MicroLED Display Panel Sub-Region Segmentation for Driver Loading
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Solution Overview
Problem
Existing microLED display panels face challenges with thermal mismatch between flip chip technology and CMOS processes, leading to small drive currents and malfunctions in large-size or high-resolution displays, especially due to leakage currents and increased loading and delay in passive matrix driving schemes.
Innovation Solution
A microLED display panel using a passive driving method with a substrate divided into sub-regions and corresponding drivers, incorporating a low-dropout regulator and integrated column and row drive circuits to reduce loading, simplify manufacturing, and minimize leakage current effects, allowing for larger and higher-resolution displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active matrix using thin-film transistors (TFT) is used to drive microLEDs, then the display panel can be driven with better control, but thermal mismatch occurs between flip chip technology and CMOS process
Solution Approach 1:
The substrate is divided into a plurality of sub-regions, with drivers correspondingly disposed on surfaces of the sub-regions. This segmentation reduces the loading on individual drivers and avoids thermal mismatch issues while maintaining drive control capability.
2Ease of manufacture
If passive matrix driving method is used, then the manufacturing process is simplified and turn-on time is reduced, but output loading and delay increase when display panel size or resolution increases
Solution Approach 1:
The substrate is divided into multiple sub-regions with drivers disposed on each sub-region surface. This segmentation reduces the output loading and delay by distributing the driving tasks across multiple drivers, while maintaining the simplicity of the passive matrix manufacturing process.
3Loss of time
If passive matrix driving method is used, then turn-on time of microLEDs is reduced, but leakage current significantly affects gray display
Solution Approach 1:
The substrate is divided into multiple sub-regions with drivers on each sub-region. This segmentation increases the drive current capability while maintaining fast turn-on time, and the low-dropout regulator minimizes leakage current effects on gray display.
Solution Approach 2:
A low-dropout regulator is used to change the power regulation parameters, minimizing leakage current effects and improving gray display performance while maintaining fast turn-on characteristics.
4Measurement precision
If display panel size or resolution is increased, then the display quality is improved, but output loading and delay of drive circuits increase causing malfunction
Solution Approach 1:
The substrate is divided into multiple sub-regions with drivers correspondingly disposed on each sub-region surface. This segmentation reduces the loading and delay on individual drive circuits, enabling large-size high-resolution display panels to function properly.
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 effectively reduces driver loading, shortens turn-on time, increases drive current, and minimizes the impact of leakage current on gray display, making large-size high-resolution microLED displays feasible while maintaining the advantages of microLED technology.
Implementation Method 1
The driver includes a low-dropout (LDO) regulator and a drive circuit, the LDO regulator receiving a system power, according to which a regulated power is generated and provided to the drive circuit
Implementation Method 2
The driver includes a column drive circuit, which transmits column drive signals to first electrodes of the microLEDs on same columns via column conductive wires
Implementation Method 3
a row drive circuit, which transmits row drive signals to second electrodes of the microLEDs on same rows via row conductive wires
Implementation Method 4
a microLED display panel includes a plurality of microLEDs
Implementation Method 5
micro light-emitting diode (microLED, mLED or μ LED) display panel
Data Source
AI summary
A microLED display panel includes a substrate being divided into a plurality of sub-regions for supporting microLEDs, and a plurality of drivers being correspondingly disposed on surfaces of the sub-regions respectively. The driver includes a low-dropout (LDO) regulator and a drive circuit. The LDO regulator receives a system power, according to which a regulated power is generated and provided for the drive circuit.