摘要:
There are provided embodiments for enhancing the quality of an ultrasound spatial compound image based on a beam profile in an ultrasound system. In one embodiment, an ultrasound system comprises: an ultrasound data acquisition unit configured to acquire ultrasound data for obtaining a plurality of ultrasound images corresponding to a plurality of steering angles; a storage unit for storing at least one beam profile indicating a spreading degree of an ultrasound beam according to depth based on at least one focusing point; and a processing unit configured to set an amount of blurring corresponding to spreading of the ultrasound beam according to the depth based on the at least one beam profile, and perform a filtering process for compensating the blurring by the spreading of the ultrasound beam based on the ultrasound data and the amount of blurring to form an ultrasound spatial compound image.
摘要:
Disclosed is a liquid crystal display device having a lamp driving apparatus for preventing lamps from being damaged due to electric current variation among the lamps. A DC/DC converter converts an externally provided DC voltage input into a converted DC voltage signal having a predetermined voltage level. A DC/AC inverter inverts the converted DC voltage signal into an AC voltage signal to supply the inverted AC voltage signal to an input terminal of a lamp. A power controller detects electric current flowing the lamp at an output terminal of the lamp to control the level of the inverted AC voltage signal output from the DC/AC inverter and bypasses a part of electric current applied to the input terminal of the lamp when a level of the detected electric current is higher than a predetermined threshold value. Therefore, when the level of the electric current flowing through the lamp exceeds the predetermined threshold value, the power controller bypasses the part of the electric current supplied to the lamp to the ground, thereby decreasing the amount of the electric current supplied to the lamp and preventing the lamp from being damaged.
摘要翻译:公开了一种具有灯驱动装置的液晶显示装置,用于防止灯由于灯之间的电流变化而被损坏。 DC / DC转换器将外部提供的DC电压输入转换成具有预定电压电平的转换的DC电压信号。 DC / AC逆变器将转换的直流电压信号反相为交流电压信号,将反相交流电压信号提供给灯的输入端。 功率控制器检测在灯的输出端流动灯的电流,以控制从DC / AC逆变器输出的反相AC电压信号的电平,并绕过施加到灯的输入端的电流的一部分,当a 检测电流的电平高于预定阈值。 因此,当流过灯的电流水平超过预定阈值时,功率控制器将提供给灯的电流的一部分旁路到地,从而减少供应给灯的电流量, 防止灯被损坏。
摘要:
There are provided embodiments for enhancing the quality of an ultrasound image are disclosed. In one embodiment, by way of non-limiting example, an ultrasound system comprises: an ultrasound data acquisition unit configured to acquire ultrasound data corresponding to at least one ultrasound image; a storage unit for storing at least one beam profile indicating a spreading degree of an ultrasound beam according to depth based on at least one focusing point; and a processing unit configured to set an amount of blurring corresponding to spreading of the ultrasound beam according to the depth based on the at least one beam profile, and perform a filtering process for compensating the blurring by the spreading of the ultrasound beam based on the ultrasound data and the amount of blurring to enhance quality of the at least one ultrasound image.
摘要:
A brightness adjusting device includes a multiplication circuit, which multiplies a vertical signal by a predetermined multiplication ratio to output a multiplication signal, a differential circuit that distinguishes between different multiplication signals, a serrated wave generator that charges/discharges a condenser according to a signal output from the differential circuit and generates a serrated wave having constant amplitude independently of a frequency of the multiplication signal, a brightness adjusting voltage generator that generates a reference voltage to determine a pulse duty, and a comparator that outputs a pulse signal by comparing a voltage of the serrated wave with the brightness adjusting voltage. The brightness adjusting voltage generator includes a circuit that outputs a variable voltage, and the multiplication circuit includes a circuit having a variable multiplication ratio.
摘要:
A light source unit which can minimize current differences between a plurality of light emitting diodes (“LEDs”) includes a printed circuit board (“PCB”) which includes an active region that emits light and an inactive region that accounts for a remainder of the PCB, an LED array which includes a plurality of LEDs that are arranged at regular intervals, and a current balancing circuit which is disposed in the inactive region, generates a plurality of current balancing voltages by uniformly adjusting current differences between the LEDs, and outputs the current balancing voltages. A liquid crystal display (“LCD”) including the light source unit, and a method of minimizing current differences between a plurality of LEDs are further provided.
摘要:
According to one or more embodiments, an inverter provides a light source with an input voltage. A protection circuit shuts down the inverter based on an overvoltage protection level that is detected based on the input voltage. A protection circuit control part shuts down the operation of the protection circuit during a predetermined interval. Abnormal operation of the protection circuit caused by a high voltage provided when the light source is turned on may be prevented. Therefore, a turn-on defect of the light source may be prevented.
摘要:
A display apparatus includes a display panel and a backlight assembly including a lamp and an inverter. The inverter includes a main transformer, a main driver and a voltage controller. The main transformer applies a driving alternating current (AC) voltage to the lamp. The main driver generates an output signal controlling the main transformer based on a feedback signal from the main transformer. The voltage controller is electrically connected to a feedback terminal of the main driver to control a maximum level of a voltage applied to the feedback terminal.
摘要:
A brightness adjusting device includes a multiplication circuit, which multiplies a vertical signal by a predetermined multiplication ratio to output a multiplication signal, a differential circuit that distinguishes between different multiplication signals, a serrated wave generator that charges/discharges a condenser according to a signal output from the differential circuit and generates a serrated wave having constant amplitude independently of a frequency of the multiplication signal, a brightness adjusting voltage generator that generates a reference voltage to determine a pulse duty, and a comparator that outputs a pulse signal by comparing a voltage of the serrated wave with the brightness adjusting voltage. The brightness adjusting voltage generator includes a circuit that outputs a variable voltage, and the multiplication circuit includes a circuit having a variable multiplication ratio.
摘要:
A method of providing an ultrasound image includes: obtaining an ultrasound image of an object; detecting a plurality of layers having different sound speeds based on the ultrasound image; and displaying information about boundaries of the plurality of layers.
摘要:
A light unit includes: an integrated power (“IP”) board which receives power supply and converts the power supply into a high voltage and a supply voltage; a lamp; and a terminal board (“T board”) which receives the high voltage from the IP board to turn on the lamp, receives the supply voltage from the IP board to transfer the supply voltage to the IP board, in which the IP board transfers the high voltage to the T board after the IP board receives the supply voltage from the T board.