Gamma Voltage Generating Circuit for Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gamma voltage generating circuits for display devices face challenges in efficiently generating gamma reference voltages for different color pixels, leading to issues with white balance and output balance, and require complex resistor networks that increase circuit size and risk errors due to resistor mismatch.
Innovation Solution
A gamma voltage generating circuit that includes a gamma voltage distribution unit using a string resistor with uniformly valued resistors to generate initial gamma reference voltages, and a gamma voltage selection unit that selects specific voltages corresponding to each color pixel, sharing output parts and input parts to reduce circuit size and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex resistor networks are used to generate gamma reference voltages for different color pixels, then white balance and output balance can be maintained, but circuit size increases and resistor mismatch errors increase
Solution Approach 1:
The patent employs a universal string resistor structure that generates multiple initial gamma reference voltages simultaneously. This single resistor network serves multiple color pixels (R, G, B) by providing different voltage taps along the resistor string, eliminating the need for separate resistor networks for each color pixel while maintaining proper gamma characteristics and white balance.
Solution Approach 2:
The patent segments the gamma reference voltage generation by dividing the string resistor into multiple sections with different resistance values. Each segment provides a specific voltage level corresponding to different color pixels' gamma curves. This segmentation allows different gamma reference voltages to be derived from a single unified structure, reducing circuit complexity while maintaining reliability.
2Reliability
If complex resistor networks are used to generate gamma reference voltages for different color pixels, then white balance and output balance can be maintained, but resistor mismatch errors increase
Solution Approach 1:
The patent merges multiple gamma reference voltage generation functions into a single string resistor structure. By combining what would traditionally be separate resistor networks into one unified component, the patent reduces the total number of resistors that need to be manufactured and matched, thereby reducing cumulative mismatch errors while maintaining the ability to provide different gamma reference voltages for R, G, and B color pixels.
3Reliability
If separate gamma reference voltages are provided for each color pixel, then white balance is maintained, but circuit size increases
Solution Approach 1:
The string resistor structure serves as a universal voltage generation platform that provides gamma reference voltages for multiple color pixels simultaneously. Different voltage taps along the resistor string correspond to different color pixels' requirements, allowing a single structure to fulfill multiple functions that would traditionally require separate circuits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient generation of gamma reference voltages for display devices, maintaining white balance and output balance, while reducing circuit size and minimizing errors due to resistor mismatch, and allows for detailed adjustment of gray levels.
Implementation Method 1
a gamma voltage distribution unit configured to divide a reference voltage to generate a plurality of initial gamma reference voltages
Data Source
AI summary
A gamma voltage generating circuit includes a gamma voltage distribution unit configured to divide a reference voltage to generate a plurality of initial gamma reference voltages, and a gamma voltage selection unit configured to generate gamma reference voltages by selecting first gamma reference voltages, corresponding to a first color pixel, from among the plurality of initial gamma reference voltages and second gamma reference voltages, corresponding to a second color pixel, from among the plurality of initial gamma reference voltages. Herein, an output part of initial gamma reference voltages selected in common as the first and second gamma reference voltages is shared with input parts of the first and second gamma reference voltages.