Array Substrate Light Shielding for Display Flicker
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Solution Overview
Problem
In curved liquid crystal displays, misalignment of TFT switches and pixels leads to light leakage, requiring larger Black Matrices that compromise transmittance, and existing light shielding designs result in significant coupling capacitance and screen flicker due to vertical crosstalk.
Innovation Solution
The array substrate design includes a substrate with intersecting data and gate lines, featuring pixel units with partially overlapping pixel electrodes and light shielding portions, reducing coupling capacitance and flicker by optimizing the overlap areas between these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the Black Matrix is made larger to prevent light leakage, then light leakage is reduced, but transmittance is significantly reduced
Solution Approach 1:
The light shielding function is segmented between the light shielding portion and the data line, with the light shielding portion providing primary shielding and the data line providing secondary shielding through partial overlap, replacing the need for a single large Black Matrix
Solution Approach 2:
The light shielding is achieved by extending shielding function into the spatial dimension through the light shielding portion positioned between pixels, rather than relying solely on the planar Black Matrix expansion
2Object-affected harmful factors
If the gate electrode and data line are used to shield light, then light leakage is prevented, but large coupling capacitance is produced resulting in serious vertical crosstalk
Solution Approach 1:
The light shielding portion acts as an intermediary element that provides light shielding without directly contacting the data line, reducing coupling capacitance while maintaining shielding effectiveness through the overlapping projection design
3Object-affected harmful factors
If the common electrode and data line are used to shield light, then light leakage is prevented, but large coupling capacitance is produced resulting in significant screen flicker
Solution Approach 1:
The light shielding portion serves as an intermediary that provides light shielding while minimizing capacitive coupling with the data line through its specific positioning and partial overlap design, preventing screen flicker
4Object-generated harmful factors
If the orthographic projection of the light shielding portion is partially overlapped with the data line, then coupling capacitance is reduced, but light shielding effectiveness may be compromised
Solution Approach 1:
The light shielding portion has different overlap characteristics at different locations: partial overlap with the data line to reduce capacitance while maintaining sufficient shielding coverage to prevent light leakage
Solution Approach 2:
The light shielding system combines the light shielding portion and data line in a composite arrangement where their overlapping projections create both electrical isolation and optical shielding functions
Data Source
AI summary
The present disclosure relates to an array substrate, a display panel and a display device. The array substrate includes a substrate, data lines, gate lines, and a pixel unit, wherein a pixel electrode and a light shielding portion are disposed in the pixel unit, and for the light shielding portion and the data line corresponding to each other, an orthographic projection on the substrate of the light shielding portion is partially overlapped with an orthographic projection on the substrate of the data line, and wherein a part of each side, that is parallel to the data line, of an orthographic projection on the substrate of the pixel electrode is only overlapped with the orthographic projection on the substrate of the data line, and the other part of the each side is only overlapped with the orthographic projection on the substrate of the light shielding portion.