Display Device Power Supply Voltage Sensing and Control
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Solution Overview
Problem
Conventional display device power supply protection functions are ineffective during the initial driving period, leading to potential damage and abnormal light emission due to abnormal voltage states in the display panel.
Innovation Solution
A display device with a first power supply that senses the voltage of a second power supply line and controls the data driving voltage based on the sensed voltage, including a voltage converter and a voltage controller with a comparator and determiner to prevent damage by stopping the data driving voltage when an abnormal voltage is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power supply protection function is performed only during driving period, then the protection function is simple to implement, but abnormal voltage states during initial driving period cannot be detected and prevented
Solution Approach 1:
The first power supply performs preliminary protection actions during the initial driving period by sensing the voltage of the second power supply line before the second power supply starts generating voltage. This preliminary sensing and control mechanism prevents abnormal voltage states from occurring in the first place, extending protection coverage to the startup phase without requiring complex additional hardware.
2Reliability
If the first power supply continuously monitors and controls voltage during initial driving period, then protection against abnormal voltage is improved, but energy consumption and system complexity increase
Solution Approach 1:
The first power supply performs voltage sensing and control operations periodically during the initial driving period rather than continuously. The sensing is activated at specific intervals or at key moments in the startup sequence, allowing the system to maintain adequate protection while reducing energy consumption compared to continuous monitoring.
3Reliability
If the first power supply controls data driving voltage based on sensed voltage, then protection of the second power supply is improved, but the control system complexity increases
Solution Approach 1:
The first power supply implements a feedback mechanism where it senses the voltage of the second power supply line and uses this information to control the data driving voltage output. The sensed voltage serves as feedback that triggers appropriate control actions (such as adjusting or stopping voltage output) to prevent abnormal states, providing protection through a relatively simple closed-loop control system.
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
Prevents damage to the power supply and abnormal light emission by detecting and responding to abnormal voltage states during the initial driving period, ensuring safe operation of the display device.
Implementation Method 1
a voltage converter which converts a first input voltage supplied from an outside to generate the data driving voltage
Implementation Method 2
a comparator which compares the voltage of the second power supply line with a reference voltage
Data Source
AI summary
A display device includes a display panel which displays an image, a data driver which supplies a plurality of data signals to the display panel, a first power supply which supplies a data driving voltage to the data driver through a first power supply line, and a second power supply which supplies a first driving voltage to the display panel through a second power supply line. The first power supply senses a voltage of the second power supply line and controls the supply of the data driving voltage based on a sensed voltage during an initial driving period, in which the first power supply generates the data driving voltage and the second power supply does not generate the first driving voltage.