CN112602148B - Display driving method and display device - Google Patents
Display driving method and display device Download PDFInfo
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- CN112602148B CN112602148B CN201880094118.1A CN201880094118A CN112602148B CN 112602148 B CN112602148 B CN 112602148B CN 201880094118 A CN201880094118 A CN 201880094118A CN 112602148 B CN112602148 B CN 112602148B
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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]
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Abstract
The invention discloses a display driving method and a display device, wherein the driving method comprises the following steps: acquiring gray scale voltage information (101) of each pixel in a target frame picture; controlling and adjusting the number of channels for transmitting the driving voltage according to the gray scale voltage information of each pixel in the target frame picture, wherein the number of channels represents the input impedance (102) for transmitting the driving voltage; and outputting the driving voltage to the display panel according to the adjusted channel number, wherein the gray scale voltage and the driving voltage are matched to drive the display panel to display the target frame picture (102). The number of transmission channels of the driving voltage is adjusted according to the gray scale voltage information, so that the accuracy of picture transmission is effectively ensured, and the display effect is improved.
Description
Technical Field
The present invention relates to the field of display driving technologies, and in particular, to a display driving method and a display device.
Background
Fig. 1 shows a conventional transmission method of driving Voltage (ELVDD) of an Organic Light-Emitting Diode (OLED) display Device. The ELVDD is multiplexed out of plane after being generated with a voltage by a Power driver 5(Power IC), is transmitted from near to far in a direction in which the Power line 6 is arranged by the Power driver 5, and then drives the organic light emitting diode to emit light in cooperation with a data voltage Vdata of the corresponding image data transmitted by the data line 7 to perform image display.
However, in the actual operation process of such a driving scheme, there is a phenomenon of uneven brightness, and especially, the brightness of the display area adjacent to the power driver 5 is higher than that of the display area far away from the power driver 5, so that the image displayed by the display panel is not good, and the visual experience of the user is affected.
Disclosure of Invention
In order to solve the above problem, an embodiment of the present invention discloses a display device capable of improving a display effect and a display driving method thereof.
A display driving method of a display device, comprising the steps of:
acquiring gray scale voltage information of each pixel in a target frame picture;
controlling and adjusting the number of channels for transmitting the driving voltage according to the gray scale voltage information of each pixel in the target frame picture, wherein the number of the channels represents the input impedance for transmitting the driving voltage; and
and outputting the driving voltage to a display panel according to the adjusted channel number, wherein the gray scale voltage and the driving voltage are matched to drive the display panel to display the target frame picture.
A display device comprises a display panel, a first driver and a second driver, wherein the first driver is used for obtaining gray scale voltage information of each pixel in a target frame picture and feeding the gray scale voltage information back to the second driver, the second driver is used for controlling and adjusting the number of channels for transmitting driving voltage according to the gray scale voltage information of each pixel in the target frame picture, and the number of channels represents the input impedance of the driving voltage; the second driver outputs the driving voltage to the display panel through the adjusted channel number, and the gray scale voltage provided by the first driver and the driving voltage provided by the second driver are matched to drive the display panel to display the target frame picture.
According to the display device and the display driving method provided by the embodiment of the invention, the transmission mode of the driving voltage is adjusted according to the gray scale voltage information, the accuracy of picture transmission is effectively ensured, the consistency of voltage drops generated by an external circuit of the display panel when different pictures are transmitted is also ensured, and the display effect is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a conventional OLED display device.
Fig. 2 is a schematic diagram of a display device according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a distribution of gray scale voltage information of each pixel in a target frame obtained by the first driver.
Fig. 4 is a block diagram of the output voltage control circuit.
FIG. 5 is a distribution diagram of gain values corresponding to gray scale voltages.
FIG. 6 is a diagram illustrating a transmission mode of driving voltages.
Fig. 7 is a flowchart of a display driving method of a display device according to an embodiment of the present invention.
