LED Driving Circuit Bit-Order Current Segmentation
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Solution Overview
Problem
High refresh rate LED display systems face challenges in maintaining display quality due to the short cycle length, which is not long enough to display a full range of gray levels, leading to degraded multi-bit display data representation.
Innovation Solution
A driving circuit and method that utilize multiple sub-driving circuits and switching circuits to supply driving currents to light sources in a time-divisional manner, with current values corresponding to bit orders of pixel data, allowing for improved display quality by ensuring sufficient time for each bit to contribute to the pixel luminance, and incorporating additional sub-driving circuits and current summation/transfer circuits for higher data resolutions and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the refresh rate of the display system is increased, then the productivity is improved, but the display quality deteriorates due to insufficient cycle length to display full range of gray levels
Solution Approach 1:
The patent divides the display of pixel data into multiple sub-periods, where each sub-period corresponds to a sub-driving circuit. For an 8-bit display data, the cycle is divided into 8 sub-periods, with each sub-period dedicated to driving light sources according to a specific bit of the pixel data. This segmentation allows each bit to be displayed with sufficient time even at high refresh rates, resolving the contradiction between high productivity (refresh rate) and display quality.
2Productivity
If the cycle length is decreased to accommodate higher refresh rate, then the productivity is improved, but the duration of action of moving object is reduced, leading to insufficient time for light sources to respond
Solution Approach 1:
The patent segments the display cycle into multiple sub-periods, each sub-period being allocated to display a specific bit of pixel data. This segmentation allows the total display time to be distributed across multiple smaller time intervals, enabling high refresh rates while ensuring each sub-period has sufficient duration for light sources to respond properly.
3Manufacturing precision
If multiple sub-driving circuits are used to drive light sources according to bit order, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The patent divides the driving function into multiple sub-driving circuits, where each sub-driving circuit corresponds to a specific bit of pixel data. This segmentation enables precise control of light sources for each bit, improving display quality. The complexity is managed through systematic organization where each sub-driving circuit follows the same basic structure, making the increased complexity predictable and manageable.
Solution Approach 2:
The patent designs sub-driving circuits that can be universally applied for driving light sources corresponding to different bits of pixel data. Each sub-driving circuit is configured to receive control signals and drive light sources according to its assigned bit, creating a modular universal structure that improves display quality while keeping the complexity increase manageable through reuse of similar circuit designs.
Data Source
AI summary
A driving circuit that includes a plurality of sub-driving circuits and a plurality of first switching circuits is introduced. The sub-driving circuits is configured to supply a plurality of driving currents to drive a first group of light sources to emit light to form a first pixel on a display medium. The first switching circuits are respectively coupled to the sub-driving circuits and are configured to control the plurality of sub-driving circuits to supply the driving currents to the first group of light sources according to the pixel data, wherein a current value of each of the plurality of driving currents is corresponding to a bit order of a respective bit of the pixel data.