Display Panel Spacer Layout for COG Mura Suppression
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Solution Overview
Problem
The deformation and warping of glass substrates in liquid crystal display panels due to thermal expansion coefficient differences during the COG process lead to light leakage (COG Mura phenomenon), affecting display quality.
Innovation Solution
A display panel design incorporating a cushion layer structure and strategically positioned spacers that provide support between substrates, reducing deformation and warping by enhancing buffering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If COG method is used to bond IC chip on glass substrate, then electrical connection between IC and leads is achieved, but glass substrate deforms and warps due to thermal expansion coefficient differences
Solution Approach 1:
A cushion layer structure is introduced between the glass substrate and the IC chip bonding area. This cushion layer absorbs and distributes the thermal stress generated during the COG bonding process, preventing the glass substrate from deforming and warping while still allowing reliable electrical connection to be achieved.
2Ease of manufacture
If glass substrate is used in COG process, then manufacturing is enabled, but light leakage occurs due to substrate warping
Solution Approach 1:
The cushion layer structure is positioned underneath the bonding area to prevent substrate warping before the COG process is completed. By providing support in advance, the substrate maintains its flatness throughout manufacturing, eliminating the light leakage issue that would otherwise occur due to warping.
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
The design effectively minimizes substrate warping and light leakage, improving display panel stability and visual uniformity.
Implementation Method 1
Due to differences in thermal expansion coefficients of the three materials, the glass substrate is prone to deformation and warping after the manufacturing is completed
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a display region and a peripheral region including a first sub peripheral region. The display panel includes: a first substrate including: a first base; and a black matrix and color resistance portions on the first base, where color resistance portions are arranged in the display region; and spacers on the first base, where the spacers include a first spacer located in the first sub peripheral region and a second spacer located in the display region; a second substrate opposite to the first substrate, including: a second base; pixel driving circuits on the second base; and a driving chip on the second base, where the driving chip is located in the first sub peripheral region; and a sealing adhesive between the first substrate and the second substrate, where the sealing adhesive surrounds the display region.