Backlight Component with Embedded Light Source and Parallel Beam Coupling
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Solution Overview
Problem
Traditional edge-lit backlight components face challenges in reducing thickness while maintaining luminance, as thin light guide plates make it difficult to attach light emitting devices and necessary optical structures, increasing thickness and hindering the development of thin and light liquid crystal display devices.
Innovation Solution
A backlight component comprising a light guide plate with a light emitting device on its edge and an optical element on the opposite side, which converts the light into a parallel beam through total reflection, utilizing holographic microstructures and coupling gratings to enhance light distribution and intensity, along with a filling and absorbing layer to optimize light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the light guide plate is made thinner to reduce overall thickness, then the backlight component achieves thinness, but it becomes difficult to attach light emitting devices and optical structures
Solution Approach 1:
The light emitting device is embedded within grooves formed on the light guide plate, creating a nested structure where the device is housed within the plate itself. This integration allows the light guide plate to maintain its thin profile while providing secure attachment points for the light emitting devices through the groove structures.
Solution Approach 2:
The invention transitions from surface-level attachment to three-dimensional groove-based embedding. By creating grooves that extend into the thickness of the light guide plate, the attachment mechanism utilizes the third dimension (depth) to secure light emitting devices, enabling reliable mounting even in thin plates where surface attachment would be insufficient.
2Illumination intensity
If traditional optical structures are used to maintain luminance, then light distribution is achieved, but the component thickness increases
Solution Approach 1:
The invention extracts and eliminates unnecessary intermediate optical structures from the light path. By directly coupling light emitting devices into grooves on the light guide plate and using the plate's own optical properties, the design removes redundant components that would otherwise increase thickness, achieving luminance maintenance with a thinner profile.
Solution Approach 2:
The light guide plate combines multiple functions into a single integrated component: it serves as the light guiding medium, contains embedded grooves for light emitting device attachment, and provides the optical path for light distribution. This merging of functions eliminates the need for separate mounting structures and intermediate optical elements, reducing overall thickness while maintaining luminance.
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 configuration allows for a thinner backlight component that maintains or improves luminance by efficiently coupling light into the guide plate, reducing thickness and enabling the production of ultra-thin display products while ensuring even light intensity distribution.
Implementation Method 1
an optical element on a light emitting side of the light emitting device in a thickness direction, wherein the optical element is configured to convert the light emitted from the light emitting device into a parallel beam propagating in the light guide plate by total reflection
Implementation Method 2
each of the coupling gratings is configured to: convert the parallel beam to be an emitting beam at a light intensity ratio corresponding to the position where the coupling grating is located, the emitting beam being a collimated beam propagating in a direction away from the light guide plate
Data Source
AI summary
The present disclosure relates to a backlight source, a method of manufacturing the backlight source, and a display device. The backlight source comprising: a light guide plate; a light emitting device on a side of the light guide plate in a thickness direction, wherein the light emitting device is configured to emit light irradiated into the light guide plate; and an optical element on a light emitting side of the light emitting device in a thickness direction, wherein the optical element is configured to convert the light emitted from the light emitting device into a parallel beam propagating in the light guide plate by total reflection. The light emitting device and the optical element may convert the light emitted from the light emitting device to be a parallel beam in the thickness direction of the light guide plate, so that the light may be coupled into the light guide plate according to needs when the light guide plate is rather thin, which facilitates to reduce the thickness of the backlight source and related products.