AMOLED Pixel Photoelectric Compensation for Brightness Deviation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active Matrix Organic Light Emitting Display (AMOLED) panels experience deviations in brightness and color over time due to IR-Drop, threshold voltage shift, and material degradation, making it difficult to maintain consistent display quality.
Innovation Solution
A display panel design featuring pixel units with a pixel driving circuit, a light emitting unit, and a photoelectric converter, where the photoelectric converter receives light emitted by the light emitting unit and generates a signal for brightness compensation, allowing for real-time adjustment of data voltage to maintain optimal brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional AMOLED display is used without compensation, then device complexity is low, but brightness and color deviation occurs over time due to IR-Drop, threshold voltage shift, and material degradation
Solution Approach 1:
The photoelectric converter is integrated within the pixel unit structure, nested between the pixel defining layer and the common electrode. This nesting approach allows the compensation function to be embedded within the existing display structure without requiring separate external compensation modules, thereby improving display quality consistency while controlling device complexity.
Solution Approach 2:
The pixel defining layer serves multiple functions: it defines the pixel structure boundaries, provides electrical insulation, and acts as a light transmission window for the photoelectric converter. This multi-functionality reduces the need for additional separate components, addressing the contradiction between reliability improvement and device complexity.
2Measurement precision
If a photoelectric converter is added to each pixel unit for real-time compensation, then brightness compensation precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The photoelectric converter shares the same pixel defining layer and via hole structure with the light emitting unit. The pixel defining layer's via hole serves both to connect the light emitting unit to the pixel electrode and to position the photoelectric converter. This merging of structures simplifies the manufacturing process while maintaining brightness detection precision.
Solution Approach 2:
The photoelectric converter uses the light emitted by its own pixel's light emitting unit for detection, eliminating the need for external light sources or complex illumination systems. This self-service approach simplifies manufacturing while achieving precise brightness measurement for compensation.
3Measurement precision
If the photoelectric converter is positioned to directly receive light from the light emitting unit, then compensation accuracy is improved, but the pixel defining layer must be more complex to allow light transmission
Solution Approach 1:
The pixel defining layer has different optical properties in different regions: it is opaque in most areas to define pixel boundaries and provide insulation, but has a light-transmitting portion (light transmission window) specifically at the via hole region to allow light passage to the photoelectric converter. This local quality differentiation achieves precise light detection without requiring the entire pixel defining layer to be complex or transparent.
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 comprehensive compensation for brightness deviations, ensuring consistent and stable display quality by using a photoelectric converter to detect light intensity and adjust data voltage accordingly, addressing limitations in existing compensation methods.
Implementation Method 1
a photoelectric converter configured to receive the light emitted by the light emitting unit
Data Source
AI summary
The present disclosure provides a display panel and a method for manufacturing the same, a pixel light emitting compensation method, and a display apparatus. The display panel comprises a plurality of pixel units arranged in an array, wherein each of the pixel units comprises: an array substrate comprising a pixel driving circuit; a pixel defining layer disposed on a first surface of the array substrate and having a via hole wherein the first surface is far away from a substrate of the array substrate; a light emitting unit disposed in the via hole, wherein the light emitting unit is electrically connected to an output terminal of the pixel driving circuit, so that driving current output by the pixel driving circuit drives the light emitting unit to emit light; and a photoelectric converter configured to receive the light emitted by the light emitting unit.