Fig. 8 is a flowchart of step 102 shown in fig. 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, a display device 100 is provided according to an embodiment of the invention. The display device 100 includes a display panel 10, a first driver 20, and a second driver 40. The first driver 20 and the second driver 40 are both electrically connected to the display panel 10 to drive the display panel 10 to display images. The first driver 20 is provided to the circuit board 60. The second driver 40 is electrically connected to the display panel 10 and the first driver 20 through the circuit board 60. In the present embodiment, the circuit board 60 is a flexible wiring board.
The display panel 10 includes a display area 11 and a non-display area 13 disposed around the display area 11. The display panel 10 has a plurality of pixels (not shown) arranged in an array in the display region 11.
In the present embodiment, the first driver 20 is a data driver. The first driver 20 is disposed in the non-display region 13 of the display panel 10. It is understood that in other embodiments, the first driver 20 may not be provided on the display panel 10. The first driver 20 is configured to obtain gray scale voltage information of each pixel in a target frame and feed the gray scale voltage information back to the second driver 40. Please refer to fig. 3, which is a distribution diagram of gray scale voltage information of each pixel in a target frame. The second driver 40 is used for providing a driving Voltage (ELVDD) to the display panel 10 to drive the display panel 10 to display. The second driver 40 includes an output voltage control circuit 41 for controlling and adjusting the number of channels for transmitting the driving voltage according to the gray scale voltage information of each pixel in the target frame. The number of channels characterizes an input impedance that transmits the drive voltage. The more channels, the more resistors connected in parallel, namely the input impedance for transmitting the driving voltage is reduced; the smaller the number of channels, the smaller the number of resistors connected in parallel, i.e., the larger the input impedance for transmitting the driving voltage.
Referring to fig. 4, the output voltage control circuit 41 includes a processing module 411 and a control module 413.
The processing module 411 is configured to calculate a target gain value of the target frame according to gray scale voltage information of each pixel in the target frame.
Please refer to fig. 5, which is a distribution diagram of the gain values corresponding to the gray scale voltages. The Gray scale voltage (Gray) is sequentially represented as Gray scale voltage 0, Gray scale voltage 1, and Gray scale voltage 2 … …, wherein the Gain value (Gain, G) of Gray scale voltage 0 is 0, the Gain value of Gray scale voltage 128 is 1, and the Gain value of Gray scale voltage 255 is 2.
In this embodiment, let the gray scale voltage of one of the pixels be n, and the gain value G of the gray scale voltage n be 2n/255, where n is greater than or equal to 1 and less than or equal to 255. And summing the gain values corresponding to the gray scale voltages of the pixels of the target frame picture and calculating an average gain value, wherein the average gain value is the target gain value G1 of the target frame picture. The larger n is, the larger the gain value corresponding to the gray-scale voltage n is. It will be appreciated that the gain value may be set as desired. The magnitude of the average gain value may reflect the magnitude of the current value of the target frame picture. For the target frame picture with larger average gain value, the current value of the corresponding target frame picture is larger; for the target frame picture with smaller average gain value, the corresponding current value of the target frame picture is smaller.
The control module 413 controls and adjusts the number of channels for transmitting the driving voltage according to the target gain value. The initial number of channels (channels) of the drive voltage is CH0, and the adjusted number of channels is CH 1. The control module 413 multiplies the initial channel number CH0 of the driving voltage by the target gain value G1 to obtain the adjusted channel number CH1, where CH1 is CH0 × G1.
A first end of the circuit board 60 is fixed on the display panel 10, the first driver 20 is fixed on the first end of the circuit board 60, and a second end of the circuit board 60 is electrically connected to the second driver 40.
Referring to fig. 6, a schematic diagram of transmission of driving voltages in this embodiment is shown, and fig. 6 is correspondingly provided with 6 channels for transmitting driving voltages.
For the target frame picture with larger average gain value, the corresponding current value is larger, and the number of the adjusted channels is larger; for the target frame picture with smaller average gain value, the corresponding current value is smaller, and the number of the adjusted channels is smaller.
The control module 413 further outputs the driving voltage to the display panel 10 according to the adjusted channel number, so as to drive the display panel 10 to display the target frame.
