摘要:
An exemplary gamma voltage output circuit (2) for a liquid crystal display device, which includes a resistor string, and a constant current source (21) providing a current to the resistor string. The resistor string has a plurality of resistor units R21˜R2(n+3), each of nodes between two corresponding adjacent resistors being defined as an output terminal for outputting a gamma voltage.
摘要:
A power circuit includes a PWM circuit for generating a pulse wave, a first control signal and a second control signal, a switching mode voltage stabilizer circuit, a first control circuit and a second control circuit. The PWM circuit includes a pulse wave pin, a first control pin and a second control pin. The switching mode voltage stabilizer circuit receives the pulse wave via the pulse wave output pin, and converts an external input voltage into a first direct voltage under control of the pulse wave. The first control circuit receives the first control signal via the first control pin. The second control circuit receives the second control signal via the second control pin and the first direct voltage, and converts the first direct voltage into a second direct voltage.
摘要:
An exemplary negative voltage generating circuit includes a voltage input, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a first capacitor, a second capacitor, a switch controller, and a voltage output. The voltage input is connected to ground via the first switch transistor, the first capacitor, and a source electrode and the second switch transistor. The first switch transistor is connected to the second switch transistor via the third switch transistor, the second capacitor, and the fourth switch transistor. The third switch transistor is connected to ground. The fourth switch transistor is connected to the voltage output. The first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor are connected to the switch controller.
摘要:
An exemplary driving system (100) of an LCD includes a control circuit (10) and a driving circuit (11). The control circuit includes a decoder circuit (13), a DC-DC converter (130), and a timing control circuit (14). The driving circuit includes a gate driver circuit (15), a source driver circuit (16), a pulse width modulation circuit (150), and a gamma circuit (160). The DC-DC converter is packaged in the decoder circuit. The pulse width modulation circuit is packaged in the gate driver circuit. The gamma circuit is packaged in the source driver circuit.
摘要:
A power circuit includes a PWM circuit for generating a pulse wave, a first control signal and a second control signal, a switching mode voltage stabilizer circuit, a first control circuit and a second control circuit. The PWM circuit includes a pulse wave pin, a first control pin and a second control pin. The switching mode voltage stabilizer circuit receives the pulse wave via the pulse wave output pin, and converts an external input voltage into a first direct voltage under control of the pulse wave. The first control circuit receives the first control signal via the first control pin. The second control circuit receives the second control signal via the second control pin and the first direct voltage, and converts the first direct voltage into a second direct voltage.
摘要:
An exemplary digital picture display includes a display panel (220), a supporting element (240), and a control section. The display panel is arranged for displaying digital pictures. The supporting element is arranged for supporting the display panel. The control section is arranged for rotating and scaling a digital picture to match with a resolution of the display panel, and rotating the display panel.
摘要:
An exemplary digital disc player includes a main control unit (21), a central processing unit (28) and a detecting circuit (24). The central processing unit includes a controller (282) and a first storage unit (283). The detecting circuit is configured for detecting a variation of a voltage of the main control unit and the central processing unit. When the power of the digital disc player is cut off, the detecting circuit generates a temporary direct voltage, the first storage storing track information of a digital disc. When the power of the digital disc player is turned on again, the main control unit addresses the track information from the first storage unit according to a control signal from the controller.