Display Apparatus Calibration via Distance-Based Luminance Adjustment
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Solution Overview
Problem
Existing display apparatuses face calibration challenges due to distortion of calibration marks, leading to inaccurate position detection, especially when the installation state changes, requiring multiple attempts and increasing calibration time.
Innovation Solution
The display apparatus measures the distance between the display section and the screen, adjusts the luminance of the calibration image based on this measurement, and projects a calibration image with position detection marks, allowing for accurate calibration by associating screen and captured image coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple calibration images are prepared and multiple calibration attempts are performed, then the probability of successful calibration is improved, but the calibration time increases
Solution Approach 1:
The patent applies preliminary action by measuring the distance between the display apparatus and display surface before performing calibration. This preliminary distance measurement allows the system to determine appropriate display conditions for the calibration image in advance, ensuring that the calibration image is displayed with suitable luminance and clarity from the first attempt, thereby reducing the need for multiple calibration attempts and decreasing overall calibration time while maintaining high success rate
Solution Approach 2:
The patent applies parameter changes by adjusting the luminance of the calibration image based on the measured distance. When the distance is short, the luminance is reduced to prevent saturation; when the distance is long, the luminance is increased to ensure visibility. This dynamic parameter adjustment ensures optimal calibration image display conditions for various installation scenarios, improving calibration success rate on the first attempt and reducing the need for multiple attempts
2Ease of operation
If the calibration image luminance is increased to improve visibility, then the ease of operation is improved, but the measurement precision deteriorates due to saturation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the luminance parameter of the calibration image based on the measured distance between the display apparatus and display surface. This ensures that the calibration image is always displayed at an optimal luminance level that provides good visibility without causing saturation, thereby simultaneously improving ease of operation and maintaining measurement precision
Solution Approach 2:
The patent applies feedback by using the distance measurement result to control the luminance display conditions. The measured distance provides feedback information that is used to adjust the calibration image luminance appropriately, ensuring that the luminance is neither too high (causing saturation) nor too low (reducing visibility), thus maintaining both ease of operation and measurement precision
3Device complexity
If the calibration is performed without considering installation state, then the device complexity is reduced, but the reliability of calibration deteriorates
Solution Approach 1:
The patent applies self-service by enabling the display apparatus to automatically measure the distance to the display surface and autonomously determine the appropriate luminance conditions for displaying the calibration image. This self-service capability allows the system to adapt to different installation states automatically without requiring complex manual configuration or user intervention, thereby maintaining simple operation while improving calibration reliability across various installation scenarios
Solution Approach 2:
The patent applies dynamics by making the calibration process adaptive to different installation conditions through distance measurement. Rather than using a fixed calibration approach, the system dynamically adjusts the calibration image display conditions based on the actual distance to the display surface, enabling reliable calibration for both close and distant installations without significantly increasing device complexity
Data Source
AI summary
A display apparatus includes a display section that projects and displays an image on a display surface, an imaging section that captures an image of the display surface, a measurement section that measures the distance between the display surface and the display section, and a calibration processor that causes the display section to display a calibration image containing a position detection mark based on the distance measured by the measurement section, causes the imaging section to capture an image of the calibration image displayed on the display surface, and performs calibration that associates coordinates on the image with coordinates on the captured image captured by the imaging section based on the captured image.