LED Backlight Driver Non-Overlap Signal Timing
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Solution Overview
Problem
Current methods for driving LED backlight units in display devices face challenges in efficiently managing gate and source signals, leading to increased power consumption and performance issues due to overlapping signal timings and rapid response times of LED elements.
Innovation Solution
A method is introduced that includes generating non-overlap intervals for gate signals and high-impedance intervals for source signals, allowing these signals to operate organically, with the timing of the high-impedance interval determined in conjunction with the non-overlap interval, to prevent malfunctions and reduce peak power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gate signals and source signals are generated with overlapping timings to improve response speed, then the response time is reduced, but power consumption increases due to simultaneous signal activation
Solution Approach 1:
The patent implements non-overlap intervals in gate signals and high-impedance intervals in source signals, creating a periodic timing pattern where signals are activated sequentially rather than simultaneously. This periodic action reduces peak power consumption while maintaining adequate response time for LED backlight operation.
Solution Approach 2:
The patent applies preliminary action by deactivating gate signals before activating source signals during the non-overlap interval. This sequencing prevents simultaneous signal conflict and reduces peak power consumption while ensuring the LED elements receive proper driving currents in a controlled temporal sequence.
2Productivity
If gate signals are activated simultaneously to improve productivity, then the driving efficiency is improved, but malfunctions occur due to signal interference
Solution Approach 1:
The patent segments the signal activation process by dividing gate signals into separate non-overlapping time intervals for different LED element groups. This segmentation prevents signal interference and malfunctions while maintaining overall driving efficiency through coordinated sequential activation.
Solution Approach 2:
The patent employs periodic action by implementing regular non-overlap intervals between gate signal activations. This periodic timing pattern ensures stable signal operation without interference, improving reliability while maintaining productivity through systematic sequential driving of LED elements.
3Manufacturing precision
If multiple driver chips are used to control LED elements to improve manufacturing precision, then the control accuracy is improved, but manufacturing costs increase
Solution Approach 1:
The patent applies universality by designing a single driver chip that can control multiple LED element groups through the non-overlap interval mechanism. This multi-functional approach provides accurate control comparable to multiple separate driver chips while reducing manufacturing costs by consolidating control functionality into one chip.
Data Source
AI summary
A method of driving a light emitting diode (LED) backlight unit, which includes a plurality of LED elements that are connected to a plurality of gate lines and a plurality of source lines, includes generating a plurality of gate signals applied to the plurality of gate lines. While the plurality of gate signals are generated, a non-overlap interval between activation intervals of two adjacent gate signals is generated. All of the plurality of gate signals are deactivated during the non-overlap interval. A plurality of source signals applied to the plurality of source lines are generated. While the plurality of source signals are generated, a high-impedance (Hi-Z) interval included in the non-overlap interval is generated. At least some of the plurality of source signals have a high-impedance state during the high-impedance interval.