When a target frame image needs to be displayed, the first driver 20 obtains gray scale voltage information of each pixel in the target frame image and feeds the gray scale voltage information back to the second driver 40. The second driver 40 controls and adjusts the number of channels for transmitting the driving voltage according to the gray scale voltage information of each pixel in the target frame. The second driver 40 outputs the driving voltage to the display panel 10 through the adjusted channel number CH1, and the gray scale voltage provided by the first driver 20 and the driving voltage provided by the second driver 40 cooperate to drive the display panel 10 to display the target frame.
The larger the average gain value of the target frame picture is, the more the number of channels of the driving voltage is adjusted, namely, the number of parallel resistors is increased, so that the impedance can be reduced, and the voltage drop can be reduced. On the contrary, the larger the average gain value of the target frame picture is, the smaller the number of channels of the driving voltage is adjusted, that is, the smaller the number of parallel resistors is, so that the impedance can be increased and the voltage drop can be increased. According to the gray scale voltage information of the target frame picture, the number of channels of the driving voltage is flexibly adjusted, and the consistency of voltage drop when different pictures are displayed is effectively ensured.
Referring to fig. 7, an embodiment of the invention further provides a display driving method, including the following steps:
And step 102, controlling and adjusting the number of channels for transmitting the driving voltage according to the gray scale voltage information of each pixel in the target frame picture. The number of channels characterizes an input impedance that transmits the drive voltage.
In this embodiment, referring to fig. 8, step 102 specifically includes the following steps:
and 1021, calculating a target gain value of the target frame picture according to the gray scale voltage information.
The Gray scale voltage (Gray) is sequentially represented as Gray scale voltage 0, Gray scale voltage 1, and Gray scale voltage 2 … …, wherein the Gain value (Gain, G) of Gray scale voltage 0 is 0, the Gain value of Gray scale voltage 128 is 1, and the Gain value of Gray scale voltage 255 is 2. The magnitude of the gain value reflects the magnitude of the current value of the target frame picture. In this embodiment, let the gray scale voltage of one of the pixels be n, and the gain value G of the gray scale voltage n be 2n/255, where n is greater than or equal to 1 and less than or equal to 255. And summing the gain values of all pixels of the target frame picture and calculating an average value, wherein the average value is the target gain value G1 of the target frame picture. The larger n is, the larger the gain value corresponding to the gray-scale voltage n is. It will be appreciated that the gain value may be set as desired.
The initial number of channels (channels) of the driving voltage is set to CH0, and the adjusted number of channels is set to CH 1. CH1 multiplies the initial channel number CH0 of the driving voltage by the target gain value G1 to obtain the adjusted channel number CH1, CH1 ═ CH0 × G1. For the target frame picture with larger average gain value, the larger the corresponding current value is, the larger the adjusted channel number CH1 is; the smaller the average gain value is, the smaller the corresponding current value is, the smaller the adjusted channel number CH1 is.
And 103, outputting the driving voltage to a display panel according to the adjusted channel number, wherein the gray scale voltage and the driving voltage are matched to drive the display panel to display the target frame picture.
The display device and the display driving method provided by the embodiment of the invention adjust the number of channels of the driving voltage according to the gray scale voltage information, thereby effectively ensuring the accuracy of picture transmission and also ensuring the consistency of voltage drops generated by external circuits of the display panel 10 when different pictures are transmitted. Because the driving voltage has the same voltage drop (IR drop) at each gray scale, the driving voltage of the organic light-emitting end of the display panel is ensured to be consistent, namely the source voltage (Vs) is consistent, thereby ensuring the accurate display of a monochromatic picture and improving the display effect. In addition, because the consistency of the driving voltage is ensured, the voltage drop is not changed when the Gamma (Gamma) debugging operation is carried out on the display panel, and the deviation of the picture display cannot occur.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A display driving method of a display device, comprising:
acquiring gray scale voltage information of each pixel in a target frame picture;
calculating to obtain a target gain value of the target frame picture according to the gray scale voltage information of each pixel in the target frame picture;
controlling and adjusting the number of channels for transmitting the driving voltage according to the target gain value, wherein the number of channels represents the input impedance for transmitting the driving voltage;
and
and outputting the driving voltage to a display panel according to the adjusted channel number, wherein the gray scale voltage and the driving voltage are matched to drive the display panel to display the target frame picture.
