Dummy Pixel Circuit Voltage Detection for Display Brightness Compensation
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Solution Overview
Problem
Display devices face challenges in maintaining display quality due to the degradation of electronic components over time, as the degradation speed of light-emitting elements varies with driving time and cannot be accurately predicted, leading to brightness attenuation.
Innovation Solution
A driving method that uses a dummy pixel circuit to detect voltage changes and adjust the driving signal based on the degradation characteristics, allowing for real-time compensation to maintain optimal brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the display device operates continuously, then the display duration increases, but the light-emitting element degrades causing brightness attenuation
Solution Approach 1:
The patent implements a feedback mechanism where the detection circuit continuously monitors the voltage change across the light-emitting element during operation. This detected voltage change is fed back to the processor, which then adjusts the driving signal in real-time to compensate for the degradation, thereby maintaining consistent brightness over extended display duration.
Solution Approach 2:
The patent dynamically changes the driving signal parameters (voltage or current) based on the detected degradation level. By adjusting the magnitude of the driving signal according to the voltage change detected during operation, the system compensates for light-emitting element aging and maintains optimal brightness without requiring manual intervention.
2Measurement precision
If a detection circuit is added to monitor voltage changes, then the compensation precision improves, but the device complexity increases
Solution Approach 1:
The patent merges the detection circuit with the existing pixel circuit structure, where the detection circuit shares common elements such as power supply lines, signal transmission paths, and processing units with the display pixel circuits. This integration approach enables degradation monitoring without adding completely separate functional modules, thus minimizing the increase in device complexity while maintaining measurement precision.
3Illumination intensity
If the driving signal is adjusted in real-time, then the display quality is maintained, but the energy consumption increases
Solution Approach 1:
The patent employs periodic detection and adjustment cycles rather than continuous real-time modification. The detection circuit monitors voltage changes at specific intervals during operation, and the processor adjusts the driving signal periodically based on these measurements. This periodic approach maintains display quality while reducing energy consumption compared to truly continuous adjustment.
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
Effectively compensates for the degradation of light-emitting elements, ensuring consistent display quality by dynamically adjusting the driving signal according to the detected voltage changes and stored degradation models, thereby extending the lifespan of the display device.
Implementation Method 1
driving the display pixel circuit according to the driving signal Vdata, so that the light-emitting element 220 emits light
Implementation Method 2
configured to detect a detection voltage change value across the light-emitting element 220
Data Source
AI summary
A driving method includes the following steps: driving a first dummy pixel circuit according to a first test signal, and driving a display pixel circuit according to a driving signal, wherein the first test signal is maintained at a value corresponding to a first gray level; detecting a detection voltage change value cross a light-emitting element in the display pixel circuit is driven for a driving time, and detecting a first test voltage change value cross a light-emitting element in the first dummy pixel circuit is driven for the driving time; and adjusting the driving signal according to the detection voltage change value, the first test voltage change value and a second test voltage change value, wherein the second test voltage change value is obtained by detecting a second dummy pixel circuit or from a memory unit.