Edge-Type Backlight Local Dimming via Layered Substrate
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Solution Overview
Problem
There is a demand for a slim display apparatus using an edge type backlight apparatus that also provides local dimming, as direct type backlight apparatuses are thicker due to uniformly arranged light emitting elements on the rear surface of the LCD panel, whereas edge type backlight apparatuses lack efficient local dimming capabilities.
Innovation Solution
The proposed solution involves a backlight apparatus with a substrate having multiple layers, where light emitting modules are arranged on the top layer, and wires penetrate through these layers to connect the modules to a driving unit, allowing for independent control of light emitting blocks along the edge of the display panel, enabling local dimming while maintaining a slim profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are uniformly arranged on the rear surface of the LCD panel (direct type backlight), then the backlight can provide uniform illumination, but the thickness of the display apparatus increases
Solution Approach 1:
The backlight unit is divided into multiple light emitting blocks (first, second, third, and fourth light emitting blocks) that can be independently controlled. Each block contains light emitting modules arranged along edges, allowing selective activation of specific regions for local dimming while maintaining overall thinness through the edge-type configuration.
Solution Approach 2:
The patent transitions from a two-dimensional array of light emitting elements on the rear surface to a one-dimensional arrangement along the edges of the panel. This dimensional change allows the light emitting modules to be positioned at the periphery, reducing the thickness required in the central area while still providing effective illumination.
2Length of stationary object
If light emitting elements are arranged along only the edge of the LCD (edge type backlight), then the thickness is reduced, but the capability for local dimming is insufficient
Solution Approach 1:
The edge-type backlight is segmented into multiple independently controllable light emitting blocks positioned at different edges and regions of the panel. This segmentation enables selective activation of specific blocks to achieve local dimming effects, adding functional versatility to the thin edge-type structure.
Solution Approach 2:
Different regions of the backlight unit are assigned different functions through independent control of light emitting blocks. Certain blocks can be activated or deactivated based on local brightness requirements, enabling local dimming capabilities while maintaining the overall thin profile of the edge-type configuration.
3Adaptability or versatility
If multiple light emitting blocks are independently controlled for local dimming, then local dimming capability is improved, but the device complexity increases
Solution Approach 1:
Multiple light emitting modules within each light emitting block are electrically connected in parallel to the same driving signal line. This merging approach allows independent control of each block while simplifying the wiring structure, as modules within a block share common electrical connections rather than requiring individual wiring for each module.
Solution Approach 2:
The substrate structure serves multiple functions simultaneously: it provides mechanical support for the light emitting modules, acts as an electrical connection medium through its conductive layers, and enables signal distribution to multiple blocks. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity.
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 reduced width of the backlight apparatus, enabling a slim display apparatus that supports local dimming by independently controlling light emitting blocks, thus addressing the thickness and dimming capability issues of existing edge type backlight systems.
Implementation Method 1
a plurality of light emitting modules, a driving unit which drives the plurality of light emitting modules
Implementation Method 2
a plurality of wires penetrate through the plurality of layers to electrically connect the plurality of light emitting modules and the driving unit
Data Source
AI summary
A backlight apparatus includes a substrate which includes a plurality of layers. A plurality of light emitting modules are arranged on a top layer of the plurality of layers closest to a light guide panel, and a plurality of wires penetrates through the plurality of layers to electrically connect the light emitting modules and a plurality of driving units. Accordingly, the width of the substrate of an edge type backlight apparatus which can provide local dimming is reduced. Therefore, the display apparatus using the edge type backlight apparatus can be slim even if it is designed to provide local dimming.