Display Panel Current Control via Block Load Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices fail to control the current of a display panel effectively, leading to inconsistent light emission luminance due to varying gray level distributions in image data, resulting in suboptimal power consumption and luminance output.
Innovation Solution
A display device and method that control the current of a display panel by considering light emission efficiency based on gray levels and positions, utilizing a controller with blocks for gray-data voltage storage, block load gain extraction, and current control to determine a scale factor for adjusting input image data, ensuring desired luminance while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If current control is applied uniformly to the display panel, then power consumption is reduced, but luminance consistency deteriorates due to varying light emission efficiency across gray levels and positions
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple pixel blocks and assigning different block load gain values to each block based on its specific gray level distribution characteristics. This allows each region to be controlled according to its local light emission efficiency, achieving both power savings and luminance consistency.
Solution Approach 2:
The patent segments the display panel into multiple pixel blocks for independent analysis and control. By calculating separate block loads and block representative gray levels for each segment, the system can apply differentiated current control strategies to different regions, resolving the contradiction between uniform power reduction and localized luminance requirements.
2Illumination intensity
If current is increased to maintain desired luminance, then luminance output is improved, but power consumption increases
Solution Approach 1:
The patent changes the control parameter from uniform current control to differentiated block load control based on gray level distributions. By introducing block load gain as a new parameter that reflects local light emission efficiency, the system achieves desired luminance output only where needed, avoiding unnecessary power consumption in regions with adequate emission efficiency.
Solution Approach 2:
The patent implements feedback by using the calculated block representative gray levels and block loads to adjust the data voltages applied to each pixel block. This closed-loop approach ensures that luminance output meets requirements while minimizing power consumption through precise current control based on actual emission characteristics.
3Device complexity
If conventional current control is used without considering gray level distribution, then device complexity is reduced, but luminance accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating block representative gray levels and block load gains for each pixel block before actual display operation. This preparation step stores gray-data voltage information that characterizes each block's light emission efficiency, enabling accurate luminance control without adding complex real-time computation requirements.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a current sensor connected to the display panel, a controller including a gray-data voltage storing block, a block load gain extracting block, a block load generating block, a final load generating block, a current control block and a data correction block, and a data driver providing data voltages to the plurality of pixels based on the output image data.