitude of voltage changes (magnitude of voltage that reads is different from the magnitude of voltage that prestores), determine that then the pixel cell that is read is touched.The touch signal processing unit can obtain the touching position information of display screen according to the pixel cell that is touched that detects.
The magnitude of voltage that signal read line read from memory capacitance when the magnitude of voltage that prestores of touch signal processing unit can be former frame image scanning.The comparison of the magnitude of voltage of two frames before and after the magnitude of voltage that reads from memory capacitance during with former frame image scanning and the current magnitude of voltage that reads of signal read line compare and be equivalent to, therefore, this touch detects the demonstration that can be applied to still image.
After the magnitude of voltage that prestores of touch signal processing unit also can be former frame image scanning, to the memory capacitance charging, according to the theoretical voltage value of the expection magnitude of voltage that charges, charge rate and conservation rate calculating.Usually, the restriction that made by technique, data-signal charges to memory capacitance by data line and unlikely reaches the magnitude of voltage of expection, and after manufacture craft is finished (element and circuit structure are determined rear), charge rate (can be expressed as the actual charge value of memory capacitance and the ratio of expection magnitude of voltage) and conservation rate (can be expressed as memory capacitance and remain to the magnitude of voltage of postamble and the ratio of actual charge value) are to obtain according to the technological parameter of element and circuit, therefore can be according to the expection magnitude of voltage of charging, charge rate and conservation rate calculate the theoretical voltage value before memory capacitance is read.It is the equal of the comparison of the first magnitude of voltage with postamble of frame in the frame that the theoretical voltage value calculated and the current magnitude of voltage that reads of signal read line are compared, and therefore, this touch detection can be applied to the demonstration of dynamic image.
The touch signal processing unit can be integrated in organic light-emitting display device, also can be the integrated circuit (IC) that is independent of organic light-emitting display device.In the present embodiment, the touch signal processing unit is integrated in the driver element of organic light-emitting display device, and is for example shown in Figure 8, and driver element 30 comprises: grid driver element 300, data-driven unit 303 and touch signal processing unit 304.
Data-driven unit 303 provides data-signal to the data line of pixel cell.
Touch signal processing unit 304 compares prestore magnitude of voltage and signal read line 204 from the magnitude of voltage that memory capacitance 100 reads, if magnitude of voltage changes, determine that then the pixel cell that is read is touched, to obtain touching position information.
Principle of work below in conjunction with Fig. 4 and 8 summary the present embodiment organic light-emitting display devices:
When one's own profession grid drive one's own profession gate line, the switching transistor conducting of one's own profession pixel cell, the next line pixel cell read transistor turns, for example: the capable grid of i that provide when grid driver element 300 drive signal (for example being pulse signal) the capable pixel cell P of driving capable gate line 203, the i of i
iSwitching transistor 205 conductings, the capable pixel cell P of i+1 simultaneously
I+1Read transistor 207b conducting.To the capable pixel cell P of i
i Memory capacitance 100 charging the time read the capable pixel cell P of i+1
I+1The magnitude of voltage of memory capacitance 100b, this magnitude of voltage is the capable pixel cell P of i+1
I+1not yet the charge magnitude of voltage of front preservation of memory capacitance 100b.
The below is to determine the capable pixel cell P of i
iWhether be touched and be specifically described for example.
When showing the former frame image, scan i capable, the capable grid drive of i gate line 203, switching transistor 205 conductings, the data-signal that data-driven unit 303 offers data line 201 is stored to memory capacitance 100 by switching transistor 205, namely memory capacitance 100 is charged, the expection magnitude of voltage of charging is determined by data-signal; Memory capacitance 100 is come the storage data signal in the mode of voltage, and makes driving transistors 206 conductings; Driving transistors 206 is driven by the voltage of memory capacitance 100, provides drive current to Organic Light Emitting Diode 208; Organic Light Emitting Diode 208 receives drive current and sends luminous energy, the luminance brightness that Organic Light Emitting Diode 208 sends (being the display brightness of pixel) depends on the size of drive current, this moment, expection magnitude of voltage, charge rate and the conservation rate according to charging calculated the theoretical voltage value, and was saved to touch signal processing unit 304.
When showing this two field picture, scan i-1 capable, the capable grid drive of i-1 gate line 203a, read transistor 207 conductings, the magnitude of voltage of memory capacitance 100 reads to signal read line 204 by reading transistor 207, the magnitude of voltage of the memory capacitance 100 that touch signal processing unit 304 reads signal read line 204 and the theoretical voltage value of aforementioned preservation compare, if magnitude of voltage is not identical, then determine pixel cell P
iCorresponding pixel is touched, and judges accordingly the ordinate of the pixel that is touched, and the horizontal ordinate of touched point can be judged by the gate line that is scanning.Certainly, the be touched positional information (for example, ordinate, horizontal ordinate) of pixel is not limited to the described method of the present embodiment.
Correspondingly, embodiment of the present invention also provides a kind of touch detecting method of organic light-emitting display device, comprising: during scanning previous row pixel cell, read the magnitude of voltage of the memory capacitance of one's own profession pixel cell; Whether relatively prestore magnitude of voltage and the described magnitude of voltage that reads change according to magnitude of voltage, determine whether the described pixel cell that is read is touched.The structure of described organic light-emitting display device and pixel cell thereof can be as previously mentioned.
The magnitude of voltage that reads from memory capacitance when wherein, the described magnitude of voltage that prestores can be former frame image scanning; Perhaps, also can be former frame image scanning after, the theoretical voltage value of calculating according to expection magnitude of voltage, charge rate and the conservation rate of memory capacitance charging.
