Level Conversion Chip Protection Circuit for Display Panel Short-Circuit Safety
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Solution Overview
Problem
Conventional display panels face safety issues due to short circuits between scan and power lines, causing the level conversion chip to heat up or burn, especially when the overcurrent protection function is turned off during the display panel's startup, leading to excessive current flow.
Innovation Solution
A driving circuit with a protection unit is introduced between the level conversion chip and the intersection of the scan and power lines, which reduces current flow during short circuits, preventing excessive heating or burning of the chip. This protection unit can include constant or variable resistance elements or capacitors, and is strategically placed to mitigate current surges when the scan and power lines are short-circuited.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the overcurrent protection function is turned off during startup to allow larger current flow, then the display panel can be turned on normally, but the short-circuit equivalent resistance becomes very small causing large current that heats up or burns the level conversion chip
Solution Approach 1:
A protection unit is preliminarily configured in the circuit between the level conversion chip and the intersection of scan and power lines. This protection unit includes protection resistors that are预先 set to limit current during short-circuit conditions. When the display panel starts up, the protection unit is already in place to prevent excessive current from damaging the level conversion chip, while still allowing the OCP function to be temporarily disabled for normal operation.
Solution Approach 2:
The protection unit acts as an intermediary element between the level conversion chip and the potential short-circuit point at the intersection of scan and power lines. The protection resistors in this intermediary unit limit the current flow during short-circuit conditions, preventing the harmful effect of excessive current from reaching the level conversion chip, while allowing the startup process to proceed normally.
2Illumination intensity
If metal traces are made thinner to improve display effect, then the display quality is improved, but the traces are more prone to short circuits due to collision
Solution Approach 1:
The protection unit with protection resistors is preliminarily configured in the circuit to compensate for the vulnerability of thinner metal traces. Even though the traces are thin and more prone to short circuits, the protection unit is already in place to limit current during such events, preventing catastrophic failure and allowing the display to maintain high quality with thin traces.
Solution Approach 2:
The protection resistors in the protection unit provide beforehand cushioning against the potential harmful effects of short circuits. By having this protection in advance, the system can withstand trace collisions and short circuits without causing the level conversion chip to overheat or burn, thus enabling the use of thinner, higher-quality traces.
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
The protection unit effectively limits current flow between the power line and the level conversion chip, preventing overheating and burning, thus enhancing the safety and reliability of the display panel by ensuring the level conversion chip operates within safe current limits even during short circuits.
Implementation Method 1
a short-circuit problem can cause local heating or even burning of the display panel
Data Source
AI summary
A driving circuit and a display device are provided. The driving circuit includes a level conversion chip, a scan line, a data line, a power line, a first transistor, a second transistor, and a light emitting unit. A protection unit is disposed between the level conversion chip and an intersection of the scan line and the power line, and the protection unit is configured to reduce current between the level conversion chip and the power line when the scan line and the power line are short-circuited. In the embodiment of the present disclosure, when the scan line and the power line are short-circuited, the protection unit reduces the current between the power line and the level conversion chip to prevent excessive current between the level conversion chip and the power line, and prevent the level conversion chip from heating and burning.