OLED Display Substrate Segmentation for Compact Logic Integration
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Solution Overview
Problem
Conventional organic light-emitting displays (OLEDs) face challenges in reducing product volume due to the large area occupied by logic circuitry, which limits the size of the panel when integrating systems on a substrate.
Innovation Solution
The solution involves defining an organic light-emitting pixel area on a first substrate and system circuitry, including a central processing unit and graphic controller, on a second substrate opposite the first, with electrical connection via a conductive member, eliminating the need for a printed circuit board and allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If logic circuitry is integrated on the same substrate as the organic light-emitting pixel area, then device complexity is reduced and space occupancy is minimized, but the area available for the light-emitting pixel area decreases due to the large area required for logic circuits such as CPU and graphic controller
Solution Approach 1:
The display device is divided into two separate substrates: a first substrate containing the organic light-emitting pixel area and driver circuits, and a second substrate containing the logic circuitry (CPU, graphic controller, etc.). This segmentation allows each substrate to be optimized for its specific function, enabling the light-emitting area to occupy the full panel area while logic circuits are housed on a separate substrate that can be mounted on the back surface.
Solution Approach 2:
The logic circuitry is moved from the traditional planar arrangement on the same substrate to a three-dimensional configuration on the opposite substrate. The second substrate is positioned behind the first substrate, utilizing the z-dimension (depth) rather than consuming lateral space, thereby allowing the light-emitting pixel area to occupy the entire front surface area.
2Ease of manufacture
If system circuitry is disposed on a printed circuit board, then ease of manufacture is improved, but space occupancy increases and product volume increases
Solution Approach 1:
The second substrate serving as both the mounting platform for logic circuitry and the structural backing for the display device is merged into the overall device structure. This eliminates the need for a separate printed circuit board, as the second substrate performs dual functions: housing the system circuitry and providing structural support, thereby reducing overall product volume while maintaining ease of manufacture through standardized substrate fabrication processes.
3Adaptability or versatility
If a flexible PCB is used to connect logic circuitry and driver circuits, then adaptability is improved, but space occupancy increases
Solution Approach 1:
The flexible PCB is extracted from the device structure entirely. Instead of using a flexible PCB to connect the logic circuitry to the driver circuits, the invention uses direct electrical connection through conductive members (such as conductive adhesives or anisotropic conductive films) applied to connection pads on the second substrate. This eliminates the need for the flexible PCB, removing the associated space occupancy while maintaining electrical connectivity and adaptability through the conductive member connections.
Data Source
AI summary
An organic light-emitting display (OLED) includes a first substrate, a first organic light-emitting pixel area, a first driver, a second substrate, a system circuitry, and a conductive member. The second substrate is opposite to the first substrate. The first organic light-emitting pixel area is defined on the first substrate and is sealed between the first substrate and the second substrate. The first driver disposed on the first substrate is used for driving the first organic light-emitting pixel area to generate images. The system circuitry disposed on the second substrate is for electrically connected to the first driver. The first substrate and the second substrate are electrically connected with each other through the conductive member.