OLED Pixel Compensation Using Integrated Photo Sensing Pixels
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Solution Overview
Problem
Display devices with organic light emitting diodes (OLEDs) suffer from degradation, leading to pixels emitting light at lower than target luminance, and existing compensation methods are not accurate.
Innovation Solution
A method involving a pixel and a photo sensing pixel, where light is emitted and reflected to a photo sensing pixel for differential data calculation, allowing for accurate compensation of degradation by comparing sensing data and baseline data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If organic light emitting diodes are used in display devices, then the display device can emit light with good color and efficiency, but the light emitting element degrades over time causing pixels to emit light at lower than target luminance
Solution Approach 1:
The patent implements a feedback mechanism where sensing pixels detect the actual luminance output of light emitting pixels, and this sensing data is used to calculate compensation values that adjust the driving signals. This closed-loop feedback system continuously monitors and corrects for OLED degradation, maintaining target luminance despite the inherent instability of organic light emitting materials over time.
Solution Approach 2:
The display device uses its own integrated sensing pixels to monitor its performance rather than requiring external measurement equipment. The sensing pixels are part of the display panel itself, enabling the system to self-diagnose and self-correct its luminance output through automated compensation algorithms, making the system self-maintaining without additional external hardware.
2Reliability
If existing compensation methods are used, then some degradation compensation can be achieved, but the compensation accuracy is insufficient to maintain target luminance
Solution Approach 1:
The patent introduces sensing pixels as intermediary elements that directly measure the light output of light emitting pixels. These sensing pixels act as mediators between the light emitting elements and the control system, providing accurate real-time luminance data that enables precise compensation calculations, thereby solving the measurement precision problem of existing compensation methods.
Solution Approach 2:
The patent replaces traditional external luminance measurement instruments with integrated photonic sensing pixels that are part of the display panel structure. This substitution enables direct optical measurement at the pixel level without mechanical contact or external equipment, achieving higher measurement precision and enabling real-time compensation.
3Measurement precision
If additional hardware is added to improve degradation compensation accuracy, then measurement precision can be improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the sensing function and display function into a single integrated panel structure. The sensing pixels are fabricated alongside the light emitting pixels in the same OLED layer, combining measurement and display capabilities in one unified device. This integration eliminates the need for separate external sensing hardware, reducing device complexity while maintaining high measurement precision.
Solution Approach 2:
The display panel serves multiple functions simultaneously: it displays images through light emitting pixels and measures luminance through sensing pixels. This multi-functional design allows the same physical structure to perform both display and sensing tasks, eliminating the need for additional dedicated sensing hardware and reducing overall device complexity.
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
Accurate compensation of OLED degradation is achieved, improving display quality by ensuring pixels emit light at target luminance without additional hardware costs.
Implementation Method 1
performing a first sensing operation of emitting light by the pixel and operating the photo sensing pixel
Implementation Method 2
Some of the light emitted from the pixel may be reflected inside the display device to reach the photo sensing pixel located adjacent to the pixel
Data Source
AI summary
A method of driving a display device is disclosed in which the display device includes a pixel and a photo sensing pixel. The method includes: performing a first sensing operation of emitting light by the pixel and operating the photo sensing pixel; performing a second sensing operation of not emitting light by the pixel and operating the photo sensing pixel; and calculating a compensation value for compensating degradation of the pixel based on first sensing data according to the first sensing operation and second sensing data according to the second sensing operation.