Light Emitting Device Control Circuit Time Division Drive
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Solution Overview
Problem
Existing light emitting device control circuits face challenges in reducing energy consumption and preventing noise caused by simultaneous on/off switching of light emitting devices, as they lack effective methods to shift ON-OFF timings and manage current concentration.
Innovation Solution
A light emitting device control circuit device that employs multiple drive control lines and pulse voltage supplying lines to drive light emitting devices with a predetermined delay, ensuring time division drive and preventing simultaneous current concentration, thereby reducing energy consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting devices are driven simultaneously, then the illumination intensity is improved, but the current consumption concentration increases causing noise
Solution Approach 1:
The patent applies periodic action by driving light emitting devices in sequential time divisions rather than simultaneously. The drive control lines activate different groups of light emitting devices at different time intervals, creating a periodic driving pattern that distributes current consumption over time, thereby reducing noise while maintaining overall illumination intensity.
2Object-generated harmful factors
If light emitting devices are driven in time-division manner, then the noise is reduced, but the illumination intensity decreases
Solution Approach 1:
The patent merges multiple drive control lines to simultaneously control multiple groups of light emitting devices. By combining the output of several drive control lines that operate in time-division manner, the system achieves both noise reduction through sequential driving and maintains illumination intensity by having multiple groups of light emitting devices active at different times.
3Use of energy by moving object
If pulse voltage is supplied to multiple light emitting devices, then the energy consumption is improved, but the current concentration at switching timing increases causing noise
Solution Approach 1:
The patent segments the pulse voltage supply by dividing it into multiple time-division intervals through separate drive control lines. Each drive control line receives pulse voltage at different time intervals, which segments the current consumption concentration into smaller, distributed peaks rather than a single large peak, thereby reducing noise while maintaining energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively shifts ON-OFF timings of light emitting devices in a matrix pattern, preventing current concentration and noise, while optimizing energy usage by supplying voltage only during necessary periods.
Implementation Method 1
a semiconductor device well known as a light emitting device or a display device, a light emitting diode (LED) or an organic light emitting diode (OLED), and a laser diode (LD) are known
Data Source
AI summary
The light emitting device control circuit device 100 in accordance with the disclosure includes a power source V1, a transistor TR1, a light emitting unit EU1, switches S1 to S17, constant current sources CC1 to CC17, and a controller 110. A switching voltage Vs1 is supplied from the controller 110 to turn ON or turn OFF the transistor TR intermittently, a pulse voltage is supplied to a pulse voltage supplying line Y1 connected to a drain terminal D of the transistor TR1. The driving signals SP1 to SP17 are sequentially supplied to the switches S1 to S17 to turn ON or turn OFF them (i.e., time division drive). The light emitting devices A1 to A17 are driven sequentially by a pulse current (i.e., time division drive) when a high voltage is supplied to the pulse voltage supplying line Y1 and when the driving signals SP1 to SP17 are turned ON.