Micro-LED Pixel Drive Circuit Current Density Control
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Solution Overview
Problem
Micro-LEDs in display panels face challenges in accurately controlling luminance and gray scales, and their working stability is poor, limiting user experience due to inadequate control over luminance and current density.
Innovation Solution
A pixel drive circuit is proposed, comprising a Micro-LED with a grounded cathode, a light-emitting control circuit for controlling emission time, and a current control circuit that maintains a preset current density, ensuring the Micro-LED operates in a high current density region for improved efficiency and stability, and a light-emitting control circuit for precise control of emission time using pulse width control methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional driving methods are used for Micro-LED, then device complexity is reduced, but luminance and gray scale control precision deteriorates
Solution Approach 1:
The pixel drive circuit is divided into distinct functional modules: a current control circuit with first and second control circuits to regulate current density, and a light-emitting control circuit with third and fourth control circuits to manage emission timing. This segmentation allows independent optimization of current control precision and emission timing, achieving accurate luminance and gray scale control without excessive overall complexity.
Solution Approach 2:
The circuit employs dynamic control mechanisms where the current control circuit adjusts current density in real-time based on operational conditions, and the light-emitting control circuit dynamically regulates emission timing. This dynamic adaptation enables precise luminance control across different gray levels while maintaining circuit efficiency.
2Reliability
If conventional driving methods are used for Micro-LED, then circuit simplicity is maintained, but working stability deteriorates
Solution Approach 1:
The circuit is segmented into specialized control blocks: the current control circuit (with first control circuit for current regulation and second control circuit for timing) and the light-emitting control circuit (with third control circuit for emission control and fourth control circuit for timing). Each segment handles specific functions independently, improving working stability through dedicated control while keeping overall circuit complexity manageable through modular design.
Solution Approach 2:
The current control circuit incorporates feedback mechanisms to maintain stable current density by monitoring and adjusting the current based on operational conditions. This feedback control ensures consistent luminous efficiency and working stability, preventing drift in current density that would otherwise degrade performance over time.
3Use of energy by moving object
If current density is not precisely controlled, then circuit complexity is reduced, but luminous efficiency deteriorates
Solution Approach 1:
The current control circuit dynamically adjusts current density to maintain optimal operating conditions for the Micro-LED. By continuously adapting the current level based on emission requirements and device characteristics, the circuit maximizes luminous efficiency without requiring overly complex control mechanisms, achieving efficient energy utilization through intelligent current management.
Data Source
AI summary
The present disclosure discloses a pixel drive circuit and a display panel. The pixel drive circuit includes a Micro-LED, a cathode of which is grounded; a light-emitting control circuit connected with an anode of the Micro-LED and configured to control an emission time of the Micro-LED; a current control circuit connected with the light-emitting control circuit and configured to output a preset current to the light-emitting control circuit to control the Micro-LED to work under a set current density, and luminance efficiency of the Micro-LED under the set current density is greater than a set threshold value.