Reflective Layer Through-Hole Alignment for Light Leakage Control
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Solution Overview
Problem
Reflective liquid crystal display panels experience light leakage issues due to inconsistent light reflection at through-holes, which affects display performance, especially when displaying black screens, and conventional solutions like black matrices reduce the effective display area.
Innovation Solution
The array substrate design includes a reflective layer with a through-hole that aligns with the through-hole in the insulating layer, ensuring that light is not reflected at the location of the through-hole, thereby eliminating light leakage without reducing the display area, by using a reflective metal layer with a first through-hole that covers the orthographic projection of the through-hole on the base layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through-hole is disposed on the insulating layer to connect the pixel electrode to the drain, then electrical connection is achieved, but light leakage occurs due to inconsistent light reflection at the through-hole location
Solution Approach 1:
The reflective layer is segmented into two distinct regions: a first reflective region with high reflectivity for normal display areas, and a second reflective region with low reflectivity positioned at the through-hole location. This segmentation allows different optical properties in different spatial zones to simultaneously achieve electrical connection and prevent light leakage.
Solution Approach 2:
The reflective layer exhibits locally differentiated optical properties: high reflectivity in most areas for normal display function, and low reflectivity specifically at the through-hole location to prevent light leakage. This local quality variation resolves the contradiction by applying appropriate reflectivity characteristics to different spatial zones.
2Object-generated harmful factors
If a black matrix is used to block light at the through-hole location, then light leakage is reduced, but the effective display area is reduced
Solution Approach 1:
Instead of using a black matrix that physically blocks light and reduces display area, the invention changes the optical parameter (reflectivity) of the reflective layer at the through-hole location. By adjusting the reflectivity parameter to be low at the through-hole while maintaining high reflectivity elsewhere, light leakage is prevented without sacrificing effective display area.
3Reliability
If a reflective layer is disposed on the array substrate to realize reflective display, then display performance is improved, but light leakage at through-hole locations increases due to inconsistent reflection
Solution Approach 1:
The reflective layer is divided into functionally distinct segments: a first reflective region providing high reflectivity for normal display operation, and a second reflective region with low reflectivity at the through-hole location. This segmentation enables the reflective display to maintain overall performance while eliminating light leakage at critical through-hole positions.
Solution Approach 2:
The reflective layer is designed with spatially varying optical properties, exhibiting high reflectivity in display areas and low reflectivity at through-hole locations. This local differentiation of optical quality allows the system to simultaneously achieve good display performance and prevent light leakage.
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 reduces light leakage and improves display contrast and performance without the need for a black matrix, maintaining the effective reflection and display regions, thus enhancing user experience.
Implementation Method 1
a reflective layer disposed on a side of the first electrode layer away from the second insulating layer and used to realize a reflective display
Data Source
AI summary
An array substrate and a display panel are provided. The array substrate includes a base layer, a first metal layer, a first insulating layer, a second metal layer, a second insulating layer, a first electrode layer, and a reflective layer successively stacked along a direction perpendicular to a plane in which the base layer is located. The second metal layer is used to form a source and a drain of a thin film transistor. The first electrode layer is used to form a pixel electrode. The second insulating layer is provided with a through-hole. The pixel electrode is connected to the drain of the thin film transistor through the through-hole. The reflective layer is provided with a first through-hole, and an orthographic projection of the first through-hole onto the base layer covers an orthographic projection of the through-hole onto the base layer.