Display Panel Thinned Touch-Driving Plate Bezel Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display panels with touch-control functions have a relatively large bezel due to the need for reserved space and preset distances between components, which limits the screen-to-body ratio and increases the risk of air bubbles and gaps during assembly.
Innovation Solution
A display panel design featuring a touch-control driving plate with thinned and non-thinned portions, where the optical adhesive layer covers the driving plate and polarizer, allowing for reduced bezel size and improved screen-to-body ratio, while preventing air bubbles and gaps through sequential filling of height differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a preset distance is reserved between the touch-control driving plate and the polarizer to avoid interference during assembly, then the assembly reliability is improved, but the bezel size increases and the screen-to-body ratio decreases
Solution Approach 1:
The patent introduces a vertical height dimension by stacking the optical adhesive layer above the touch-control driving plate surface. This allows the polarizer to be attached to the optical adhesive layer at a higher position, eliminating the need for horizontal spacing and enabling the polarizer's vertical projection to overlap with the touch-control driving plate's vertical projection, thus reducing bezel size while maintaining assembly reliability
Solution Approach 2:
The optical adhesive layer serves as an intermediary between the touch-control driving plate and the polarizer. By attaching the polarizer to the optical adhesive layer rather than directly to the touch-control driving plate, the patent enables closer horizontal spacing while preventing interference during assembly, as the optical adhesive layer provides a stable attachment surface at a different vertical level
2Reliability
If the optical adhesive layer covers a large height difference between the touch-control driving plate and the second substrate, then the encapsulation is improved, but air bubbles and gaps may form during assembly
Solution Approach 1:
The touch-control driving plate is divided into a thinned portion and a non-thinned portion, which segments the height difference that the optical adhesive layer needs to cover. The thinned portion reduces the vertical distance between the driving plate surface and the second substrate, allowing the optical adhesive layer to fill smaller height differences sequentially, thereby preventing air bubbles and gaps while maintaining encapsulation reliability
Solution Approach 2:
Different portions of the touch-control driving plate have different thicknesses: the thinned portion has a smaller thickness to reduce height difference and prevent air bubbles, while the non-thinned portion has a larger thickness to provide sufficient coverage area. This local differentiation of thickness optimizes both encapsulation reliability and ease of manufacture
Data Source
AI summary
A display panel includes a first substrate, a light-emitting function layer, a second substrate, an optical adhesive layer and a polarizer stacked in sequence. The display panel further includes a touch-control driving plate disposed on a surface of a first portion of the second substrate facing away from the light-emitting function layer. The first portion of the second substrate is in the non-display area. The optical adhesive layer covers a second portion of the touch-control driving plate. The second portion of the touch-control driving plate covered by the optical adhesive layer includes a thinned portion and a non-thinned portion. Along a first direction of the display area to the touch-control driving plate, the thinned portion and the non-thinned portion are arranged in sequence; a thickness of the thinned portion is less than a thickness of the non-thinned portion.