OLED Pixel Data Compensation for Row Leakage
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Solution Overview
Problem
Organic Light Emitting Diode (OLED) displays face issues with uneven image brightness due to electric leakage in pixel drive circuits, causing deviations in pixel data stored in storage capacitors across rows, leading to abnormal display screens.
Innovation Solution
A pixel data compensation method and device that calculates a pixel compensation quantity based on a row compensation coefficient and voltage deviation for each sub-pixel, adjusting the initial pixel data to compensate for differences caused by electric leakage, ensuring consistent display across rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel data is stored in storage capacitors across multiple rows using the same initial pixel data, then the display device can operate with simple drive circuits, but electric leakage causes voltage deviations that result in uneven image brightness across rows
Solution Approach 1:
The patent applies preliminary action by calculating and applying compensation values to the pixel data before it is stored in the storage capacitors. The compensation value is determined based on the row number and stored in a lookup table, then added to the original pixel data in advance. This pre-compensation ensures that when the pixel data is later read and displayed, the brightness uniformity is maintained across all rows despite electric leakage effects during storage.
2Device complexity
If row-by-row driving method is used to simplify the drive circuit, then device complexity is reduced, but voltage deviations accumulate across rows causing display abnormalities
Solution Approach 1:
The patent implements feedback by using the row number as a feedback parameter to dynamically adjust the compensation value. The row compensation coefficient is determined based on the specific row being driven, and this compensation information is fed back into the pixel data before storage. This creates a closed-loop system where the drive circuit automatically compensates for row-specific voltage deviations, maintaining display quality consistency without increasing overall device complexity.
3Productivity
If no compensation is applied to pixel data, then the processing circuit is simpler and faster, but electric leakage causes significant voltage deviations leading to uneven brightness
Solution Approach 1:
The patent applies preliminary action by pre-calculating compensation values and storing them in a lookup table based on row numbers. During actual pixel data processing, the system simply retrieves the appropriate compensation value from the lookup table and adds it to the pixel data, rather than performing complex real-time calculations. This approach maintains high processing speed while effectively compensating for electric leakage-induced brightness non-uniformity.
Data Source
AI summary
A pixel data compensation method and device for a display device, and a display device are disclosed. The pixel data compensation method includes: obtaining, for a sub-pixel of an n-th row in a column, a pixel compensation quantity Q of the sub-pixel according to a row compensation coefficient Kn of the n-th row of sub-pixels and a voltage deviation ΔVdata corresponding to an initial pixel data Vdata of the sub-pixel; compensating the initial pixel data Vdata of the sub-pixel according to the pixel compensation quantity Q of the sub-pixel to obtain a compensated pixel data V′data of the sub-pixel, and the row compensation coefficient Kn decreases as a row number of the row in which the sub-pixel is located increases.