Vertically Stacked Display Driving Chips for Area Reduction
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Solution Overview
Problem
Traditional AMOLED display driver chips integrate various circuits, leading to insufficient area for image information processing, increasing costs due to constant area requirements for power supply and other circuits as pixel density increases.
Innovation Solution
The display driving system consists of two vertically docked chips, one for providing driving data and the other for processing image data, allowing for reduced module area and improved computing capability by separating transistor sizes and circuit functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all circuits are integrated into a single display driver chip, then the chip can provide complete driving functions, but the image information processing circuits cannot occupy sufficient area, reducing computing capability
Solution Approach 1:
The display driver system is divided into two separate chips: a first chip containing power supply control circuits, ESD circuits, source drive circuits, and GOA control circuits; and a second chip containing image information processing circuits. This segmentation allows each chip to be optimized for its specific function, with the second chip dedicating sufficient area to image processing while the first chip handles constant-area control functions.
2Manufacturing precision
If the process size decreases or the number of pixel rows/columns increases, then the display resolution improves, but the circuits requiring constant area greatly increase the cost of the display driver chip
Solution Approach 1:
By separating constant-area control circuits from image processing circuits into different chips, the system allows the image processing chip to be optimized for high-resolution processing without being constrained by the constant area requirements of control circuits. This reduces manufacturing costs as resolution increases.
3Reliability
If the area of circuits requiring constant area is maintained, then the chip can provide stable control functions, but the overall chip area increases, reducing the area available for image processing
Solution Approach 1:
The first chip is dedicated to control functions with constant area requirements, ensuring stable and reliable operation. The second chip is dedicated to image processing, maximizing its area for computing operations. This functional segmentation resolves the area conflict while maintaining control stability.
4Productivity
If image information processing circuits are given more area, then computing capability improves, but the overall chip area increases, requiring more resources
Solution Approach 1:
The system transitions from a single-plane chip integration to a three-dimensional stacked architecture, with the first chip positioned below the second chip. This vertical arrangement allows both chips to have sufficient area for their respective functions without increasing the overall footprint, effectively utilizing the vertical dimension to resolve area constraints.
Data Source
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AI summary
A display driving system includes a first chip (10) and a second chip (20) that are vertically docked; the first chip includes a first substrate (11) and a first silicon wafer (12) provided on a side of the first chip distal from the first substrate; the second chip includes a second substrate (21) and a second silicon wafer (22) disposed at a side of the second chip distal from the second substrate; the first chip is docked with the second chip through docking of the first silicon wafer and the second silicon wafer; wherein, the first chip is configured to provide driving data, and the second chip is configured to process image data.