Flat Screen Panel Aging Compensation via Integrated Sensor
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Solution Overview
Problem
Aging effects of light transmitting components in flat screens, such as panel glass, LCD fluid, and polarization foils, interfere with the optimal image reproduction characteristic, making it difficult to maintain the desired image quality over time.
Innovation Solution
A sensor is integrated into the flat screen to measure luminance during a calibration phase, allowing the graphics processor to adjust the lookup table and correct for these aging effects, with the sensor being pivoted and sealed to ensure accurate measurements without visible interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a sensor is integrated into the flat screen to measure luminance during calibration phase, then the image reproduction characteristic can be automatically adjusted, but the device complexity increases
Solution Approach 1:
The sensor is integrated into the frame structure of the flat screen, merging the measurement function with the existing display structure. This reduces the need for separate external measurement devices and minimizes overall system complexity while enabling automatic calibration.
Solution Approach 2:
The flat screen performs self-calibration by using its own sensor to measure luminance and automatically adjusting the lookup table through the graphics processor. This self-service capability eliminates the need for external calibration equipment and manual intervention, achieving automation without proportionally increasing complexity.
2Measurement precision
If the sensor is positioned to measure luminance accurately, then measurement precision improves, but the sensor becomes visible to viewers during normal operation
Solution Approach 1:
The sensor is made movable between a measurement position and a retracted position. During calibration, the sensor moves to the measurement position for accurate luminance measurement. During normal operation, it moves to the retracted position where it is no longer visible to viewers, thus eliminating visual interference while maintaining measurement capability.
Solution Approach 2:
The sensor is positioned in a recess of the frame structure, utilizing the depth dimension rather than protruding into the viewing area. This allows the sensor to be close enough to the display surface for accurate measurement while being hidden from the viewer's perspective during normal operation.
3Device complexity
If the sensor is exposed to ambient light, then the device structure is simplified, but measurement precision deteriorates
Solution Approach 1:
A sealing device is introduced as an intermediary between the sensor and the ambient environment. This sealing structure selectively blocks ambient light from reaching the sensor during measurement while allowing the sensor to remain in its optimal measurement position, thus protecting measurement precision without requiring complex active shielding mechanisms.
4Measurement precision
If manual calibration is performed by service personnel, then measurement precision can be ensured, but loss of time increases
Solution Approach 1:
The system performs automatic self-calibration using an integrated sensor and graphics processor that adjusts the lookup table based on measured luminance values. This eliminates the need for service personnel intervention, reducing calibration time from hours or days to minutes or seconds, while maintaining measurement precision through automated feedback control.
Solution Approach 2:
The calibration system uses feedback from the sensor's luminance measurements to automatically adjust the lookup table in the graphics processor. This closed-loop feedback mechanism ensures measurement precision is maintained while enabling rapid automated calibration without manual intervention, significantly reducing time loss compared to manual methods.
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
The solution automatically adjusts the image reproduction characteristic, reducing the impact of aging effects and eliminating the need for manual intervention, while ensuring accurate and ambient-light-shielded measurements for improved image quality.
Implementation Method 1
a luminance of a test image is measured by a sensor
Data Source
AI summary
An arrangement with a panel of a flat screen and a graphics processor, to which a digitized image signal can be applied. A lookup table evaluates the digitized image signal and transmits the digitized image signal to the panel via an interface, whereby the image information is visually displayed. Suitable means are used to reduce interfering influences on the image reproduction characteristic of the panel due to aging effects of the light transmitting parts of the panel, e.g., due to aging effects of the panel glass, the LCD fluid or the diffuser and/or polarization foils. The sensor is only visible above the display surface during a calibration phase. The image reproduction characteristic is adjusted automatically on site, e.g., while the flat screen is in use. No service personnel are required for this purpose.