Micro-LED Display Power Management Against Unwanted Emission
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Solution Overview
Problem
Micro-LED display devices are prone to unwanted light-emission due to short circuits between the cathode and anode electrodes, leading to abnormal light emission and vertical line defects, which current technologies fail to adequately address.
Innovation Solution
A micro-LED display device with a power management circuit that controls the gap voltage difference between the negative and bias voltages to maintain it below the threshold voltage of the micro-LEDs, using a power management circuit to generate and manage these voltages, ensuring they remain below the threshold even in the presence of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a micro-LED is missing due to process problem, then the display device can still operate, but a short circuit may occur between cathode and anode electrodes causing unwanted micro-LEDs to emit light abnormally
Solution Approach 1:
The patent applies preliminary anti-action by pre-establishing a protection circuit that includes a protection transistor connected in parallel with the micro-LED. This transistor is configured to block current flow to adjacent micro-LEDs before a short circuit can cause unwanted emission. The protection circuit is activated in advance to prevent the harmful effect rather than reacting after the problem occurs.
Solution Approach 2:
The protection transistor serves as an intermediary element between the micro-LED and the driving circuitry. It mediates the current flow by providing a controlled path that prevents direct current leakage from causing unwanted emission in adjacent pixels, thereby isolating the harmful effect to a minimal extent.
2Ease of operation
If gap voltage between negative voltage and bias voltage is not controlled, then driving simplicity is maintained, but unwanted light emission occurs due to voltage exceeding threshold
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bias voltage level based on the operating mode. The protection circuit modifies the voltage parameters in real-time to ensure the gap voltage remains below the threshold voltage of the micro-LED, preventing unwanted emission while maintaining simple driving through automated voltage control.
3Adaptability or versatility
If gap voltage is not maintained constant during short circuit conditions, then circuit flexibility is preserved, but vertical line emission defects occur
Solution Approach 1:
The protection circuit incorporates feedback mechanisms that continuously monitor the voltage conditions across the micro-LED array. When a short circuit is detected or voltage thresholds are approached, the feedback loop automatically adjusts the bias voltage to maintain constant gap voltage, preventing vertical line emission defects while preserving circuit flexibility through automated regulation.
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 unwanted light-emission and reduces power consumption by maintaining the gap voltage below the threshold voltage, thereby preventing vertical line defects and ensuring stable operation under all driving conditions.
Implementation Method 1
a micro-LED display device comprising: a display panel including: a plurality of pixel circuits for driving a plurality of micro-LEDs
Data Source
AI summary
Disclosed is a micro-LED display device configured to prevent unwanted light-emission under all driving conditions regardless of a short circuit between a cathode electrode and an anode electrode of a micro-LED. The micro-LED display device includes a display panel including: a plurality of pixel circuits for driving a plurality of micro-LEDs; and a micro-driver for controlling an operation of each of the plurality of pixel circuits; and a power management circuit configured to manage a level of a bias voltage so that a gap voltage as a difference between a negative voltage and the bias voltage used to selectively drive one of the plurality of micro-LEDs is maintained at a value lower than a threshold voltage of each of the plurality of micro-LEDs.