Dynamic LED Scan Order for First Line Dim
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Solution Overview
Problem
LED display devices experience a 'first line dim' issue, where the time taken for the first scan line to emit light is longer than the other lines, leading to a loss of light emission time and a darkened area on the screen due to continuous power supply to the same line.
Innovation Solution
A display device and method that change the turn-on order of LED lines within each sub-period of a scan period, ensuring power is supplied to a different line than the previous one, either randomly or by dividing lines into regions, to prevent continuous power accumulation on a single line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a scan driving method is used to successively drive LED lines in top-bottom order, then the driving control is simplified, but the first scan line experiences longer time to emit light causing first line dim and light emission time loss
Solution Approach 1:
The patent applies dynamics by making the scan starting line changeable rather than fixed. The processor dynamically selects which LED line starts the scan sequence in each frame, preventing any single line from consistently experiencing the initial delay. This resolves the contradiction by maintaining simple sequential scanning while eliminating the persistent time loss on the first line through dynamic repositioning of the scan start point.
Solution Approach 2:
This principle is not applicable to this patent as it deals with electrical scanning control rather than fluid or gas systems.
2Stability of the object's composition
If power is continuously supplied to the same LED line in sequential scan order, then the scanning sequence is maintained, but driving loss accumulates on specific lines causing screen darkening
Solution Approach 1:
The patent makes the scan starting position dynamic rather than static. By changing the starting line in each frame, the system prevents driving loss from accumulating on any single LED line while preserving the sequential scanning mechanism. This dynamic adjustment redistributes the driving load evenly across all lines, resolving the energy loss accumulation problem.
Solution Approach 2:
The patent implements periodic action by cyclically changing the scan starting line position. The processor systematically rotates which line begins the scan sequence, ensuring that each line periodically experiences both early and late positions in the scan order. This periodic redistribution prevents permanent driving loss accumulation on any specific line while maintaining stable overall scanning operation.
3Device complexity
If the scan starting line is fixed in sequential order, then the hardware control is simplified, but the first line always experiences delayed light emission
Solution Approach 1:
The patent introduces dynamic control of the scan starting line through software processing rather than hardware redesign. The processor dynamically selects the starting line in each frame, which eliminates the first line dim issue without increasing hardware complexity. This software-based dynamic adjustment resolves the brightness problem while keeping the hardware control simple.
Solution Approach 2:
The patent changes the parameter of scan starting line position from a fixed value to a variable that changes each frame. By modifying which line index serves as the starting point, the system improves first line brightness (since different lines take turns being first) without complicating the hardware. This parameter change approach resolves the contradiction between simplicity and performance.
Data Source
AI summary
A display device includes a display including a plurality of LED lines, a scan driver for successively supplying a power to the plurality of LED lines, and a processor for controlling the scan driver to successively supply the power to the plurality of LED lines in a repeated manner for each of a plurality of sub-periods that form a scan period and changing a turn-on order of the plurality of LED lines for each of the plurality of sub-periods.