OLED Display Panel Optical Waveguide Brightness Compensation
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Solution Overview
Problem
Current OLED display technologies face challenges in achieving uniform brightness due to nonuniformity in thin film transistors (TFTs), power voltage drops, and OLED nonuniformity, which existing compensation methods, such as electrical compensation, cannot fully address, especially for long-term use.
Innovation Solution
The proposed solution involves a display panel with an array substrate, a luminescent layer, optical film layers, and a photoelectric sensor that forms an optical waveguide. This setup allows for real-time brightness compensation by calculating brightness differences using optical waveguide data and adjusting the driving voltage to ensure uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrical compensation is used to adjust brightness, then manufacturing complexity is reduced, but brightness uniformity deteriorates due to nonuniformity in TFTs, power voltage drops, and OLED nonuniformity
Solution Approach 1:
The patent introduces an optical waveguide as an intermediary component that guides light from the OLED to a photoelectric sensor. This waveguide structure enables optical compensation by mediating between the light source and the sensing mechanism, allowing for real-time detection and correction of brightness nonuniformity without increasing manufacturing complexity
Solution Approach 2:
The patent implements a feedback mechanism where the photoelectric sensor detects brightness through the optical waveguide and provides data to a driving chip. The driving chip then adjusts driving voltages based on detected brightness levels, creating a closed-loop feedback system that continuously compensates for brightness nonuniformity caused by TFT variations and power voltage drops
2Illumination intensity
If optical compensation is used to directly measure brightness, then brightness uniformity is improved, but device complexity increases due to additional optical components
Solution Approach 1:
The patent makes the optical waveguide serve multiple functions: it acts as both a structural component of the display and a light-guiding element for sensing. This multi-functionality allows optical compensation to be implemented without adding separate dedicated sensing structures, thereby improving brightness uniformity while minimizing increases in device complexity
Solution Approach 2:
The patent enables the display structure itself to perform sensing functions through the optical waveguide. The existing optical path is utilized for both display and compensation purposes, allowing the system to self-diagnose and self-correct brightness nonuniformity without requiring external complex measurement equipment
3Illumination intensity
If real-time brightness compensation is implemented, then brightness uniformity is improved, but use of energy increases due to continuous monitoring and adjustment
Solution Approach 1:
The patent implements continuous brightness compensation through real-time optical monitoring and continuous adjustment of driving voltages. The photoelectric sensor continuously measures brightness through the optical waveguide, and the driving chip continuously adjusts compensation voltages, ensuring sustained brightness uniformity throughout operation without energy-intensive periodic recalibration
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 approach effectively improves brightness uniformity and visual performance of OLED displays by enabling real-time compensation for brightness differences, addressing limitations in current compensation methods.
Implementation Method 1
light emitted by the luminescent layer forming optical waveguide on the array substrate and/or the optical film layers
Implementation Method 2
a photoelectric sensor used for acquiring the optical waveguide to perform brightness compensation
Data Source
AI summary
The disclosure provides a display panel, a compensation of brightness method and a displaying device. The display panel comprises an array substrate, a luminescent layer, a plurality of optical film layers and a photoelectric sensor, wherein the luminescent layer is located on one side of the array substrate, the array substrate is used for driving the luminescent layer to emit light, the optical film layers are located on a side, away from the array substrate, of the luminescent layer, light emitted by the luminescent layer forms optical waveguide on the array substrate and/or the optical film layers, and the photoelectric sensor is used for acquiring the optical waveguide to perform compensation of brightness on the light emitted by the luminescent layer according to data of the optical waveguide.