Sub-pixel Compensation for OLED Color Balance Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, such as OLED and LCDs, suffer from component degradation that leads to uneven luminance across colors, disrupting color balance and image appearance due to differential degradation rates of color-generating components.
Innovation Solution
Implementing sub-pixel compensation techniques where a computing device adjusts the voltage across sub-pixels to maintain consistent luminance, using a combination of sub-pixels to approximate a single color and compensating for voltage drops due to component degradation by altering the voltage of additional sub-pixels within a pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices use color-generating components (OLED or LCD with color filters), then various colors can be displayed, but component degradation occurs at different rates causing color balance deterioration
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors the actual luminance output of each sub-pixel over time and automatically adjusts the drive voltage to compensate for degradation. The controller measures the voltage drop across sub-pixels and modifies subsequent drive signals to maintain consistent luminance, creating a closed-loop control system that preserves color balance despite component aging
Solution Approach 2:
The patent changes the electrical parameters (voltage and current) applied to sub-pixels based on their degradation state. By dynamically adjusting the drive voltage to account for increased voltage drop in degraded components, the system maintains consistent luminance output. This involves modifying operational parameters rather than physical structure to compensate for aging effects
2Illumination intensity
If higher voltage is applied to compensate for sub-pixel degradation, then luminance is maintained, but energy consumption increases
Solution Approach 1:
The patent applies local quality by compensating only for the specific sub-pixels that have degraded rather than uniformly increasing power to all sub-pixels. The system identifies individual sub-pixels with increased voltage drop and applies targeted voltage adjustments only to those affected components, maintaining luminance consistency while minimizing overall energy consumption
3Reliability
If multiple sub-pixels of the same color are used within a pixel, then color balance can be maintained through compensation, but device complexity increases
Solution Approach 1:
The patent segments each pixel into multiple independently controllable sub-pixels of the same color (e.g., multiple blue sub-pixels per pixel). This segmentation allows the system to independently monitor and adjust each sub-pixel's drive voltage based on its individual degradation characteristics, enabling precise color balance maintenance while managing complexity through modular control
Data Source
AI summary
Sub-pixel compensation is described. In at least some implementations, a computing device includes a plurality of sub-pixels within a pixel which may generate an alternating display to approximate the display of a single sub-pixel. In other implementations, a voltage is applied to sub-pixels of a color such that a voltage across a first sub-pixel is proportional to a voltage across one or more additional sub-pixels. In other implementations, a change in a voltage drop across a sub-pixel is detected, and the change is compensated for by altering a voltage of a second sub-pixel within the pixel.