CN114495843B - Pixel TFT charge-discharge panel circuit structure - Google Patents
Pixel TFT charge-discharge panel circuit structure Download PDFInfo
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- CN114495843B CN114495843B CN202210083019.1A CN202210083019A CN114495843B CN 114495843 B CN114495843 B CN 114495843B CN 202210083019 A CN202210083019 A CN 202210083019A CN 114495843 B CN114495843 B CN 114495843B
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3433—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 by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—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 by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The invention provides a pixel TFT charge-discharge panel circuit structure, which relates to the technical field of display screens and comprises a pixel substrate, an isolated gate driver and a flexible circuit board; the pixel substrate is provided with a plurality of pixel units which are arranged in an array manner, and the isolated gate driver and the flexible circuit board are respectively connected with the plurality of pixel units; the pixel unit comprises a first transistor, a second transistor and a storage capacitor; and a precharge circuit is arranged on a connecting line between the transversely adjacent scanning lines, and when the first nodes of the scanning lines and the connecting lines are opened, the second nodes of the scanning lines and the connecting lines are opened unidirectionally for performing precharge actions. The invention can precharge in advance through the TFT backboard circuit, and solves the problems of uneven display and yin-yang screen caused by insufficient charge and discharge in the screen brushing process of the electronic paper.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a pixel TFT charge-discharge panel circuit structure.
Background
The electronic paper ink screen display has the characteristics of ultra-low power consumption, low frequency display and electricity saving, and has wide application markets in price tags, education flat plates and bus stop boards.
The display driving principle is that each scanning line sequentially sends an opening signal to a row of TFTs, and when the TFTs are conducted, the data lines charge storage capacitors of pixels through the conducted TFTs to write a gray scale voltage. After the TFT is turned off, the gray scale voltage is maintained by the storage capacitor until the next time the TFT controlling the pixel is turned on. The scanning lines sequentially turn on the TFTs on each row, and then the gray scale voltages of the pixels are updated by the data lines, so that the scanning lines continuously and circularly act to update the picture. Wherein the scan lines are wired to the IC with the left and right sides, and the IC provides waveforms for opening and closing. Each frame refresh process is first discharged and recharged. However, the existing product is completed in the same time pulse in the whole charge-discharge process, which is easy to cause insufficient charge-discharge in the pixels, and further causes the problem of uneven display.
Disclosure of Invention
The invention solves the problems of uneven display and yin-yang screen caused by insufficient charge and discharge in the screen brushing process of electronic paper by pre-charging in advance through a TFT backboard circuit.
In order to solve the above problems, the present invention provides a pixel TFT charge-discharge panel circuit structure, comprising: a pixel substrate, an isolated gate driver, and a flexible circuit board;
the pixel substrate is provided with a plurality of pixel units which are arranged in an array manner, and the isolated gate driver and the flexible circuit board are respectively connected with the plurality of pixel units;
the pixel unit comprises a first transistor, a second transistor and a storage capacitor; the base electrodes of the first transistor and the second transistor are connected to a scanning line, a plurality of pixel units are connected in series to the scanning line, the emitter electrode of the first transistor is connected with a data line, the collector electrode of the first transistor is connected with the emitter electrode of the second transistor, the collector electrode of the second transistor is connected with the anode electrode of the storage capacitor, and the cathode electrode of the storage capacitor is grounded;
a precharge circuit is arranged on a connecting line between the transversely adjacent scanning lines, and when a first node of the scanning lines and the connecting line is opened, a second node of the scanning lines and the connecting line is opened unidirectionally for performing precharge action; the scanning lines are connected with the isolated gate driver through the connecting lines, and the pixel units are connected with the flexible circuit board through COM lines.
In the structure, the scanning line driving signals are provided by the isolated gate driver, the progressive charging and discharging processes are carried out in the same time, and the TFT backboard precharge circuit is added to precharge in advance, so that the problems of cathode-anode screen, uneven display and the like of the electronic paper caused by insufficient charging and discharging in the screen brushing process are effectively solved.
Further, the precharge circuit includes a first unidirectional conduction diode and a second unidirectional conduction diode, wherein an anode of the first unidirectional conduction diode and an anode of the second unidirectional conduction diode are connected in parallel on the connection line, a cathode of the first unidirectional conduction diode is connected with one pixel unit, and a cathode of the second unidirectional conduction diode is connected with the other pixel unit.
In the structure, the adjacent scanning lines are performed by the unidirectional diode, when the first node of the scanning line is started, the second node is simultaneously opened unidirectionally, the precharge is performed, and when the scanning line is performed to the second node, the charge of the pixels can be recharged, so that the charge of the pixels is fully charged, and the charge of the pixels is improved.
Further, the precharge circuit includes a first unidirectional conduction diode, a second unidirectional conduction diode, and a third transistor; the positive electrode of the first unidirectional conduction diode is connected with the base electrode of the third transistor in parallel on the connecting line, the negative electrode of the first unidirectional conduction diode is connected with the collector electrode of the third transistor and one pixel unit in parallel, and the emitter electrode of the third transistor is connected with the other pixel unit in series through the second unidirectional conduction diode.
In the structure, the phenomenon that the TFT switching characteristic is poor due to the difference of the TFT process characteristics, and the connection lines connected with the scanning lines at left and right sides are conducted is prevented from causing abnormal display.
Further, bases of the first transistor and the second transistor are connected to bases of the first transistor and the second transistor of other pixel units on the scanning line of the same row.
Further, an emitter of the first transistor is connected to an emitter of the first transistor of the other pixel units on the data line of the same column.
Further, the first transistor and the second transistor of the pixel unit of the same row are controlled by the scan line of the previous row.
Further, the isolated gate driver is respectively connected with the pixel units in parallel through the scanning lines.
Further, the flexible circuit board is respectively connected with the pixel units in parallel through the data lines.
Further, the first transistor and the second transistor are PNP transistors, respectively.
Further, the third transistor is an NPN transistor.
The technical scheme adopted by the invention has the following beneficial effects:
according to the invention, the precharge circuit is designed in the pixel substrate to precharge the pixels, so that the time of a charging process is saved, and the pixel charge is more easily filled, thereby improving the problem of uneven display caused by uneven charging and discharging.
Drawings
Fig. 1 is a schematic circuit diagram of a charge-discharge panel of a pixel TFT according to a first embodiment and a second embodiment of the present invention;
fig. 2 is a schematic diagram of a precharge circuit of a circuit structure of a pixel TFT charge-discharge panel according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a precharge circuit of a circuit structure of a pixel TFT charge-discharge panel according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a reverse scan circuit in a precharge circuit of a pixel TFT charge-discharge panel circuit structure according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a reverse scan circuit in a precharge circuit of a pixel TFT charge-discharge panel circuit structure according to a first embodiment of the present invention;
reference numerals illustrate:
1-pixel unit, 101-first transistor, 102-second transistor, 103-storage capacitor, 104-third transistor, 2-scan line, 3-data line, 4-connecting line, 5-first node, 6-second node, D1-first unidirectional conduction diode, D2-second unidirectional conduction diode.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example 1
The embodiment provides a pixel TFT charge-discharge panel circuit structure, as shown in fig. 1 and 2, comprising a pixel substrate, an isolated gate driver and a flexible circuit board;
a plurality of pixel units 1 arranged in an array are arranged on the pixel substrate, and the isolated gate driver and the flexible circuit board are respectively connected with the plurality of pixel units 1;
the pixel unit 1 includes a first transistor 101, a second transistor 102, and a storage capacitor 103; the bases of the first transistor 101 and the second transistor 102 are connected to the scanning line 2, a plurality of pixel units 1 are connected in series to the scanning line 2, the emitter of the first transistor 101 is connected with the data line 3, the collector of the first transistor 101 is connected with the emitter of the second transistor 102, the collector of the second transistor 102 is connected with the anode of the storage capacitor 103, and the cathode of the storage capacitor 103 is grounded;
a precharge circuit is arranged on the connecting line 4 between the transversely adjacent scanning lines 2, and when the first nodes 5 of the scanning lines 2 and the connecting line 4 are opened, the second nodes 6 of the scanning lines 2 and the connecting line 4 are opened unidirectionally for performing precharge operation; the scanning line 2 is connected to the isolated gate driver via a connection line 4, and the plurality of pixel units 1 are connected to the flexible circuit board via COM lines.
Specifically, the drive signals of the scanning lines 2 are provided by the isolated gate driver, the progressive charging and discharging processes are carried out in the same time, the TFT backboard precharge circuit is added to precharge in advance, and the problems of yin-yang screen, uneven display and the like of the electronic paper caused by insufficient charging and discharging in the screen brushing process are effectively solved.
The precharge circuit includes a first unidirectional conduction diode D1 and a second unidirectional conduction diode D2, wherein an anode of the first unidirectional conduction diode D1 and an anode of the second unidirectional conduction diode D2 are connected in parallel on the connection line 4, a cathode of the first unidirectional conduction diode D1 is connected with one pixel unit 1, and a cathode D2 of the second unidirectional conduction diode is connected with the other pixel unit 1.
Specifically, adjacent scan lines 2 are connected by unidirectional diodes, when the first node 5 of the scan line 2 is turned on, the second node 6 is also turned on unidirectionally at the same time, and precharge is performed, and when the scan line 2 goes to the second node 6, the charge of the pixel is realized, so that the charge of the pixel is improved.
The bases of the first transistor 101 and the second transistor 102 are connected with the bases of the first transistor 101 and the second transistor 102 of other pixel units 1 on the scanning line 2 in the same row.
The emitter of the first transistor 101 is connected to the emitter of the first transistor 101 of the other pixel units 1 on the data line 3 of the same column.
Wherein the first transistor 101 and the second transistor 102 of the pixel unit 1 of the same row are controlled by the scanning line 2 of the previous row.
Wherein, the isolated gate driver is respectively connected with the plurality of pixel units 1 in parallel through the scanning lines 2.
Wherein the flexible circuit board is respectively connected with the pixel units 1 in parallel through the data lines 3.
Wherein the first transistor 101 and the second transistor 102 are PNP transistors, respectively.
Referring to fig. 4 and 5, in the reverse scan circuit design, that is, the scan signal is scanned from bottom to top, when the first node 5 of the scan line 2 is turned on, the second node 6 of the scan line is also turned on unidirectionally at the same time to perform the precharge, and when the scan line is turned on to the second node 6, the charge of the pixel is realized, so that the charge of the pixel is improved.
According to the invention, the precharge circuit is designed in the pixel substrate to precharge the pixels, so that the time of a charging process is saved, and the pixel charge is more easily filled, thereby improving the problem of uneven display caused by uneven charging and discharging.
Example two
The embodiment provides a pixel TFT charge-discharge panel circuit structure, as shown in fig. 1 and 3, comprising a pixel substrate, an isolated gate driver and a flexible circuit board;
a plurality of pixel units 1 arranged in an array are arranged on the pixel substrate, and the isolated gate driver and the flexible circuit board are respectively connected with the plurality of pixel units 1;
the pixel unit 1 includes a first transistor 101, a second transistor 102, and a storage capacitor 103; the bases of the first transistor 101 and the second transistor 102 are connected to the scanning line 2, a plurality of pixel units 1 are connected in series to the scanning line 2, the emitter of the first transistor 101 is connected with the data line 3, the collector of the first transistor 101 is connected with the emitter of the second transistor 102, the collector of the second transistor 102 is connected with the anode of the storage capacitor 103, and the cathode of the storage capacitor 103 is grounded;
a precharge circuit is arranged on the connecting line 4 between the transversely adjacent scanning lines 2, and when the first nodes 5 of the scanning lines 2 and the connecting line 4 are opened, the second nodes 6 of the scanning lines 2 and the connecting line 4 are opened unidirectionally for performing precharge operation; the scanning line 2 is connected to the isolated gate driver via a connection line 4, and the plurality of pixel units 1 are connected to the flexible circuit board via COM lines.
Specifically, the drive signals of the scanning lines 2 are provided by the isolated gate driver, the progressive charging and discharging processes are carried out in the same time, the TFT backboard precharge circuit is added to precharge in advance, and the problems of yin-yang screen, uneven display and the like of the electronic paper caused by insufficient charging and discharging in the screen brushing process are effectively solved.
Wherein the precharge circuit comprises a first unidirectional conduction diode D1, a second unidirectional conduction diode D2, and a third transistor 104; the positive electrode of the first unidirectional conduction diode D1 is connected in parallel with the base electrode of the third transistor 104 on the connecting line 4, the negative electrode of the first unidirectional conduction diode D1 is connected in parallel with the collector electrode of the third transistor 104 and one pixel unit 1, and the emitter electrode of the third transistor 104 is connected in series with the other pixel unit 1 through the second unidirectional conduction diode D2.
Specifically, the display abnormality caused by the conduction phenomenon of the connecting line 4 connected with the scanning line 2 from left to right due to the poor switching characteristic of the TFT caused by the difference of the process characteristics of the TFT is prevented.
The third transistor 104 is an NPN transistor.
According to the invention, the precharge circuit is designed in the pixel substrate to precharge the pixels, so that the time of a charging process is saved, and the pixel charge is more easily filled, thereby improving the problem of uneven display caused by uneven charging and discharging.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (9)
1. A pixel TFT charge-discharge panel circuit structure, comprising: a pixel substrate, an isolated gate driver, and a flexible circuit board;
the pixel substrate is provided with a plurality of pixel units (1) which are arranged in an array manner, and the isolated gate driver and the flexible circuit board are respectively connected with the plurality of pixel units (1);
the pixel unit (1) comprises a first transistor (101), a second transistor (102) and a storage capacitor (103); the base electrodes of the first transistor (101) and the second transistor (102) are connected to a scanning line (2), a plurality of pixel units (1) are connected in series to the scanning line (2), the emitter electrode of the first transistor (101) is connected with a data line (3), the collector electrode of the first transistor (101) is connected with the emitter electrode of the second transistor (102), the collector electrode of the second transistor (102) is connected with the anode of the storage capacitor (103), and the cathode of the storage capacitor (103) is grounded;
a precharge circuit is arranged on a connecting line (4) between the transversely adjacent scanning lines (2), and when a first node (5) between the scanning lines (2) and the connecting line (4) is opened, a second node (6) between the scanning lines (2) and the connecting line (4) is opened unidirectionally for performing precharge action; the scanning lines (2) are connected with the isolated gate driver through the connecting lines (4), and the pixel units (1) are connected with the flexible circuit board through COM lines;
the precharge circuit comprises a first unidirectional conduction diode (D1) and a second unidirectional conduction diode (D2), wherein the positive electrode of the first unidirectional conduction diode (D1) and the positive electrode of the second unidirectional conduction diode (D2) are connected in parallel on the connecting wire (4), the negative electrode of the first unidirectional conduction diode (D1) is connected with one pixel unit (1), and the negative electrode (D2) of the second unidirectional conduction diode is connected with the other pixel unit (1).
2. A pixel TFT charge and discharge panel circuit structure according to claim 1, wherein the bases of the first transistor (101) and the second transistor (102) are connected to the bases of the first transistor (101) and the second transistor (102) of the other pixel cells (1) on the scanning line (2) of the same row.
3. A pixel TFT charge and discharge panel circuit arrangement according to claim 1, characterized in that the emitter of the first transistor (101) is connected to the emitter of the first transistor (101) of the other pixel cells (1) on the same column of the data line (3).
4. A pixel TFT charge and discharge panel circuit arrangement according to claim 1, characterized in that the first transistor (101) and the second transistor (102) of the pixel cell (1) of the same row are controlled by the scan line (2) of the previous row.
5. The pixel TFT charge-discharge panel circuit structure of claim 1, wherein the isolated gate driver is connected in parallel with a plurality of the pixel cells (1) through the scan lines (2), respectively.
6. A pixel TFT charge and discharge panel circuit structure as claimed in claim 1, wherein said flexible circuit board is connected in parallel with a plurality of said pixel cells (1) respectively via said data lines (3).
