Display Data Driver Gamma Voltage Adjustment for Boundary Reduction
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Solution Overview
Problem
Display devices, especially flexible and foldable ones, face issues with pixel deterioration over time, leading to visible boundaries and increased power consumption when switching between driving modes.
Innovation Solution
A display device with a data driver that generates different gamma voltages for pixels based on their driving state, allowing for both entire and partial driving modes, minimizing boundary recognition and reducing power consumption by adjusting voltage references and look-up tables accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If partial driving method is used to reduce power consumption, then power consumption is reduced, but boundary recognition between driven and non-driven areas increases
Solution Approach 1:
The patent applies local quality by adjusting gamma voltages specifically for pixels in the driven area versus non-driven area. Different gamma voltage values are applied to different spatial locations based on their driving state, creating localized optical properties that compensate for the boundary effect while maintaining partial driving mode benefits.
Solution Approach 2:
The patent changes the gamma voltage parameter dynamically based on the driving mode and pixel location. By adjusting the gamma voltage values for different areas (driven vs. non-driven), the patent modifies the electrical parameters to compensate for luminance differences and minimize boundary recognition, thus resolving the contradiction between power saving and visual quality.
2Object-affected harmful factors
If entire driving method is used to maintain uniform display quality, then boundary recognition is minimized, but power consumption increases
Solution Approach 1:
The patent enables selective driving of different pixel areas by applying different gamma voltages to driven and non-driven areas. This allows the system to operate in partial driving mode for power savings while using local gamma voltage adjustment to maintain display quality and minimize boundary effects in the driven region.
Solution Approach 2:
The patent introduces dynamic adjustment of gamma voltages based on real-time driving mode and pixel location. The system can switch between entire and partial driving modes and dynamically adjust gamma voltages for different areas, making the display adaptive to power requirements while maintaining visual quality through localized parameter control.
3Object-affected harmful factors
If different gamma voltages are applied to minimize boundary effects, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the display area into driven and non-driven regions, applying different gamma voltage values to each segment. This segmentation approach allows independent control of optical properties for different areas, enabling boundary effect compensation through localized gamma voltage adjustment without requiring complex hardware modifications.
Solution Approach 2:
The patent manages device complexity by implementing parameter changes (gamma voltage values) through software or lookup tables rather than complex hardware circuits. By storing different gamma voltage values in memory and selecting them based on driving mode and pixel location, the patent achieves sophisticated local control with relatively simple additional components.
Data Source
AI summary
A display device includes: a plurality of pixels; a first pixel unit comprising a first portion of the plurality of pixels; a second pixel unit comprising a second portion of the plurality of pixels; and a data driver configured to supply a data voltage to the first pixel unit and the second pixel unit, wherein the data driver is configured to generate a data voltage to be supplied to the first pixel unit based on different gamma voltages even when the same grayscale is expressed according to a driving method, and the second pixel unit is configured to be driven or not driven according to the driving method.