Backlight Assembly Light Guide Plate Lower Prisms
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Solution Overview
Problem
Conventional backlight assemblies for LCDs require multiple optical sheets, increasing manufacturing costs and product thickness while often resulting in non-uniform luminance, which affects display quality.
Innovation Solution
A backlight assembly design featuring a light guide plate with a unique configuration of lower prisms and flat portions, where each lower prism has distinct oblique planes and a negative slope, optimizing light distribution and reducing the need for multiple optical sheets by enhancing luminance uniformity and light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical sheets are used to enhance luminance and uniformity, then display quality is improved, but manufacturing cost increases and product thickness increases
Solution Approach 1:
The patent combines multiple optical functions into a single light guide plate by integrating lower prisms with asymmetric slopes directly into the LGP structure. This merging of functions eliminates the need for separate optical sheets while maintaining luminance uniformity enhancement
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: light guidance, luminance enhancement, and uniformity improvement through the integrated lower prism structure with specific slope configurations, making it a multi-functional component
2Illumination intensity
If multiple optical sheets are used to enhance luminance and uniformity, then display quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple optical functions into a single light guide plate by integrating lower prisms with asymmetric slopes directly into the LGP structure. This merging of functions eliminates the need for separate optical sheets while maintaining luminance uniformity enhancement
Solution Approach 2:
The patent extracts and eliminates unnecessary optical sheets from the conventional backlight assembly, retaining only the essential light guide plate with integrated optical features, thereby simplifying the structure and reducing manufacturing costs
3Ease of manufacture
If conventional light guide plate structure is used, then manufacturing is simple, but dark areas appear in viewing angle and luminance uniformity is poor
Solution Approach 1:
The patent applies local quality by creating asymmetric slope configurations specifically in the lower prism regions of the light guide plate. The first surface has a positive slope while the second surface has a negative slope, optimizing light distribution in specific areas to eliminate dark spots and improve overall luminance uniformity
Solution Approach 2:
The patent employs asymmetry by designing the lower prisms with non-uniform slope configurations where the first surface has a positive slope and the second surface has a negative slope. This asymmetric design optimizes light extraction and distribution to prevent dark areas in the viewing angle
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 design reduces manufacturing costs and enhances display quality by improving luminance uniformity and light output, minimizing the use of optical sheets and preventing dark areas in the viewing angle, thereby improving the exterior quality of the LCD.
Implementation Method 1
each lower prism includes a first surface and a second surface adjoining the first surface, wherein the first surface includes a plurality of oblique planes each having a different positive slope, wherein the second surface has a negative slope
Implementation Method 2
the bottom surface includes a plurality of lower prisms separated from one another by a flat portion interposed between each pair of lower prisms
Data Source
AI summary
A backlight assembly which can reduce manufacturing costs and enhance display quality of a liquid crystal display (“LCD”). The backlight assembly includes: a light source emitting light; and a light guide plate (“LGP”) including an incident surface on which light emitted from the light source is incident, a top surface which adjoins the incident surface, and a bottom surface which adjoins the incident surface, faces the top surface, and includes a plurality of lower prisms separated from one another and flat portions interposed between the lower prisms, wherein each of the lower prisms includes a first surface and a second surface which are adjacent to each other, the first surface including a plurality of oblique planes having different positive slopes, the second surface having a negative slope, and where the slope forms an angle with a line normal to the incident surface.