Display Panel Black Matrix Annular Openings for ESD Protection
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Solution Overview
Problem
Electrostatic discharge (ESD) poses significant challenges in the manufacturing and usage of electronic products, causing sudden and potential damage, which is difficult to detect and leads to instability and shortened service life.
Innovation Solution
A display panel design featuring a black matrix layer with strategically placed annular openings in the peripheral region, disconnecting it from the display region, and an electrostatic shielding layer to prevent static electricity from entering the display area, thereby reducing electrostatic defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the black matrix layer is continuous to provide complete light shielding, then light shielding performance is improved, but electrostatic discharge protection is worsened due to lack of discharge paths
Solution Approach 1:
The continuous black matrix layer is segmented by introducing openings (first openings and second openings) that extend from the first surface to the second surface. This segmentation creates discontinuities that serve as electrostatic discharge paths while maintaining light shielding in non-opening regions, thus resolving the contradiction between continuous light shielding and electrostatic protection.
Solution Approach 2:
The openings in the black matrix layer act as intermediaries that simultaneously address two functions: they allow electrostatic charge to dissipate through the openings while permitting light to pass through to the display region. The sealant filling the openings further mediates by providing electrostatic discharge pathways while maintaining structural integrity and light transmission properties.
2Reliability
If openings are added to the black matrix layer for electrostatic discharge, then electrostatic protection is improved, but light shielding performance is worsened due to increased light leakage
Solution Approach 1:
Different regions of the black matrix layer are assigned different functions: regions with openings provide electrostatic discharge pathways, while regions between openings maintain light shielding. The openings are strategically positioned and sized to minimize light leakage while maximizing electrostatic discharge capability, achieving local optimization of both properties.
Solution Approach 2:
The sealant material filling the openings acts as a flexible medium that can be configured to control light transmission while maintaining electrostatic discharge pathways. The thin film structure of the sealant allows it to fill the openings completely, providing both mechanical support and controlled optical properties.
3Reliability
If multiple layers and openings are introduced to prevent electrostatic damage, then electrostatic protection is improved, but device complexity is worsened
Solution Approach 1:
The black matrix layer is designed to serve multiple functions simultaneously: light shielding, electrostatic discharge pathway provision, and structural support. The sealant material also performs multiple roles: filling openings, providing additional electrostatic discharge paths, and maintaining structural integrity. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The electrostatic discharge protection function is merged into the existing black matrix layer structure rather than being implemented as a separate component. The openings in the black matrix layer serve dual purposes of maintaining light shielding while providing electrostatic discharge pathways, combining two functions into a single structural element.
Data Source
AI summary
A display panel and a display device are provided. The display panel has a display region and a peripheral region on a periphery of the display region and includes: an array substrate; an opposed substrate, opposite to the array substrate; a sealant, in the peripheral region so that the array substrate and the opposed substrate are bonded to form a cell; and a black matrix layer, between the array substrate and the opposed substrate. At least one opening in the peripheral region is provided in the black matrix layer, the at least one opening includes a first annular opening which is between the sealant and the display region and surrounds the display region, and the black matrix layer is disconnected at a position of the at least one opening.