Television – Basic receiver with additional function – For display of additional information
Patent
1997-08-15
1998-07-21
Lee, Michael
Television
Basic receiver with additional function
For display of additional information
348731, H04N 544, H04N 550
Patent
active
057841250
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a portable liquid crystal display device which makes use of a liquid crystal panel, and to a method of changing the received channel status of such a portable liquid crystal display device.
BACKGROUND OF THE INVENTION
A known type of liquid crystal panel is the passive liquid crystal panel in which the construction consists of a liquid crystal material sandwiched between two transparent substrates which are made of glass or film, with electrodes provided on the opposing faces of the two substrates so that they are mutually perpendicular, and the active liquid crystal panel, in which an electrode is provided on one of the opposing faces of two substrates, and a TFT thin-film transistor, MIM (metal-insulator-metal), or the like is formed on the opposing face.
Liquid crystal panels can be classified in terms of operation as TN (twisted nematic) and STN (super twisted nematic) liquid crystal panels, the STN mode of operation being used in passive liquid crystal panels, and the TN mode being used in both active liquid crystal panels and passive liquid crystal panels.
In consideration of the above types of liquid crystal panels, recent years have seen the appearance of commercial product embodiments of a portable TV receiver, which consists of a compact, lightweight liquid crystal display device with a TV reception function, and a liquid crystal display projector, these products taking advantage of the benefits of liquid crystal panels. With this situation as a backdrop, there is a demand for compact, easy-to-operate, low-cost portable liquid crystal display devices.
A liquid crystal TV receiver (hereafter referred to as an LCD TV receiver), which is an example of liquid crystal display devices of the past, will be used to explain the prior art, with reference made to FIG. 3 and FIG. 4, FIG. 3 shows the system block diagram of an LCD TV of the past, while FIG. 4 shows an LCD panel 30, which is the display section which is shown in the system block diagram of FIG. 3.
In FIG. 3, the signal for a desired channel is selected by a tuner 11 from the RF signal that is picked up by an antenna 10, this signal being sent to an intermediate frequency amplifier 12.
The tuning CPU 22 memory address is selected by means of a switching section 20, and a signal 26, which is the channel signal stored in the specified address in memory, is applied to the tuner 11 to select the desired station.
To store the desired channel signal into a specified memory address, the address in the memory of the tuning CPU 22 is selected by a switching operation of the switching section 20, this displaying on the screen the contents of one memory address, so that the signal 25, which is extracted from the intermediate frequency amplifier 12, is stored in memory.
The output of the intermediate frequency amplifier 12 consists of a sound (audio) and a picture (video) signal, the processing of the sound signal being omitted from FIG. 3. The picture signal is input to a color demodulator 14, where it is demodulated into the color signals R (red), G (green), and B (blue).
The output of the color demodulator 14 is applied to a data selector 16, wherein it is wave-shaped, after which the signal is input to the control circuit 18. The data selector 16 has input to it the signal from the switching section 20 and the signal 27 from the tuning CPU 22. At the data selector 16, the output signal from the color demodulator 14 is superimposed to the signal 27, in order to enable the display of superimposed information such as characters on the picture signal.
The output signal from the data selector 16 is input to the control circuit 18, which converts it into a signal that can be displayed as a picture on the LCD panel 30.
Because the liquid crystal display device is a passive type display device, illumination known as backlighting is provided underneath the LCD panel 30, in the form of a backlight 40, which results in a bright screen display. While a fluorescent tube is generally used as the backlight, it is a
REFERENCES:
patent: 5299010 (1994-03-01), Nakazawa et al.
patent: 5315392 (1994-05-01), Ishikawa et al.
patent: 5410361 (1995-04-01), Lee
Okano Terutaka
Shibuya Hideaki
Citizen Watch Co. Ltd.
Lee Michael
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