LED Backlight Connector Placement for Uniform Illumination
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Solution Overview
Problem
In liquid crystal display devices using light-emitting diodes as backlights, the presence of connectors leads to gaps where light-emitting diodes are absent, resulting in decreased brightness and non-uniform illumination.
Innovation Solution
The arrangement of first and second light-emitting diodes on opposite sides of a light guide plate, with connectors positioned to avoid each other, ensures that no area lacks a light source, maintaining brightness by having diodes on both sides of the plate and using substrates divided to accommodate connectors without opposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connector is disposed on a side surface of the light guide plate to electrically connect light-emitting diodes, then the connector can perform its electrical connection function, but the brightness decreases in the region where the connector is disposed because no light-emitting diode exists there
Solution Approach 1:
The patent applies asymmetry by configuring connectors and light-emitting diodes on opposite side surfaces of the light guide plate rather than on the same side. Specifically, first connectors are disposed on a first side surface while second connectors are disposed on a second side surface opposite to the first side surface. This asymmetric arrangement ensures that connectors do not overlap with light-emitting diode positions, eliminating the brightness decrease problem while maintaining electrical connection reliability.
2Illumination intensity
If light-emitting diodes are arranged at equal pitches to achieve uniform brightness, then the brightness uniformity is improved, but the connector cannot be disposed without overlapping with light-emitting diode positions
Solution Approach 1:
The patent resolves the placement conflict by transitioning from a one-dimensional arrangement (all components on one side surface) to a three-dimensional arrangement utilizing both side surfaces of the light guide plate. First light-emitting diodes and first connectors are arranged on the first side surface, while second light-emitting diodes and second connectors are arranged on the second side surface. This dimensional expansion allows equal pitch arrangement of light-emitting diodes for uniform brightness without connector overlap issues.
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 achieves uniform brightness in the backlight by ensuring that all areas of the light guide plate receive light from diodes, reducing the impact of connector placement on illumination.
Implementation Method 1
A plurality of first light-emitting diodes, which are disposed so as to be opposed to a first side surface of the light guide plate
Implementation Method 2
a light guide plate, which is provided to form an edge-light type backlight
Data Source
AI summary
Provided is a liquid crystal display device, including: a light guide plate; first light-emitting diodes and a first connector, which are opposed to a first side surface of the light guide plate; a first substrate on which the first light-emitting diodes and the first connector are mounted; second light-emitting diodes and a second connector, which are opposed to a second side surface of the light guide plate, the second side surface being on a side opposite to the first side surface; and a second substrate on which the second light-emitting diodes and the second connector are mounted, in which: the first connector is opposed to any one of the second light-emitting diodes; the second connector is opposed to any one of the first light-emitting diodes; and the first connector and the second connector are disposed without being opposed to each other.