Display Power Supply Short-Circuit Test Logic
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face the risk of short-circuit accidents and reduced display quality due to frequent unwanted short-circuit tests, which can cause abnormal luminance issues even when the power voltage is small.
Innovation Solution
A display device with a power supply system that includes a first and second power voltage, a shut-down determiner, and a method to reliably perform short-circuit testing by comparing voltages and shutting down the power supplies when certain reference voltages are exceeded, allowing for differentiated display modes to prevent unwanted short-circuit tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If short-circuit test is frequently performed, then safety against short-circuit accidents is improved, but display quality deteriorates due to abnormal luminance
Solution Approach 1:
The system dynamically adjusts the power voltage magnitude based on operational context. During short-circuit tests, the power voltage is increased to a first magnitude for reliable detection, while during normal display operations, it is reduced to a second magnitude to prevent abnormal luminance. This dynamic adjustment resolves the contradiction between safety testing and display quality.
Solution Approach 2:
The patent changes the parameter of power voltage magnitude between two distinct levels: a first magnitude for short-circuit testing and a second magnitude for normal operation. By controlling the power supply to switch between these magnitudes based on operational mode, the system achieves both reliable short-circuit detection and maintains normal display quality.
2Illumination intensity
If short-circuit test is performed with small power voltage, then display quality is maintained, but reliability of short-circuit detection deteriorates
Solution Approach 1:
The system dynamically adjusts the power voltage magnitude based on operational context. During short-circuit tests, the power voltage is increased to a first magnitude for reliable detection, while during normal display operations, it is reduced to a second magnitude to prevent abnormal luminance. This dynamic adjustment resolves the contradiction between safety testing and display quality.
Solution Approach 2:
The patent changes the parameter of power voltage magnitude between two distinct levels: a first magnitude for short-circuit testing and a second magnitude for normal operation. By controlling the power supply to switch between these magnitudes based on operational mode, the system achieves both reliable short-circuit detection and maintains normal display quality.
3Reliability
If power voltage is increased for reliable short-circuit testing, then detection reliability is improved, but risk of short-circuit accidents increases
Solution Approach 1:
The system dynamically adjusts the power voltage magnitude based on operational context. During short-circuit tests, the power voltage is increased to a first magnitude for reliable detection, while during normal display operations, it is reduced to a second magnitude to prevent abnormal luminance. This dynamic adjustment resolves the contradiction between safety testing and display quality.
Solution Approach 2:
The system performs short-circuit tests before normal power supply operations. By conducting the test in advance when the display is not yet fully powered or is in a test mode, the system can detect short-circuits using higher voltage without exposing the full display system to dangerous conditions during normal operation.
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
Enables reliable short-circuit testing even with small power voltages, preventing accidents and maintaining display quality by ensuring short-circuit tests are only performed when necessary.
Implementation Method 1
a first comparator including a first input terminal connected to the second power line, and a second input terminal which receives the first reference voltage
Implementation Method 2
a second comparator including a first input terminal connected to the second power line, and a second input terminal which receives the second reference voltage
Implementation Method 3
a first gate including a first input terminal connected to an output terminal of the first comparator, and a second input terminal; and a second gate including a first input terminal which receives a short-circuit detection setting signal, and a second input terminal connected to the output terminal of the first gate
Data Source
AI summary
A display device includes: pixels, each of which is connected to a first power line and a second power line; and a power supply which, in a first display mode, supplies a first power voltage to the first power line and supplies a second power voltage to the second power line. The power supply includes: a first power supply which generates the first power voltage; a second power supply which generates the second power voltage; and a shut-down determiner which shuts down the first power supply and the second power supply in a case where the first power voltage is greater than a first reference voltage at a first time point, and the second power voltage is greater than a second reference voltage at a second time point.