AMOLED Gray Scale Display Method for Low-Gray Uniformity
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Solution Overview
Problem
Active-matrix organic light-emitting diode (AMOLED) display devices exhibit poor display effects for low-gray scale images due to significant deviations in color coordinates and gamma curves, particularly as the gray scale decreases.
Innovation Solution
A gray scale display method is introduced, where a pixel module is divided into sub-units, and when the average gray scale is below a preset value, specific pixel units are displayed with a preset gray scale, calculated variance, or determined brightness, to minimize color deviation and improve uniformity, involving sequential display of pixel units at different times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pixel unit is used as the display unit, then the display resolution is high, but the color coordinates and gamma curve deviate significantly at low gray scales
Solution Approach 1:
The patent divides the display screen into multiple pixel modules, where each pixel module consists of multiple pixel units. This segmentation allows the system to treat groups of pixel units as functional units, enabling independent control and display optimization for each module while maintaining overall high resolution.
Solution Approach 2:
The patent applies different display strategies to different pixel modules based on their local characteristics. By calculating gray scale statistics for each pixel module and determining whether module-level display is needed, the system optimizes display quality locally for each region, addressing the color deviation issue at low gray scales without sacrificing overall resolution.
2Adaptability or versatility
If the average gray scale of a pixel module is low, then the display covers more brightness levels, but the color coordinates and gamma curve deviate more significantly
Solution Approach 1:
The patent dynamically adjusts the display mode based on the calculated average gray scale and gray scale variance of each pixel module. When the average gray scale is below a threshold or the variance is below a threshold, the system switches to module-level display with adjusted gray scale values, optimizing the balance between brightness coverage and color accuracy for each specific condition.
Solution Approach 2:
The patent changes the display parameters (gray scale values, display mode) based on the statistical characteristics of each pixel module. By calculating average gray scale and gray scale variance, the system adjusts the gray scale values to be displayed, transforming the display parameters to maintain color accuracy while covering appropriate brightness levels.
3Manufacturing precision
If module-level display is implemented, then the color deviation at low gray scales is reduced, but the display complexity increases
Solution Approach 1:
The patent performs preliminary calculations of average gray scale and gray scale variance for each pixel module before determining the display mode. This preliminary statistical analysis is conducted in advance, allowing the system to pre-determine which pixel modules require module-level display and which can use standard pixel-unit display, reducing runtime complexity.
Solution Approach 2:
The system automatically determines whether module-level display is needed by calculating gray scale statistics itself, without requiring external intervention or complex user input. The pixel modules self-assess their characteristics and the system autonomously selects the appropriate display mode, simplifying the overall control process.
Data Source
AI summary
A gray scale display method is provided. The method includes: dividing a matrix arrangement taking a pixel unit as a display unit into a matrix arrangement taking a plurality of pixel units as the display unit, where the display unit including the plurality of pixel units is a pixel module, and the pixel unit includes at least one sub-pixel; in a case that an average gray scale of the pixel module is smaller than a preset value, displaying a part of the pixel units of the pixel module with a preset gray scale, where the preset gray scale is larger than the average gray scale.