USB Input Device White LED Luminous Intensity
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Solution Overview
Problem
Conventional input devices with luminous functions, such as keyboards and mice, have insufficient luminous intensity and limited flexibility in adjusting light color, particularly for achieving white balance, due to restricted current distribution through USB interfaces like USB2.0, which limits their application and entertainment value.
Innovation Solution
Incorporating a white LED unit and adjusting driving currents for red, green, and blue LED units independently, allowing for higher luminous intensity and improved chromaticity coordinate modulation, enabling more flexible and efficient light output, including white balance, without the need for averaging currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the operating current is averaged and split into three driving currents for red, green and blue LED units, then the USB interface can power all three LED units, but the luminous intensity of each individual LED unit becomes insufficient
Solution Approach 1:
The patent extracts the white LED unit from the traditional RGB three-color mixing system. By using a white LED as the primary light source, the system no longer needs to average-split the current among three color channels to achieve white light, thereby resolving the luminous intensity limitation while maintaining color adjustment flexibility through the remaining RGB units
Solution Approach 2:
The patent segments the lighting function into two independent parts: a white LED unit for providing base luminous intensity and a RGB LED unit for color adjustment. This segmentation allows the white LED to operate at full current for maximum brightness while the RGB units independently control chromaticity, eliminating the trade-off between intensity and flexibility
2Power
If the USB2.0 interface is used to power the input device, then the device can be powered with standard USB connectivity, but the maximum operating current is limited to 500 mA which restricts luminous output
Solution Approach 1:
By extracting the white LED unit from the RGB system, the patent allows the majority of the 500 mA current to be allocated to the white LED for high luminous intensity, while only a small portion of current is needed for the RGB units to achieve precise color control, thereby maximizing power utilization within USB2.0 constraints
Solution Approach 2:
The patent changes the fundamental parameter of light generation from three-color mixing to white LED emission with RGB color adjustment. This parameter change enables the system to achieve high luminous intensity at lower current consumption, making it compatible with USB2.0's 500 mA limit while maintaining or enhancing lighting performance
3Adaptability or versatility
If three separate LED units with individual driving currents are used, then color mixing can be achieved, but the current distribution becomes complex and requires extensive calibration for white balance
Solution Approach 1:
The patent removes the need for complex three-color current balancing by extracting the white LED unit. The driving circuit now only needs to control the white LED current for intensity and the RGB unit currents for chromaticity adjustment, significantly simplifying the control algorithm and reducing calibration requirements for achieving white balance
Solution Approach 2:
The white LED unit acts as an intermediary that provides a stable white light foundation. This intermediary simplifies the color control system because the driving circuit can independently adjust the RGB currents for chromaticity without needing to constantly balance three color channels, reducing the overall system complexity
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 significantly enhances luminous intensity, particularly for white light, and increases flexibility in color adjustment, resulting in brighter and more adjustable light outputs, with luminous intensity being at least 1.5 to 3 times that of conventional devices, and allowing for precise white balance without extensive calibration.
Implementation Method 1
a white light-emitting diode unit (32), a red light-emitting diode unit (33), a green light-emitting diode unit (34), and a blue light-emitting diode unit (35
Implementation Method 2
The white light-emitting diode unit emits a white light beam in response to the first driving current
Implementation Method 3
a red light-emitting diode unit (33), a green light-emitting diode unit (34), and a blue light-emitting diode unit (35
Implementation Method 4
The red light-emitting diode unit emits a red light beam in response to the second driving current
Implementation Method 5
At least one of the red light beam, the green light beam and the blue light beam is mixed with the white light beam
Data Source
AI summary
An input device includes a universal serial bus interface, a white light-emitting diode unit, a red light-emitting diode unit, a green light-emitting diode unit, a blue light-emitting diode unit and a driving part. The driving part receives electricity through the universal serial bus and drives at least one of the white light-emitting diode unit, the red light-emitting diode unit, the green light-emitting diode unit and the blue light-emitting diode unit to emit a light beam. Consequently, the light beam with a higher luminous intensity and a specified color is outputted from the input device.