Segmented Display Gamma Circuit for AOD Power Optimization
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Solution Overview
Problem
The Always On Display (AOD) function in electronic devices requires continuous image data output, leading to significant power consumption, which shortens battery life, and minimizing grayscale voltage levels compromises image quality.
Innovation Solution
A display system with a first and second group of subpixels, each connected to converters and gamma circuits that apply grayscale voltages determined by different numbers of binary bits, allowing a controller to selectively connect these circuits to manage power consumption while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If grayscale voltage levels are minimized to reduce power consumption, then power consumption decreases, but image quality deteriorates
Solution Approach 1:
The display pixels are divided into two groups: first group pixels that receive full grayscale voltages (maintaining image quality) and second group pixels that receive minimized grayscale voltages (reducing power consumption). This segmentation allows simultaneous optimization of both image quality and power consumption by applying different voltage strategies to different pixel groups.
Solution Approach 2:
Different grayscale voltage strategies are applied to different regions of the display. The first group pixels use high-precision grayscale voltages for quality-critical areas, while the second group pixels use minimized voltages for less critical areas, achieving local optimization of both quality and power consumption.
2Reliability
If AOD function operates with continuous image data output, then display functionality is maintained, but power consumption increases
Solution Approach 1:
The pixel array is segmented into two groups with different operational modes. Second group pixels operate with minimized grayscale voltages to reduce power consumption while maintaining basic display functionality, whereas first group pixels operate normally to ensure display reliability when needed.
Solution Approach 2:
Instead of applying full grayscale voltages to all pixels continuously (excessive action), the patent applies minimized voltages to the second group pixels (partial action), achieving sufficient display functionality with reduced power consumption.
Data Source
AI summary
According to various embodiments of the disclosure, a display may include a display panel including a first region in which first group subpixels are disposed and a second region in which second group subpixels are disposed, a converter group including converters respectively connected to subpixels included in the first group subpixels and the second group subpixels to transfer image data for output of specified content to the subpixels, a first group gamma circuit selectively connected to the converters to output a first grayscale voltage whose intensity is determined based on a plurality of binary bits, a second group gamma circuit selectively connected to the subpixels to output a second grayscale voltage whose intensity is determined based on a single binary bit, and a controller that controls selective connections between the first group gamma circuit and the converters and selective connections between the second group gamma circuit and the subpixels. According to an embodiment, the controller may receive the image data from an external processor and transfer the image data to the converter group, connect the first group gamma circuit with at least some converters such that the first group gamma circuit applies the first grayscale voltage to the at least some converters of the converter group, connect the second group gamma circuit with the second group subpixels such that the second group gamma circuit applies the second grayscale voltage to the second group subpixels, and output the specified content to at least a portion of the first region. In addition, various embodiments understood from the specification are possible.