Display Driving Chip Power Layout for Low Line Resistance Variation
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Solution Overview
Problem
Conventional driving chips experience output signal variations due to line resistance variations between the power input terminal and circuit cells, leading to potential defects in driving chip performance.
Innovation Solution
The driving chip design includes a main input part, circuit cells, and an auxiliary input part, with the auxiliary input part spaced closer to the circuit cells than the main input part, and an auxiliary power line on the line substrate connecting the main and auxiliary power input terminals, reducing line resistance variations and signal output differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the power input terminal is positioned at the end portions of signal input terminals, then the chip layout is simplified and manufacturing is easier, but line resistance variation increases due to distance variation between power input terminal and circuit cells
Solution Approach 1:
The power input structure is segmented into multiple power input terminals (first and second power input terminals) positioned at different locations. This segmentation allows the power signal to be distributed to circuit cells through multiple paths, reducing the line resistance variation that would occur with a single distant power input terminal.
Solution Approach 2:
Different regions of the chip are provided with different power input configurations. The first power input terminal serves circuit cells in one region while the second power input terminal serves circuit cells in another region, ensuring that each local area has optimized power delivery with minimized line resistance variation.
2Quantity of substance
If the distance between power input terminal and circuit cells is large, then more circuit cells can be accommodated on the chip, but output signal variation increases due to line resistance variation
Solution Approach 1:
The power distribution system is segmented into multiple independent power input terminals, each serving specific circuit cells. This allows the chip to accommodate more circuit cells across different regions while maintaining low line resistance variation for each segment, thereby preventing output signal variation.
3Device complexity
If a single power input terminal is used, then device complexity is reduced, but driving chip defects occur due to significant line resistance variation
Solution Approach 1:
The power input structure is divided into multiple power input terminals instead of using a single terminal. This segmentation reduces the line resistance variation for each power delivery path, preventing driving chip defects while maintaining relatively simple device architecture.
Data Source
AI summary
A driving chip includes a main input part, a plurality of circuit cells and an auxiliary input part. The main input part includes a plurality of input terminals which receive an external signal. The circuit cells generate a driving signal in response to a signal applied from the main input part. The auxiliary input part is spaced apart from the circuit cells by a first distance that is shorter than a second distance between the main input part and the auxiliary input part. The auxiliary input part receives the external signal and applies the external signal to the circuit cells. Therefore, line resistance variation between the circuit cells of the driving chip and a power input terminal may be decreased, so that driving chip defects may be prevented.