Display Power Supply Layout Using High-Voltage Transfer
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Solution Overview
Problem
The existing power supply systems for display apparatuses face inefficiencies due to parasitic resistance in power lines and connectors, leading to significant current loss and decreased power efficiency, especially under high-load conditions like gaming or high-frequency operations, as they require separate voltage transfers and buck-conversion, which complicates the voltage transfer system and reduces overall power conversion efficiency.
Innovation Solution
A power supply system that transfers a high-level system voltage directly from the system board to the control board without buck-conversion, using a driving circuit to boost the voltage for the backlight and a power management circuit to generate operating voltages, thereby reducing parasitic resistance-induced losses and simplifying the voltage transfer system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power lines and connectors are used to transfer system voltage and power supply voltage from system board to control board, then voltage transfer is achieved, but device complexity increases and power efficiency decreases due to parasitic resistance
Solution Approach 1:
The patent merges the transfer of system voltage and power supply voltage into a single power line. The system board transfers only system voltage through one power line, and the control board generates both backlight voltage and operating voltages using integrated circuits that perform multiple voltage conversions internally, eliminating the need for separate power lines and connectors for each voltage type.
Solution Approach 2:
The control board's integrated voltage generation system serves multiple functions: it receives system voltage and generates both backlight voltage (for LED backlight units) and operating voltages (for display panel and control circuits) through a single unified power management architecture, making the power transfer system universal for all voltage requirements.
2Power
If buck-conversion is performed to generate power supply voltage from system voltage, then operating voltages can be provided, but current loss increases due to parasitic resistance and power efficiency decreases
Solution Approach 1:
The patent extracts the buck-conversion operation from the system board and relocates it to the control board. Instead of performing buck-conversion on the system board and transferring the converted voltage, the system board transfers high-level system voltage directly, and the control board performs the buck-conversion locally using integrated circuits, thereby minimizing current loss in power lines.
Solution Approach 2:
The control board acts as an intermediary that receives high-level system voltage and internally performs the necessary voltage conversions. This intermediary approach allows the system to maintain high voltage during transfer (reducing current and parasitic losses) while still providing the required low-level operating voltages through integrated conversion circuits on the control board.
3Power
If system voltage is transferred through power lines and connectors to control board, then power supply is achieved, but voltage drop occurs due to parasitic resistance especially under high load conditions
Solution Approach 1:
The patent changes the voltage level parameter during transfer by maintaining high system voltage levels in the power line rather than converting to lower voltages before transfer. By keeping the voltage high during transmission and performing conversion at the destination, the system minimizes voltage drop and current loss, improving voltage stability especially under high load conditions.
4Adaptability or versatility
If multiple voltage transfers are performed between system board and control board, then all required voltages are provided, but the number of power lines and connectors increases
Solution Approach 1:
The patent merges multiple voltage transfer functions into a single power line interface. The system board transfers only system voltage through one power line, and the control board integrates the functions of generating backlight voltage and operating voltages within its own circuitry, thereby reducing the number of power lines and connectors while maintaining full voltage provision capability.
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 approach enhances power efficiency by minimizing voltage drops and current losses, even under high loads, and simplifies the power transfer system, while also reducing the complexity and current consumption by using a single chip for both backlight and operating voltage generation.
Implementation Method 1
a driving circuit configured to receive a system voltage and boost the system voltage to provide a backlight voltage for backlight
Implementation Method 2
a power management circuit configured to receive the system voltage in parallel with the driving circuit, and generate operating voltages for display of a screen, by using the system voltage
Data Source
AI summary
A power supply system for a display apparatus, in which a structure for supplying operating voltages for a display panel is improved, and the power supply system may improve power efficiency by generating operating voltages using a system voltage of a high level.