Display Device Signal Delay Equalization via PCB Wiring
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Solution Overview
Problem
As display devices increase in size, signal delay variations due to resistance differences in fan-out wirings lead to degradation of display quality, and existing methods to mitigate this are limited by the need for a narrow bezel, which restricts structural changes in the non-display area.
Innovation Solution
The display device incorporates a printed circuit board connected to the center of the fan-out area with circuit board wirings and fan-out wirings arranged in specific configurations to equalize signal delay variations, including varying lengths and orientations to compensate for resistance differences, allowing for a narrow bezel design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the width of the non-display area is decreased to achieve a narrow bezel, then the aesthetic appearance and consumer preference are improved, but the ability to equalize signal delay variation through fan-out wiring structure changes is limited
Solution Approach 1:
The patent transitions from adjusting fan-out wiring structures within the non-display area to adjusting circuit board wiring structures on the PCB. By moving the adjustment dimension to the PCB level, the solution achieves signal delay equalization without requiring changes to the non-display area width, thus maintaining the narrow bezel design while resolving signal delay issues.
Solution Approach 2:
The patent introduces the PCB as an intermediary component between the driving integrated circuit and the display panel. By placing compensation wirings on the PCB rather than directly in the non-display area, the solution mediates the conflict between narrow bezel requirements and signal delay equalization needs.
2Reliability
If the length of fan-out wirings is increased to compensate for signal delay, then the signal delay variation is reduced, but the total wiring length and complexity increase
Solution Approach 1:
The patent applies local quality by making only specific circuit board wirings (those connected to shorter fan-out wirings) longer than the standard length, rather than changing all wirings uniformly. This localized adjustment equalizes signal delay without unnecessarily increasing overall wiring complexity.
Solution Approach 2:
The patent changes the length parameter of specific circuit board wirings to compensate for signal delay variations. By adjusting the length parameter of individual wirings based on their corresponding fan-out wiring lengths, the system achieves signal delay equalization with minimal complexity increase.
3Area of moving object
If the display device size is increased, then the display area is improved, but the variation in length and resistance of fan-out wirings increases leading to signal delay degradation
Solution Approach 1:
The patent segments the wiring system into two distinct parts: fan-out wirings on the display substrate and circuit board wirings on the PCB. This segmentation allows independent optimization of each part, enabling the display area to be enlarged while signal delay is equalized through adjustments to circuit board wirings.
Solution Approach 2:
Instead of adjusting fan-out wiring lengths to compensate for signal delay (the conventional approach), the patent inverts the approach by adjusting circuit board wiring lengths. This reverse adjustment strategy achieves the same signal delay equalization goal while accommodating larger display sizes.
Data Source
AI summary
A display device includes a display substrate having a fan-out area, and a plurality of driving integrated circuits are arranged to reduce a signal delay variation. A printed circuit board (PCB) is connected to the fan-out area, and a driving integrated circuit (IC) is disposed on the PCB in a second direction. A first circuit board wiring is disposed on the PCB and connected to the driving IC. A second circuit board wiring is disposed in the second direction and connected to the driving IC. A first fan-out wiring is disposed on the fan-out area and connected to the first circuit board wiring, and a second fan-out wiring is disposed in the second direction from the fan-out area and connected to the second circuit board wiring. A sum of the length of the wiring of the first circuit board and the second circuit board may be substantially the same.