Display Substrate Brightness Compensation Using Auxiliary LED Units
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Solution Overview
Problem
LEDs experience reduced light emitting efficiency and stability due to temperature rise and high current density, leading to brightness attenuation.
Innovation Solution
A display substrate with a compensation circuit that detects brightness or temperature and controls an auxiliary light emitting unit to compensate for reduced brightness, using a main and auxiliary light emitting unit configuration with separate drive circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED operates at high current density to achieve high brightness, then brightness is improved, but light emitting efficiency and stability deteriorate due to temperature rise
Solution Approach 1:
The pixel unit is divided into two independent light emitting units: a main light emitting unit for primary brightness output and an auxiliary light emitting unit for compensation. This segmentation allows the main unit to operate at high current density for high brightness while the auxiliary unit compensates for efficiency loss, resolving the contradiction between brightness and reliability
Solution Approach 2:
A compensation circuit is implemented that detects the brightness or temperature of the pixel unit and uses this feedback to control the auxiliary light emitting unit. The circuit dynamically adjusts the auxiliary unit's emission based on detected parameters, compensating for efficiency attenuation caused by temperature rise and maintaining overall brightness stability
2Illumination intensity
If temperature rises during LED operation to maintain brightness, then brightness is maintained, but light emitting efficiency deteriorates
Solution Approach 1:
The temperature rise, which normally causes efficiency attenuation, is converted into a useful signal. The compensation circuit detects temperature or brightness changes and uses this information to activate the auxiliary light emitting unit, transforming the harmful thermal effect into a trigger for compensation that restores efficiency
Solution Approach 2:
The system changes operational parameters by introducing a second light emitting unit with different operational characteristics. When temperature rises and main unit efficiency drops, the auxiliary unit is activated with optimized parameters to compensate, effectively changing the system's operational state to maintain efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves brightness stability by compensating for attenuation due to temperature rise, enhancing display performance.
Implementation Method 1
The detection circuit is configured to detect the brightness or temperature of the at least one pixel unit
Data Source
AI summary
A display substrate (910), comprising a plurality of pixel units (P11, P12, P21, P22) and at least one compensation circuit. At least one pixel unit (P11, P12, P21, P22) comprises: a main light-emitting unit and an auxiliary light-emitting unit; and the at least one compensation circuit is connected to the auxiliary light-emitting unit of the at least one pixel unit (P11, P12, P21, P22). The at least one compensation circuit is configured to measure the brightness or temperature of the at least one pixel unit (P11, P12, P21, P22) and control the auxiliary light-emitting unit of the at least one pixel unit (P11, P12, P21, P22) to emit light according to a measurement result.