Display Device Light Shielding Equal Area Capacitance Balance
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Solution Overview
Problem
In flat-panel display devices, the alignment of liquid crystal molecules is easily disturbed near spacers, leading to issues like light leakage and decreased aperture ratio, which existing techniques attempt to address by using light shields with different areas, but this can result in varying coupling capacitances and display quality deterioration.
Innovation Solution
The implementation of first and second light shielding layers with specific area ratios and patterns, where the areas opposed to the pixel electrodes, gate lines, and source lines are equal, to maintain electrical balance and suppress light leakage while optimizing capacitance retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a first light shield covering an area overlapping a spacer and a second light shield covering an area not overlapping the spacer are used with the first light shield area greater than the second light shield area, then light leakage is suppressed, but aperture ratio decreases
Solution Approach 1:
The patent applies local quality by differentiating the light shielding structure into two distinct regions: a first light shielding layer with larger area positioned at spacer locations to prevent light leakage, and a second light shielding layer with smaller area in non-spacer regions to preserve aperture ratio. This localized differentiation allows each region to have optimal shielding properties without compromising overall display performance.
Solution Approach 2:
The light shielding function is segmented into two separate layers with different areas and positions. The first light shielding layer specifically targets spacer overlap regions while the second layer covers non-spacer regions, dividing the uniform shielding function into specialized segments that address different local requirements.
2Object-affected harmful factors
If light shields with different areas are used to suppress light leakage, then light leakage is reduced, but coupling capacitance varies causing display quality deterioration
Solution Approach 1:
The patent implements local quality by positioning the first light shielding layer with larger area specifically at spacer locations where light leakage occurs, while the second light shielding layer with smaller area is positioned in non-spacer regions. This localized approach ensures light leakage suppression only where needed, maintaining uniform coupling capacitance across the display and preventing display quality deterioration.
3Object-affected harmful factors
If the area of light shielding layers is increased to suppress light leakage, then light leakage is reduced, but aperture ratio and capacitance retention are compromised
Solution Approach 1:
The patent applies local quality by making the first light shielding layer larger only at spacer locations where light leakage is problematic, while keeping the second light shielding layer smaller in non-spacer regions. This localized area differentiation suppresses light leakage effectively while minimizing the overall area occupied by light shielding structures, thereby preserving aperture ratio and capacitance retention.
Data Source
AI summary
According to one embodiment, a display device includes a first light shielding layer, a second light shielding layer, a first semiconductor layer, a second semiconductor layer, a gate line, a first source line, a second source line, a switching element, and a pixel electrode, wherein an area in which the first light shielding layer and the pixel electrode are opposed to each other and an area in which the second light shielding layer and the pixel electrode are opposed to each other are equal in size.