CN103943093B - Improve method and the device of passive organic light-emitting diode (OLED) display screen brightness uniformity - Google Patents
Improve method and the device of passive organic light-emitting diode (OLED) display screen brightness uniformity Download PDFInfo
- Publication number
- CN103943093B CN103943093B CN201410134903.9A CN201410134903A CN103943093B CN 103943093 B CN103943093 B CN 103943093B CN 201410134903 A CN201410134903 A CN 201410134903A CN 103943093 B CN103943093 B CN 103943093B
- Authority
- CN
- China
- Prior art keywords
- row
- master controller
- load
- pmoled
- brightness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Improve method and the device of passive organic light-emitting diode (OLED) display screen brightness uniformity, described device comprises image input interface circuit, communication interface circuit, master controller, frame memory, digital adjustable power circuit, PMOLED drive circuit.Image input interface circuit receives needs the image data transmission of display to master controller; Master controller receive view data stored in frame memory, according to often row display load calculate often row brightness correction coefficients; Main controller controls PMOLED drive circuit drives PMOLED screen display diagram picture, and when regulating often row pixel display according to every row brightness correction coefficients, numeral adjustable power circuit exports driving power voltage or pixel light emission dutycycle.The present invention effectively can improve the brightness irregularities phenomenon between row and row that PMOLED display screen causes due to each row load difference, the brightness irregularities phenomenon especially during low-light level.
Description
Technical field
The present invention relates to a kind of diode display technique, especially a kind of passive Organic Light Emitting Diode (PMOLED) display technique, specifically a kind of method and mating electrical control device improving passive organic light-emitting diode (OLED) display screen brightness uniformity.
Background technology
Organic light-emitting diode display (OLED, Organiclightemittingdisplay) technology, compared with liquid crystal display, has that visual angle is wide, contrast is high, respond the advantages such as fast.It can be divided into passive drive (PassiveMatrix, PMOLED) and active matrix driving (ActiveMatrix, AMOLED) two kinds type of drive.Wherein PMOLED adopts scan mode to light pixel in screen array, and each pixel is luminous under short pulse drives, and has the advantage that structure is simply easy to produce, and more early than AMOLED is applied.
But, in actual applications, especially under low illumination conditions, because there is stray capacitance and the impedance of pixel and cabling in PMOLED display screen, pixel quantity and the pixel gray scale of the display of PMOLED display different rows are different, namely, when the load between different rows is different, the drive current between row from row is different, and brightness there will be notable difference, thus cause display frame brightness irregularities, especially when low-light level shows, the drive current of the less row of load is too small, and its brightness situation less than normal can be aggravated.At present, except improving production technology, the main solution for this problem is to stray capacitance precharge, brightness uniformity can be improved to a certain extent, but when showing that area is large, line-scanning frequency height time, precharge time is shorter, and its improvement result obviously declines.
Summary of the invention
The object of the invention is the problem of display frame brightness irregularities under the low illumination conditions that the existing organic light-emitting diode (OLED) display screen of pin exists, invent a kind of method changing its brightness uniformity, a kind of electrical control gear matched is provided simultaneously.
One of technical scheme of the present invention is:
Improve a method for passive organic light-emitting diode (OLED) display screen brightness uniformity, it is characterized in that it comprises the following steps:
Step (1) is received the view data inputted by image input interface circuit by master controller, view data stored in frame memory, and is counted often row light emitting pixel point quantity and this row each light emitting pixel point gray scale by master controller;
Step (2) master controller is according to often row light emitting pixel point quantity and this row each light emitting pixel point densitometer calculate often row load;
Step (3) master controller is according to often row load and reference line load calculate often row brightness correction coefficients β x, x=1,2,3 ... n ..., x is line order number;
Step (4) master controller is according to current brightness level correction row brightness correction coefficients β x;
Step (5) master controller reads view data in frame memory and exports PMOLED drive circuit driving PMOLED screen display diagram picture to, and regulate the digital adjustable power circuit during display of xth row to export driving power voltage or pixel light emission dutycycle according to brightness correction coefficients β x, or regulate driving power voltage and pixel light emission dutycycle simultaneously.
