Micro LED Data Driving Circuit Current Uniformity Control
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Solution Overview
Problem
Micro LED display screens face non-uniform brightness due to the inability to independently adjust the current output of constant-current driving chips, leading to luminance errors between regions controlled by different chips, resulting in overall display unevenness.
Innovation Solution
A data driving circuit with a voltage regulating unit that includes a switch module, current detecting module, and control module to detect and adjust the driving current of each constant-current driving unit, ensuring it stays within a preset range, thereby maintaining uniformity across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single constant-current driving chip controls the brightness of Micro LED in a local region, then the current output can be adjusted by current gain, but adjustment with the current gain can only control all constant-current driving chips with the same color in a unified manner and cannot be performed on a single constant-current driver chip, resulting in luminance error between regions
Solution Approach 1:
The patent divides the constant-current driving function into multiple independent driving chips, each capable of independent current adjustment. The voltage regulating unit is also segmented to work with each driving chip individually, allowing separate control of current parameters for each chip rather than unified control of all chips with the same color.
Solution Approach 2:
The patent implements local quality by enabling independent current adjustment for each constant-current driving chip through the voltage regulating unit. This allows different regions controlled by different chips to have optimized current parameters according to their specific requirements, improving display uniformity across the entire display screen.
2Ease of operation
If external resistance is mounted to adjust current output, then the current gain can be adjusted, but the adjustment cannot be performed on a single constant-current driver chip, resulting in luminance error between regions
Solution Approach 1:
The patent introduces a feedback mechanism where the voltage regulating unit detects the actual current output of each constant-current driving chip and adjusts the voltage accordingly to achieve the target current value. This closed-loop feedback system ensures precise current control for each individual chip, eliminating luminance errors between regions.
Solution Approach 2:
The voltage regulating unit acts as an intermediary between the control system and the constant-current driving chips. It receives control signals, detects the actual current output of each driving chip, and adjusts the voltage to achieve the target current value, enabling independent and precise current adjustment for each chip.
3Device complexity
If the same current gain is used for all constant-current driving chips with the same color, then the control is simplified, but the luminance error between regions controlled by different chips increases
Solution Approach 1:
The patent segments the control system into multiple independent control channels, each corresponding to a specific constant-current driving chip. The voltage regulating unit is divided into multiple modules, with each module responsible for regulating the current of a specific driving chip, allowing independent optimization without increasing overall system complexity.
Solution Approach 2:
Each constant-current driving chip is equipped with its own voltage regulating module that can independently detect and adjust its current output. This self-service mechanism allows each chip to autonomously achieve the target current value without requiring complex centralized control, maintaining simplicity while improving precision.
Data Source
AI summary
Provided is a data driving circuit and a display panel. The data driving circuit is configured to output a data signal for image display to multiple pixel units so as to drive the pixel units to display images. The data drive circuit includes a voltage regulating unit and multiple constant-current driving units, where the constant-current driving unit is configured to output a drive current corresponding to a data signal to at least one pixel unit. The voltage regulating unit is electrically connected to the multiple constant-current driving units and is configured to detect a driving current output by each constant-current driving unit and obtain a detection signal, and control the driving current output by each constant-current driving unit to be within a preset range according to the detection signal. The driving current output by each constant-current driving unit is adjusted.