Source Driver Overdrive Voltage for LCD Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face challenges in reducing power consumption due to inadequate driving voltage capability, leading to uneven gray levels and increased power consumption as pixels farther from the source driver require stronger charging/discharging capabilities, which results in higher power consumption.
Innovation Solution
A display apparatus and driving method that utilize a first overdrive voltage with multiple voltage levels based on pixel positions, reducing the power consumed by data lines by maintaining weaker charge driving capabilities for near pixels and regular capabilities for far pixels, thereby optimizing power usage without compromising display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the driving voltage output by the source driver is increased to ensure proper voltage levels for pixels farther from the source driver, then the display quality is improved, but the power consumption of the source driver increases
Solution Approach 1:
The patent applies local quality by providing different overdrive voltage levels to different pixel groups based on their positions in the pixel array. Specifically, pixels are divided into multiple groups, and each group receives a tailored overdrive voltage level that matches its distance from the source driver, thereby optimizing power consumption while ensuring proper voltage levels for each local region without uniformly increasing power across the entire display.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the overdrive voltage level based on pixel position. The source driver changes the voltage parameter according to which pixel group is currently being scanned, applying higher overdrive voltages to distant pixels that need them and lower voltages to nearby pixels, thus resolving the contradiction between display quality and power consumption.
2Manufacturing precision
If the driving capability is increased to compensate for voltage attenuation on data lines, then the voltage level at distant pixels is improved, but the power consumption increases due to repeated charging/discharging operations
Solution Approach 1:
The patent addresses this contradiction by applying local quality through position-dependent overdrive voltage levels. Each pixel group receives a customized voltage level that compensates exactly for the voltage attenuation expected at that distance, avoiding unnecessary overdriving of nearby pixels and reducing overall charging/discharging operations while maintaining accurate voltage levels at all positions.
3Device complexity
If a single overdrive voltage level is used for all pixels, then the device complexity is reduced, but the display quality deteriorates due to uneven gray levels across different pixel positions
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through multiple pixel groups, each receiving a specific overdrive voltage level tailored to its position. This approach maintains relatively simple device structure while achieving uniform gray levels across the display by compensating for position-dependent voltage attenuation through localized voltage adjustments.
Data Source
AI summary
A display apparatus and a driving method for the display apparatus are provided. The display apparatus includes a display panel and a first source driver. The display panel has a pixel array. The first source driver sequentially supplies a first overdrive voltage and a driving voltage to a pixel in the pixel array. The first overdrive voltage has a plurality of voltage levels according to positions of pixels in the pixel array.