1. Field of the Invention
The present invention relates to liquid crystal display (LCD) driving, and more particularly, to a driving device for driving an LCD monitor.
2. Description of the Prior Art
The advantages of the liquid crystal display (LCD) include lighter weight, less electrical consumption, and less radiation contamination. Thus, the LCD has been widely applied to portable information products such as notebooks, and Personal Digital Assistants (PDAs). In addition, LCD panels have gradually replaced cathode ray tubes (CRTs) in monitor applications of desktop computers.
Light rays from a backlight module within an LCD monitor are typically polarized by a first polarizer and then converted into light rays of different polarization directions by utilizing various arrangements of liquid crystal molecules within an LCD panel controlled by certain driving voltages provided by a driving device within the LCD monitor. Color filters and a second polarizer are applied, in order to generate red, blue, and green lights with different intensities of gray levels. As the increased number of gray levels is typically a characteristic of an advanced LCD monitor with respect to others, more accurate driving voltages are required, where uniformity control by averaging driving voltages to be utilized for the same gray level is a typical method for controlling the accuracy of the driving voltages. Please refer to US Patent Application Publication No. US 2003/0234757 and U.S. Pat. No. 6,366,065 for more information.
It is an objective of the claimed invention to provide driving devices for driving liquid crystal display (LCD) monitors.
According to one embodiment of the claimed invention, a driving device for driving an LCD monitor is disclosed. The LCD monitor comprises an LCD panel for displaying a plurality of pixels arranged in a matrix format. The driving device comprises: a power supply comprising a plurality of power transmission lines for carrying a plurality of voltages; and a plurality of driving units capable of driving the LCD panel according to the voltages carried by the power transmission lines. Each driving unit comprises: an output buffer having a first input terminal and an output terminal connected to each other, where the output terminal of the output buffer is connected to an output terminal of the driving unit; a first switch coupled to a power source for selectively transmitting the power provided by the power source to turn on the output buffer; and a second switch coupled between the output terminal of the driving unit and a second input terminal of the output buffer.
According to one embodiment of the claimed invention, a driving device for driving an LCD monitor is disclosed. The LCD monitor comprises an LCD panel for displaying a plurality of pixels arranged in a matrix format. The driving device comprises: a power supply comprising a plurality of power transmission lines for carrying a plurality of voltages; and a plurality of driving units capable of driving the LCD panel according to the voltages carried by the power transmission lines. Each driving unit comprises: an output buffer having a first input terminal coupled to one of the power transmission lines, where an output terminal of the output buffer is connected to an output terminal of the driving unit; a first switch coupled to a power source for selectively transmitting the power provided by the power source to turn on the output buffer; and a second switch coupled between the first input terminal and a second input terminal of the output buffer.
According to one embodiment of the claimed invention, a driving device for driving an LCD monitor is disclosed. The LCD monitor comprises an LCD panel for displaying a plurality of pixels arranged in a matrix format. The driving device comprises: a power supply comprising a plurality of power transmission lines for carrying a plurality of voltages; and a plurality of driving units capable of driving the LCD panel according to the voltages carried by the power transmission lines. Each driving unit comprises: an output buffer having a first input terminal coupled to one of the power transmission lines, where an output terminal of the output buffer is connected to an output terminal of the driving unit; a first switch coupled to a power source for selectively transmitting the power provided by the power source to turn on the output buffer; a second switch coupled between the first input terminal of the output buffer and the output terminal of the driving unit; and a third switch coupled between the output terminal of the output buffer and a second input terminal of the output buffer.
These and other objectives of the claimed invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
Please refer to
The equivalent capacitors are coupled to a first driving circuit 16 through thin film transistors (e.g., thin film transistor 28) controlled by a gate line 26 corresponding to the row of pixels. The equivalent capacitors are coupled to a common voltage Vcom, which is applied to one of the substrates mentioned above. The circuitry outside the driving device 22-1 has been disclosed in US Patent Application Publication No. US 2003/0234757, and is therefore not repeated in detail here.
As shown in
The driving unit having an output terminal E1 and an input terminal E4, comprises an output buffer 62 and two switches S1 and S2, where the output buffer 62 has a unit gain and is typically implemented utilizing an operational amplifier or an operational transconductance amplifier (OTA). The output terminal E1 is coupled to the thin film transistor 28 through a data line DL1. In addition, the input terminal E4 is coupled to one of the power transmission lines through the multiplexer MUX1 according to a control signal D1.
As shown in
Please refer to
Please refer to
Please refer to
Please refer to
Please refer to
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.