Mini LED Circuit Layout Using PWM for Greyscale and Lower Power
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Solution Overview
Problem
Current light emitting display technologies using mini LEDs or micro LEDs face high manufacturing costs and complex greyscale control issues due to passive matrix drive methods, and high power consumption with active matrix drive methods.
Innovation Solution
A light emitting device manufacturing method involving a substrate with a circuit layer including power signal lines and a pulse width modulation signal line, where switching elements and light emitting elements are connected, allowing for efficient greyscale control through pulse width modulation, reducing costs and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive matrix drive technique is used for mini LEDs or micro LEDs, then manufacturing cost is high, but the structure is simpler
Solution Approach 1:
The patent divides the LED array into multiple independent zones, each controlled by its own switching element. This segmentation allows each zone to be driven independently with simple PWM control, avoiding the complex matrix routing required by passive matrix drive while maintaining manufacturing feasibility.
Solution Approach 2:
The patent employs pulse width modulation (PWM) signaling to control the switching elements, using periodic on/off pulses to regulate LED brightness. This periodic control method simplifies the drive circuit compared to passive matrix while enabling precise greyscale control and reducing power consumption.
2Ease of operation
If active matrix drive technique is used for mini LEDs or micro LEDs, then greyscale control is easier, but power consumption is high
Solution Approach 1:
The patent uses PWM signaling to control LED brightness, replacing continuous analog voltage control with periodic digital pulses. This approach maintains easy greyscale control through duty cycle adjustment while significantly reducing average power consumption compared to active matrix drive methods that require continuous current supply.
Solution Approach 2:
The patent replaces the complex active matrix transistor network with simpler switching elements controlled by PWM signals. This substitution maintains greyscale control capability while eliminating the high static power consumption inherent in active matrix drive architectures.
3Ease of operation
If active matrix drive technique is used for mini LEDs or micro LEDs, then greyscale control is easier, but manufacturing cost is high
Solution Approach 1:
The patent segments the LED array into zones with individual switching elements, eliminating the need for complex active matrix transistor structures. This segmentation maintains greyscale control through PWM while dramatically simplifying manufacturing processes and reducing costs.
Solution Approach 2:
The patent employs simple switching elements and PWM control circuitry that are cheaper and easier to manufacture than active matrix transistor structures. While the switching elements have limited functional complexity, they provide sufficient greyscale control through PWM at a fraction of the manufacturing cost of active matrix designs.
Data Source
AI summary
Provided are a light emitting device and manufacturing method thereof, a backlight module, a display panel and a display device. The manufacturing method includes: providing a substrate; forming a circuit layer on a side of the substrate; providing at least one switching element and at least one light emitting element; and electrically connecting the switching element and the light emitting element to the circuit layer. The circuit layer includes a first power signal line, a second power signal line, and a pulse width modulation signal line; the switching element includes a control terminal, a first terminal and a second terminal; the light emitting element is electrically connected between the first terminal and the first power signal line, or the light emitting element is electrically connected between the second terminal and the second power signal line.