Display Driver Gamma Correction Circuit Size Reduction
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Solution Overview
Problem
Existing display drivers require multiple gradation voltage conversion circuits for each color, leading to increased size and complexity, which hinders the miniaturization of display drivers and semiconductor devices.
Innovation Solution
A display driver configuration that includes a gamma correction data transmission unit to transmit gamma correction values periodically and a single gradation voltage conversion unit, capable of converting brightness levels into gradation voltages with gamma characteristics, reducing the need for multiple circuits and minimizing circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple gradation voltage conversion circuits are provided for each color (red, green, blue), then gamma correction for each color can be performed independently, but the circuit area and device size increase significantly
Solution Approach 1:
A single gradation voltage conversion circuit is designed to perform gamma correction for multiple colors (red, green, blue) by sequentially processing gamma correction data for each color. The circuit acts as a universal processor that handles different color channels at different time periods, eliminating the need for separate dedicated circuits for each color while maintaining full gamma correction functionality.
Solution Approach 2:
The gamma correction data transmission unit transmits gamma correction data for different colors in a periodic sequential manner during predetermined periods. The single gradation voltage conversion circuit processes this periodic data stream, switching between different color channels' gamma correction operations in sync with the periodic data transmission, thereby achieving multi-color gamma correction through time-division multiplexing.
2Reliability
If three systems of gradation voltage conversion circuits are implemented, then color-specific gamma correction is achieved, but device complexity and size increase
Solution Approach 1:
The single gradation voltage conversion circuit is designed as a universal processor capable of performing gamma correction for all three color channels. By receiving color-specific gamma correction data sequentially and processing each through the same circuit architecture, the system maintains color-specific correction accuracy while avoiding the complexity of three separate circuit systems.
Solution Approach 2:
The patent merges the functionality of three separate gradation voltage conversion circuits (one for each color) into a single unified circuit. This merging is enabled by the sequential transmission of gamma correction data for different colors and the circuit's ability to process them in time-division manner, reducing device complexity while preserving the reliability of color-specific gamma correction.
Data Source
AI summary
A display driver includes a gamma correction data transmission unit that transmits a plurality of gamma correction data pieces one by one in each predetermined period. A brightness level indicated by a video signal is converted into a gradation voltage with a gamma characteristic based on the gamma correction data piece transmitted from the gamma correction data transmission unit.