摘要:
The techniques of the present invention relate to automatically controlling display intensity. The present invention includes a calibration step in which the display intensity settings are correlated to the ambient light intensity conditions. The present invention also includes an automatic adjustment step in which the ambient light intensity is measured and the display intensity is automatically adjusted according to a correlation defined in the calibration step.
摘要:
The present invention provides a controller for controlling strings of LEDs in a liquid crystal display. The hybrid controller uses both analog and digital circuit components. Error amplifiers are used to compare analog feedback signals received from the LED strings with reference signals. The results of those comparisons are converted to digital data and processed by a digital signal processor (DSP). The DSP calculates the drive voltages for the LED strings based on the deviation between the actual current flows (represented by feedback signals) and the desired current flows (represented by reference signals) through the LED strings. Analog drivers provide the drive voltages to the LED strings.
摘要:
The techniques of the present invention relate to automatically controlling display intensity. The present invention includes a calibration step in which the display intensity settings are correlated to the ambient light intensity conditions. The present invention also includes an automatic adjustment step in which the ambient light intensity is measured and the display intensity is automatically adjusted according to a correlation defined in the calibration step.
摘要:
The present invention relates to displays that use LED strings for backlighting. A lead string is provided with continuous drive voltage and the non-lead strings are provided with pulsed drive pulses. The string having the highest forward voltage is selected as the lead string. Feedback information indicative of the currents flowing through the non-lead strings is used to determine the duty cycles of the voltage pulses provided to drive the non-lead strings. The non-lead strings are controlled using pulsed drive voltages to minimize power dissipation in the circuit.
摘要:
The present invention provides a controller for regulating current in LEDs in electronic displays. The controller uses temperature sensing diodes to detect changes in the LED ambient temperature. As the LED ambient temperature changes, the forward voltage of the temperature sensing diode decreases. A signal processor adjusts the current passing through the LEDs based on the temperature induced changes in the forward voltage of the temperature sensing diodes. The present invention can reduce costs over the present methods of regulating current in LEDs and may more easily be integrated into a single integrated circuit chip. The temperature sensing may also be implemented outside the integrated circuit chip.
摘要:
The present invention provides a controller for controlling strings of LEDs in a liquid crystal display. The hybrid controller uses both analog and digital circuit components. Error amplifiers are used to compare analog feedback signals received from the LED strings with reference signals. The results of those comparisons are converted to digital data and processed by a digital signal processor (DSP). The DSP calculates the drive voltages for the LED strings based on the deviation between the actual current flows (represented by feedback signals) and the desired current flows (represented by reference signals) through the LED strings. Analog drivers provide the drive voltages to the LED strings.
摘要:
The present invention relates to circuits and methods for limiting the operating area of a transistor in a constant current source. The circuits and methods use a detector and a driver to limit the operating area of a transistor. The detector and driver have parameters selected so that, when the voltage at the drain of the transistor satisfies a reference condition, the driver causes drain current of the transistor to decrease. The reference condition is determined relative to the maximum safe drain-to-source voltage at the design drain current of the constant current source.
摘要:
The present invention involves an electrical system in which an analog signal channel passes through various integrated circuit chips (ICs). The channel can carry one or more analog signals. Each IC can modify the signal(s) passing through it and pass it on to another IC or system component. The channel can be programmable. Each IC can include a comparator or a multiplexor to receive the channel signal from another IC or system component and to modify the received signal before transmitting it to another IC or system component. The comparator or the multiplexor can be programmable and can be selectively configured to compare the incoming signal from the channel with a variety of other signals and thresholds, or to simply act as a flow through gate and allow the signal to pass without any modification. The comparison can determine the output of the comparator. The operation and programming of the comparators, the multiplexors and the channel can be centrally controlled by a system controller, can be independently controlled by the ICs, or a combination thereof.
摘要:
The present invention relates to circuits and methods for limiting the operating area of a transistor in a constant current source. The circuits and methods use a detector and a driver to limit the operating area of a transistor. The detector and driver have parameters selected so that, when the voltage at the drain of the transistor satisfies a reference condition, the driver causes drain current of the transistor to decrease. The reference condition is determined relative to the maximum safe drain-to-source voltage at the design drain current of the constant current source.
摘要:
System(s) and method(s) are provide to efficiently assess performance of a set of light emitting diode (LED) strings in an illumination system. A multiplexer component collects input signal from the one or more LED strings via a first set of one or more monitoring pins, processes the collected input signal, and extracts at least one output signal. The at least one output signal is conveyed to a demultiplexer component through a second set of one or more monitoring pins, wherein the number of elements in the second set of monitoring pins is equal to or smaller than the number of monitoring pins in the first set. The collected input signal is processed in accordance with at least one mode of operation of the multiplexer component, the mode of operation autonomously configured by the demultiplexer component. The multiplexer component can autonomously generate intelligence on operating status of the set of LED strings.