Backlight Unit Light Guide Plate 2D 3D Display Brightness
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Solution Overview
Problem
Existing 3D display devices with integrated 2D displays suffer from decreased brightness and display quality due to the dual Light Guide Plate (LGP) configuration, and manufacturing errors can lead to non-uniform gaps between the image panel and the barrier pattern, affecting light direction and pixel positioning.
Innovation Solution
The implementation of a display device with a light guide plate featuring a first output pattern for directional light and a second output pattern for uniform nondirectional light, allowing for independent control of light direction for 3D and 2D images, respectively, and maintaining uniform light distribution across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual Light Guide Plate (LGP) configuration is used to implement both 2D and 3D displays, then the device can provide both display modes in one device, but the brightness and display quality decrease
Solution Approach 1:
The patent divides the light guide function into two separate light guide plates: a first light guide plate for 2D display and a second light guide plate for 3D display. Each plate is optimized for its specific function, with the first plate providing uniform light distribution for 2D and the second plate providing directional light for 3D, thereby avoiding the brightness degradation that occurs when a single plate must serve both purposes
Solution Approach 2:
Each light guide plate is designed with specific optical properties tailored to its function. The first light guide plate has optical characteristics optimized for uniform 2D illumination, while the second light guide plate has characteristics optimized for directional 3D light output. This localized optimization ensures high brightness and quality for each display mode without compromise
2Adaptability or versatility
If a barrier pattern is disposed in straight line form on the lower portion of the LGP for 3D mode, then the 3D display can be implemented, but manufacturing errors cause non-uniform gaps between the image panel and barrier pattern
Solution Approach 1:
The patent extracts the barrier pattern from the light guide plate structure and positions it on the image panel instead. This separation allows the barrier pattern to be independently positioned and aligned with the pixels on the image panel, eliminating the gap uniformity issues that arise when the barrier is attached to the light guide plate and subject to manufacturing and assembly variations
Solution Approach 2:
The image panel serves as an intermediary structure that holds both the pixels and the barrier pattern in precise alignment. By using the image panel as the reference structure for positioning the barrier pattern, the system achieves consistent gap uniformity across the entire display area, overcoming the limitations of direct LGP-to-barrier alignment
3Adaptability or versatility
If the LGP contracts or expands based on use temperature or heat generation, then the display can operate in various conditions, but the gap between image panel and barrier pattern becomes non-uniform
Solution Approach 1:
By separating the barrier pattern from the light guide plate and attaching it to the image panel instead, the system removes the barrier from the thermal expansion/contraction cycle of the LGP. The image panel serves as a stable reference structure that does not undergo the same thermal dimensional changes, thereby maintaining consistent gap uniformity across temperature variations
Solution Approach 2:
The design anticipates thermal expansion and contraction of the light guide plate by decoupling the barrier pattern positioning from the LGP. This beforehand cushioning approach ensures that thermal dimensional changes in the LGP do not affect the critical gap between the barrier pattern and pixels, maintaining display quality across the operating temperature range
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
This solution enhances the quality of both 2D and 3D images by ensuring sufficient and uniform light distribution, while minimizing the impact of manufacturing errors and maintaining high brightness levels.
Implementation Method 1
light from the LED light source passes through an LGP layer
Implementation Method 2
The lenticular lens may allow each pixel image to be displayed in a predetermined direction
Implementation Method 3
The parallax barrier may allow a predetermined pixel to be shown from a predetermined direction through a slit
Data Source
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AI summary
A backlight unit, a display device including the backlight unit, and a method of manufacturing the backlight unit are provided. The backlight unit may include a light guide plate configured to provide light for a two-dimensional (2D) image and light for a three-dimensional (3D) image to a display panel, and the light guide plate may include a first output pattern formed on an upper surface of the light guide plate and configured to output the first light provided from the first light source to a display panel and a second output pattern formed on a lower surface of the light guide plate and configured to output the second light provided from the second light source to the display panel.