Gamma Voltage Circuit for Display Device Pixel Areas
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Solution Overview
Problem
Conventional gamma voltage generating circuits for display devices become complex and large due to the need for additional taps to drive low-resolution pixels, leading to reduced digital gamma resolution and increased inflection points, which limits the gamma voltage range for high-resolution pixels.
Innovation Solution
A gamma voltage generating circuit with reduced output terminals, specifically including first, second, third, and fourth output terminals for black, higher, and highest grayscale voltages respectively, to simplify the circuit and improve digital gamma resolution by optimizing voltage distribution between low- and high-resolution pixel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional gamma taps are added to drive low-resolution pixels with high luminance, then the low-resolution pixel area can be driven uniformly, but the circuit becomes complex and large
Solution Approach 1:
The gamma voltage generating circuit uses a single set of gamma voltages (first through fourth gamma voltages) to drive both the first pixel area and the second pixel area. The circuit achieves multi-functionality by outputting gamma voltages that can be selectively applied to different pixel areas through the data driver, eliminating the need for separate gamma voltage sets for low-resolution and high-resolution areas.
2Reliability
If additional gamma taps are added to drive low-resolution pixels, then uniform luminance is achieved, but the number of inflection points in the gamma curve increases
Solution Approach 1:
The same four gamma voltages are used for both pixel areas, maintaining a simple gamma curve with limited inflection points. The data driver selectively applies these universal gamma voltages to different pixel areas based on their resolution requirements, achieving uniform luminance without increasing gamma curve complexity.
3Adaptability or versatility
If gamma voltage range is expanded to accommodate low-resolution pixel driving requirements, then low-resolution pixels can be driven, but the gamma voltage range for high-resolution pixels is reduced
Solution Approach 1:
The data driver dynamically selects which pixel area (first or second) is currently being driven and applies the appropriate gamma voltage range. The same four gamma voltages are flexibly allocated to different pixel areas based on real-time driving requirements, allowing the full gamma voltage range to be utilized by high-resolution pixels when needed while still accommodating low-resolution pixel driving requirements.
Data Source
AI summary
The present disclosure relates to a gamma voltage generating circuit and a display device including the same. The gamma voltage generating circuit may include: a first output terminal to output a first gamma voltage set as a black grayscale voltage; a second output terminal to output a second gamma voltage set as a higher grayscale voltage than the black grayscale voltage; a third output terminal to output a third gamma voltage set as a highest grayscale voltage of the first pixel area; and a fourth output terminal to output a fourth gamma voltage set as a highest grayscale voltage of the second pixel area.