Display Device Short Circuit Detection and Protection
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Solution Overview
Problem
Display devices, such as LCDs, are prone to malfunctions due to short circuits between wiring, particularly between power voltage and clock signal wires, leading to excessive current flow and potential ignition.
Innovation Solution
A display device and driving method that include a short detector to monitor the power voltage level and generate enable signals to control the operation of the signal controller and power supply, mitigating the risk of short circuit-induced malfunctions by managing the switching transistor and voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wires are disposed adjacent to each other to decrease unnecessary area, then area utilization is improved, but short circuit risk increases
Solution Approach 1:
A short detector circuit is introduced as an intermediary component between the power voltage wire and clock signal wire. This detector monitors voltage levels and generates enable signals to prevent short circuits, allowing wires to be disposed adjacently while maintaining reliability through active protection rather than physical separation.
2Reliability
If short circuit detection and protection mechanisms are added, then reliability is improved, but device complexity increases
Solution Approach 1:
The short detector circuit performs self-service by autonomously monitoring voltage levels and generating appropriate enable signals without requiring external control. The circuit uses its own internal components (switching transistors, voltage level detectors) to detect short circuits and activate protection mechanisms, reducing the need for additional complex control systems.
3Power
If excessive current flows through shorted wires, then power delivery is improved, but thermal damage risk increases
Solution Approach 1:
The short detector circuit performs preliminary detection of voltage levels before excessive current can cause thermal damage. By monitoring the voltage level and generating enable signals in advance, the system prevents short circuits from developing into thermal hazards, addressing the problem before it manifests as physical damage.
Data Source
AI summary
A display device includes: a plurality of pixels; a scan driver configured to apply a scan signal to a plurality of scan lines connected to the plurality of pixels; a data driver configured to apply a gray voltage to a plurality of data lines connected to the plurality of pixels; a signal controller configured to transmit a scan control signal for controlling operating of the scan driver to the scan driver, and configured to transmit a data control signal for controlling operating of the data driver to the data driver; a power supply configured to supply a power voltage for generation of the scan signal to the scan driver; and a short detector configured to detect a voltage level of the power voltage and generate an enable signal in response to the detection.