Pixel Area Coverage Modulation for Display Gradation
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Solution Overview
Problem
Area coverage modulation in display devices reduces display quality due to increased coupling portions and reduced reflective display areas, leading to insufficient gradation expression.
Innovation Solution
A display device with pixels divided into sub-pixels arranged around the center, where the least significant bit display region is closest to the center and higher significant bit regions are further away, performing N-bit area coverage modulation to minimize the impact of division on display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sub-pixels are divided into multiple display regions for area coverage modulation, then gradation expression capability is improved, but the effective display area and reflection area are reduced
Solution Approach 1:
The sub-pixels are divided into multiple display regions (first display region and second display region) corresponding to different bit weights (1-bit and 2-bit areas coverage modulation). This segmentation enables precise gradation expression by independently controlling the area of each region, resolving the contradiction between gradation capability and display area through weighted area combination.
Solution Approach 2:
Different display regions are assigned different areas and bit weights (1-bit region with smaller area, 2-bit region with larger area). This local quality differentiation allows the system to achieve 2-bit gradation precision in specific regions while maintaining overall display area, as each region contributes differently to the final gradation expression.
2Adaptability or versatility
If sub-pixels are divided into multiple display regions, then area coverage modulation is enabled, but the number of coupling portions to signal lines increases
Solution Approach 1:
Multiple display regions (first and second display regions) are electrically connected to a single common signal line. This merging approach enables area coverage modulation with enhanced adaptability while reducing the number of coupling portions, as the common signal line drives multiple regions simultaneously rather than requiring separate signal lines for each region.
3Measurement precision
If display regions are arranged with larger areas for higher bits, then gradation precision is improved, but the arrangement complexity and potential display defects increase
Solution Approach 1:
The display regions are arranged asymmetrically with respect to the pixel center, with the first display region (1-bit) positioned closer to the center and the second display region (2-bit) positioned farther from the center. This asymmetric arrangement optimizes the weight distribution for area coverage modulation, achieving precise gradation expression while simplifying the overall arrangement structure through systematic positioning rules.
Data Source
AI summary
According to an aspect, a display device includes a plurality of pixels each including a plurality of sub-pixels. Each of the sub-pixels is arranged around center of the corresponding pixel and divided into a plurality of display regions to perform N-bit area coverage modulation by a combination of the display regions. The display regions are arranged in such a manner that: a display region corresponding to a least significant bit of the area coverage modulation is arranged closest to the center of the corresponding pixel; and a display region corresponding to a higher significant bit of the area coverage modulation is arranged around the center of the pixel and further from the center of the corresponding pixel (N is a natural number of 2 or more).