Sensor-Controlled Backlight Damping for Light Guide Expansion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reliability of position limitation for the light guide plate in backlight modules is compromised due to expansion in high-temperature and high-humidity environments, leading to rubber block extrusion and potential detachment, which affects the uniformity of backlight distribution.
Innovation Solution
A damping assembly with a pressure sensor and controller is integrated to adjust the damping force based on detected pressure, ensuring precise positioning of the light guide plate by using a piston rod, cylinder block, elastic members, and a controller to manage motion resistance and damping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber block is used to limit the position of the light guide plate, then the position limitation is simple and effective under normal conditions, but the reliability deteriorates in high-temperature and high-humidity environments due to light guide plate expansion causing rubber block extrusion and detachment
Solution Approach 1:
The patent applies the dynamics principle by making the damping force adjustable rather than fixed. The controller dynamically adjusts the damping force based on pressure sensor feedback, allowing the system to adapt to different environmental conditions (temperature and humidity variations) that cause light guide plate expansion. This resolves the contradiction by maintaining reliable position limitation under varying conditions without requiring multiple fixed-structure designs for different environments.
Solution Approach 2:
The patent implements feedback control through the pressure sensor that detects the expansion state of the light guide plate and sends signals to the controller. The controller then adjusts the damping force accordingly to maintain proper position limitation. This feedback mechanism ensures reliable position limitation under high-temperature and high-humidity conditions without overly complicating the overall structure, as the feedback is integrated into the existing damping assembly.
2Reliability
If the damping force is increased to prevent light guide plate detachment, then the position limitation reliability improves, but the risk of over-compression and damage to the light guide plate increases
Solution Approach 1:
The pressure sensor provides real-time feedback on the expansion state of the light guide plate, enabling the controller to adjust the damping force precisely. When expansion is detected, the damping force is increased to prevent detachment; when expansion subsides, the force is reduced to avoid over-compression and damage. This feedback-controlled approach resolves the contradiction by maintaining reliability while protecting the structural integrity of the light guide plate.
Solution Approach 2:
The patent changes the damping force parameter dynamically based on environmental conditions and light guide plate expansion state. Rather than using a fixed high damping force that could cause damage, the system adjusts the force parameter according to actual needs, ensuring both reliable position limitation and protection of the light guide plate's structural integrity.
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 enhances the reliability of position limitation for the light guide plate, maintaining uniform backlight distribution and reducing the risk of detachment, even in varying environmental conditions.
Implementation Method 1
one end of the damping assembly is provided with a pressure sensor, and the controller is respectively electrically connected with the pressure sensor and the damping assembly, and is configured to control a magnitude of a damping force of the damping assembly according to pressure data detected by the pressure sensor
Implementation Method 2
the damping assembly includes a piston rod, a cylinder block, and one or a plurality of elastic member(s) and a piston located in the cylinder block; the elastic member is connected between the cylinder block and the first end face of the piston
Implementation Method 3
a damping fluid is enclosed in the cylinder block; the controller is electrically connected with the piston, and is configured to control a magnitude of a motion resistance of the piston so as to control the magnitude of the damping force of the damping assembly
Data Source
AI summary
A backlight module and a display device. The backlight module includes: a back plate, a light guide plate, a damping assembly and a controller. Two ends of the damping assembly are abutted between an inner side wall of the back plate and an outer side wall of the light guide plate; one end of the damping assembly is provided with a pressure sensor, and the controller is respectively electrically connected with the pressure sensor and the damping assembly, and is configured to control a magnitude of a damping force of the damping assembly according to pressure data detected by the pressure sensor. The technical solutions provided in the present application may improve a reliability of position limitation of the light guide plate.