Display Panel Voltage Compensation for Luminance Uniformity
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Solution Overview
Problem
Luminance non-uniformity in organic light emitting diode displays occurs due to varying voltage drops across subpixels depending on their two-dimensional position, leading to degraded image quality.
Innovation Solution
A display device and driving method that compensates for data voltage by applying different compensation gains based on the position of subpixels in both horizontal and vertical directions, considering voltage drops due to resistance components and image data patterns, to enhance luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If driving voltage is supplied through driving voltage lines to subpixels, then the display panel can operate and emit light, but voltage drop occurs depending on the two-dimensional position of subpixels, causing luminance non-uniformity
Solution Approach 1:
The patent applies different compensation gains to different regions of the display panel based on their two-dimensional positions. Specifically, it divides the display panel into multiple regions (e.g., first region, second region, third region, fourth region) and assigns different compensation gain values to each region to counteract the position-dependent voltage drops. This local differentiation approach ensures that each region receives appropriate voltage compensation tailored to its specific electrical characteristics, thereby achieving uniform luminance across the entire display panel.
Solution Approach 2:
The patent changes the compensation gain parameter based on the two-dimensional position of subpixels and the pattern of input image data. By dynamically adjusting the compensation gain according to position coordinates (e.g., horizontal position, vertical position) and image content characteristics, the system optimizes voltage compensation for each specific condition, effectively counteracting the voltage drop variations and achieving consistent luminance output across different regions.
2Illumination intensity
If position-based compensation is applied to all subpixels, then luminance uniformity improves, but calculation complexity and processing time increase
Solution Approach 1:
The patent segments the display panel into multiple discrete regions (e.g., first region, second region, third region, fourth region) based on their two-dimensional positions relative to data driving circuits. By dividing the continuous compensation problem into discrete regional segments, the system simplifies the calculation process while maintaining compensation effectiveness. Each region is assigned a specific compensation gain value, reducing the overall computational complexity compared to continuous position-based calculations.
Solution Approach 2:
The patent applies compensation primarily to specific regions where voltage drop is most significant (e.g., regions farther from data driving circuits), rather than uniformly compensating all subpixels with equal complexity. This partial action approach focuses computational resources on the most critical areas, achieving acceptable luminance uniformity while reducing overall calculation complexity and processing time.
Data Source
AI summary
Embodiments of the disclosure relate to a display device and a display driving method. Specifically, there may be provided a display device comprising a display panel including a plurality of subpixels and a plurality of driving voltage lines supplying a driving voltage to the plurality of subpixels, a plurality of data driving circuits supplying a data voltage to the display panel, a timing controller controlling the plurality of data driving circuits to supply a compensated data voltage according to a position of the display panel, wherein in the compensated data voltage, a first compensation gain for at least some subpixels is varied depending on positions corresponding to the plurality of data driving circuits in a first direction of the display panel, and a second compensation gain for at least some subpixels is varied depending on distances from the plurality of data driving circuits in a second direction of the display panel.