OLED Color Compensation for Boundary Sub-pixel Brightness Alignment
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Solution Overview
Problem
Organic light-emitting diode (OLED) display devices experience color cast issues due to the non-coincidence of brightness centers of red, green, and blue sub-pixels, leading to visual distortions at the boundaries of the display image, particularly shifting to purple or green colors.
Innovation Solution
A color compensation method that involves obtaining color cast brightness, adjusting initial gray levels to achieve compensation brightness, and establishing a correspondence between initial and compensation gray levels to correct color cast through brightness adjustments of sub-pixel groups, either by reducing or enhancing brightness to align brightness centers, and storing this information in an integrated circuit for real-time correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Pentile arrangement is used to reduce sub-pixel density and manufacturing cost, then manufacturing precision and yield are improved, but color cast and visual distortion occur at display boundaries
Solution Approach 1:
The patent applies local quality by implementing gray level compensation specifically for boundary sub-pixels that exhibit color cast issues, while leaving central sub-pixels unchanged. The compensation module identifies boundary regions and applies corrected gray levels only to those specific sub-pixels, preserving the Pentile arrangement's manufacturing advantages while correcting localized color accuracy problems at display boundaries
Solution Approach 2:
The patent changes the gray level parameter for boundary sub-pixels to compensate for color cast. By adjusting the gray level input values for boundary sub-pixels based on their specific color deviation characteristics, the system corrects color accuracy without requiring physical redesign of the Pentile arrangement, thus maintaining manufacturing simplicity while improving display quality
2Device complexity
If brightness centers of red, green, and blue sub-pixels do not coincide, then device complexity is reduced, but color cast and visual distortion occur at display boundaries
Solution Approach 1:
The patent replaces the mechanical/optical alignment approach (physically coinciding brightness centers) with an electrical/control approach (gray level compensation). Instead of redesigning the pixel structure to align brightness centers, the system uses a compensation module to adjust gray level signals electrically, achieving color accuracy without increasing physical device complexity
Solution Approach 2:
The compensation module acts as an intermediary between the input signal and the boundary sub-pixels. It receives the original gray level signal, applies compensation based on color cast characteristics, and outputs corrected signals to boundary sub-pixels, thereby mediating the color accuracy issue without requiring changes to the underlying pixel structure
Data Source
AI summary
A color compensation method, a compensation device, and a display device. The color compensation method includes: a modeling phase including: obtaining color cast brightness of a first sub-pixel group (100) at a boundary of a display image in a display panel upon different gray levels being input; obtaining a first initial gray level of the first sub-pixel group (100); compensating the color cast brightness to obtain compensation brightness; obtaining a compensation gray level corresponding to the compensation brightness; and establishing a correspondence between the first initial gray level and the compensation gray level.