Light-Blocking Coupling Wiring for Display Transmittance and Crosstalk
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Solution Overview
Problem
Existing display devices cause discomfort due to the inability to view the background in the peripheral region outside the display region, which is addressed by reducing metal material in the counter substrate to improve transmittance, but this increases the resistance between common potential wiring and the common electrode, potentially leading to crosstalk.
Innovation Solution
A display device design that includes an array substrate with pixel electrodes, a counter substrate with a common electrode and light-blocking coupling wiring, and a liquid crystal layer, where the counter substrate has a light-blocking layer to reduce metal material in the peripheral region, coupled with a conductive power feeding portion and coupling wiring to minimize crosstalk and enhance transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal material is reduced in the peripheral region of the counter substrate to improve transmittance, then the background visibility in the peripheral region is improved, but the resistance between common potential wiring and common electrode increases
Solution Approach 1:
The counter substrate is divided into a display region and a peripheral region. In the peripheral region, the light-blocking layer is configured to have reduced metal material or different metal composition, segmenting the metal distribution to improve transmittance in the peripheral region while maintaining sufficient metal content in the display region for electrical performance.
Solution Approach 2:
Different regions of the counter substrate are assigned different metal material characteristics. The peripheral region uses reduced metal content or different metal composition compared to the display region, creating local quality differences that optimize both transmittance in the periphery and electrical connectivity in the display area.
2Illumination intensity
If metal material is reduced in the peripheral region of the counter substrate, then the background visibility is improved, but crosstalk between signal lines increases
Solution Approach 1:
The light-blocking layer is segmented into different regions with different metal characteristics. The peripheral region has reduced metal material to improve background visibility, while the display region maintains sufficient metal content to prevent crosstalk between signal lines through effective shielding.
Solution Approach 2:
The metal material distribution is optimized locally: the peripheral region uses reduced metal content for improved transmittance and background visibility, while the display region maintains higher metal content to provide electromagnetic shielding that prevents crosstalk between adjacent signal lines.
Data Source
AI summary
According to an aspect, a display device includes: an array substrate comprising a plurality of pixel electrodes; a counter substrate comprising a common electrode in a position at least overlapping the pixel electrodes; a liquid crystal layer between the array substrate and the counter substrate; and a light source disposed so as to emit light into a side surface of the array substrate or a side surface of the counter substrate. The array substrate includes, in a display region: a plurality of signal lines arranged in a first direction with spaces between the signal lines; a plurality of scanning lines arranged in a second direction with spaces between the scanning lines; and common potential wiring provided outside the display region. The counter substrate comprises light-blocking coupling wiring that couples the common electrode to a conductive first power feeding portion.