Display Panel PWM Chip Layout for Uniform Mini-LED Brightness
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Solution Overview
Problem
In mini-LED and micro-LED displays, signal delay due to long wiring lengths results in poor brightness uniformity, as light-emitting diodes farther from the driver IC experience different signal impedance compared to those closer, leading to inconsistent display performance.
Innovation Solution
A display panel design featuring a substrate with a light-emitting diode (LED) array and a pulse-width modulation chip array, where each LED unit is connected to a pulse-width modulation chip in a one-to-one correspondence, allowing the chips to adjust the light-emitting duration of the LEDs to control grayscale and reduce signal delay by maintaining consistent distances between chips and LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver IC is arranged on the periphery of the display panel with long wiring lengths to connect LED units, then the device complexity is reduced and ease of operation is improved, but signal delay increases and brightness uniformity deteriorates
Solution Approach 1:
The driver IC is segmented into multiple pulse-width modulation chips distributed across the display region, with each chip controlling a specific group of LED units. This segmentation reduces wiring lengths and signal delay while maintaining ease of operation through modular control architecture.
Solution Approach 2:
The driver IC is transitioned from a peripheral arrangement to an in-display arrangement by embedding pulse-width modulation chips within the display region. This dimensional change from edge-based to area-based distribution reduces wiring lengths and improves signal integrity while maintaining control functionality.
2Device complexity
If the driver IC is arranged on the periphery with long wiring lengths, then device complexity is reduced, but signal impedance varies across LED units causing poor brightness uniformity
Solution Approach 1:
The monolithic driver IC is segmented into multiple distributed pulse-width modulation chips, each handling a portion of the LED units. This reduces the complexity of long wiring connections while ensuring uniform signal impedance across all LED groups through localized control.
Solution Approach 2:
Each pulse-width modulation chip is positioned to control nearby LED units, creating local control zones with optimized wiring lengths and consistent signal impedance. This local quality approach ensures uniform brightness across different regions of the display.
3Reliability
If pulse-width modulation chips are positioned close to LED units for one-to-one correspondence, then signal delay is reduced and brightness uniformity is improved, but device complexity increases
Solution Approach 1:
Multiple LED units are grouped and controlled by corresponding pulse-width modulation chips in a systematic one-to-one mapping. This merging approach reduces the total number of individual connections while maintaining short wiring lengths and consistent signal characteristics across all LED groups.
Data Source
AI summary
A display panel and its fabrication method, and a display device are provided in the present disclosure. The display panel includes a substrate, including a display region; a light-emitting diode (LED) array at the display region, where the LED array includes a plurality of LED units arranged in an array; and a pulse-width modulation chip array at the display region, where the pulse-width modulation chip array includes a plurality of pulse-width modulation chips arranged in an array. The plurality of LED units is electrically connected to the plurality of pulse-width modulation chips in a one-to-one correspondence; and a pulse-width modulation chip of the plurality of pulse-width modulation chips is configured to adjust a light-emitting duration of a corresponding LED unit electrically connected thereto.