Stereoscopic Display Brightness Compensation via Periodic Light Source
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Solution Overview
Problem
Stereoscopic image display devices using a parallax barrier suffer from reduced light intensity when displaying 3D images, resulting in decreased brightness compared to 2D images.
Innovation Solution
A stereoscopic display device with a barrier and a light source that adjusts brightness by controlling the molecular arrangement of liquid crystal shutters and emitting different light intensities in 2D and 3D modes, using a secondary light source or varying current to the light emitting diodes to maintain sufficient brightness in 3D mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a parallax barrier is used to display 3D images, then stereoscopic effect is achieved, but light intensity is reduced to half compared to 2D images
Solution Approach 1:
The patent employs time-divisional multiplexing where the light source alternates between high brightness (for 3D images) and normal brightness (for 2D images) at different time periods. The barrier shutter synchronizes with this periodic action to control light transmission, allowing the display to achieve both stereoscopic effect and adequate brightness by displaying 3D and 2D images in alternating time slots
Solution Approach 2:
The patent changes the brightness parameter of the light source dynamically based on the display mode. When switching from 2D to 3D image display, the light source brightness is increased to compensate for the light blocking effect of the barrier, thereby maintaining sufficient perceived brightness for 3D images while achieving the stereoscopic effect
2Illumination intensity
If light source brightness is increased to compensate for barrier light loss, then 3D image brightness is improved, but power consumption increases
Solution Approach 1:
The light source operates in periodic cycles, alternating between high brightness mode (when displaying 3D images) and normal brightness mode (when displaying 2D images). This time-divisional approach ensures that high power consumption occurs only during 3D display periods, reducing overall energy usage compared to continuously operating at high brightness
Solution Approach 2:
The light source brightness is dynamically adjusted based on the current display mode (2D or 3D) rather than maintaining a fixed high brightness level. The system adapts the light output in real-time according to the barrier's state and the type of image being displayed, optimizing energy efficiency while maintaining adequate brightness when needed
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 ensures that 3D images are displayed with enhanced brightness, matching or exceeding the brightness of 2D images, thereby improving the overall viewing experience without excessive power consumption.
Implementation Method 1
a light source for supplying light to the display unit
Implementation Method 2
The barrier is placed in front of the display panel 10 and includes liquid crystal cells corresponding to respective the right-eye and the left-eye pixels. The liquid crystal cell is varied to be transparent or opaque
Data Source
AI summary
The stereoscopic display device includes a display unit including a first pixel group for displaying a first image and a second pixel group for displaying the second image, a barrier having transparent regions and opaque regions such that the first image and the second image are observed through the transparent regions at different points and a light source for supplying light to the display unit. The light source has the different brightness between the first mode and the second mode.