Photoelectric Sensor Screen Luminance Uniformity Detection
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Solution Overview
Problem
Current OLED screen brightness uniformity detection methods are inconvenient and costly, requiring special equipment for initial testing, and fail to address long-term brightness non-uniformity issues due to pixel degradation.
Innovation Solution
A method using a photoelectric sensor to detect light intensity reflected from a non-opaque cover plate on an OLED screen, determining pixel uniformity by comparing acquired light intensity with pre-stored values and adjusting driving current or voltage to compensate for non-uniformity, while also considering ambient light and pixel arrangement for efficient detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical acquisition method using CCD is used to detect illumination uniformity, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The photoelectric sensor serves multiple functions: it detects both the light intensity from display pixels and the ambient light intensity. By integrating these two detection functions into a single sensor, the patent eliminates the need for separate detection devices, reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent uses the display device's own photoelectric sensor to detect its own pixel light intensity. This self-detection approach eliminates the need for external specialized detection equipment like CCD cameras, reducing device complexity and enabling continuous self-monitoring of illumination uniformity.
2Measurement precision
If CCD is used for detection, then measurement precision is improved, but ease of operation deteriorates due to special equipment requirements
Solution Approach 1:
The display device performs self-detection using its integrated photoelectric sensor, eliminating the need for external specialized equipment and operators. The device can autonomously detect pixel light intensity and ambient light, making the operation simple and convenient while maintaining accurate measurement.
Solution Approach 2:
The patent implements a feedback mechanism where the photoelectric sensor continuously detects light intensity, compares it with reference values, and triggers compensation adjustments when deviations are detected. This automated feedback loop simplifies operation by eliminating manual detection and analysis processes.
3Manufacturing precision
If initial detection before delivery is performed, then manufacturing precision is improved, but reliability deteriorates due to inability to detect long-term degradation
Solution Approach 1:
The patent enables continuous detection of illumination uniformity throughout the product's lifecycle by integrating the photoelectric sensor into the display device. This allows ongoing monitoring of pixel degradation and continuous compensation, maintaining reliability over time rather than relying solely on initial manufacturing quality.
Solution Approach 2:
The automated feedback mechanism continuously monitors light intensity and triggers compensation when deviations occur, enabling the system to adapt to long-term pixel degradation. This transforms the one-time manufacturing quality check into an ongoing reliability assurance mechanism.
4Productivity
If multiple pixels are lit simultaneously, then productivity is improved, but measurement precision deteriorates due to light interference
Solution Approach 1:
The patent separates the detection of pixel light intensity from ambient light by taking out the ambient light component as a distinct measurement. The photoelectric sensor first measures ambient light intensity, then measures total light intensity (pixel + ambient), and finally extracts the pixel light intensity by subtracting the ambient component. This allows simultaneous lighting of multiple pixels while maintaining measurement precision through mathematical separation of light sources.
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 method allows for convenient and efficient detection of screen brightness uniformity, reducing maintenance needs and improving user experience by identifying and compensating for uneven pixel illumination in real-time.
Implementation Method 1
acquiring, by a photoelectric sensor, intensity of light emitted from the pixel that is reflected by a non-opaque cover plate of the screen
Data Source
AI summary
A method for detecting luminance uniformity of a screen, storage medium, and electronic device are provided. The method includes the following steps. At least one pixel on a display panel of a screen is lit. Light intensity of the pixel reflected by a non-opaque cover plate is acquired by a photoelectric sensor of the screen. Whether the pixel is uniformly luminous based on the acquired light intensity is determined. In this solution, by adding a photoelectric sensor to the screen, it is convenient to obtain the light condition of the screen, and then it is convenient to obtain whether the pixel is uniformly luminous.