Source Driver Switch Segmentation for Display Panel Driving
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Solution Overview
Problem
The existing source driver systems face a reduction in driving ability due to the equivalent resistance of the output switches, which affects the performance of the display panel, particularly in modes where the switches are turned on, limiting the charging and discharging capabilities.
Innovation Solution
The implementation of a source driver with a specific configuration including P-channel and N-channel metal oxide semiconductor field effect transistors, ESD protection resistors, and strategically controlled switches to manage the charging and discharging of the display panel, ensuring optimal voltage supply and enhanced driving capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first output switch and the second output switch are turned on to output pixel signals, then the display panel can be driven, but the equivalent resistance of the switches reduces the driving ability of the source driver
Solution Approach 1:
The patent segments the switching function into two independent parts: the first output switch controls the pixel signal output, while the second output switch independently controls the reference voltage output. This segmentation allows the reference voltage to be output without passing through the first output switch's channel, thereby avoiding the equivalent resistance issue that would otherwise reduce driving ability.
2Productivity
If the first output switch and the second output switch are turned on simultaneously, then both pixel signal and reference voltage can be output, but the equivalent resistance reduces charging and discharging capabilities
Solution Approach 1:
The patent introduces a third output terminal as an intermediary pathway for the reference voltage. Instead of forcing the reference voltage through the first output switch (which would add equivalent resistance), the reference voltage has its own dedicated output path through the second output switch and third output terminal, preserving charging and discharging capabilities.
3Power
If the equivalent resistance of output switches is reduced to improve driving ability, then more current can flow, but the switches may overheat or fail
Solution Approach 1:
By segmenting the switching functions into separate switches for pixel signals and reference voltages, the patent distributes the current load across multiple independent pathways. This prevents excessive current concentration in a single switch, thereby reducing heat generation and failure risk while maintaining adequate driving ability.
Data Source
AI summary
A source driver includes an output buffer, a first switch, a second switch, a third switch, a first transistor, and a second transistor. The output buffer includes a first terminal for outputting a plurality of drive voltage to drive a display panel, a second terminal for outputting a first control signal, and a third terminal for outputting a second control signal. The first switch is connected between the first terminal and a display panel. The first transistor includes a first electrode connected to the second terminal via the second switch, a second electrode connected to a first power supply, and a third electrode connected between the first switch and the display panel. The second transistor includes a fourth electrode connected to the third terminal via the third switch, a fifth electrode connected to a second power supply, and a sixth electrode connected to the third electrode of the first transistor.