Semi-transparent mirror stereo display luminance correction
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Solution Overview
Problem
Conventional stereo image display devices with semi-transparent mirrors suffer from luminance and chromaticity imbalances due to reflection and transmittance characteristics, causing uncomfortable binocular vision and requiring inconvenient dark room calibration, and lack flexibility in calibration environments.
Innovation Solution
A stereo image display device with obliquely positioned semi-transparent mirrors, luminance and chromaticity correction mechanisms, and calibration sensors that adjust luminance and chromaticity input signals based on measured reflectance and transmittance ratios to cancel differences and allow for flexible calibration without ambient light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a semi-transparent mirror is used to display stereo images, then binocular vision is enabled, but luminance and chromaticity imbalances occur between left-eye and right-eye images
Solution Approach 1:
The patent applies local quality by adjusting luminance and chromaticity parameters specifically for the reflected image path while leaving the transmitted image path unchanged. Different correction coefficients are applied to different parts of the optical system (reflected vs transmitted paths) to achieve overall balance.
Solution Approach 2:
The patent changes physical parameters (luminance and chromaticity values) of the displayed images to compensate for the semi-transparent mirror's optical characteristics. By adjusting these parameters through correction coefficients, the patent achieves balanced perception despite the mirror's inherent asymmetry.
2Measurement precision
If calibration is performed with a separate optical sensor, then calibration accuracy is improved, but the device requires dark room environment and becomes inconvenient to operate
Solution Approach 1:
The patent extracts the calibration function from a separate optical sensor and integrates it into the display device itself. The display device's own sensors are used for calibration, eliminating the need for external equipment and dark room conditions.
Solution Approach 2:
The display device performs calibration using its own built-in sensors and processing capabilities, making the system self-sufficient. The device calibrates itself without requiring external assistance or controlled environmental conditions.
3Adaptability or versatility
If a calibration optical sensor is provided separate from the image display device, then calibration can be executed, but the distance between sensor and display portion is long requiring highly sensitive sensors
Solution Approach 1:
The patent merges the calibration sensor with the image display device, placing them in close proximity. This integration eliminates the need for long-distance sensing and reduces the sensitivity requirements of the sensor.
4Illumination intensity
If luminance adjustment is applied to both display portions, then overall luminance control is achieved, but luminance difference due to semi-transparent mirror characteristics remains
Solution Approach 1:
The patent applies local quality by implementing differential luminance adjustment - applying different correction coefficients to the reflected and transmitted image paths. This localized adjustment compensates for the semi-transparent mirror's asymmetric optical characteristics.
Solution Approach 2:
The patent uses feedback from sensors that measure the actual luminance and chromaticity of displayed images. This feedback information is used to dynamically adjust correction coefficients, ensuring continuous compensation for the semi-transparent mirror's effects.
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 effectively suppresses luminance and chromaticity differences, improving the comfort of binocular vision and enabling flexible, ambient-light-independent calibration of the device.
Implementation Method 1
The semi-transparent mirror is configured to reflect the image, which is displayed on the first image display means, toward an observer, and is configured to allow the image, which is displayed on the second image display means, to transmit therethrough toward the observer
Data Source
AI summary
A luminance correction computation unit 23 corrects a luminance input signal LI, which is inputted into a first luminance adjustment portion 13, to LO based on the semi-transparent mirror luminance correction coefficient b, and the luminance correction computation unit 23 corrects a luminance input signal LI, which is inputted into a second luminance adjustment portion 13, to LO based on the semi-transparent mirror luminance correction coefficient b. As a result, an image of the first image display portion 3, which is reflected by a semi-transparent mirror, and an image of the second image display portion, which is allowed to transmit through the semi-transparent mirror, are corrected in order to cancel a luminance difference according to an optical characteristic of the semi-transparent mirror.