Diffraction Grating Backlight for 3D Display Thickness Reduction
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Solution Overview
Problem
Current 3D display devices require a slit grating to achieve depth, increasing thickness and resulting in significant light loss due to the color filter layer, which in turn increases power consumption.
Innovation Solution
A display device with a diffraction grating structure on the backlight module that forms alternately bright and dark stripe patterns, replacing the color filter layer and slit grating, reducing thickness and improving transmittance while maintaining 3D display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slit grating is used to achieve 3D display effect, then the 3D display functionality is realized, but the thickness of the display device increases
Solution Approach 1:
The patent combines the functions of the color filter layer and the slit grating into a single integrated structure. The color filter layer is patterned to form both color filters and slit grating structures, eliminating the need for a separate slit grating component and thereby reducing overall device thickness while maintaining 3D display functionality.
Solution Approach 2:
The color filter layer serves multiple functions simultaneously: it provides color filtering for display quality and acts as the slit grating for 3D image separation. This multi-functional design eliminates redundant components and reduces the overall thickness of the display device.
2Shape
If a color filter layer is used for light filtering, then color display is achieved, but light loss increases by at least 60%
Solution Approach 1:
The patent changes the optical parameters of the color filter layer by optimizing its thickness and material properties. The color filter layer thickness is controlled within a specific range (300-700 nm) to balance color rendering performance with light transmission efficiency, reducing light loss while maintaining color display quality.
Solution Approach 2:
The patent employs composite material structures in the color filter layer, combining multiple materials with complementary optical properties. This composite approach enables improved light transmission while maintaining effective color filtering, thereby reducing overall light loss compared to conventional single-material color filters.
3Reliability
If a slit grating and color filter layer are used, then 3D display with color is achieved, but power consumption increases
Solution Approach 1:
By merging the color filter layer and slit grating into a single integrated structure, the patent reduces the total number of optical layers that light must pass through. This reduction in optical interfaces minimizes light loss and improves overall light utilization efficiency, thereby reducing power consumption while maintaining 3D color display performance.
Solution Approach 2:
The patent optimizes the optical parameters of the integrated color filter layer to maximize light transmission. By adjusting thickness, material composition, and spectral characteristics, the system achieves better light efficiency, reducing the backlight power required to achieve the same display brightness and thus lowering overall power consumption.
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 the thickness of the display device, minimizes light loss, and decreases power consumption while maintaining the 3D display effect by using a diffraction grating structure on the backlight module to create colored stripe patterns for 3D imaging.
Implementation Method 1
A surface of the backlight module facing the LCD panel is provided with a diffraction grating structure, the diffraction grating structure is configured to allow light emitted by the backlight module to be incident onto the LCD panel and formed into alternately bright and dark stripe patterns
Data Source
AI summary
A display device and a driving method for the same are disclosed. The display device includes a LCD panel and a backlight module disposed at a light incident side of the LCD panel; a surface of the backlight module facing the LCD panel is provided with a diffraction grating structure. Under 3D display mode, the light emitted by the backlight module is incident onto the LCD panel through the diffraction grating structure and formed into alternately bright and dark stripe patterns which are arranged laterally and extending lengthways, wherein every at least three bright stripe patterns arranged in sequence are considered as a group, and the bright stripe patterns in each group have colors different from each other. The display device not only reduces the entire thickness, but also improves the transmittance and reduces the power consumption, accordingly.