Reference line load in described step (3) is the load of load maximum row, minimum row load or the load of intermediate value row.
The middle brightness correction coefficients β x of described step (3) is directly proportional to reference line load and xth row duty ratio value.
When xth row in described step (5) shows, the value of digital adjustable power circuit output driving power voltage or pixel light emission dutycycle is β x times of reference line driving power voltage or pixel light emission dutycycle.
When the load of xth row is less than reference line load in described step (4), brightness correction coefficients β x increases with screen intensity grade and reduces, and reduces and increase with screen intensity grade; When the load of xth row is greater than reference line load, brightness correction coefficients β x increases with screen intensity grade and increases, and reduces and reduce with screen intensity grade.，
Two of technical scheme of the present invention is:
A kind of electrical control gear improving passive organic light-emitting diode (OLED) display screen brightness uniformity, it is characterized in that it comprises image input interface circuit 1, master controller 2, frame memory 3, numeral adjustable power circuit 5 and PMOLED drive circuit 6, the image input of described master controller 2 is connected with the output terminal of image input interface circuit 1, frame memory 3 and master controller 2 are bi-directionally connected, the input end of numeral adjustable power circuit 4 is connected with the output terminal of master controller 2, numeral adjustable power circuit 4 is connected with the power input of PMOLED drive circuit 5 to provide PMOLED to shield required driving power, the output terminal of master controller is connected with the input end of PMOLED drive circuit 6.
Described master controller 2 is programmable logic device (PLD) or microprocessor.
Described frame memory 3 is SRAM memory.
Beneficial effect of the present invention:
Present invention can be implemented in and when PMOLED screen characteristics cannot be changed, effectively to improve PMOLED display brightness homogeneity under different size, different brightness.
The present invention effectively can improve the brightness irregularities phenomenon between row and row that PMOLED display screen causes due to each row load difference, the brightness irregularities phenomenon especially during low-light level.
Under low-light level, with 5cd/m
2for example, compared with the display screen not adopting the technology of the present invention, the present invention can improve brightness uniformity more than 50%, makes the brightness uniformity of display screen remain on more than 75%.
Accompanying drawing explanation
Fig. 1 is the structured flowchart improving PMOLED display brightness homogeneity device of the present invention.
Fig. 2 is the method flow diagram improving PMOLED display brightness homogeneity of the present invention.
Fig. 3 is the circuit structure block diagram of specific embodiments of the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
Embodiment one.
As shown in Figure 1,3.
A kind of electrical control gear improving passive organic light-emitting diode (OLED) display screen brightness uniformity, it is primarily of image input interface circuit 1, master controller 2, frame memory 3, numeral adjustable power circuit 5 and PMOLED drive circuit 6 form, the image input of described master controller 2 is connected with the output terminal of image input interface circuit 1, frame memory 3 and master controller 2 are bi-directionally connected, the input end of numeral adjustable power circuit 4 is connected with the output terminal of master controller 2, numeral adjustable power circuit 4 is connected with the power input of PMOLED drive circuit 5 to provide PMOLED to shield required driving power, the output terminal of master controller is connected with the input end of PMOLED drive circuit 6, as shown in Figure 1.Physical circuit block diagram as shown in Figure 3, using programmable logic device (CPLD) as master controller 2, image input interface circuit 1 receives the RGB parallel video signal of host computer transmission, adopt SRAM to store the parameter such as view data and brightness correction coefficients as frame memory 3, numeral adjustable (boosting) circuit 4 provides driving voltage VCC for PMOLED shields.CPLD receives the view data of input by the RGB parallel interface of image input interface, by the view data that receives stored in SRAM, add up often row light emitting pixel point quantity and this row each light emitting pixel point gray scale and also calculate often row display load, often will go display load stored in SRAM.After one frame image data receives, CPLD is according to often row display load and the load of maximum load row calculate the brightness correction coefficients of this row, and according to the monochrome information correction brightness correction coefficients that host computer sets, be specially and continue to increase along with brightness reduces brightness correction coefficients, each row brightness correction coefficients after correction is stored in SRAM.CPLD to read in SRAM often row view data and brightness correction coefficients, PMOLED screen display is driven to show each row image, and driving voltage VCC size when blanking zone control figure booster circuit of being expert at regulates each row to show according to each row brightness correction coefficients, thus realize the function improving PMOLED show uniformity.
