Gamma Reference Voltage Circuit With Split DAC Ranges
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Solution Overview
Problem
Conventional gamma reference voltages generating circuits require a large number of digital-to-analog converters, leading to wasted layout area and increased fabrication costs, while maintaining full range decoding is a challenge.
Innovation Solution
A gamma reference voltages generating circuit is designed with a voltage provider and two types of digital-to-analog converters, where the number of converters is reduced by half by using different structures based on voltage ranges, maintaining full range decoding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the conventional structure uses the same mechanism for each gamma reference voltage generation, then full range decoding is maintained, but a large number of digital-to-analog converters are required leading to wasted layout area and increased fabrication costs
Solution Approach 1:
The patent segments the gamma reference voltage generation into two distinct ranges: a first range (Vcom to VH) and a second range (Vcom to VL). Each range uses a dedicated digital-to-analog converter optimized for its specific voltage range, thereby reducing the total number of converters needed while maintaining full decoding capability across the entire gamma range.
Solution Approach 2:
The patent applies different digital-to-analog converter structures tailored to specific voltage ranges. The first digital-to-analog converter is optimized for generating voltages between Vcom and VH, while the second is optimized for voltages between Vcom and VL. This local optimization reduces overall circuit complexity and area while preserving full range functionality.
2Ease of manufacture
If the conventional structure uses 10-bit digital-to-analog converters for all gamma reference voltages, then full range decoding is achieved, but the circuit complexity and fabrication cost increase
Solution Approach 1:
The patent changes the parameters of the digital-to-analog converters by creating two separate converters with different voltage ranges. Instead of using uniform 10-bit converters across the entire range, the first converter handles the upper range (Vcom to VH) and the second handles the lower range (Vcom to VL), optimizing precision and reducing complexity for each specific range.
Data Source
AI summary
A gamma reference voltages generating circuit is disclosed in the present invention. The gamma reference voltages generating circuit comprises a voltage provider, a plurality of first digital-to-analog converters and a plurality of second digital-to-analog converters. The voltage provider generates a plurality of first supply voltages and a plurality of second supply voltages according to a first gamma reference voltage. The first digital-to-analog converters are electrically coupled to the first supply voltages for generating a plurality of second gamma reference voltages. The second digital-to-analog converters are electrically coupled to the second supply voltages for generating a plurality of third gamma reference voltages.