Optical Compensation Device for Display Luminance Uniformity
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Solution Overview
Problem
Display devices often suffer from non-uniform luminance due to variations in electrical characteristics and light emitting elements, and existing optical compensation devices can exacerbate this issue with excessive compensation in certain areas, failing to improve luminance uniformity effectively.
Innovation Solution
An optical compensation device that measures luminance at reference and neighboring points on a display panel, generates compensation data by calculating scaling values based on photographed and measurement data, and applies this data to improve luminance uniformity while preventing vignetting distortions caused by camera characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical compensation is performed using only camera photographed data, then the compensation process is simple, but vignetting distortion occurs and luminance uniformity cannot be improved
Solution Approach 1:
The patent combines two different measurement approaches: camera photographed data and photometer measurement data. The compensation value is calculated by merging these two data sources, where the camera captures overall luminance distribution and the photometer provides accurate reference point measurements. This combination allows the system to achieve both operational simplicity and luminance uniformity improvement by utilizing the strengths of each measurement method while compensating for their individual weaknesses.
2Ease of operation
If compensation is applied to all pixels uniformly, then the process is straightforward, but excessive compensation occurs in partial areas leading to worsened luminance uniformity
Solution Approach 1:
The patent implements local quality by calculating different compensation values for different regions of the display panel. The compensation value for each pixel is determined by its specific location relative to the reference point and the neighboring point. This allows the system to apply appropriate compensation intensity to each local area, preventing excessive compensation in certain regions while ensuring adequate compensation in others, thereby achieving improved luminance uniformity across the entire panel.
3Device complexity
If camera photographed data is used directly for compensation, then no additional measurement is needed, but distortion due to camera characteristics prevents luminance uniformity improvement
Solution Approach 1:
The patent introduces the photometer measurement data as an intermediary element that mediates between the camera photographed data and the final compensation calculation. The photometer provides accurate reference point luminance measurements that serve as a mediator to correct the vignetting distortion inherent in camera photographs. This intermediary measurement allows the system to eliminate camera characteristic distortions while maintaining a relatively simple measurement system configuration.
Data Source
AI summary
An optical compensation device includes a measurement part that measures a luminance of a reference point of a display panel displaying an image and a luminance of a neighboring point separated from the reference point to generate measurement data, a camera that photographs a surface of the display panel to generate a photographed image, and a compensation part that generates a scaling value of the neighboring point based on the measurement data of the reference point, a photographed data generated based on the photographed image of the reference point, the measurement data of the neighboring point, and a photographed data generated based on the photographed image of the neighboring point, and generates compensation data of the neighboring point based on the scaling value of the neighboring point and the photographed data of the reference point.