2. The method as claimed in claim 1, wherein the calculating a target gain value of the target frame according to the gray scale voltage information of each pixel in the target frame comprises: setting the gray scale voltage of one pixel as n, setting the gain value of the gray scale voltage n as 2n/255, and setting the gain value of the gray scale voltage n to be not less than 1 and not more than 255, summing the gain values corresponding to the gray scale voltage of each pixel of the target frame picture and calculating an average value, wherein the average value is the target gain value of the target frame picture.
3. The method for driving a display device according to claim 2, wherein the controlling and adjusting the number of channels for transmitting the driving voltage according to the target gain value comprises: and multiplying the initial channel number of the driving voltage with the target gain value to obtain the adjusted channel number.
4. A display device is characterized by comprising a display panel, a first driver and a second driver, wherein the first driver is used for obtaining gray scale voltage information of each pixel in a target frame picture and feeding the gray scale voltage information back to the second driver, the second driver comprises an output voltage control circuit, the output voltage control circuit comprises a processing module and a control module, the processing module calculates a target gain value of the target frame picture according to the gray scale voltage information of each pixel in the target frame picture, the control module controls and adjusts the number of channels for transmitting driving voltage according to the target gain value, and the number of channels represents the input impedance of the driving voltage; the control module further outputs the driving voltage to the display panel according to the adjusted channel number, and the gray scale voltage provided by the first driver and the driving voltage provided by the second driver cooperate to drive the display panel to display the target frame picture.
5. The display device according to claim 4, wherein the gray scale voltage of one pixel is n, the gain value of the gray scale voltage n is 2n/255, n is greater than or equal to 1 and less than or equal to 255, the processing module sums up the gain values corresponding to the gray scale voltages of the pixels of the target frame picture and calculates an average value, and the average value is the target gain value of the target frame picture.
6. The display device of claim 5, wherein the control module multiplies an initial channel number of the driving voltage by the target gain value to obtain the adjusted channel number, and the control module outputs the driving voltage to the display panel according to the adjusted channel number.
7. The display device of claim 4, further comprising a circuit board electrically connected to the display panel, the first driver, and the second driver.
8. The display device as claimed in claim 7, wherein the first end of the circuit board is fixed on the display panel, the first driver is fixed on the first end of the circuit board, and the second end of the circuit board is electrically connected to the second driver.
9. The display device according to claim 7, wherein the display panel includes a display area and a non-display area disposed around the display area, and the first driver is disposed in the non-display area of the display panel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/107617 WO2020061817A1 (en) | 2018-09-26 | 2018-09-26 | Display driving method and display device |
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| CN112602148A CN112602148A (en) | 2021-04-02 |
| CN112602148B true CN112602148B (en) | 2022-08-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100670136B1 (en) * | 2004-10-08 | 2007-01-16 | 삼성에스디아이 주식회사 | Data driver and light emitting display using the same |
| US7310074B2 (en) * | 2004-11-24 | 2007-12-18 | Artled Technology Corp. | System for controlling LED devices |
| US20090278774A1 (en) * | 2008-05-06 | 2009-11-12 | Shing-Chia Chen | Content-adaptive adjustment system and method |
| CN101794551A (en) * | 2010-02-04 | 2010-08-04 | 友达光电股份有限公司 | Method for improving image brightness in OLED display panel |
| CN104036721B (en) * | 2014-05-15 | 2017-01-18 | 京东方科技集团股份有限公司 | Organic-light-emitting-diode display panel, and driving method and display device thereof |
| CN104036727B (en) * | 2014-06-04 | 2015-07-01 | 京东方科技集团股份有限公司 | DC driving voltage regulation device and method, power supply device and display panel |
| US20180254004A1 (en) * | 2017-03-06 | 2018-09-06 | Novatek Microelectronics Corp. | Integrated circuit for driving display panel and fan-out compensation method thereof |
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| WO2020061817A1 (en) | 2020-04-02 |
| CN112602148A (en) | 2021-04-02 |
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