Direct Type Backlight Unit Dot Pattern Light Distribution
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Solution Overview
Problem
The direct type backlight unit faces issues with shape display of lamps on the LCD panel due to non-uniform light distribution, leading to luminance imbalance and increased material costs from separate pressing processes for forming prism patterns on the reflecting plate.
Innovation Solution
A direct type backlight unit with dot patterns formed on the diffuser or diffusion sheet using a printing method to disperse light at the center of lamps and condense light between them, reducing the need for separate prism patterns and minimizing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If prism patterns are formed on the reflecting plate using a separate pressing material, then luminance deviation is minimized, but material cost increases and device weight increases
Solution Approach 1:
The patent merges the function of the reflecting plate and the prism pattern into a single integrated component. The reflecting plate itself is formed with prism patterns directly on its surface, eliminating the need for a separate pressing material. This integration maintains the light-reflecting and light-condensing functions while reducing material cost and device weight.
Solution Approach 2:
The reflecting plate is designed to perform multiple functions simultaneously: it reflects light from the lamps and also condenses light through its integrated prism patterns. This multi-functionality eliminates the need for additional components, thereby reducing material cost and simplifying the overall structure.
2Illumination intensity
If prism patterns are formed on the reflecting plate using a separate pressing material, then luminance deviation is minimized, but device weight increases
Solution Approach 1:
The patent combines the reflecting plate and the prism pattern into a single component, eliminating the need for a separate pressing material. This merger reduces the total weight of the backlight unit while maintaining the light-condensing function necessary for luminance uniformity.
Solution Approach 2:
The integrating plate serves dual purposes as both a light reflector and a light condenser through its integrated prism patterns. This multi-functionality eliminates additional components, thereby reducing the overall weight of the device.
3Use of energy by moving object
If lamps are arranged below the display area, then light efficiency is improved and configuration is simplified, but shape display of lamps occurs on the LCD panel
Solution Approach 1:
The patent applies local quality by creating dot patterns at specific locations on the integrating plate corresponding to the lamp positions. These localized dot patterns modify the light distribution in the regions where lamps are arranged below the display area, preventing the lamp shapes from being displayed on the panel while maintaining overall light efficiency.
4Manufacturing precision
If reflecting plate is processed using a separate pressing material, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the reflecting plate and the prism pattern into a single integrated component. This integration reduces the number of components and assembly steps, thereby simplifying the device structure and reducing manufacturing complexity while maintaining the precision of the prism patterns.
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 effectively prevents shape display of lamps on the LCD panel, improving display quality and reducing material costs while enhancing stability in mass production by uniformly distributing light and eliminating the need for separate prism patterns.
Implementation Method 1
dot patterns formed on at least one of the diffuser and the diffusion sheet to face the plurality of lamps, wherein the dot patterns disperse light at the center of the lamps and condense the light in a boundary between the lamps
Data Source
AI summary
A direct type backlight unit is disclosed. The direct type backlight unit includes a plurality of lamps arranged in a plane with respect to a display area, a diffusion sheet and a diffuser sequentially arranged above the plurality of lamps, and dot patterns formed on at least one of the diffuser and the diffusion sheet to face the plurality of lamps, wherein the dot patterns disperse light at a center of the plurality of lamps and condense the light in a boundary between the plurality of lamps. Thus, an effect for removing a shape display of the lamps on an LCD panel can be obtained to improve display quality. Also, since the dot patterns are formed by a printing method, no separate prism pattern is required. As a result, the material cost can be reduced and stability in mass production can be obtained.