Embodiment two.
As shown in Figure 2.
Improve a method for passive organic light-emitting diode (OLED) display screen brightness uniformity, specifically comprise the following steps:
Step (1), master controller receives the view data inputted by image input interface circuit, by view data stored in frame memory, and adds up often row light emitting pixel point quantity and this row each light emitting pixel point gray scale;
Step (2), master controller is according to often row light emitting pixel point quantity and this row each light emitting pixel point densitometer calculate often row load;
Step (3), master controller is according to often row load and reference line load calculate often row brightness correction coefficients β x, x=1,2,3 ... n ... x is line order number, and wherein reference line load can be the load of load maximum row, minimum row load or the load of intermediate value row, and brightness correction coefficients β x is directly proportional to reference line load and xth row duty ratio value;
Step (4), master controller is according to current brightness level correction row brightness correction coefficients β x, and wherein when the load of xth row is less than reference line load, brightness correction coefficients β x increases with screen intensity grade and reduces, and reduces and increase with screen intensity grade; When the load of xth row is greater than reference line load, brightness correction coefficients β x increases with screen intensity grade and increases, and reduces and reduce with screen intensity grade;
Step (5), master controller reads view data in frame memory and exports PMOLED drive circuit driving PMOLED screen display diagram picture to, and regulate the digital adjustable power circuit during display of xth row to export driving power voltage or pixel light emission dutycycle according to brightness correction coefficients β x, or regulate driving power voltage and pixel light emission dutycycle simultaneously, wherein during the display of xth row, numeral adjustable power circuit exports driving power voltage or pixel light emission dutycycle, is reference line driving power voltage or pixel light emission dutycycle β x times.
Principle of work of the present invention is: master controller calculates row load according to the often row light emitting pixel point quantity of input picture and each light emitting pixel point gray scale, and increase the brightness of low load row according to row load to be regulated and reference line load percentage relation or reduce the brightness of high capacity row, thus realize the function improving PMOLED display brightness homogeneity.Reference line load can be the load of load maximum row, minimum row load or the load of intermediate value row.Consider that the degree that brightness of display screen is uneven under different brightness is different, the present invention is according to whole-screen brightness grade correction brightness correction coefficients.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (5)
1. improve a method for passive organic light-emitting diode (OLED) display screen brightness uniformity, it is characterized in that it comprises the following steps:
Step (1) is received the view data inputted by image input interface circuit by master controller, view data stored in frame memory, and is counted often row light emitting pixel point quantity and this row each light emitting pixel point gray scale by master controller;
Step (2) master controller is according to often row light emitting pixel point quantity and this row each light emitting pixel point densitometer calculate often row load;
Step (3) master controller is according to often row load and reference line load calculate often row brightness correction coefficients β x, x=1,2,3 ... n ..., x is line order number;
Step (4) master controller is according to current brightness level correction row brightness correction coefficients β x;
Step (5) master controller reads view data in frame memory and exports PMOLED drive circuit driving PMOLED screen display diagram picture to, and regulate the digital adjustable power circuit during display of xth row to export driving power voltage or pixel light emission dutycycle according to brightness correction coefficients β x, or regulate driving power voltage and pixel light emission dutycycle simultaneously;
When the load of xth row is less than reference line load in described step (4), brightness correction coefficients β x increases with screen intensity grade and reduces, and reduces and increase with screen intensity grade; When the load of xth row is greater than reference line load, brightness correction coefficients β x increases with screen intensity grade and increases, and reduces and reduce with screen intensity grade.
