Directional Backlight Grating Segmentation for 3D Display Uniformity
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Solution Overview
Problem
Current directional backlight units for 3D image display devices suffer from low brightness and non-uniform light emission due to the limited control over light emission directions and wavelengths, leading to suboptimal 3D image quality.
Innovation Solution
A directional backlight unit is designed with a light guide plate, multiple gratings, and a color filter, where the gratings are arranged to emit color lights in specific directions and wavelengths, improving light uniformity and brightness by adjusting grating pitches and orientations to match incident angles and wavelengths, and the color filter selectively transmits light to match the emitted beams with the required views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a grating is used to control light emission direction in a directional backlight unit, then light direction control is improved, but light uniformity deteriorates because a relatively large amount of light is emitted at a front portion and the amount of emitted light decreases toward a rear portion
Solution Approach 1:
The light guide plate is divided into multiple sections along the light emission direction, with each section having a different grating pitch. The first section has a first grating pitch, the second section has a second grating pitch different from the first, and subsequent sections follow this pattern. This segmentation allows different portions of the light guide plate to emit light at different intensities, compensating for the natural decrease in light intensity toward the rear portion and achieving improved light uniformity across the display panel.
2Stability of the object's composition
If the grating pitch is increased to emit light toward the rear portion, then light uniformity is improved, but the emission angle and direction control precision deteriorates
Solution Approach 1:
Different sections of the light guide plate are assigned different grating pitches according to their specific needs. The first section uses a first grating pitch optimized for front portion emission with precise angle control, while the second section uses a second grating pitch optimized for rear portion emission to compensate for light intensity decay. This local optimization allows each section to maintain appropriate emission angle precision while collectively achieving overall light uniformity across the display panel.
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 enhances the brightness and uniformity of the backlight unit, enabling high-quality 3D image display by optimizing light emission directions and wavelengths, thereby improving the overall image quality and reducing light loss.
Implementation Method 1
a grating configured to react to a plurality of color lights incident on the light guide plate
Implementation Method 2
a color filter comprising a plurality of color filter pixels that respectively correspond to the plurality of color lights emitted from the plurality of gratings
Data Source
AI summary
A directional backlight unit and a three-dimensional (3D) image display device including the directional backlight unit are provided. The directional backlight unit includes: a light guide plate, a light source configured to irradiate an incident surface of the light guide plate with a plurality of color lights, and a grating that includes a sub-grating configured to react to all of the plurality of color lights. The directional backlight unit may further include a color filter that corresponds to a plurality of color lights emitted from each sub-grating.