Segmented Column Control Circuit for OLED Frame Size Reduction
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Solution Overview
Problem
Conventional display apparatuses using organic EL devices face challenges in minimizing the frame size due to the large distance between the display area and the column control circuit, leading to increased frame size and reduced display area, while also requiring effective sealing to prevent moisture and oxygen ingress.
Innovation Solution
The display apparatus is designed with a divided column control circuit, where a high-speed circuit is placed outside the contact hole and a lower-speed circuit between the contact hole and the display area, and a common interconnecting line surrounds the display area, reducing the circuit and wiring areas without compromising operation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the column control circuit is disposed outside the contact hole with respect to the display area, then the circuit can be arranged in the peripheral area, but the distance between the display area and the column control circuit becomes large, increasing the frame size
Solution Approach 1:
The column control circuit is divided into two separate circuits: a first column control circuit disposed between the contact hole and the display area, and a second column control circuit disposed outside the contact hole. This segmentation allows each circuit to be optimally positioned in different regions, reducing the overall distance and minimizing the frame size while maintaining proper circuit functionality.
Solution Approach 2:
The patent utilizes the vertical dimension by disposing circuits at different positions relative to the contact hole and display area. By strategically placing the first column control circuit in the space between the contact hole and display area, and the second column control circuit outside the contact hole, the design optimizes spatial utilization in multiple dimensions to reduce frame size.
2Reliability
If the sealing adhesive width is increased to enhance sealing ability and prevent moisture permeation, then the sealing performance improves, but the frame area increases and the display area decreases
Solution Approach 1:
The column control circuit is segmented into two parts, allowing the sealing adhesive to be optimized in width for sealing performance without requiring additional space for circuit placement. The first column control circuit is positioned in the space between the contact hole and display area, while the second is outside the contact hole, enabling compact arrangement that reduces frame area while maintaining adequate sealing.
3Area of stationary object
If the distance between the display area and column control circuit is reduced to minimize frame size, then the frame portion size decreases, but the circuit layout becomes more constrained
Solution Approach 1:
The column control circuit is divided into a first column control circuit and a second column control circuit. The first column control circuit is disposed between the contact hole and the display area, while the second column control circuit is disposed outside the contact hole. This segmentation enables flexible circuit layout that accommodates reduced frame size constraints while maintaining proper electrical connections and signal routing.
Solution Approach 2:
By utilizing different spatial regions - placing the first column control circuit in the vertical space between the contact hole and display area, and the second column control circuit in the horizontal space outside the contact hole - the patent achieves compact circuit layout that fits within reduced frame dimensions without excessive constraint.
Data Source
AI summary
A display apparatus includes a display area, in which pixels each including an EL device and a pixel circuit are arranged in a matrix on a substrate, and a column control circuit for controlling the pixel circuit column by column. The EL device is disposed between a lower pixel electrode and an upper transparent electrode on the substrate. The pixel electrode is electrically connected to the pixel circuit, and the transparent electrode is electrically connected to a common interconnecting line via a contact hole. The contact hole and the common interconnecting line are disposed to surround a periphery of the display area. The column control circuit is divided into two circuits one of which is disposed between the contact hole and the display area and the other of which is disposed outside the area between the contact hole and the display area.