3D Image Display With Variable Focus and Luminance Compensation
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Solution Overview
Problem
Existing three-dimensional display devices using line progressive scanning in liquid crystal or organic electroluminescence displays result in inconsistent luminance recognition by observers, leading to distorted three-dimensional images due to varying pixel luminance across the frame period.
Innovation Solution
A three-dimensional-image display device that includes a liquid crystal or self-luminous display panel, a variable focus lens unit, and a controller, which controls the display of two-dimensional images on different focal planes with synchronized luminance adjustment to ensure consistent luminance across frame periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If line progressive scanning is used to display images sequentially, then the display operation can be continuously performed over a single frame period, but the luminance recognized by the observer becomes inconsistent across different pixel positions
Solution Approach 1:
The patent applies preliminary action by pre-calculating and adjusting the luminance of pixels at different positions before display. The controller identifies pixels that will be displayed later in the scanning sequence and pre-compensates their luminance values to account for the shorter display time, ensuring that all pixels contribute equally to the perceived image brightness.
Solution Approach 2:
The patent implements local quality by applying position-dependent luminance adjustment. Different pixels receive different luminance compensation based on their specific location in the scanning sequence. Pixels at the end of the scanning sequence receive greater luminance enhancement than those at the beginning, creating a non-uniform local adjustment that results in uniform overall perception.
2Device complexity
If pixels at different positions in the line progressive direction have the same display luminance, then the display device operates simply, but the observer perceives different luminance values due to varying display times
Solution Approach 1:
The patent changes the luminance parameter dynamically based on pixel position. The controller modifies the luminance value of each pixel according to its position in the scanning sequence, with later-positioned pixels receiving higher luminance values. This parameter change compensates for the varying display durations and ensures accurate luminance perception.
Solution Approach 2:
The patent incorporates feedback by considering the observed luminance effect when determining the display luminance. The system anticipates how varying display times affect perceived luminance and adjusts the display parameters accordingly, creating a feedback loop that ensures accurate visual perception despite the simple line progressive scanning mechanism.
3Ease of operation
If the luminance of pixels is not adjusted for position, then the display device is easier to control, but the three-dimensional image shape becomes distorted
Solution Approach 1:
The patent applies preliminary action by pre-adjusting pixel luminance values before the scanning display begins. The controller calculates the required luminance compensation for each pixel based on its position and applies this adjustment in advance, ensuring that the three-dimensional image maintains its correct shape without requiring complex real-time control modifications.
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 device ensures consistent luminance recognition of two-dimensional images on different focal planes, allowing observers to perceive a correct three-dimensional image without distortion.
Implementation Method 1
a liquid crystal display panel to sequentially display a first image and a second image, and emit display light of the first image and display light of the second image
Implementation Method 2
a variable focus lens unit to switch between a focal length for the display light of the first image and a focal length for the display light of the second image
Data Source
AI summary
A three-dimensional-image display device includes a liquid crystal display panel, a variable focus lens unit, and a controller. The liquid crystal display panel displays a first image and a second image that are sequentially displayed by line progressive scanning, and emits display light of the first image and display light of the second image. The variable focus lens unit switches the focal lengths for the display lights to form, as virtual images, the first image and the second image respectively on a first display surface and a second display surface. The controller configures display periods, during which either the first image or the second image is displayed in each display period, each with a plurality of frame periods, and controls luminance of pixels of the liquid crystal display panel to minimum luminance of the pixels in a last frame period.