LED Scan Line Grouping for Low-Grayscale Display Quality
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Solution Overview
Problem
Large LED display devices face reduced channel driving capability due to parasitic capacitance, leading to deteriorated low-grayscale image quality.
Innovation Solution
The implementation of N channel groups and M scan groups, each with controllers and voltage regulators, to manage current supply and scanning operations, including switches for controlling voltage transmission through specific scan lines, reduces parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large number of LED elements are disposed to implement large display devices, then the display size is increased, but channel driving capability is reduced due to LED parasitic capacitance
Solution Approach 1:
The scan lines are divided into multiple groups (first scan line group and second scan line group), with each group independently controlled by separate controllers. This segmentation reduces the parasitic capacitance burden on each channel, enabling large display devices to maintain reliable channel driving capability across the expanded area.
2Area of stationary object
If a large number of channels are operated in large LED display devices, then the display coverage is increased, but low-grayscale image quality deteriorates
Solution Approach 1:
By segmenting scan lines into separate groups with independent controllers, each controller can precisely manage the current supply to LED sub-pixels within its group. This enables accurate grayscale control even as display coverage increases, preventing image quality deterioration.
Solution Approach 2:
The patent implements dynamic control of scan lines through independent controllers that can adjust voltage levels and timing for each scan line group. This dynamic management ensures precise current supply to channel groups, maintaining low-grayscale image quality across large display areas.
3Reliability
If N channel groups and M scan groups with controllers and voltage regulators are implemented, then channel driving capability is improved, but device complexity increases
Solution Approach 1:
The patent segments scan lines into multiple groups, each with dedicated controllers and voltage regulators. While this increases component count, it systematically improves channel driving capability by reducing parasitic capacitance effects, making the complexity necessary for reliable large-display operation.
Solution Approach 2:
Each controller in the scan line groups is designed to perform multiple functions: controlling scan line activation, managing voltage levels through integrated voltage regulators, and coordinating current supply to channel groups. This multi-functionality reduces the need for separate dedicated components, optimizing the complexity-performance ratio.
Data Source
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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.