Qisda Corporation

Qisda Optronics (suzhou) Co., Ltd.

Fang-Chieh Lu

Chi-Jen Chen

Chuan-Chu Chen

Chun-Hsiao Lin

Ching-Ying Tsou

Po-Fu Wu

Ying-Fang Lin

Hsien-Tsung Chiu

Fu-Shiung Shih

Chun-Jung Hu

A projector and a drive circuit thereof are provided. The projector includes a light source and a drive circuit. The light source includes at least one red light diode, at least one green light diode, at least one first blue light diode and at least one second blue light diode. The drive circuit includes a red light drive circuit, a green light drive circuit, a first blue light drive circuit and a second blue light drive circuit. The green light drive circuit outputs a green light drive signal to the green light diode according to a green light control signal. The second blue light drive circuit outputs a second blue light drive signal to the second blue light diode according to a second blue light control signal. The second blue light control signal and the green light drive signal have synchronous pulse.

Light emitting diode projector and drive circuit thereof

A driver circuit includes a first voltage conversion unit, a second voltage conversion unit, a third voltage conversion unit, a light driver and a control circuit. The first voltage conversion unit may convert a first voltage to a second voltage. The second voltage conversion unit may convert the second voltage to a third voltage in a non-electrically isolated manner. The third voltage conversion unit may convert the second voltage to a fourth voltage in a non-electrically isolated manner. The light driver may receive the third voltage and a control signal to generate a control current according to the control signal. The control circuit may receive the fourth voltage and an image signal to generate the control signal according to the image signal.

Driver circuit and projector including voltage conversion units at primary side

A power control circuit for a projector for controlling a light source of the projector. The power control circuit includes: a detector for detecting an AC input voltage is a first value or a second value; a switch coupled to the detector, conducting or disconnecting of the switch being based on the detector detecting whether the AC input voltage is the first value or the second value, the switch further outputting a first control signal; and a laser driver coupled to the switch and the light source, in response the first control signal from the switch to change power consumption of the light source. When the AC input voltage is the first value, power consumption of the light source is a default value. When the AC input voltage is the second value, power consumption of the light source decreased from the default value.

Projector, power control circuit and method for the same

A driver circuit includes a first voltage converter, a light source driver, a second voltage converter and a control circuit. The first voltage converter converts a first voltage to a second voltage. The light source driver is coupled to the first voltage converter, converts the second voltage to a third voltage and outputs the third voltage to a light source for providing light. The second voltage converter is coupled to the first voltage converter, converts the second voltage to a fourth voltage and outputs the fourth voltage. The control circuit is coupled to the second voltage converter to receive the fourth voltage and outputs a first control signal to control the light source driver for controlling the light source. The first voltage is lower than the second voltage, the second voltage is higher than the third voltage, and the second voltage is higher than the fourth voltage.

Driver circuit having light source driver at primary side

A power board and ballast module includes a housing, a power board, a ballast and an electrical connector. The power board is disposed in the housing. The ballast is disposed in the housing and electrically connected to the power board. The electrical connector is disposed in the housing and exposed out of the housing, wherein the power board and the ballast are electrically connected to the electrical connector respectively. Projectors using the power board and ballast module are also provided.

Power board and ballast module and projector using the same

An electronic device includes a first light module, a second light module, a primary driver, and a first secondary driver. The first light module is used to emit a first light, and the second light module is used to emit a second light. The primary driver has a first control terminal for turning on the first light module during a first duration, and a second control terminal for turning on the second light module during a second duration. The first secondary driver is used to turn on the first light module during the second duration.

Method for operating an electronic device to increase light density and electronic device thereof

A projector includes an apparatus casing, a light source module, a flow generating device, a sensing module, and a power module. The light source module is disposed inside the apparatus casing and includes a light-emitting part and a lampshade surrounding the light-emitting part. The flow generating device can generate an air flow for dissipating heat by the light source module. The sensing module is disposed in the apparatus casing and includes a thermo-sensitive component disposed near the lampshade and located in a flowing path of the air flow. The power module is disposed in the apparatus casing and electrically connected to the light source module and the sensing module. The power module selectively stops powering the light source module according to an electric parameter of the thermo-sensitive component. Thereby, the invention protects the projector from being overheated by use of the thermo-sensitivity of the thermo-sensitive component.

Growing community of inventors

Taipei, Taiwan

Fang-Chieh Lu