LED Scan-Line Control for Parasitic Capacitance in Large Displays

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Solution Overview

Problem

Large LED display devices face reduced channel driving capability and deteriorating low-grayscale image quality due to parasitic capacitance.

Innovation Solution

The solution involves an LED display device with N channel groups and M scan groups, each equipped with controllers, voltage regulators, and switches to manage voltage levels and scanning operations, reducing parasitic capacitance by rapidly increasing scan voltage through additional controllers on each scan line.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a large number of modular LED elements are disposed to implement large display devices, then the display size and coverage are improved, but channel driving capability is reduced due to LED parasitic capacitance

Engineering Contradiction:

Improvedisplay sizeVSAvoidchannel driving capability

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent segments the scan lines into multiple groups (first scan line group and second scan line group) and assigns different voltage levels to each group. This segmentation allows independent voltage control for different scan line groups, reducing the overall parasitic capacitance effect on each channel and improving channel driving capability while maintaining large display size

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different voltage levels (first voltage level and second voltage level) are applied to different scan line groups based on their specific requirements. This local quality approach optimizes the driving capability for each region of the display, compensating for parasitic capacitance effects locally rather than uniformly across the entire display

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If a large number of channels are operated in large LED display devices, then the display coverage is improved, but low-grayscale image quality characteristics deteriorate

Engineering Contradiction:

Improvedisplay coverageVSAvoidlow-grayscale image quality

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

Scan lines are divided into multiple groups with different voltage levels to reduce parasitic capacitance effects. This segmentation enables better control of current through channel groups, improving the precision of low-grayscale image quality while maintaining large display coverage

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the voltage level parameter by applying different voltage levels (first voltage level and second voltage level) to different scan line groups. This parameter change reduces parasitic capacitance effects and improves the driving capability for low-grayscale image quality in large display devices

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260065830A1LED display device and method of controlling the same

Publication Date: 2026.03.05 LX SEMICON CO LTD

AI summary

A light emitting diode (LED) display device according to one embodiment of the present invention includes a plurality of LED sub-pixels, N channel groups configured to supply a current to the plurality of LED sub-pixels, and M scan groups configured to perform a scanning operation. Particularly, the M scan groups include, for example, controllers, each of which corresponds to one preset scan line.