Array Substrate Pixel Driving for Uniform Micro-LED Brightness
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Solution Overview
Problem
Mini and micro inorganic light-emitting diodes face poor brightness uniformity due to requiring large current density, which existing pixel circuits formed by thin film transistors cannot efficiently manage, leading to high power consumption and poor uniformity.
Innovation Solution
An array substrate with a display region containing sub-pixels of at least three colors driven by a pixel driving chip, connected to inorganic light-emitting diodes via data, scanning, and reference signal lines, allowing for time-division signal writing and reduced power consumption by optimizing signal distribution across positive electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin film transistor pixel circuits are used to drive mini and micro inorganic light-emitting diodes, then the device structure is simple and manufacturing is easier, but brightness uniformity deteriorates and power consumption increases
Solution Approach 1:
The patent changes the driving parameters by introducing a pixel driving chip that can provide large current density (e.g., 100 mA/inch or higher) compared to conventional thin film transistor circuits. This parameter change enables the micro inorganic light-emitting diodes to operate in a regime where they achieve uniform brightness, resolving the contradiction between ease of manufacture and brightness uniformity.
Solution Approach 2:
The patent introduces a pixel driving chip as an intermediary component between the signal lines and the micro inorganic light-emitting diodes. This intermediary chip performs signal processing and provides the necessary high current density, enabling the simple TFT structure to drive high-performance LEDs while maintaining brightness uniformity.
2Device complexity
If thin film transistor pixel circuits are used to drive mini and micro inorganic light-emitting diodes, then device structure is simpler, but power consumption increases
Solution Approach 1:
The pixel driving chip changes the electrical parameters by providing optimized current driving capability with high efficiency. It can deliver large current density when needed while maintaining low power consumption through optimized drive waveforms and timing control, resolving the contradiction between device complexity and power consumption.
Solution Approach 2:
The pixel driving chip employs periodic scanning to drive the display, where it sequentially updates pixel rows or columns. This periodic action allows the chip to maintain low average power consumption while providing high peak current when needed for LED activation, thus resolving the power consumption contradiction.
3Manufacturing precision
If large current density is applied to micro inorganic light-emitting diodes, then brightness uniformity improves, but power consumption increases
Solution Approach 1:
The pixel driving chip uses periodic scanning to activate different pixel rows or columns sequentially. This time-division multiplexing approach allows each LED to receive high current density during its active period for uniform brightness, while the overall power consumption remains low because not all LEDs are activated simultaneously.
Solution Approach 2:
The pixel driving chip dynamically changes current parameters, providing high current density only when and where needed for brightness uniformity, while maintaining low current during inactive periods. This dynamic parameter control resolves the contradiction between brightness uniformity and power consumption.
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 solution enables direct driving of all pixels by pixel driving chips, achieving large current density for micro inorganic light-emitting diodes, improving brightness uniformity and reducing power consumption.
Implementation Method 1
each of the sub-pixels includes at least one inorganic light-emitting diode
Implementation Method 2
An inorganic light-emitting diode emits light on the basis of a metal semiconductor
Data Source
AI summary
An array substrate, a detection method for the array substrate, and a tiled display panel. In the array substrate, each of pixels (1) comprises sub-pixels (01) of at least three colors and a pixel driving chip (02) for driving each sub-pixel (01) to emit light; each sub-pixel (01) comprises at least one inorganic light-emitting diode; a display area (A1) further comprises: a positive signal line (Hm) connected to a positive electrode of each inorganic light-emitting diode, and a data signal line (Dm), a scanning line (Sn), and a reference signal line (Vm) connected to each pixel driving chip (02); each pixel driving chip (02) is used for writing signals of the data signal line (Dm) into the sub-pixels (01) of different colors under the control of the corresponding scanning line (Sn) in a time division manner.