Dimming Liquid Crystal Panel Local Dimming Backlight Module
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving local dimming while balancing the thickness and cost of the backlight module, as the number of LEDs required for effective local dimming increases the cost and limits the thinness of the module.
Innovation Solution
A light source module incorporating an optical plate, a light source, and a dimming liquid crystal panel with independent electrodes and signal pads allows for local dimming by controlling light transmittance in partition areas, reducing the need for multiple LEDs and enhancing display contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of LEDs is increased to achieve effective local dimming, then the local dimming performance is improved, but the cost of the backlight module increases
Solution Approach 1:
The patent replaces the mechanical/optical system of multiple LEDs with an electrical control system. A single edge-lit LED array combined with a liquid crystal dimming panel controlled by independent electrodes and signal pads creates local dimming zones without requiring multiple separate light sources, thereby reducing manufacturing cost while maintaining dimming performance
Solution Approach 2:
The patent introduces a liquid crystal dimming panel as an intermediary between the light source and the display. This panel, controlled by independent electrodes and signal pads, modulates light from a single LED array to create local dimming effects, eliminating the need for multiple LEDs while achieving the same visual result
2Reliability
If the number of LEDs is increased to achieve effective local dimming, then the local dimming performance is improved, but the thickness of the backlight module increases
Solution Approach 1:
The patent merges the lighting function and the dimming control function into a single integrated system. The edge-lit LED array and liquid crystal dimming panel work together as one unit, where the liquid crystal panel provides both the structural framework and the dimming control mechanism, eliminating the need for separate LED modules and reducing overall thickness
Solution Approach 2:
The patent uses a thin liquid crystal panel as the dimming control layer. Liquid crystal technology allows for extremely thin active layers that can be integrated into the backlight module without significantly increasing thickness, while still providing effective light modulation for local dimming
3Reliability
If a direct-type backlight module is used for local dimming, then the local dimming function is achieved, but the thickness of the backlight module increases
Solution Approach 1:
The patent inverts the traditional backlight architecture from direct-type to edge-lit type. Instead of placing LEDs directly behind the display panel (increasing thickness), the LEDs are positioned at the edges, and light is guided through the panel using optical plates and liquid crystal modulation, achieving local dimming with reduced thickness
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 reduces the number of LEDs required, lowers manufacturing costs, and improves display contrast by enabling local dimming without increasing the thickness of the backlight module, while maintaining effective light control through the dimming liquid crystal panel.
Implementation Method 1
a liquid crystal material layer disposed between the first driving substrate and the second driving substrate
Implementation Method 2
The dimming liquid crystal panel has a plurality of partition areas due to the arrangement and disposition of the independent electrodes. Each of the independent electrodes is connected to the first signal pad through the first wire, and each of the independent electrodes receives a driving signal via the single first wire and the single first signal pad. According to the driving signal, the light transmittance of each of the partition areas can be controlled independently
Data Source
AI summary
A light source module includes an optical plate, a light source and a dimming liquid crystal panel. The dimming liquid crystal panel includes a first driving substrate, a second driving substrate and a liquid crystal material layer. The first driving substrate includes a first substrate and a common electrode. The second driving substrate includes a second substrate, independent electrodes, first signal pads, first wires, dummy wires and a transparent insulation layer. The first wires and dummy wires are disposed on the second substrate and covered by the transparent insulation layer, the first wires are exposed from the transparent insulation layer, the independent electrodes are insulated from each other, disposed on the transparent insulation layer and overlap the first wires and the dummy wires, and each independent electrode is electrically connected to one first signal pad via one first wire. A display device having the light source module is also provided.