Backlight Module with Dual Light Guides for Brighter 3D Displays
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Solution Overview
Problem
Existing naked-eye stereoscopic display technologies face challenges with high costs, reduced image brightness, and difficulty in improving resolution due to the use of costly lenses and slit-type gratings that block light, leading to increased power consumption.
Innovation Solution
A backlight module design incorporating a light guide plate assembly with two light guide plates and reverse prism sheet, along with alternating first and second light source modules, allows for directional light emission to separately enter the left and right eyes, enhancing image brightness and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lenses are used for naked-eye stereoscopic display, then stereoscopic vision is achieved, but cost increases and image resolution deteriorates
Solution Approach 1:
The light guide plate is divided into multiple independent light guide regions, each corresponding to a specific viewing angle. This segmentation allows different regions to direct light to different eyes without requiring lenses, achieving stereoscopic vision while maintaining image quality.
Solution Approach 2:
The patent introduces a light guide plate as an intermediary component between the light source and the viewer's eyes. This mediator directs light through its structural design rather than using lenses, eliminating the need for costly optical elements while preserving resolution.
2Adaptability or versatility
If slit-type gratings are used for naked-eye stereoscopic display, then stereoscopic vision is achieved, but light transmission is blocked causing brightness reduction
Solution Approach 1:
The invention extracts the light direction function from the grating structure and relocates it to the light guide plate. By removing the grating's light-blocking function and replacing it with a light-guiding mechanism, brightness is preserved while stereoscopic vision is maintained.
Solution Approach 2:
The patent replaces the mechanical light-blocking mechanism of slit-type gratings with an optical light-guiding mechanism. The light guide plate uses total internal reflection and refraction to direct light, substituting a more efficient optical system for the mechanical obstruction method.
3Illumination intensity
If backlight power is increased to compensate for brightness reduction, then image brightness is improved, but energy consumption increases
Solution Approach 1:
The light guide plate continuously directs light from the source to the viewer's eyes through its structured design, ensuring efficient light transmission without loss. This continuous light guidance eliminates the need for increased power to compensate for transmission losses.
Solution Approach 2:
The invention changes the optical parameters of the light guide plate (refractive index, structure geometry) to optimize light transmission efficiency. By adjusting these parameters, the system achieves high brightness with minimal energy input, avoiding the need to increase backlight power.
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 reduces energy consumption, improves image brightness and resolution, and enables stereoscopic vision by alternately activating light source modules to provide separate images to each eye, thus reducing costs and enhancing display quality.
Implementation Method 1
a first light guide plate and a second light guide plate... for guiding light
Implementation Method 2
a reverse prism sheet... includes a substrate and a plurality of prismatic structures
Implementation Method 3
the first and second light source modules are adapted to be activated alternatively at a frequency
Data Source
AI summary
The present invention provides a backlight module, including a light guide plate assembly, a reverse prism sheet, and a first and a second light source modules. The light guide plate assembly includes a first and an upper second light guides. The light guide plates respectively have a light incident and a light exiting surfaces, and a bottom surface with a plurality of light guide structures formed thereon. The light exiting and bottom surfaces are located on opposite sides of the light guide plate, and respectively connected to the light incident surface. The two light incident surfaces are respectively located on opposite sides of the light guide plate assembly. The reverse prism sheet is disposed on the second light guide plate with prismatic structures facing the same. The light source modules are respectively disposed aside the two incident surfaces, and are adapted to be activated alternatively at a frequency.