Output Transistor On-Resistance Homogenization for Display Driver ICs
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Solution Overview
Problem
In high-definition display devices, the varying length of lead lines between driver ICs and signal lines leads to resistance differences, causing luminance inconsistencies and degraded display quality, as conventional methods struggle to homogenize resistance effectively.
Innovation Solution
A driving circuit configuration that adjusts the on-resistance values of output transistors and resistors connected to lead lines, ensuring they match the resistance of the lead lines, thereby reducing luminance differences and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lead line width is widened to reduce resistance, then the resistance homogeneity is improved, but contact between adjacent wirings is generated
Solution Approach 1:
The patent applies local quality by setting different on-resistance values for output transistors depending on their position in the driver circuit. Output transistors connected to longer lead lines are configured with smaller on-resistance values, while those connected to shorter lead lines have larger on-resistance values. This localized adjustment compensates for lead line resistance variations without requiring physical modification of the lead lines themselves, thereby avoiding wiring contact issues.
Solution Approach 2:
The patent changes the electrical parameter (on-resistance value) of the output transistor to compensate for variations in lead line resistance. By adjusting the on-resistance parameter of output transistors based on their connection position, the overall resistance homogeneity is achieved without modifying the physical dimensions of the lead lines, thus preventing wiring contact problems.
2Reliability
If the lead line width is narrowed to prevent contact, then the wiring reliability is improved, but resistance differences cause luminance inconsistency
Solution Approach 1:
The patent applies local quality by configuring output transistors with position-dependent on-resistance values. This allows the circuit to compensate for lead line resistance variations through electrical parameter adjustment rather than physical modification, maintaining both wiring reliability and luminance uniformity.
Solution Approach 2:
The patent changes the on-resistance parameter of output transistors to compensate for lead line resistance differences. This electrical compensation method achieves luminance uniformity without requiring lead line width adjustments, thereby preserving wiring contact integrity.
3Illumination intensity
If the output transistor on-resistance is adjusted to compensate for lead line resistance, then the luminance uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent implements local quality by assigning different on-resistance values to output transistors based on their specific positions in the driver circuit. This approach achieves luminance uniformity through targeted electrical parameter adjustment rather than complex circuit restructuring, minimizing the increase in device complexity.
Data Source
AI summary
A driving circuit including an output circuit that outputs a signal to a lead line electrically connected to a signal line provided in a display panel; and an output transistor that is provided in the output circuit and connected to an output terminal of the output circuit. An on-resistance value of the output transistor is set according to a resistance value of the lead line electrically connected to the output transistor.