Backside Driver Substrate for Borderless Display
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Solution Overview
Problem
Existing display devices have a cumbersome appearance due to peripheral frames covering non-image displaying areas, which become discontinuous when multiple devices are combined to form a larger screen.
Innovation Solution
A display device design featuring a pixel circuit substrate, light emitting devices, a driver circuit substrate on the backside, and an electrically conductive adhesion layer between the substrates, allowing for a narrow border or borderless display by positioning the driver circuit substrate behind the pixel circuit substrate and using wider connection terminals and adhesion layers for effective electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a frame is used to cover the peripheral area where the driver circuit is disposed, then the driver circuit can be properly enclosed and protected, but the display device looks cumbersome and the screen becomes discontinuous when multiple devices are spliced together
Solution Approach 1:
The driver circuit substrate is merged with the pixel circuit substrate by positioning it on the back side and using an electrically conductive adhesion layer for electrical connection. This integration eliminates the need for separate frames to enclose the driver circuit, allowing the display area to extend to the edges and creating a seamless appearance when multiple devices are spliced together.
Solution Approach 2:
The driver circuit is moved from the peripheral area in the same plane to the back side of the pixel circuit substrate, utilizing the third dimension (depth). This spatial reconfiguration allows the display area to occupy the entire front surface without requiring framing structures, achieving borderless and continuous display when devices are combined.
2Length of stationary object
If the driver circuit substrate is positioned on the back side of the pixel circuit substrate, then the border is narrowed or eliminated, but wider connection terminals and adhesion layers are required for effective electrical connection
Solution Approach 1:
The connection terminals on the driver circuit substrate are electrically connected to the pixel circuit substrate through an electrically conductive adhesion layer. This integrated connection structure achieves effective electrical connection while maintaining a narrow or eliminated border, as the connection elements are incorporated into the substrate assembly rather than requiring separate external connections.
3Ease of manufacture
If the peripheral area is used for disposing the driver circuit, then the driver circuit can be conveniently integrated, but the area cannot display images and requires a frame covering
Solution Approach 1:
The driver circuit substrate is positioned on the back side of the pixel circuit substrate, moving the driver circuit integration to a different spatial plane. This allows the entire front surface of the pixel circuit substrate to be dedicated to display purposes, maximizing the display area while maintaining convenient driver circuit integration through the back-side connection structure.
Data Source
AI summary
A display device includes a pixel circuit substrate, a plurality of light emitting devices, a driver circuit substrate, a plurality of connection terminals, and an electrically conductive adhesion layer. The light emitting devices are electrically connected to the pixel circuit substrate. The driver circuit substrate is disposed on a back side of the pixel circuit substrate. The connection terminals electrically connect the driver circuit substrate to the pixel circuit substrate. The electrically conductive adhesion layer is disposed between the pixel circuit substrate and the driver circuit substrate.