LED Scan IC Control Using Non-Sequential Line Scanning for Flicker
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Solution Overview
Problem
Display devices using LEDs exhibit a flicker phenomenon due to sequential scanning of LEDs, causing user visual discomfort.
Innovation Solution
A display device with a controller that applies control signals with alternating clock intervals of different frequencies to non-sequentially scan LEDs, using a scan IC designed for sequential scanning, thereby reducing flicker by alternating high and low-frequency clock signals to improve scanning order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sequential scanning method is used to drive LEDs in display device, then the scanning process is simple and compatible with existing scan ICs, but flicker phenomenon occurs causing visual discomfort to users
Solution Approach 1:
The patent applies periodic action by dividing the scanning process into multiple frames, where odd lines are scanned in one frame and even lines are scanned in the next frame. This periodic alternation between different line groups creates a non-sequential scanning pattern that reduces flicker while maintaining compatibility with existing scan ICs designed for sequential operation.
Solution Approach 2:
The patent segments the display lines into two separate groups: odd lines and even lines. By scanning these segments alternately in different frames rather than sequentially scanning all lines in order, the patent reduces flicker perception while keeping the scanning mechanism compatible with existing hardware.
2Object-affected harmful factors
If non-sequential scanning is implemented to reduce flicker, then flicker phenomenon is reduced improving image quality, but additional control signals with multiple clock intervals are required increasing system complexity
Solution Approach 1:
The patent employs dynamic clock signal generation where the clock interval varies based on the line number being scanned. The controller dynamically adjusts the clock signal characteristics - using first clock intervals for odd lines and second clock intervals for even lines - enabling non-sequential scanning without requiring fundamentally different hardware architecture.
Solution Approach 2:
The patent changes the temporal parameters of the control signal by introducing multiple clock intervals with different frequencies. The first clock interval uses a first frequency for scanning odd lines, while the second clock interval uses a second frequency for scanning even lines. This parameter variation enables flicker reduction while maintaining compatibility with existing scan ICs.
3Object-affected harmful factors
If alternating clock intervals with different frequencies are applied to scan IC, then scanning order is improved reducing flicker, but the scan IC must process variable frequency signals increasing processing complexity
Solution Approach 1:
The patent makes the scan IC multi-functional by designing it to handle both sequential and non-sequential scanning modes. The scan IC processes control signals with varying clock intervals by interpreting the sequence signals from the controller, allowing it to adapt its scanning behavior based on the input signal pattern without requiring dedicated hardware for each mode.
Solution Approach 2:
The patent introduces a sequence signal as an intermediary between the controller and the scan IC. This sequence signal carries information about the desired scanning order, enabling the scan IC to adjust its operation based on the controller's instructions without requiring complex internal logic for frequency detection and adaptation.
Data Source
AI summary
A display device including a display including a plurality of light emitting devices (LEDs) arranged in a plurality of lines; a scan integrated circuit (IC) configured to scan the plurality of lines in which the plurality of LEDs are arranged; and a controller is configured to apply, to the scan IC, a control signal including a plurality of clock intervals having different frequencies, wherein, based on the control signal received from the controller, the scan IC non-sequentially scans the plurality of lines.