Liquid crystal display device having a digitizer
First Claim
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1. A liquid crystal display device used by a main system, comprising:
- a digitizer for producing signals indicative of a location by an external input and driven according to a first clock generated by a first clock generator;
a liquid crystal display device for displaying a predetermined information according to the signal from the digitizer, the liquid crystal display device having first and second substrates with a liquid crystal layer interposed therebetween, and data and gate lines; and
a printed circuit board having a drive circuit for controlling the digitizer and the liquid crystal display, wherein the drive circuit including;
a power supply for supplying a voltage to the LCD panel and the digitizer;
a clock generator for producing clock signals to drive the LCD device and the digitizer;
an analog to digital (A/D) converter for converting analog signals to digital signals;
a gamma circuit for correcting gamma characteristics of the LCD device;
a first input/output (I/O) unit for conveying analog signals from the digitizer to the A/D converter and conveying signals from the controller to the digitizer;
a second input/output (I/O) unit for transferring digital signals in the form of x-y coordinate values from the A/D converter to the main system;
data and gate drivers driven by the clock generator; and
a controller for controlling all components of the drive circuit.
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Abstract
The present invention discloses a first frame, a liquid crystal panel supported by the first frame, the liquid crystal panel having a display region and a side wall portion, a digitizer located on the liquid crystal panel, the digitizer having a peripheral portion, and a second frame having a front surface with an opening region and a side wall portion, the front surface pressurizing the peripheral portion of the digitizer, the opening region formed at a location corresponding to the display region of the liquid crystal panel.
7 Citations
19 Claims
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1. A liquid crystal display device used by a main system, comprising:
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a digitizer for producing signals indicative of a location by an external input and driven according to a first clock generated by a first clock generator; a liquid crystal display device for displaying a predetermined information according to the signal from the digitizer, the liquid crystal display device having first and second substrates with a liquid crystal layer interposed therebetween, and data and gate lines; and a printed circuit board having a drive circuit for controlling the digitizer and the liquid crystal display, wherein the drive circuit including; a power supply for supplying a voltage to the LCD panel and the digitizer; a clock generator for producing clock signals to drive the LCD device and the digitizer; an analog to digital (A/D) converter for converting analog signals to digital signals; a gamma circuit for correcting gamma characteristics of the LCD device; a first input/output (I/O) unit for conveying analog signals from the digitizer to the A/D converter and conveying signals from the controller to the digitizer; a second input/output (I/O) unit for transferring digital signals in the form of x-y coordinate values from the A/D converter to the main system; data and gate drivers driven by the clock generator; and a controller for controlling all components of the drive circuit. - View Dependent Claims (2, 3)
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4. A liquid crystal display device having a digitizer, comprising:
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a first frame; a liquid crystal panel supported by the first frame, the liquid crystal panel having a display region and a side wall portion; a digitizer located on the liquid crystal panel, the digitizer having a plurality of digitizer electrodes at a peripheral portion; and a second frame having a front surface with an opening region and a side wall portion, the front surface covering the digitizer electrodes and pressurizing the peripheral portion of the digitizer, the opening region at a location corresponding to the display region of the liquid crystal panel. - View Dependent Claims (5, 6)
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7. A flat panel display device, comprising:
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a display panel having a display area and a peripheral area; a digitizer over the display panel, the digitizer having first and second sets of digitizer electrodes located at an area corresponding to the peripheral area of the display panel; and gate and data printed circuit boards connected to the display panel, wherein at least one of the gate and data printed circuit boards has a drive circuit, the first set of the digitizer electrodes is connected to the gate printed circuit board, and the second set of the digitizer electrodes is connected to the data printed circuit board. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification