CN109003591B - Driving voltage control system and display device - Google Patents
Driving voltage control system and display device Download PDFInfo
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- CN109003591B CN109003591B CN201811141676.7A CN201811141676A CN109003591B CN 109003591 B CN109003591 B CN 109003591B CN 201811141676 A CN201811141676 A CN 201811141676A CN 109003591 B CN109003591 B CN 109003591B
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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
- G09G3/36—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 liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention relates to a driving voltage control system, including: the gamma voltage control module is used for controlling the gamma voltage; the time sequence control module is connected with the gamma voltage module; the time sequence control module is used for detecting the current charging area of the display panel and transmitting a voltage difference value data code corresponding to the current charging area to the gamma voltage module; the gamma voltage module is used for outputting a gamma voltage according to the voltage difference data code and the reference voltage data code so as to charge the display panel. The driving voltage control system can realize the dynamic matching charging effect on the display panel, reduce the charging difference of the display panel, avoid doubling data lines and have low cost.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving voltage control system and a display device.
Background
Along with the display screen size is bigger and bigger, the resolution is higher and higher, and when the data line charges to display panel, the difference of charging of the near end region that is close to the drive plate on the display panel and the distal region that is far away from the drive plate is more and more obvious, and the charging effect of the near end region that display panel is close to the drive plate is better, and luminance is higher, and the charging effect of the distal region that display panel is far away from the drive plate is poorer, and luminance is lower.
At present, a display screen with a larger size is charged by adopting a data line bilateral driving mode to reduce charging difference, but the data line is required to be doubled in the mode, so that the cost is high.
Disclosure of Invention
Accordingly, it is desirable to provide a driving voltage control system and a display device for solving the problems of charging difference and high cost of large-sized display panels.
A drive voltage control system, the drive voltage control system comprising:
the time sequence control module is used for detecting the current charging area of the display panel; and
a gamma voltage module connected with the time sequence control module,
the time sequence control module is also used for transmitting a voltage difference value data code corresponding to the current charging area to the gamma voltage module;
the gamma voltage module is used for outputting a gamma voltage according to the voltage difference data code and the reference voltage data code so as to charge the display panel.
In one embodiment, the timing control module includes a counter for counting a current charging area of the display panel.
In one embodiment, the timing control module further includes a control unit, and the control unit is configured to identify a numerical value counted by the counter and output a corresponding voltage difference data code according to the numerical value.
In one embodiment, the timing control module further comprises a first memory for storing the voltage difference data code.
In one embodiment, the gamma voltage module includes a second memory for storing reference voltage data codes.
In one embodiment, the gamma voltage module further includes an adder for adding the voltage difference data code and the reference voltage data code.
In one embodiment, the gamma voltage module further includes a digital-to-analog conversion unit for converting a sum of the voltage difference value data code and the reference voltage data code into an analog gamma voltage by a digital code and outputting the converted gamma voltage.
In one embodiment, the timing control module and the gamma voltage module are connected through an I2C bus.
A drive voltage control system, the drive voltage control system comprising:
the time sequence control module is used for detecting the current charging area of the display panel; and
a gamma voltage module connected with the time sequence control module,
the time sequence control module is also used for transmitting a voltage difference value data code corresponding to the current charging area to the gamma voltage module;
the gamma voltage module is used for outputting a gamma voltage according to the voltage difference data code and the reference voltage data code so as to charge the display panel;
the time sequence control module comprises a counter, a control unit and a first memory; the counter is used for counting the current charging area of the display panel; the control unit is used for identifying a numerical value obtained by counting of the counter and outputting a corresponding voltage difference data code according to the numerical value; the first memory is used for storing the voltage difference data code.
A display device comprises a driving board, a display panel, a data line and a driving voltage control system, wherein the data line is arranged at the same side of the display panel and is connected with the display panel and the driving board; the driving board is used for charging the gamma voltage output by the driving voltage control system to the display panel line by line through the data line.
Above-mentioned drive voltage control system and display device, through saving the difference value data code in time sequence control module, time sequence control module detects display panel's the current region of charging to according to the current voltage difference value data code that the regional transmission of charging corresponds to gamma voltage module that detects, gamma voltage module exports gamma voltage according to difference value data code and reference voltage data code, in order to right display panel charges, thereby reach the effect of charging to display panel dynamic matching, reduce display panel's the difference of charging, need not to increase the data line of one time more, it is with low costs.
Drawings
Fig. 1 is a connection diagram of a driving voltage control system and a display panel according to an embodiment of the invention;
FIG. 2 is a schematic block diagram of a driving voltage control system provided by an embodiment of the present invention;
FIG. 3 is a functional block diagram of a driving voltage control system according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of a driving voltage control system according to another embodiment of the present invention;
FIG. 5 is a diagram of a liquid crystal driving structure in a display panel;
FIG. 6 is a schematic diagram of the sub-pixel structure shown in FIG. 5;
fig. 7 is a schematic connection diagram of a driving board, a display panel and a data line of a display device according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the driving voltage control system includes: a timing control module 10 and a gamma voltage module 20. The timing control module 10 is connected to the gamma voltage module 20. The timing control module 10 is configured to detect a current charging area of the display panel 102, and transmit a corresponding voltage difference data code to the gamma voltage module 20 according to the detected current charging area. The gamma voltage module 20 is configured to output a gamma voltage according to the voltage difference data code and the reference voltage data code to charge the display panel 102. The display panel 102 is connected to the timing control module 10 and the gamma voltage module 20.
The timing control module 10 and the gamma voltage module 20 are connected by a serial bus. In this embodiment, the timing control module 10 and the gamma voltage module 20 are connected by an I2C (Inter-Integrated Circuit) bus. In the communication process of the I2C protocol, only two wires are needed to transmit information between devices connected to the bus, and the device has the advantages of simple structure, good flexibility and convenience in development.
Referring to fig. 7, the delta data code is a code of a difference between a gamma voltage actually output by the gamma voltage module 20 and a theoretical gamma voltage obtained by the timing control module 10 through a pre-debugging process before the embodiment of the present invention is implemented. The voltage difference value data code is set according to the display requirements of the display panel 102. The reference voltage data code is a code generating a reference gamma voltage. The driving board 101 performs progressive scanning charging on the display panel 102 through the data lines 103 by using the gamma voltage output by the gamma voltage module 20. The current charging area is an area where a currently charged row of the display panel 102 is located.
In one embodiment, the voltage difference value data code may be obtained by the timing control module 10 in real time. Obtaining the voltage difference data codes in real time can greatly reduce the storage space of the sequential control module 10.
Referring to fig. 5, fig. 5 is a schematic diagram of a liquid crystal driving structure in the display panel 102. In the liquid crystal driving structure, a plurality of sub-pixel structures are arranged in an array, a scanning signal Si (i is more than or equal to 1 and less than or equal to m) is input into each row, and a data signal Dj (j is more than or equal to 1 and less than or equal to n) is input into each column. In general, the scan signal Si is input row by row, i.e., S1 to Sm are sequentially input with a high level at a fixed period, so that the sub-pixels of the row are input with data signals. When the input of the scanning signal is finished, the display of one frame of graphics is finished. Typically, the one-frame scan time is 1/60 seconds, i.e., the refresh rate is 60 hertz.
Referring to fig. 6, fig. 6 is a schematic diagram of a sub-pixel structure. The sub-pixel structure comprises a three-terminal switching device T1, which is generally a thin film transistor, wherein a scanning signal Si is input at the grid electrode of the three-terminal switching device, a data signal Dj is input at the source electrode of the three-terminal switching device, and two capacitors Cs and Clc which are connected in parallel are connected at the drain electrode of the three-terminal switching device, wherein the capacitor Cs is an energy storage capacitor, and the capacitor Clc is a liquid crystal capacitor. The other end of the parallel capacitor may be connected to a common voltage Vcom.
When the scan signal Si is input to a high level, the thin film transistor T1 is turned on, and receives the input data signal Dj (voltage signal). The voltage difference between the data signal Dj and the common voltage Vcom charges the capacitors Cs, Clc, wherein the voltage between Clc deflects the liquid crystal molecules therein, so that the backlight transmits light of a corresponding degree according to the degree of deflection of the liquid crystal molecules, thereby making the sub-pixel present a corresponding brightness. The capacitor Cs is used to hold this voltage until the next scan comes.
The voltage of the data signal Dj may be higher than the common voltage Vcom or lower than the common voltage Vcom. When the absolute value of the voltage difference between the two is the same and the signs are opposite, the brightness displayed by the driving sub-pixels is the same. When the voltage of the data signal Dj is higher than the common voltage Vcom, it is called positive polarity driving, and otherwise, it is called negative polarity driving.
For each sub-pixel structure, it is used to drive and display one sub-pixel. For example, for a three-color pixel unit, the sub-pixels are a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B); for a four-color pixel unit, the sub-pixels are a red sub-pixel (R), a green sub-pixel (G), a blue sub-pixel (B), and a white sub-pixel (W).
Each line of area corresponds to different voltage difference data codes, and the voltage difference value corresponding to each line of area can be set according to actual needs.
Referring to fig. 2 and 3 again, in the first embodiment, the timing control module 10 includes a counter 11, a control unit 12 and a first memory 13. The counter 11 is configured to count a current charging area of the display panel 102, so that the timing control module 10 obtains a current number of charging rows of the display panel 102. In the present embodiment, the counter 11 is a line counter for counting the charged lines of the display panel 102. The counter 11 may be a binary counter, a decimal counter, or other binary counter. Each time the display panel 102 completes charging a line, the count of the counter 11 is increased by 1 accordingly.
The control unit 12 is configured to identify a numerical value counted by the counter 11 and output a corresponding voltage difference data code according to the numerical value, so that the timing control module 10 adjusts the charging voltage of the display panel 102 in real time according to the charging area of the display panel 102. In this embodiment, the control unit 12 may be a micro control unit or a single chip microcomputer. In other embodiments, the control Unit 12 may also be other chips or functional modules with data Processing capability, such as a Central Processing Unit (CPU).
The first memory 13 is used for storing the voltage difference data codes, so that the control unit 12 can call the voltage difference data codes at any time to ensure the stability of the voltage difference data codes. In this embodiment, the first memory 13 is a read-only-memory (read-only-memory), and in a normal operating state, the control unit 12 can only read data from the first memory 13 and cannot modify or rewrite data quickly. The ROM has the advantage of simple circuit structure and no data loss after power-off. The read-only memory includes mask ROM, programmable ROM, and erasable ROM.
In one embodiment, the display panel 102 is charged in 400 rows, where X is four stages: when X is less than or equal to 100, the voltage difference data code is delta V1; when X is more than 100 and less than or equal to 200, the voltage difference data code is delta V2; when 200< X ≦ 300, the voltage difference data code is Δ V3; when 300< X ≦ 400, the voltage difference value data code is Δ V4. Wherein, the delta V1< deltaV 2< deltaV 3< deltaV 4. When the charging area of the display panel 102 is X ≦ 100, the control unit 12 transmits Δ V1 to the gamma voltage module 20; when the charging area of the display panel 102 is 100< X ≦ 200, the control unit 12 transmits Δ V2 to the gamma voltage module 20; when the charging area of the display panel 102 is 200< X ≦ 300, the control unit 12 transmits Δ V3 to the gamma voltage module 20; when the charging area of the display panel 102 is 300< X ≦ 400, the control unit 12 transmits Δ V4 to the gamma voltage module 20. The Δ V1, Δ V2, Δ V3, Δ V4 are stored in the first memory 13. In practical applications, the number of rows may be graded according to the number of rows of the display panel 102 and the voltage difference data code corresponding to each step may be set as required.
The gamma voltage module 20 includes a second memory 21, an adder 22 and a digital-to-analog conversion unit 23. The second memory 21 is used for storing reference voltage data codes so that the gamma voltage module 20 can call the reference voltage data codes at any time. In this embodiment, the second memory 21 is a read-only-memory (read-only-memory), and in a normal operating state, the adder 22 can only read the reference voltage data codes from the second memory 21, and cannot modify or rewrite the reference voltage data codes quickly. Using the ROM as a memory, the circuit structure of the gamma voltage module 20 can be simplified and the reference voltage data codes are not lost after power-off.
The adder 22 is configured to add the voltage difference data code and the reference voltage data code, so that the gamma voltage module 20 can obtain the sum of the voltage difference data code and the reference voltage data code.
The digital-to-analog converting unit 23 is configured to convert the sum of the voltage difference data code and the reference voltage data code into an analog gamma voltage by a digital code and output the analog gamma voltage, so that the gamma voltage module 20 can output the analog voltage according to a digital signal. The digital-to-analog conversion unit 23 includes a weight resistor network, an operational amplifier, a reference power supply, and an analog switch. The analog switch comprises a MOS tube.
In this embodiment, the voltage difference value data codes are stored in the timing control module 10 and the reference voltage data codes are stored in the gamma voltage module 20, which is beneficial to saving the storage space of the timing control module 10.
Referring to fig. 4, in the second embodiment, the timing control module 10 includes a counter 11, a control unit 12 and a first memory 13. The counter 11 is used for counting the current charging area of the display panel 102. Each time the display panel 102 completes charging a line, the count of the counter 11 is increased by 1 accordingly. The control unit 12 is configured to identify a numerical value counted by the counter 11 and output a corresponding voltage difference data code and a reference voltage data code according to the numerical value. The first memory 13 is used for storing the voltage difference data code and the reference voltage data code.
The gamma voltage module 20 includes an adder 22 and a digital-to-analog conversion unit 23. The adder 22 is configured to add the voltage difference data code and the reference voltage data code. The digital-to-analog converting unit 23 is configured to convert the sum of the voltage difference data code and the reference voltage data code into an analog gamma voltage by a digital code and output the gamma voltage. In this embodiment, the voltage difference value data codes and the reference voltage data codes are stored in the timing control module 10, which is beneficial to saving the storage space of the gamma voltage module 20.
The invention also provides a display device, which comprises the driving voltage control system, a driving board 101, a display panel 102 and a data line 103 arranged at the same side of the display panel 102 and connected with the display panel 102 and the driving board 101. The driving board 101 is used for charging the gamma voltage output by the driving voltage control system to the display panel 102 row by row through the data line 103.
The display panel 102 of the present application may be, for example, a liquid crystal display panel, but is not limited thereto, and may also be an OLED display panel, a W-OLED display panel, a QLED display panel, a plasma display panel, a curved display panel or other types of display panels.
According to the driving voltage control system and the display device, the voltage difference value data codes are stored in the time sequence control module 10, the time sequence control module 10 detects the current charging area of the display panel 102, the corresponding voltage difference value data codes are transmitted to the gamma voltage module 20 according to the detected current charging area, and the gamma voltage module 20 outputs the gamma voltage according to the voltage difference value data codes and the reference voltage data codes, so that the charging effect of dynamically matching the display panel 102 is achieved, and the cost is low.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A drive voltage control system, characterized by comprising:
the time sequence control module is used for presetting a plurality of voltage difference value data codes and detecting the current charging area of the display panel; the display panel comprises a plurality of row areas, the row areas are divided into a plurality of steps, each voltage difference value is set corresponding to one step of the display panel, and the current charging area is a currently charged row area of the display panel; and the number of the first and second groups,
the gamma voltage module is connected with the time sequence control module, and the time sequence control module is also used for transmitting a voltage difference data code corresponding to the order of the current charging area to the gamma voltage module;
the time sequence control module comprises a counter and a control unit, wherein the counter is used for counting the current charging area of the display panel, and the control unit is used for identifying a numerical value obtained by counting by the counter and outputting a voltage difference value data code corresponding to the order of the current charging area according to the numerical value;
the gamma voltage module is used for outputting a gamma voltage according to the voltage difference data code and the reference voltage data code so as to charge the display panel.
2. The driving voltage control system according to claim 1, wherein the timing control module further comprises a first memory for storing the voltage difference data code.
3. The driving voltage control system of claim 2, wherein the gamma voltage module includes a second memory for storing reference voltage data codes.
4. The driving voltage control system of claim 3, wherein the gamma voltage module further comprises an adder for adding a voltage difference data code and a reference voltage data code.
5. The driving voltage control system according to claim 4, wherein the gamma voltage module further comprises a digital-to-analog conversion unit for converting a sum of the voltage difference data code and the reference voltage data code into an analog gamma voltage by a digital code and outputting the same.
6. The driving voltage control system according to claim 1, wherein the timing control module and the gamma voltage module are connected by a serial bus.
7. A drive voltage control system, characterized by comprising:
the time sequence control module is used for presetting a plurality of voltage difference value data codes and detecting the current charging area of the display panel; the display panel comprises a plurality of row areas, the row areas are divided into a plurality of steps, each voltage difference value is set corresponding to one step of the display panel, and the current charging area is a currently charged row area of the display panel; and the number of the first and second groups,
a gamma voltage module connected with the time sequence control module,
the time sequence control module is also used for transmitting a voltage difference value data code corresponding to the order of the current charging area to the gamma voltage module;
the gamma voltage module is used for outputting a gamma voltage according to the voltage difference data code and the reference voltage data code so as to charge the display panel;
the time sequence control module comprises a counter, a control unit and a first memory; the counter is used for counting the current charging area of the display panel; the control unit is used for identifying a numerical value obtained by counting of the counter and outputting a voltage difference value data code corresponding to the order of the current charging area according to the numerical value; the first memory is used for storing the voltage difference data code.
8. A display device, comprising a driving board, a display panel, a data line disposed on the same side of the display panel and connected to both the display panel and the driving board, and the driving voltage control system according to any one of claims 1 to 7; the driving board is used for charging the gamma voltage output by the driving voltage control system to the display panel line by line through the data line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811141676.7A CN109003591B (en) | 2018-09-28 | 2018-09-28 | Driving voltage control system and display device |
| PCT/CN2018/120850 WO2020062605A1 (en) | 2018-09-28 | 2018-12-13 | Driving voltage control system and display device |
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| CN201811141676.7A CN109003591B (en) | 2018-09-28 | 2018-09-28 | Driving voltage control system and display device |
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| CN109003591B true CN109003591B (en) | 2021-11-30 |
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| CN109559696B (en) * | 2018-12-24 | 2021-08-24 | 惠科股份有限公司 | Display module, gamma voltage adjusting method thereof and display device |
| CN114023280B (en) * | 2021-11-18 | 2022-11-08 | 深圳市华星光电半导体显示技术有限公司 | Voltage control circuit, display panel |
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| KR100477986B1 (en) * | 2002-04-12 | 2005-03-23 | 삼성에스디아이 주식회사 | An organic electroluminescent display and a driving method thereof |
| JP3715967B2 (en) * | 2002-06-26 | 2005-11-16 | キヤノン株式会社 | DRIVE DEVICE, DRIVE CIRCUIT, AND IMAGE DISPLAY DEVICE |
| CN100592371C (en) * | 2006-12-08 | 2010-02-24 | 群康科技(深圳)有限公司 | Liquid crystal display device and its driving method |
| CN102930844B (en) * | 2012-11-12 | 2016-01-06 | 京东方科技集团股份有限公司 | The control method of display device and data voltage |
| CN103413533B (en) * | 2013-07-26 | 2015-07-15 | 北京京东方光电科技有限公司 | Control circuit and display device |
| CN105590609B (en) * | 2016-03-11 | 2019-01-22 | 深圳市华星光电技术有限公司 | Driving method for liquid crystal display panel and liquid crystal display panel drive system |
| CN106297706B (en) * | 2016-09-01 | 2017-10-31 | 京东方科技集团股份有限公司 | Pixel cell, display base plate, display device, the method for driving pixel electrode |
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| WO2020062605A1 (en) | 2020-04-02 |
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