Display Panel Pixel Electrode Light Leakage Reduction
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Solution Overview
Problem
Conventional display technologies face challenges in achieving high aperture ratio and light efficiency due to light leakage during dark state displays, which affects contrast ratio and overall display performance.
Innovation Solution
The display panel design incorporates pixel electrodes with gradually decreasing widths and gaps, configured to converge light and control liquid crystal deflection using a light-shielding pattern, allowing for efficient light absorption and minimizing light leakage by using a smaller light-shielding pattern, thereby enhancing aperture ratio and light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional light-shielding pattern is used in display panels, then light leakage is reduced, but the aperture ratio decreases and light efficiency is compromised
Solution Approach 1:
The light-shielding pattern is segmented into multiple light-shielding strips arranged in specific patterns (such as grid, honeycomb, or radial configurations). This segmentation allows light to be blocked in specific directions while permitting light transmission through other areas, thereby reducing overall light leakage without requiring a large continuous light-shielding region, thus maintaining higher aperture ratio
Solution Approach 2:
Different regions of the light-shielding pattern have different light-shielding properties. The light-shielding strips are strategically positioned and sized to provide enhanced light blocking in areas where light leakage is most problematic, while other regions maintain higher light transmission. This localized optimization reduces the need for extensive light-shielding coverage across the entire display panel
2Object-affected harmful factors
If the light-shielding pattern area is increased to prevent light leakage, then contrast ratio improves, but light efficiency and overall display performance deteriorate
Solution Approach 1:
The segmented light-shielding pattern achieves effective light leakage prevention through strategically positioned strips rather than large continuous shielding areas. This segmentation enables the system to achieve high contrast ratio by blocking leakage paths while preserving light transmission efficiency through the unshielded regions, thus improving contrast ratio without sacrificing light efficiency
Solution Approach 2:
The light-shielding strips are positioned to convert potentially harmful scattered light into beneficial directional light paths. By strategically placing the strips, light that would otherwise leak and reduce contrast is redirected through the liquid crystal layer in controlled paths, improving contrast ratio while the transparent regions between strips maintain high light efficiency
3Ease of manufacture
If pixel electrodes are designed with uniform width, then manufacturing is simplified, but light convergence capability is reduced
Solution Approach 1:
The pixel electrodes are designed with non-uniform width where the central region has a larger width and the peripheral regions have progressively smaller widths. This local variation in electrode geometry creates corresponding variations in electric field distribution, enabling more precise control over light convergence patterns. The broader central electrodes generate stronger fields for primary light bending, while the tapered peripheral edges provide gradient control for refined light positioning, achieving superior light convergence precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively prevents light leakage during dark state displays, improves contrast ratio, and increases light efficiency by converging light into smaller regions, achieving better display performance.
Implementation Method 1
a pixel electrode in the pixel electrodes is configured to converge light entering the pixel electrode from the first substrate... the pixel electrode is used to control a deflection state of a liquid crystal in the liquid crystal layer, so that light passing through the pixel electrode is incident to the light-shielding pattern and/or a corresponding light-exiting region
Data Source
AI summary
A display panel includes: a first substrate and a second substrate; a liquid crystal layer located between the first substrate and the second substrate; pixel electrodes located on a side of the first substrate proximate to the liquid crystal layer; and a light-shielding pattern located on a side of the second substrate proximate to the liquid crystal layer. The second substrate has a light-shielding region shielded by the light-shielding pattern and light-exiting regions not shielded by the light-shielding pattern. A pixel electrode in the pixel electrodes is configured to converge light entering the pixel electrode from the first substrate; and the pixel electrode is used to control a deflection state of a liquid crystal in the liquid crystal layer, so that light passing through the pixel electrode is incident to the light-shielding pattern and/or a corresponding light-exiting region.