Array Substrate Photosensitive Detection for OLED Luminance Calibration
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Solution Overview
Problem
Organic light-emitting diode (OLED) display apparatuses face challenges in maintaining consistent luminance due to threshold voltage drift and electron mobility fluctuations in driving transistors, leading to deviations from target luminance and suboptimal image display quality.
Innovation Solution
An array substrate with integrated photosensitive detection assemblies, comprising a photosensitive element and a signal reading element, detects luminance deviations and outputs signals for calibration, allowing for accurate adjustment of data voltage to compensate for these fluctuations, ensuring consistent luminance across sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driving transistors are used to control sub-pixel luminance, then the display can be driven with simple circuitry, but threshold voltage drift and electron mobility fluctuations cause luminance deviations
Solution Approach 1:
The patent implements a feedback mechanism by introducing photosensitive detection assemblies that detect the actual luminance output of each sub-pixel and feed this information back to a control circuit. The control circuit then adjusts the data voltage applied to each sub-pixel based on the detected luminance, compensating for threshold voltage drift and electron mobility fluctuations in the driving transistors. This closed-loop feedback system maintains luminance consistency without requiring more complex transistor designs.
2Measurement precision
If photosensitive detection assemblies are added to detect luminance, then luminance calibration accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the photosensitive detection assembly with the existing pixel structure by integrating the photosensitive element, signal reading element, and control circuitry into the same pixel region. The detection assembly shares physical space and electrical connections with the driving transistor and light-emitting device, allowing luminance detection without adding separate external components. This integration minimizes structural complexity while enabling accurate luminance measurement for calibration.
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 quick and accurate detection and calibration of sub-pixel luminance, improving display quality by compensating for manufacturing variations and aging effects, thereby ensuring consistent and optimal image output.
Implementation Method 1
a photosensitive element configured to detect a luminance of a corresponding sub-pixel, and output a light detection signal according to the luminance of the corresponding sub-pixel
Data Source
AI summary
An array substrate includes a plurality of sub-pixels and at least one light photosensitive detection assembly, and each photosensitive detection assembly corresponds to at least one sub-pixel. The at least one photosensitive detection assembly includes: a photosensitive element and a signal reading element coupled to the photosensitive element and a first reading signal line, the photosensitive element is configured to detect a luminance of a corresponding sub-pixel, and output a light detection signal according to the luminance of the corresponding sub-pixel. The signal reading element is configured to read the light detection signal output by the photosensitive element, and output a first detection signal to the first reading signal line according to the light detection signal.