Display Device Static Charge Discharge via Conductive Light Shielding
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Solution Overview
Problem
Display devices, particularly self-light emitting OLEDs, suffer from the Greenish and brightening phenomena due to ineffective discharge of electric charges, leading to inferior display quality.
Innovation Solution
A display device configuration that includes a display panel with a conductive heat dissipation sheet, a light shielding layer in a lattice pattern, and a discharge member to manage static electricity, reducing charge concentration and enhancing electrical conductivity for efficient discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display panel structure is used without dedicated discharge paths, then the device structure remains simple, but electric charge accumulates on the bezel area causing Greenish and brightening phenomena
Solution Approach 1:
The light shielding layer is divided into multiple segments including a first light shielding layer and a second light shielding layer, with the second layer forming a lattice pattern. This segmentation allows the structure to provide effective charge discharge paths while maintaining design flexibility and managing electrical conductivity distribution across different bezel areas.
Solution Approach 2:
The light shielding layer serves multiple functions simultaneously: it shields light to prevent display defects, provides charge discharge paths to eliminate Greenish and brightening phenomena, and offers structural support. The heat dissipation sheet also serves dual purposes of thermal management and electrical charge discharge.
2Reliability
If the light shielding layer is made fully conductive to discharge static electricity, then charge discharge efficiency improves, but light shielding performance deteriorates
Solution Approach 1:
Different regions of the light shielding layer have different electrical conductivity properties. The first light shielding layer has higher conductivity for effective charge discharge, while the second light shielding layer in lattice pattern provides localized discharge paths. This local quality differentiation allows simultaneous achievement of light shielding and charge discharge functions.
Solution Approach 2:
The light shielding structure uses composite material configuration with conductive materials integrated into the light shielding layer. The combination of conductive layers and lattice patterns creates a composite structure that balances electrical conductivity for charge discharge with optical properties for light shielding.
3Reliability
If charge discharge paths are added to eliminate Greenish phenomenon, then display quality improves, but manufacturing complexity increases
Solution Approach 1:
The charge discharge function is merged with the existing light shielding layer and heat dissipation sheet. By integrating conductive layers into the light shielding structure and utilizing the heat dissipation sheet's conductivity, the patent eliminates the need for separate discharge components, thereby improving display quality while managing manufacturing complexity.
Solution Approach 2:
The conductive adhesive layer serves as an intermediary component that electrically connects the heat dissipation sheet with the light shielding layer, enabling charge discharge paths without requiring direct contact or complex integration. This mediator approach simplifies the manufacturing process while achieving the desired electrical connectivity.
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 solution effectively reduces the Greenish and brightening phenomena by forming a travel path for electric charges, minimizing charge loss and improving display quality.
Implementation Method 1
a discharge member configured to discharge static electricity generated in the cover glass to the heat dissipation sheet by electrically connecting the heat dissipation sheet with the light shielding layer
Implementation Method 2
a heat dissipation sheet configured to be disposed on another surface of the display panel and have electrical conductivity; a light shielding layer configured to be disposed at edges of a surface of the cover glass and have electric conductivity
Data Source
AI summary
A display device includes a display panel configured to dispose a plurality of pixels; a cover glass configured to be disposed on a surface of the display panel; a heat dissipation sheet configured to be disposed on another surface of the display panel and has electrical conductivity; a light shielding layer configured to be disposed at edges of a surface of the cover glass and have electric conductivity; and a discharge member configured to discharge static electricity generated in the cover glass to the heat dissipation sheet by electrically connecting the heat dissipation sheet with the light shielding layer.