7. The pixel TFT charge and discharge panel circuit structure according to claim 1, wherein the first transistor (101) and the second transistor (102) each employ PNP transistors.
8. A pixel TFT charge-discharge panel circuit structure, comprising: a pixel substrate, an isolated gate driver, and a flexible circuit board;
the pixel substrate is provided with a plurality of pixel units (1) which are arranged in an array manner, and the isolated gate driver and the flexible circuit board are respectively connected with the plurality of pixel units (1);
the pixel unit (1) comprises a first transistor (101), a second transistor (102) and a storage capacitor (103); the base electrodes of the first transistor (101) and the second transistor (102) are connected to a scanning line (2), a plurality of pixel units (1) are connected in series to the scanning line (2), the emitter electrode of the first transistor (101) is connected with a data line (3), the collector electrode of the first transistor (101) is connected with the emitter electrode of the second transistor (102), the collector electrode of the second transistor (102) is connected with the anode of the storage capacitor (103), and the cathode of the storage capacitor (103) is grounded;
a precharge circuit is arranged on a connecting line (4) between the transversely adjacent scanning lines (2), and when a first node (5) between the scanning lines (2) and the connecting line (4) is opened, a second node (6) between the scanning lines (2) and the connecting line (4) is opened unidirectionally for performing precharge action; the scanning lines (2) are connected with the isolated gate driver through the connecting lines (4), and the pixel units (1) are connected with the flexible circuit board through COM lines;
the precharge circuit includes a first unidirectional conduction diode (D1), a second unidirectional conduction diode (D2), and a third transistor (104); the positive electrode of the first unidirectional conduction diode (D1) is connected with the base electrode of the third transistor (104) in parallel on the connecting wire (4), the negative electrode of the first unidirectional conduction diode (D1) is connected with the collector electrode of the third transistor (104) and one pixel unit (1) in parallel, and the emitter electrode of the third transistor (104) is connected with the other pixel unit (1) in series through the second unidirectional conduction diode (D2).
9. The pixel TFT charge and discharge panel circuit structure of claim 8, wherein the third transistor (104) is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210083019.1A CN114495843B (en) | 2022-01-25 | 2022-01-25 | Pixel TFT charge-discharge panel circuit structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210083019.1A CN114495843B (en) | 2022-01-25 | 2022-01-25 | Pixel TFT charge-discharge panel circuit structure |
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| CN114495843A CN114495843A (en) | 2022-05-13 |
| CN114495843B true CN114495843B (en) | 2023-09-08 |
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| CN202210083019.1A Active CN114495843B (en) | 2022-01-25 | 2022-01-25 | Pixel TFT charge-discharge panel circuit structure |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323025A (en) * | 2000-05-09 | 2001-11-21 | 夏普公司 | Data signal wire driving circuit, image display apparatus and electronic equipment |
| CN1912980A (en) * | 2005-08-12 | 2007-02-14 | 株式会社半导体能源研究所 | Semiconductor device, display device and electronic device equipped with the semiconductor device |
| CN101789442A (en) * | 2009-01-26 | 2010-07-28 | 精工爱普生株式会社 | Light-emitting device and driving method thereof and electronic equipment |
| CN102956194A (en) * | 2011-08-23 | 2013-03-06 | 索尼公司 | Display device and electronic apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100913303B1 (en) * | 2003-05-06 | 2009-08-26 | 삼성전자주식회사 | Liquid crystal display apparatus |
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- 2022-01-25 CN CN202210083019.1A patent/CN114495843B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323025A (en) * | 2000-05-09 | 2001-11-21 | 夏普公司 | Data signal wire driving circuit, image display apparatus and electronic equipment |
| CN1912980A (en) * | 2005-08-12 | 2007-02-14 | 株式会社半导体能源研究所 | Semiconductor device, display device and electronic device equipped with the semiconductor device |
| CN101789442A (en) * | 2009-01-26 | 2010-07-28 | 精工爱普生株式会社 | Light-emitting device and driving method thereof and electronic equipment |
| CN102956194A (en) * | 2011-08-23 | 2013-03-06 | 索尼公司 | Display device and electronic apparatus |
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