In-Cell Touch Electrode Integration for Narrow Bezel LCD Design
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Solution Overview
Problem
Conventional touch liquid crystal display devices require a wide bezel due to the need for non-active regions with touch lines, limiting design flexibility and manufacturing efficiency, especially when integrating logos or camera holes into the cover window.
Innovation Solution
The implementation of an in-cell type liquid crystal display device with touch electrodes integrated within the panel, where the cover window is sized larger than the display region but smaller than the panel, eliminating the need for separate touch panels and non-active region coverage, allowing for a narrower bezel and improved design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate touch panel is attached to the liquid crystal panel with touch lines extending to the touch IC, then the touch function is achieved, but the non-active region width increases requiring a wide bezel
Solution Approach 1:
The patent merges the touch electrode and liquid crystal electrode into a single integrated electrode structure. The touch electrode is formed in the same non-active region as the liquid crystal electrode, eliminating the need for separate touch lines extending to the touch IC. This integration allows the cover window to be smaller and the bezel to be narrower while maintaining full touch functionality.
2Reliability
If the cover window is sized to cover the entire touch panel including non-active regions, then the touch panel is fully protected, but the black matrix must cover the non-active region reducing design flexibility
Solution Approach 1:
The patent extracts the touch electrode from the traditional separate touch panel structure and integrates it directly into the liquid crystal panel's non-active region. This allows the cover window to be sized to match the liquid crystal panel exactly, eliminating the need for a black matrix to cover non-active regions. The touch functionality is preserved while enabling full design freedom for logos, camera holes, and other custom features.
3Adaptability or versatility
If multiple types of products with different cover window configurations are produced, then customer requirements are met, but manufacturing efficiency decreases
Solution Approach 1:
The patent creates a universal liquid crystal panel design where the touch electrode is integrated into the standard non-active region structure. This standardized design can accommodate various customer requirements (logos, camera holes, different sizes) without requiring different panel configurations. The single integrated electrode structure serves multiple functions while maintaining consistent manufacturing processes, thereby improving productivity.
Data Source
AI summary
A liquid crystal display device includes: a liquid crystal panel in which a display region in which a plurality of touch blocks are arranged and a non-display region around the display region are defined, wherein the liquid crystal panel includes a first substrate and a second substrate facing each other and a polarizer attached to an outer surface of the first substrate, and a touch electrode is provided in each of the plurality of touch blocks; and a cover window attached to an outer surface of the polarizer through an adhesive layer, wherein the cover window has a size greater than that of the display region and smaller than or equal to that of the first substrate.