Superdense Micro-LED Drive Architecture for In-Pixel Demura
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Solution Overview
Problem
Display panels with micro-light emitting diodes (μLEDs) face issues with non-uniform light emission due to μLEDs operating outside specified parameters, leading to visible noise and the need for complex demura calibration processes that increase overhead in time, storage, and power consumption.
Innovation Solution
The solution involves controlling the gate terminal of a drive transistor in a pixel drive circuit to modulate the amplitude and pulse width of the current supplied to the μLED, using demura compensation values based on temperature and desired brightness, and storing these values in capacitors or transistors within the pixel drive circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If demura calibration process is applied to ensure uniformity of light emission, then light uniformity is improved, but overhead in time, storage, and power consumption increases
Solution Approach 1:
The patent applies preliminary action by performing demura calibration during the fabrication process and storing the compensation values in lookup tables or memory structures. This allows the calibration to be completed beforehand, eliminating the need for time-consuming post-fabrication calibration operations and reducing real-time processing requirements.
Solution Approach 2:
The patent implements self-service by enabling the display panel to perform its own calibration and compensation using stored lookup tables. The system uses the display's own operational data during fabrication to generate compensation values that are then applied automatically during operation, eliminating the need for external calibration equipment and reducing overall calibration overhead.
2Stability of the object's composition
If demura calibration process is applied to ensure uniformity of light emission, then light uniformity is improved, but storage requirements increase
Solution Approach 1:
The patent applies local quality by storing demura compensation values in localized lookup tables or memory structures associated with specific pixel regions or individual pixels. This allows the compensation data to be stored in a distributed manner across the display panel, reducing the need for a single large centralized storage system while maintaining the ability to provide precise per-pixel or per-region compensation.
3Stability of the object's composition
If demura calibration process is applied to ensure uniformity of light emission, then light uniformity is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by completing the computationally intensive demura calibration calculations during the fabrication process and storing the results in lookup tables. This eliminates the need for continuous real-time calculations during display operation, significantly reducing the power consumption required for maintaining uniform light emission across the display panel.
Solution Approach 2:
The patent implements self-service by enabling the display panel to use pre-computed compensation values stored in lookup tables during operation, rather than performing complex calibration calculations in real-time. This approach allows the system to maintain uniform light emission with minimal power consumption by simply retrieving and applying pre-stored compensation data.
4Loss of time
If demura compensation values are stored in capacitors or transistors within the pixel drive circuit, then latency is minimized, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the demura compensation storage functionality directly into the existing pixel drive circuit structure. The lookup tables or memory structures are combined with the drive transistor and capacitor elements that are already present in the pixel circuit, allowing compensation values to be stored and applied without adding separate, independent storage components. This reduces overall device complexity while maintaining low latency.
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
This approach reduces the overhead associated with demura calibration by applying demura compensation directly to the pixel drive circuit, saving power, minimizing latency, and expanding the dynamic range of the data without diminishing the data dynamic range.
Implementation Method 1
The invention relates to driving micro-light emitting diodes (μLEDs) and, more generally, to display panels that utilize arrays of light emitting diodes (LEDs) or micro-light emitting diodes (micro-LEDs or μLEDs).
Implementation Method 2
the demura compensation value is stored at a capacitor of the pixel drive circuit
Implementation Method 3
Display panels typically include arrays of large numbers of (e.g., up to one million or more) light emitting diodes (LEDs) or micro-light emitting diodes (micro-LEDs or μLEDs) that form pixels of a display.
Data Source
AI summary
The body node (gate terminal) of a drive transistor of a pixel drive circuit of a micro-light emitting diode (μLED) of a display is used to modulate an amplitude and a pulse width of a current supplied to the μLED by the pixel drive circuit. In some embodiments, the body node of the drive transistor of the μLED pixel drive circuit is used to modify the current through the drive transistor to apply a demura compensation. Applying demura compensation via the body node of the drive transistor of the pixel drive circuit saves power, memory, and dynamic range.