Multi-line Scan LED Grayscale Switched Display Method
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Solution Overview
Problem
Multi-line scan constant-current source chips face issues with insufficient refresh rate, low grayscale levels, and poor low-grayscale effects, leading to flickering and incomplete display in LED screens, especially when a large quantity of line scans are performed.
Innovation Solution
A method and system for switched display of grayscale in multi-line scan LEDs, which involves obtaining grayscale data, adding a compensation value to offset brightness loss, dividing the data into most significant and least significant bits, and determining whether to perform scrambled or combined display based on a refresh factor and combination level, thereby achieving a high refresh rate and improved grayscale linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scrambled-PWM algorithm is used to increase refresh rate, then display refresh rate is improved, but low-grayscale display quality deteriorates (speckles, poor linearity)
Solution Approach 1:
The patent implements dynamic switching between scrambled-PWM and combined-PWM algorithms based on grayscale level. For high grayscales, scrambled-PWM provides high refresh rates, while for low grayscales, combined-PWM ensures display quality. This dynamic adaptation resolves the contradiction by optimizing the algorithm selection according to real-time display requirements.
Solution Approach 2:
The patent changes the PWM algorithm parameter (scrambled vs combined mode) based on grayscale level thresholds. By adjusting the algorithm type according to the grayscale parameter, the system achieves high refresh rates for most grayscales while maintaining quality for low grayscales, thus resolving the contradiction between refresh rate and display quality.
2Measurement precision
If multi-line scan is used to increase LED quantity on screen, then display resolution is improved, but refresh rate deteriorates (insufficient refresh rate)
Solution Approach 1:
The patent applies dynamic grayscale compensation that adapts to the multi-line scan configuration. By dynamically adjusting compensation values based on line scan number and grayscale level, the system maintains high refresh rates while supporting increased LED quantity and resolution through multi-line scanning.
Solution Approach 2:
The patent performs preliminary grayscale compensation before display output to pre-correct for the reduced conduction time caused by multi-line scanning. This preliminary action ensures that even with divided time slots from multiple line scans, the display maintains sufficient refresh rate and grayscale accuracy.
3Device complexity
If conventional PWM is used to control grayscale, then grayscale control is simple, but refresh rate deteriorates (excessively low display refresh rate)
Solution Approach 1:
The patent dynamically selects between conventional PWM and scrambled-PWM algorithms based on grayscale level and display requirements. This dynamic approach maintains the simplicity of conventional PWM for basic applications while achieving high refresh rates when needed, thus resolving the contradiction between control simplicity and refresh rate performance.
Solution Approach 2:
The patent segments the grayscale control into two modes: conventional PWM for simplicity and scrambled-PWM for high refresh rate requirements. By dividing the control strategy into distinct segments based on operational needs, the system achieves both simplicity and high performance in different scenarios.
Data Source
AI summary
The present disclosure discloses a method and system for switched display of a grayscale of a multi-line scan light-emitting diode (LED), and relates to the field of LED display technology. In view of the problems in the prior art that a multi-line scan constant-current source chip has an insufficient refresh rate, a low grayscale level, and a poor low-grayscale effect, the present disclosure provides a method during the display of relatively high grayscales, a display cycle is scrambled. During the display of relatively low grayscales, the grayscales are combined. In the present disclosure, a relatively high refresh rate and a grayscale level can still be ensured in a case of a relatively large quantity of line scans. In addition, in the case of low-grayscale display, the problems such as low-grayscale speckles, slightly dark low-grayscale, and relatively poor low-grayscale linearity are resolved, thereby improving a picture display effect.