Transistor Substrate with Variable Channel Widths for Display Drive
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Solution Overview
Problem
In display devices, the time constant for signal input to drive electrodes far from the control circuit is large, leading to deteriorated touch detection and display properties due to increased resistance in switching units and power supply wires, with drive electrodes closer to the control circuit having minimal influence.
Innovation Solution
A transistor substrate design with a common wire and conductive wires spaced apart, featuring transistors with varying channel widths and lengths, and transistor groups connected in parallel, to equalize the resistance and time constant across all drive electrodes, reducing the frame region width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If drive electrodes are positioned far from the control circuit to increase display region, then the display region area is improved, but the time constant and resistance increase leading to deteriorated touch detection and display properties
Solution Approach 1:
The patent applies local quality by making the channel widths of transistors non-uniform across different drive electrodes. Specifically, transistors connected to drive electrodes farther from the control circuit have larger channel widths to compensate for the increased resistance in the power supply wire, while transistors closer to the control circuit have smaller channel widths. This localized adjustment of transistor parameters equalizes the time constants across all drive electrodes, maintaining reliable touch detection and display properties throughout the display region.
2Area of stationary object
If drive electrodes are positioned far from the control circuit to increase display region, then the display region area is improved, but the time constant increases leading to deteriorated display properties
Solution Approach 1:
The patent implements local quality by varying the channel widths of transistors based on their position relative to the control circuit. Drive electrodes farther away are connected to transistors with larger channel widths, which have lower resistance, thereby compensating for the increased wire resistance and equalizing the time constant. Drive electrodes closer to the control circuit use transistors with smaller channel widths. This position-dependent design maintains consistent display properties across the entire display region.
3Reliability
If the resistance in switching units and power supply wire increases, then the time constant increases, but this leads to deteriorated touch detection and display properties
Solution Approach 1:
The patent applies parameter changes by systematically varying the channel width parameter of transistors based on their position in the circuit. Transistors connected to drive electrodes farther from the control circuit have larger channel widths, which reduce their on-resistance and compensate for the increased resistance in the power supply wire. This parameter adjustment equalizes the total resistance (transistor + wire) across all drive electrodes, reducing energy loss and maintaining reliable display and touch detection properties.
Data Source
AI summary
A transistor substrate includes a plurality of first transistors formed between a power supply wire and a first conductive wire, and a plurality of second transistors formed between the power supply wire and a second conductive wire. A length of a portion of the power supply wire between the plurality of second transistors and a drive signal generation circuit is longer than a length of a portion of the power supply wire between the plurality of first transistors and the drive signal generation circuit, and a total sum of channel widths of second channels included in the plurality of second transistors is wider than a total sum of channel widths of first channels included in the plurality of first transistors.