2. method according to claim 1, is characterized in that the reference line load in described step (3) is the load of load maximum row, minimum row load or the load of intermediate value row.
3. method according to claim 1, is characterized in that the middle brightness correction coefficients β x of described step (3) is directly proportional to reference line load and xth row duty ratio value.
4. method according to claim 1, when it is characterized in that the xth row display in described step (5), the value of digital adjustable power circuit output driving power voltage or pixel light emission dutycycle is β x times of reference line driving power voltage or pixel light emission dutycycle.
5. the electrical control gear of method use described in a claim 1, it is characterized in that it comprises image input interface circuit (1), master controller (2), frame memory (3), numeral adjustable power circuit (5) and PMOLED drive circuit (6), the image input of described master controller (2) is connected with the output terminal of image input interface circuit (1), frame memory (3) and master controller (2) are bi-directionally connected, the input end of numeral adjustable power circuit (4) is connected with the output terminal of master controller (2), numeral adjustable power circuit (4) is connected with the power input of PMOLED drive circuit (5) to provide PMOLED to shield required driving power, the output terminal of master controller is connected with the input end of PMOLED drive circuit (6), described master controller (2) is programmable logic device (PLD) or microprocessor, described frame memory (3) is SRAM memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134903.9A CN103943093B (en) | 2014-04-04 | 2014-04-04 | Improve method and the device of passive organic light-emitting diode (OLED) display screen brightness uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134903.9A CN103943093B (en) | 2014-04-04 | 2014-04-04 | Improve method and the device of passive organic light-emitting diode (OLED) display screen brightness uniformity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103943093A CN103943093A (en) | 2014-07-23 |
| CN103943093B true CN103943093B (en) | 2016-01-20 |
Family
ID=51190730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410134903.9A Expired - Fee Related CN103943093B (en) | 2014-04-04 | 2014-04-04 | Improve method and the device of passive organic light-emitting diode (OLED) display screen brightness uniformity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103943093B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104392698A (en) * | 2014-12-17 | 2015-03-04 | 广州新视界光电科技有限公司 | LED display device and LED screen brightness uniformity regulating method |
| CN104731147B (en) * | 2015-03-19 | 2017-07-25 | 深圳市华星光电技术有限公司 | A kind of voltage output control system and voltage output system |
| CN105448228A (en) * | 2016-01-14 | 2016-03-30 | 京东方科技集团股份有限公司 | Driving signal automatic adjusting method and apparatus |
| CN106412549B (en) * | 2016-10-28 | 2018-07-20 | 京东方科技集团股份有限公司 | Brightness of image method of adjustment and device |
| CN109616040B (en) * | 2019-01-30 | 2022-05-17 | 厦门天马微电子有限公司 | Display device, driving method thereof and electronic equipment |
| CN109671392B (en) * | 2019-02-27 | 2021-11-19 | Oppo广东移动通信有限公司 | Brightness compensation method, display and computer storage medium |
| CN110223642B (en) | 2019-05-31 | 2020-07-03 | 昆山国显光电有限公司 | Picture compensation method and display device |
| CN110176211A (en) * | 2019-06-17 | 2019-08-27 | 南京国兆光电科技有限公司 | Improve the method and device of passive organic light-emitting diode (OLED) display screen brightness uniformity |
| TWI707323B (en) * | 2019-11-15 | 2020-10-11 | 大陸商北京集創北方科技股份有限公司 | LED driving device and LED display |
| CN111445859B (en) * | 2020-04-30 | 2022-02-25 | 京东方科技集团股份有限公司 | Gamma voltage debugging method and gamma voltage debugging device |
