Display Drive Circuit Settling Time Reduction via Gradient Merging
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Solution Overview
Problem
Conventional source drive circuits for display panels face issues with increased electric current consumption and manufacturing costs due to the large number of gamma circuits and reference power source bus lines, leading to prolonged settling time, insufficient gradients, display noise, and uneven displays.
Innovation Solution
A drive circuit with a digital gradient input converter that reduces the number of source amps connected to reference power source bus lines by converting multiple gradient values into fewer gradient values, thereby shortening settling time without increasing electric current consumption or manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple gradient reference voltages are output via separate reference power source bus lines to reduce settling time, then settling time is shortened, but electric current consumption and manufacturing costs increase
Solution Approach 1:
Multiple gradient reference voltages that were previously output via separate reference power source bus lines are merged into a single bus line. The drive circuit includes a single reference power source bus line that outputs multiple gradient reference voltages, eliminating the need for multiple separate bus lines and reducing electric current consumption and manufacturing costs while maintaining short settling time through selective switching.
Solution Approach 2:
The single reference power source bus line is designed to serve multiple functions by outputting multiple different gradient reference voltages (V0 through V255) corresponding to different gradient values. This multi-functional bus line replaces what would traditionally require multiple dedicated bus lines, reducing system complexity while maintaining the ability to provide appropriate reference voltages for different source amps.
2Loss of time
If multiple gradient reference voltages are output via separate reference power source bus lines to reduce settling time, then settling time is shortened, but manufacturing costs increase
Solution Approach 1:
Multiple gradient reference voltages that were previously output via separate reference power source bus lines are merged into a single bus line. The drive circuit includes a single reference power source bus line that outputs multiple gradient reference voltages, eliminating the need for multiple separate bus lines and reducing electric current consumption and manufacturing costs while maintaining short settling time through selective switching.
Solution Approach 2:
The system uses switching elements to rapidly transition between different gradient reference voltages on the single bus line, effectively creating time-separated voltage phases. This allows the bus line to serve multiple voltage functions sequentially rather than requiring parallel physical connections, reducing manufacturing complexity.
3Device complexity
If the number of source amps connected to a reference power source bus line is increased, then device complexity is reduced, but settling time is prolonged
Solution Approach 1:
The switching elements are configured to pre-select and connect source amps to the appropriate gradient reference voltage on the single bus line before actual operation. This preliminary switching action ensures that each source amp is connected to its designated voltage without interference from other connections, maintaining fast settling time despite multiple source amps sharing the same bus line.
Solution Approach 2:
The system uses time-division multiplexing where the single reference power source bus line sequentially provides different gradient reference voltages to different source amps in periodic cycles. This periodic switching allows multiple source amps to share the bus line without interference, reducing device complexity while maintaining appropriate settling characteristics for each connection.
Data Source
AI summary
[Object] To realize a drive circuit where settling time (stabilization time) is shortened, without incurring marked increase in electric current consumed and marked increase in manufacturing costs.[Solution] A source drive circuit (1) has a digital gradient input converter (2) that converts gradient values of multiple image data (D1 through Dn) that are gradient 1 into multiple gradient values, where the number of the multiple source amps (AM1 through AMn) to which a gradient reference voltage (V1) corresponding to gradient 1 is supplied, is reduced, and supplied to a DAC circuit (23).