Display Panel Grayscale Synchronization for Viewing Angle Color Shift
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Solution Overview
Problem
Display panels with viewing angle control pixels experience color change defects when displaying horizontal line patterns, leading to deteriorated display quality due to differing perceived colors from the front and side in normal mode.
Innovation Solution
The display apparatus ensures that grayscale values of specific pixel configurations, such as alternating normal and viewing angle control pixels, are synchronized to maintain consistent luminance across rows, preventing color change defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If viewing angle control pixels are used to achieve private mode functionality, then privacy protection is improved, but color change defects occur in normal mode when displaying horizontal line patterns
Solution Approach 1:
The patent applies local quality by treating viewing angle control pixels and normal pixels differently in the rendering process. Specifically, the grayscale values of viewing angle control pixels are adjusted based on their position and type, while normal pixels are rendered with standard grayscale values. This localized differentiation prevents color change defects in normal mode while maintaining privacy protection functionality.
Solution Approach 2:
The patent changes the parameter of grayscale values dynamically based on pixel type and position. Viewing angle control pixels have their grayscale values modified according to specific rules (e.g., using lower grayscale values or adjusted values) compared to normal pixels. This parameter adjustment eliminates color inconsistency issues while preserving the viewing angle control functionality.
2Ease of operation
If grayscale values of viewing angle control pixels and normal pixels are set equally in normal mode, then display simplicity is maintained, but color change defects occur from side views
Solution Approach 1:
The patent implements local quality by applying different grayscale rendering rules to viewing angle control pixels versus normal pixels. Even though both pixel types are present in normal mode, the system locally adjusts the grayscale values of viewing angle control pixels to compensate for their viewing angle characteristics, thereby preventing color change defects without complicating the overall display operation.
Solution Approach 2:
The patent employs feedback mechanisms where the rendering system adjusts grayscale values based on detected pixel types and their positions. By identifying whether a pixel is a viewing angle control pixel or a normal pixel, the system provides feedback-based grayscale adjustment to maintain color consistency across different viewing angles, thus preventing color change defects while maintaining ease of operation.
3Area of stationary object
If viewing angle control pixels emit light in normal mode, then display coverage is improved, but luminance differences cause color perception variations between front and side views
Solution Approach 1:
The patent applies parameter changes by adjusting the grayscale values (and consequently luminance) of viewing angle control pixels differently from normal pixels. In normal mode, viewing angle control pixels use adjusted grayscale values that account for their emission characteristics, while normal pixels use standard values. This differential parameter adjustment maintains display coverage while ensuring luminance consistency across viewing angles.
Solution Approach 2:
The patent implements local quality by applying distinct rendering characteristics to different pixel types within the display panel. Viewing angle control pixels receive localized treatment with adjusted grayscale values tailored to their specific functionality, while normal pixels maintain standard rendering. This localized differentiation ensures that luminance differences do not cause color perception variations, thus maintaining both display coverage and luminance consistency.
Data Source
AI summary
A display apparatus includes a display panel including a first row first color pixel and a first row second color pixel disposed in a first row, and a second row first color pixel and a second row second color pixel disposed in a second row, and a display panel driver which determines a grayscale value from input image data. One of the first row first color pixel and the second row first color pixel is a normal pixel, and the other is a viewing angle control pixel. One of the first row second color pixel and the second row second color pixel is the normal pixel, and the other is the viewing angle control pixel. Grayscale values of the first and second row first color pixels are the same as each other. Grayscale values of the first and second row second color pixels are the same as each other.