Micro LED Driving Method Analog Digital Gray-Scale Control
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Solution Overview
Problem
Light-emitting devices using micro LEDs face challenges in controlling gray-scales, particularly at low gray-scales, leading to reduced image quality and difficulty in increasing the number of gray-scales due to limitations in current control methods and time division control methods.
Innovation Solution
A driving method that combines analog and digital control methods by dividing the frame period into sub-frame periods for analog and digital gray-scale data writing, allowing for precise control of light emission and non-emission periods to enhance gray-scale resolution and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current control method is used to control gray-scales, then gray-scale control is achieved, but image quality deteriorates at low gray-scales and the number of gray-scales cannot be increased
Solution Approach 1:
The frame period is divided into multiple sub-frame periods, with different sub-frames dedicated to different control methods. Specifically, some sub-frames use analog gray-scale data while others use digital gray-scale data, allowing the system to leverage the strengths of both methods without compromising overall image quality
Solution Approach 2:
The patent combines analog and digital control methods into a unified driving system. By merging the analog gray-scale control (which provides precise low gray-scale control) with digital gray-scale control (which ensures stable image quality), the system achieves both precise gray-scale control and high image quality simultaneously
2Adaptability or versatility
If time division control method is used to increase number of gray-scales, then more gray-scales can be displayed, but image quality deteriorates due to control limitations
Solution Approach 1:
The time division control is segmented into multiple sub-frame periods within one frame period. Each sub-frame can independently use digital gray-scale data, allowing the system to display more gray-scales (up to 256 levels) while maintaining image quality through the structured temporal division
Solution Approach 2:
The system employs periodic action by cycling through different sub-frame periods with different gray-scale control methods. This periodic structure allows the display to present multiple gray-scale levels over time while maintaining stable image quality in each individual sub-frame
3Measurement precision
If analog gray-scale data is written to all sub-frame periods, then precise gray-scale control is achieved, but the number of displayable gray-scales is limited
Solution Approach 1:
The frame period is segmented into multiple sub-frame periods, with each sub-frame capable of receiving and displaying different gray-scale data. This segmentation allows the system to use analog gray-scale data in some sub-frames for precise control while using digital gray-scale data in other sub-frames to expand the total number of displayable gray-scales across the entire frame period
Data Source
AI summary
A driving method of a light emitting device includes that the light emitting device has a plurality of pixels and performs gray-scale display in sections of the sub-frame periods in which one frame period for displaying one frame image is divided into a plurality of sub-frame periods. The driving method includes writing analog gray-scale data to the plurality of pixels to display analog gray-scales in one sub-frame period of the plurality of sub-frame periods, and writing first digital gray-scale data to the plurality of pixels to display first digital gray-scales in a sub-frame period of the same length as the one sub-frame period, and in a sub-frame period different from the one sub-frame period.