Micro LED Short Circuit Detection and Protection Circuit
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Solution Overview
Problem
In Micro LED display devices, the transfer process from the growth substrate to the display device substrate often results in short circuits due to cathode and anode silver glue issues, leading to potential back plate burning and low product yield.
Innovation Solution
A light emitting control circuit is introduced, comprising a driving switch device connected to the anode of the light emitting device and a detection circuit that checks for short circuits, turning off the driving switch if a short circuit is detected to prevent back plate damage and ensuring normal light emission if no short circuit is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transfer printing is used to assemble Micro LED devices onto display device substrate, then large-size display screens can be achieved, but short circuits occur due to cathode and anode silver glue issues
Solution Approach 1:
The patent implements a detection circuit that performs short circuit detection before the light emitting stage. The detection circuit includes a detection switch device connected in parallel with the light emitting device, and a detection signal terminal that applies a detection voltage to detect short circuits in advance. This preliminary detection prevents short circuit damage before it occurs during normal operation.
Solution Approach 2:
The patent introduces a detection circuit as an intermediary between the control circuit and the light emitting device. This detection circuit includes a detection switch device and detection signal terminal that act as a mediator to detect short circuits without affecting the normal light emitting function. The detection circuit intermediates the control process by providing short circuit status information to the control circuit.
2Object-affected harmful factors
If short circuit detection is implemented, then back plate burning is prevented, but device complexity increases
Solution Approach 1:
The patent merges the detection function with the existing driving circuit structure. The detection switch device is integrated into the same pixel circuit as the light emitting device, sharing common terminals and control logic. This merging approach adds detection capability without significantly increasing overall device complexity.
Solution Approach 2:
The detection circuit components serve multiple functions: the detection switch device can be turned on for detection and turned off for normal light emitting operation, and the detection signal terminal can provide both detection voltage and control signals. This multi-functionality reduces the need for separate dedicated detection components.
Data Source
AI summary
The present disclosure provides a light emitting control circuit, an array substrate and a display device, and a driving method of the light emitting control circuit. The light emitting control circuit includes: a light emitting device; a driving circuit including a driving switch device configured to drive the light emitting device to emit light when the driving switch device is turned on; a detection circuit, configured to detect whether the light emitting device is short-circuited in the detection stage of the light emitting control circuit; if the light emitting device is short-circuited, the driving switch device is turned off in the light emitting stage of the light emitting control circuit; if the light emitting device is not short-circuited, the driving switch device is turned on in the light emitting stage of the light emitting control circuit.