| CN111640405B (en) * | 2020-06-30 | 2022-06-28 | 京东方科技集团股份有限公司 | Liquid crystal module driving control method and device and liquid crystal display |
| CN111899690B (en) * | 2020-08-18 | 2021-10-15 | 昇显微电子(苏州)有限公司 | Method and device for improving low-brightness Mura |
| CN112261758B (en) * | 2020-11-05 | 2023-04-28 | 西安中颖电子有限公司 | Method for compensating uniformity of LED |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1760945A (en) * | 2004-08-02 | 2006-04-19 | 冲电气工业株式会社 | Display panel driving circuit and driving method |
| CN1763831A (en) * | 2004-10-20 | 2006-04-26 | 台朔光电股份有限公司 | Uniformity of luminance compensation process and circuit for display picture surface load effect |
| CN1783181A (en) * | 2004-12-03 | 2006-06-07 | 富士通日立等离子显示器股份有限公司 | Image display apparatus and driving method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI288381B (en) * | 2005-05-02 | 2007-10-11 | Chi Mei El Corp | Driving method of a dual-scan mode displayer and related display thereof |
-
2014
- 2014-04-04 CN CN201410134903.9A patent/CN103943093B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1760945A (en) * | 2004-08-02 | 2006-04-19 | 冲电气工业株式会社 | Display panel driving circuit and driving method |
| CN1763831A (en) * | 2004-10-20 | 2006-04-26 | 台朔光电股份有限公司 | Uniformity of luminance compensation process and circuit for display picture surface load effect |
| CN1783181A (en) * | 2004-12-03 | 2006-06-07 | 富士通日立等离子显示器股份有限公司 | Image display apparatus and driving method thereof |
Non-Patent Citations (1)
| Title |
|---|
| OLED驱动控制电路的研究;刘辉;《万方学位论文》;20060531;第55页第2段至第57页第1行 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103943093A (en) | 2014-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103943093B (en) | Improve method and the device of passive organic light-emitting diode (OLED) display screen brightness uniformity | |
| CN107068048B (en) | The digital driving method of OLED display | |
| KR102542856B1 (en) | Display apparatus and control method thereof | |
| US10255852B2 (en) | Comparator unit, display, and method of driving display | |
| CN105070248B (en) | Improve the OLED drive systems and driving method of picture contrast | |
| CN104978926A (en) | Pixel control circuit | |
| CN106847180B (en) | The luminance compensation system and luminance compensation method of OLED display | |
| CN105989794B (en) | OLED display | |
| CN110070803B (en) | Pixel driving circuit and display device | |
| EP1158483A2 (en) | Solid-state display with reference pixel | |
| CN104103233A (en) | Display apparatus | |
| CN104464626A (en) | Organic electroluminescence display device and method | |
| CN105679242A (en) | Pixel circuit and driving method thereof | |
| CN103177693A (en) | Organic light emitting diode display device and driving method thereof | |
| CN102714020A (en) | System and method for power conservation for AMOLED pixel drivers | |
| CN104392698A (en) | LED display device and LED screen brightness uniformity regulating method | |
| CN105788531A (en) | Driving circuit of OLED (Organic Light Emitting Diode) display panel | |
| KR20170028623A (en) | Image Display Apparatus and Driving Method Thereof | |
| CN103854600A (en) | Organic light emitting diode display and method for driving the same | |
| CN105047139A (en) | Digital driving method for OLED display device | |
| CN108538253B (en) | The pixel driver system and driving method of displayer | |
| CN103021316B (en) | A kind of drive system and method being applicable to RGBW tetra-sub-pixels display screen | |
| CN101261806B (en) | Display apparatus and method for driving the same | |
| CN105118435A (en) | Self-light-emitting display and self-light-emitting display method | |
| KR102210589B1 (en) | Organic light emitting display panel and organic light emitting display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20170404 |