Backlight Control Circuit Analog Signal Conversion
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Solution Overview
Problem
Existing display technologies require digital circuit logic operations on the motherboard to convert light-sensing signals into backlight control signals, leading to high costs and power consumption.
Innovation Solution
A backlight control circuit with a luminous flux sensing sub-circuit and a control sub-circuit that directly converts light-sensing signals into backlight control signals without digital circuit devices, using transistors and operational amplifiers to adjust backlight brightness based on ambient luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital circuit devices are used to convert light-sensing signals into backlight control signals, then the control precision is improved, but the cost and power consumption increase
Solution Approach 1:
The patent replaces digital circuit devices with an analog control circuit that directly converts light-sensing signals into backlight control signals. The analog circuit includes operational amplifiers and transistors that process signals in continuous form rather than digital form, eliminating the need for ADC/DAC conversions and digital logic operations, thereby reducing power consumption while maintaining control precision
Solution Approach 2:
The patent extracts and removes the digital circuit devices from the backlight control system. By taking out the ADC, digital processor, and DAC components, the system achieves lower power consumption while the essential signal conversion function is retained through the analog circuit path
2Measurement precision
If digital circuit devices are used to convert light-sensing signals into backlight control signals, then the control precision is improved, but the cost increases
Solution Approach 1:
The patent substitutes expensive digital circuit devices with simpler analog circuit components. The analog control circuit uses operational amplifiers and transistors that are generally less costly than digital signal processors and ADC/DAC converters, while still achieving the required control precision for backlight adjustment
Solution Approach 2:
The patent employs cost-effective analog components that can be easily manufactured and replaced. The analog circuit design uses standard operational amplifiers and transistors that are inexpensive and widely available, reducing the overall bill of materials cost compared to digital circuit implementations
3Use of energy by moving object
If analog control circuit is used to directly convert light-sensing signals into backlight control signals, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the signal conversion and control functions into a single integrated analog control circuit. By combining the transimpedance amplifier, voltage amplifier, and backlight control output in one continuous analog signal path, the design eliminates multiple separate digital processing stages, thereby reducing overall system complexity despite using analog components
4Ease of manufacture
If analog control circuit is used to directly convert light-sensing signals into backlight control signals, then the cost is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent designs the analog control circuit with carefully selected component parameters to ensure stable operation. By optimizing the feedback resistor values, capacitor values, and transistor biasing conditions, the circuit achieves robust performance that is tolerant of normal manufacturing variations, reducing the stringency of precision requirements while maintaining control accuracy
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
This solution reduces costs and power consumption by eliminating the need for digital circuit devices and directly controlling backlight brightness based on ambient light, improving user experience by providing a more efficient and cost-effective display solution.
Implementation Method 1
a luminous flux sensing sub-circuit and a control sub-circuit: the luminous flux sensing sub-circuit is configured to sense luminous flux received by the display device in an environment thereof, obtain a first control signal related to the luminous flux
Data Source
AI summary
In the backlight control circuit; a luminous flux sensing sub-circuit senses luminous flux of a display device, obtains and outputs a first control signal from a first control signal output terminal; a control sub-circuit includes N control units each including a first/second sub-unit; the first sub-unit connects or disconnects an output terminal of the second sub-unit and the backlight control signal output terminal under the control of the first control signal, the second sub-unit connects or disconnects a signal input terminal and the output terminal of the second sub-unit under the control of the second control signal; the N second control signal output terminals provide effective second control signals in a time division manner; conduction thresholds corresponding to the N first sub-units increase sequentially, and when a corresponding relationship between the first control signal and the conduction threshold is met, the first transistor is turned on.