OLED Display Panel Optical Feedback for Brightness Consistency
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Solution Overview
Problem
Existing OLED display technologies face challenges in maintaining consistent light emission brightness due to factors like threshold voltage drift, current shift, and mobility changes in thin film transistors, which current compensation methods cannot fully address.
Innovation Solution
A display panel with an optical compensation device integrated into the counter substrate, featuring actual light emitting brightness value detectors and a compensation circuit that adjusts brightness in real time by detecting actual brightness values and comparing them to target values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current compensation methods are used to adjust brightness, then some brightness adjustment is achieved, but brightness inconsistency remains due to threshold voltage drift, current shift, and mobility changes in thin film transistors
Solution Approach 1:
The patent replaces electrical current-based compensation methods with optical detection methods. Photosensors are used to detect actual light emitting brightness values, and this optical detection approach substitutes the inadequate electrical compensation mechanism, enabling more accurate brightness measurement and compensation.
Solution Approach 2:
The patent implements a feedback mechanism where photosensors continuously detect actual brightness values, compare them with target brightness values, and adjust driving currents accordingly. This closed-loop feedback system compensates for threshold voltage drift, current shift, and mobility changes in real-time, significantly improving brightness consistency.
2Reliability
If photosensors are integrated into the counter substrate for real-time brightness detection, then brightness consistency is improved, but device complexity increases
Solution Approach 1:
The patent merges the photosensor array into the counter substrate, integrating multiple functions (display and brightness detection) into a single substrate structure. This integration reduces the need for separate detection components and simplifies the overall device architecture despite the added functionality.
Solution Approach 2:
The counter substrate is designed to serve multiple functions: it acts as both the display counter substrate and the brightness detection substrate. By making the counter substrate universal for both purposes, the patent avoids adding separate detection substrates, thereby limiting the increase in device complexity.
3Measurement precision
If separate light shield is added for sensor array, then sensor detection accuracy is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the light shield function with the color filter layer, merging two separate components into one. The color filter layer simultaneously performs its primary function of filtering light for color display and provides the light shield function to prevent stray light from reaching photosensors, thereby improving detection accuracy without adding separate manufacturing steps.
Solution Approach 2:
The color filter layer is designed to serve dual purposes: color filtering for display and light shielding for sensor protection. This multi-functional design eliminates the need for a separate light shield component, simplifying manufacturing while maintaining sensor detection accuracy.
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 enables real-time adjustment of light emitting brightness values, effectively addressing issues of brightness inconsistency and improving the overall display performance by maintaining target brightness levels.
Implementation Method 1
a plurality of photosensors respectively connected to the plurality of second thin film transistors and respectively in the plurality of subpixel areas, the plurality of photosensors being configured to detect actual light emitting brightness values
Data Source
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AI summary
The present application provides a display panel having a plurality of subpixels. The display panel includes an array substrate including an array of a plurality of first thin film transistors respectively in the plurality of subpixels for driving light emission of the display panel; a counter substrate facing the array substrate and having a plurality of subpixel areas respectively in the plurality of subpixels; and an optical compensation device for adjusting in real time actual light emitting brightness values of the plurality of subpixel areas to target brightness values. The optical compensation device includes a plurality of actual light emitting brightness value detectors integrated in the counter substrate and respectively in the plurality of subpixel areas.