Power Source Circuit with Protector for LCD Voltage Regulation
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Solution Overview
Problem
High-speed driving schemes in liquid crystal displays (LCDs) lead to increased power consumption and operating temperatures, which can result in operation failures due to excessive heat.
Innovation Solution
A power source circuit incorporating a voltage divider, operational amplifier, switches, and a protector to generate and regulate supply voltages, reducing power consumption and preventing overheating by controlling the operation of the power generators based on the magnitude of the driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the supply voltage AVDD is increased to improve image quality and support high-speed driving, then the driving capability is improved, but the power consumption increases and operating temperature rises
Solution Approach 1:
The patent implements dynamic voltage switching between high voltage mode (for high-speed driving) and low voltage mode (for power saving). The voltage selector dynamically chooses the appropriate voltage level based on driving requirements, allowing the system to adapt between performance and power consumption needs rather than operating at a fixed high voltage level.
Solution Approach 2:
The patent employs periodic switching between different voltage levels and operational modes. The controller alternates between active driving phase (high voltage) and standby/power-saving phase (low voltage), creating a periodic operation pattern that reduces average power consumption while maintaining high-speed capability when needed.
2Reliability
If the supply voltage AVDD is increased to improve image quality, then the driving capability is improved, but the operating temperature increases causing operation failure
Solution Approach 1:
The system dynamically adjusts operating voltage based on thermal conditions and driving requirements. By switching between high-voltage mode (for image quality) and low-voltage mode (for thermal management), the system maintains reliability through adaptive voltage control that responds to temperature conditions.
Solution Approach 2:
The patent implements protective circuits and control logic that preemptively prevent overheating before it causes operation failure. The voltage selector and controller are designed to detect and respond to thermal conditions, switching to lower voltage modes before critical temperature thresholds are reached, thus preventing rather than merely responding to failures.
3Productivity
If continuous high-voltage operation is used to maintain driving performance, then the driving capability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic switching between active high-performance mode and standby power-saving mode. During active periods, high voltage provides full driving performance; during standby periods, low voltage reduces power consumption. This periodic alternation maintains average productivity while significantly reducing energy loss compared to continuous high-voltage operation.
Solution Approach 2:
The system dynamically transitions between different performance levels based on actual driving needs. The voltage selector and controller enable the system to scale its operating performance matchingly with demand, avoiding continuous high-power operation and reducing energy loss while maintaining productivity when required.
Data Source
AI summary
A power source circuit of a display apparatus includes a voltage divider, an operational amplifier, a first switch, a second switch, and a protector. The voltage divider generates a divided voltage between a first driving voltage and a ground voltage. The operational amplifier receives the divided voltage and outputs the divided voltage as a second driving voltage. The first switch is connected between a first supply voltage terminal to receive the first driving voltage and a common node. The second switch is connected between the common node and a second supply voltage terminal to receive the ground voltage. The protector is connected to the common node to limit a voltage output of the first supply voltage terminal in response to a voltage of the common node.