Display Device Low-Luminance Grayscale Uniformity
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Solution Overview
Problem
Light emitting display devices face significant luminance deviations among pixels, particularly at low grayscale levels, leading to luminance non-uniformity and a degraded ability to express grayscales, which can result in burn-in phenomena due to low-current driving and luminance deviations.
Innovation Solution
A display device and method that utilize a reproduction mask pattern to convert input data below a threshold value into reproduction data, incorporating a threshold value, a selected value, and an adjustment value to enhance grayscale expression capability, with pixels displaying specific luminances corresponding to these values, and varying the positions and numbers of these pixels based on accumulated usage and panel characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If low-current driving is used to achieve low luminance display, then power consumption is reduced, but luminance deviation among pixels increases causing burn-in phenomenon
Solution Approach 1:
The patent merges adjacent pixels into pixel groups (e.g., 2x2 groups) and applies dithering techniques across the group to distribute luminance deviations. By combining multiple pixels and using statistical averaging through dithering patterns, the overall luminance uniformity is improved while maintaining low current driving conditions.
Solution Approach 2:
The patent dynamically adjusts driving parameters based on grayscale levels. At low grayscale levels where luminance deviation is more severe, the system applies dithering and pixel grouping dynamically to redistribute luminance. This dynamic adaptation allows the display to maintain uniformity performance across varying luminance conditions while keeping power consumption low.
2Reliability
If dithering is applied to improve low-grayscale uniformity, then grayscale expression capability is enhanced, but image quality may be degraded due to pattern artifacts
Solution Approach 1:
The patent segments the dithering process into multiple stages: first applying dithering within pixel groups, then applying additional dithering at the panel level. This multi-stage segmentation allows the dithering patterns to be broken up and distributed more evenly, reducing the visibility of repetitive patterns and artifacts while maintaining grayscale uniformity.
Solution Approach 2:
The patent transitions from traditional single-dimensional dithering to two-dimensional pixel grouping with multi-directional dithering patterns. By organizing pixels into 2D groups and applying dithering across both spatial dimensions, the pattern artifacts are dispersed more effectively, making them less perceptible to viewers while preserving grayscale expression capability.
3Object-generated harmful factors
If pixel grouping is used to reduce dithering pattern visibility, then pattern artifacts are reduced, but device complexity increases
Solution Approach 1:
The patent implements a universal pixel grouping framework that can be applied to different display resolutions and panel types without requiring fundamental redesign. The same pixel grouping and dithering principles work across various device configurations, reducing the need for device-specific complex processing logic while effectively reducing pattern artifacts.
Data Source
AI summary
The disclosure relates to a display device and a method for driving the same, which are capable of enhancing grayscale expression capability at low luminance. An image processor of the display device according to an embodiment of the disclosure converts data of a low-grayscale area lower than a threshold value into low-grayscale reproduction data, using a grayscale reproduction mask pattern including a selected value, the threshold value and a detailed adjustment value, thereby reproducing a luminance of the low-grayscale area through a combination of the threshold value, the selected value and the detailed adjustment value.