Pixel Circuit Light Correction for Display Degradation
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Solution Overview
Problem
Existing display devices struggle to maintain image quality due to variations in light emission from pixels, particularly as the light emitting devices degrade over time.
Innovation Solution
A display device is designed with a light receiving device and a masking transistor that corrects the quantity of light emitted by each pixel, using a masking signal to adjust the light output based on degradation data calculated for different areas of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting devices are used to display images, then image information can be provided to users, but the light emission quantity varies and degrades over time, causing image quality deterioration
Solution Approach 1:
The patent implements a feedback mechanism where a light receiving device measures the actual light emission quantity from each pixel, and this measurement is used to generate correction values that adjust the driving signals. This closed-loop feedback system continuously compensates for light emission variations and degradation, maintaining image quality consistency throughout the device's operational lifespan.
Solution Approach 2:
The patent changes the electrical parameters (voltage or current) of the driving signal based on measured light emission characteristics. By adjusting the driving signal parameters according to the light receiving device's measurements, the system compensates for degradation and maintains consistent image quality over time.
2Reliability
If correction mechanisms are added to maintain image quality, then image quality consistency is improved, but device complexity increases
Solution Approach 1:
The patent merges the light receiving device and correction transistor into the existing pixel structure. Instead of adding completely separate correction systems, the invention integrates these functions within the pixel circuit itself, sharing common elements like the reference node and existing transistor structures, thereby reducing overall device complexity.
Solution Approach 2:
The light receiving device serves multiple functions: it measures light emission for correction purposes, and its output is used to control the masking transistor for image quality adjustment. This multi-functionality reduces the need for separate dedicated components, simplifying the overall device architecture.
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
This solution ensures that the display device maintains excellent image quality by uniformly correcting light output across pixels, even as degradation occurs, thereby enhancing display quality and consistency.
Implementation Method 1
a light receiving device, which is connected between a bias line for receiving a bias voltage and the reference node, and receive the light
Data Source
AI summary
Provided is a display device comprising a display panel including a plurality of pixels, one of the pixels includes a light emitting device, which is connected with a reference node to emit light, and a driving transistor connected between a power line, which is to receive a power supply voltage, and the reference node, a scan transistor, which is connected between a data line to receive a data signal and the driving transistor and receives a scan signal, a light receiving device, which is connected between a bias line to receive a bias voltage and the reference node, and receives the light, and a masking transistor which is connected between the reference node and the light receiving device and receives a masking signal.