In sum, the organic light-emitting display device of above-described embodiment and pixel cell thereof with the memory capacitance in the pixel cell as the touch sensible element, utilize gate line, read switch unit and signal read line to read the magnitude of voltage of memory capacitance (being the touch sensible element), whether the voltage of detection of stored electric capacity changes can be determined whether this pixel is touched, and realizes that with this integrated touch screen is in organic light emitting display.
The structure that above-mentioned memory capacitance and touch sensible element share can realize touch function, thereby improve integrated level when making organic light-emitting display device, reduced cost, has realized lighter, thinner and compact structure more.And, utilize existing gate line control read switch unit that the magnitude of voltage of memory capacitance is read to signal read line, so that it is simple and reliable to touch detection.Therefore, above-mentioned organic light-emitting display device can be widely used in the portable set.
Than existing organic light emitting display and touch-screen are fitted together, the organic light-emitting display device of above-mentioned integrated touch screen can not increase the thickness of display screen, and does not affect transmittance and the contrast of demonstration.
Although the present invention discloses as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art without departing from the spirit and scope of the present invention, all can make various changes or modifications, so protection scope of the present invention should be as the criterion with the claim limited range.
Claims (7)
1. the pixel cell of an organic light-emitting display device, comprise memory capacitance, it is characterized in that, also comprise: read switch unit and signal read line, described read switch unit is by previous row gate line control, and the magnitude of voltage of described memory capacitance is read to described signal read line.
2. the pixel cell of organic light-emitting display device as claimed in claim 1, it is characterized in that, described read switch unit comprise have grid, the thin film transistor (TFT) of first utmost point and second utmost point, wherein, the grid of described thin film transistor (TFT) is coupled to the gate line of previous row, first utmost point is coupled to described memory capacitance, and second utmost point is coupled to described signal read line.
3. the pixel cell of organic light-emitting display device as claimed in claim 1 is characterized in that, described memory capacitance is the capacitive sensing element.
4. the pixel cell of organic light-emitting display device as claimed in claim 1 is characterized in that, described memory capacitance is temperature sensitive member.
5. an organic light-emitting display device is characterized in that, comprises the pixel cell of each described organic light-emitting display device in the claim 1 to 4; Also comprise the touch signal processing unit, whether the magnitude of voltage that relatively prestore magnitude of voltage and described signal read line read changes according to magnitude of voltage, determines whether the described pixel cell that is read is touched; Wherein, the magnitude of voltage that signal read line read from memory capacitance when the described magnitude of voltage that prestores was former frame image scanning, after perhaps the described magnitude of voltage that prestores is former frame image scanning, the theoretical voltage value that expection magnitude of voltage, charge rate and the conservation rate that charges according to memory capacitance calculates.
6. organic light-emitting display device as claimed in claim 5 is characterized in that, also comprises adapter unit and control module, and described touch signal processing unit is coupled to control module by described adapter unit, and wherein said adapter unit is flexible card extender.
7. the touch detecting method of an organic light-emitting display device is characterized in that, comprising:
During scanning previous row pixel cell, read the magnitude of voltage of the memory capacitance of one's own profession pixel cell;
Whether relatively prestore magnitude of voltage and the described magnitude of voltage that reads change according to magnitude of voltage, determine whether the described pixel cell that is read is touched; Wherein, the magnitude of voltage that reads from memory capacitance when the described magnitude of voltage that prestores is former frame image scanning, after perhaps the described magnitude of voltage that prestores is former frame image scanning, the theoretical voltage value that expection magnitude of voltage, charge rate and the conservation rate that charges according to memory capacitance calculates.
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| CN102426816B (en) * | 2011-11-19 | 2014-04-02 | 昆山工研院新型平板显示技术中心有限公司 | Method for repairing bad display of active-matrix organic light-emitting display |
| CN103176676B (en) * | 2013-02-28 | 2015-10-14 | 合肥京东方光电科技有限公司 | A kind of touch screen touch point positioning detecting circuit, touch-screen and display device |
| TWI497368B (en) * | 2013-04-02 | 2015-08-21 | Ye Xin Technology Consulting Co Ltd | Organic electroluminescent type touch display panel |
| CN103236238B (en) * | 2013-04-26 | 2015-07-22 | 北京京东方光电科技有限公司 | Pixel unit control circuit and display device |
| CN103354078B (en) | 2013-06-26 | 2016-01-06 | 京东方科技集团股份有限公司 | Active matrix organic light-emitting diode pixel unit circuit and display panel |
| CN103354080B (en) | 2013-06-26 | 2016-04-20 | 京东方科技集团股份有限公司 | Active matrix organic light-emitting diode pixel unit circuit and display panel |
| US9459721B2 (en) | 2013-06-26 | 2016-10-04 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Active matrix organic light emitting diode pixel unit circuit, display panel and electronic product |
| CN103354079B (en) * | 2013-06-26 | 2015-04-08 | 京东方科技集团股份有限公司 | Pixel unit circuit for organic LED of active matrix, and display panel |
| CN103325343B (en) | 2013-07-01 | 2016-02-03 | 京东方科技集团股份有限公司 | The driving method of a kind of image element circuit, display device and image element circuit |
| KR102049793B1 (en) | 2013-11-15 | 2020-01-08 | 엘지디스플레이 주식회사 | Organic light emitting display device |
| CN105741748B (en) | 2016-03-04 | 2019-05-14 | 京东方科技集团股份有限公司 | A kind of display panel, display equipment and production method |
| CN106169484B (en) * | 2016-08-18 | 2019-04-26 | 上海箩箕技术有限公司 | Self-luminous array of display substrate and its application method |
| CN106328659B (en) * | 2016-08-19 | 2019-06-14 | 京东方科技集团股份有限公司 | Array substrate and preparation method thereof, display panel |
| CN110136648B (en) * | 2019-05-14 | 2020-10-16 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and OLED display panel |
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