Electro-optical Device Substrate Light Shielding Junction Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electro-optical devices like liquid crystal devices, light leakage currents can occur at junction regions, leading to reduced display performance and high-resolution image challenges, particularly due to the need for effective light shielding without compromising aperture ratio and display uniformity.
Innovation Solution
The electro-optical device substrate incorporates a specific arrangement of light shielding portions and capacitive elements to reduce light leakage currents while maintaining high aperture ratios and uniform display characteristics, using a layered structure with varying widths of light shielding portions to target areas prone to light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light shielding film is provided on the channel region to block incident light, then light leakage current is reduced, but the aperture ratio is decreased
Solution Approach 1:
The patent applies different light shielding strategies to different regions: the channel region receives full light shielding coverage, while the junction regions receive targeted light shielding only where needed. This local differentiation allows the aperture ratio to be maximized in non-critical areas while maintaining reliability in light-sensitive regions.
Solution Approach 2:
The light shielding structure is segmented into multiple portions with different widths and positions. The first light shielding portion covers the channel region completely, while the second and third portions selectively cover junction regions. This segmentation allows precise control of light blocking without uniformly reducing the aperture ratio across the entire pixel.
2Reliability
If light shielding portions are extended to cover junction regions, then light leakage current is reduced, but the aperture ratio is further reduced
Solution Approach 1:
The patent implements local quality by providing light shielding exclusively to junction regions where light leakage current occurs, rather than applying uniform shielding across the entire channel region. The second light shielding portion is positioned to cover only the first junction region, and the third light shielding portion covers only the second junction region, allowing the central channel region to maintain high aperture ratio.
Solution Approach 2:
The patent applies partial light shielding action by using light shielding portions with different widths. The first light shielding portion has a width that fully covers the channel region, while the second and third portions have narrower widths that cover only the junction regions. This partial coverage approach reduces light leakage current without excessively reducing the aperture ratio in non-critical areas.
3Productivity
If the pitch between pixels is reduced to achieve high-resolution display, then device size is reduced, but light shielding becomes more difficult without compromising display uniformity
Solution Approach 1:
The patent segments the light shielding function into multiple specialized portions: the first light shielding portion handles channel region shielding, while the second and third portions handle junction region shielding. This segmentation allows each portion to be optimized for its specific function, enabling effective light shielding even when pixel pitch is reduced for high-resolution displays.
Solution Approach 2:
The patent applies local quality by providing targeted light shielding to specific regions (channel and junction regions) rather than uniform shielding across the entire pixel structure. This localized approach allows the aperture ratio to be maximized in display-critical areas while maintaining reliable light shielding in functional regions, thereby supporting high-resolution displays with reduced pixel pitch without compromising display uniformity.
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 configuration effectively minimizes light leakage currents, enhances display performance, and ensures high-resolution images with uniform characteristics across pixels, improving the overall quality of the electro-optical device.
Implementation Method 1
a first light shielding portion formed in an upper layer side than the semiconductor layer along a first direction in which the data line extends and covering the first junction region; a second light shielding portion formed in an upper layer side than the semiconductor layer and covering the second junction region
Data Source
AI summary
An electro-optical device includes plural pixels in a matrix. Switching elements of the pixels extend in a first direction in which data lines extend. Switching elements of pixels that are adjacent in a second direction that intersects the first direction are shifted out of alignment in the first direction. Light shield layers are arranged to make one of parasitic capacitance or aperture ratio the same between pixels that are adjacent in the second direction.