External AC Adapter Segments Power and Backlight Modules
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Solution Overview
Problem
Conventional LED-backlit LCD devices have limited design flexibility and high repair costs due to integrated AC-to-DC converting and backlight driving modules, and there is a need for a solution to reduce inventory risks by enabling the use of a single backlight driving module across different types of LCD devices.
Innovation Solution
An LCD system with an AC adapter that includes a backlight driving module and an AC-to-DC converting module, where the AC-to-DC converting module powers both the video processing and backlight driving modules, and the backlight driving module generates a signal to control the LED backlight, allowing for flexible design and reduced repair costs by separating these components from the LCD device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the AC-to-DC converting module and backlight driving module are embedded within the LCD device, then the device structure is integrated and compact, but the design flexibility is limited and repair costs increase
Solution Approach 1:
The patent divides the power supply system into separate modules: the AC-to-DC converting module and backlight driving module are separated from the LCD device and integrated into an external AC adapter. This segmentation allows the LCD device to maintain a simpler, more flexible design while the power conversion functions are handled externally, resolving the contradiction between integration and design flexibility.
Solution Approach 2:
The patent extracts the AC-to-DC converting module and backlight driving module from the LCD device and places them in an external AC adapter. This extraction enables the LCD device to be thinner and more design-flexible while the external adapter handles the power conversion and backlight driving functions, effectively resolving the technical contradiction.
2Reliability
If the AC-to-DC converting module and backlight driving module are embedded within the LCD device, then the device is self-contained, but the repair cost increases when modules are damaged
Solution Approach 1:
By extracting the AC-to-DC converting module and backlight driving module from the LCD device and placing them in an external AC adapter, the patent enables easy replacement of these modules without disassembling the LCD device. This extraction principle allows the LCD device to remain self-contained for display functions while the power conversion modules can be independently replaced, significantly reducing repair costs.
Solution Approach 2:
The patent enables the AC adapter with its embedded modules to be replaced as a separate unit when damaged. The LCD device can continue to function with a new AC adapter, effectively allowing the user to discard the damaged power conversion module and recover the valuable LCD device, thereby reducing overall repair costs.
3Adaptability or versatility
If different types of LCD devices use different backlight driving modules, then each device is optimized for its specific function, but inventory risk increases
Solution Approach 1:
The patent designs the AC adapter with a universal backlight driving module that can interface with different types of LCD devices through standardized connections and control protocols. The module can adapt to various LCD panel types (TN, IPS, VA) and backlight configurations, allowing a single module design to serve multiple device types, thereby reducing inventory requirements while maintaining device-specific optimization.
Solution Approach 2:
The backlight driving module in the AC adapter is designed to accept control signals that can adjust its output parameters (current, voltage, pulse width) to match the specific requirements of different LCD devices. By changing operational parameters rather than hardware configuration, the same module can be optimized for different device types, reducing the need for multiple specialized modules in inventory.
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 provides a flexible design for LCD devices, reduces repair costs by allowing external replacement of the AC adapter, and enables the same backlight driving module to be used across different types of LCD devices, thus reducing inventory risks and maintaining cost-effectiveness.
Implementation Method 1
The AC-to-DC converting module is coupled to the video processing module of the LCD device and the backlight driving module, is adapted to convert an AC line voltage into first and second DC voltages
Implementation Method 2
The backlight driving module is coupled to the LED backlight module of the LCD device, generates a backlight driving signal, and outputs the backlight driving signal to drive the LED backlight module
Data Source
AI summary
A liquid crystal display (LCD) system includes an LCD device and an alternating current (AC) adapter. The LCD device includes a video processing module and a light emitting diode (LED) backlight module. The AC adapter includes a backlight driving module and an AC-to-DC (direct current) converting module. The backlight driving module generates a backlight driving signal, and outputs the backlight driving signal to drive the LED backlight module of the LCD device. The AC-to-DC converting module is adapted to convert an AC line voltage into first and second DC voltages, and outputs the first and second DC voltages to power the video processing module of the LCD device and the backlight driving module, respectively.