Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1986-04-22
1988-05-17
Birmiel, Howard A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340703, 350335, 350341, G02F 1133, G02F 123
Patent
active
047454067
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a liquid crystal display apparatus used, for example, to receive a television picture.
BACKGROUND ART
It is proposed to display a television picture by using, for example, a liquid crystal.
In FIG. 11, reference numeral 1 designates an input terminal to which a television video signal is supplied. The signal from this input terminal 1 is supplied through switching elements M.sub.1, M.sub.2, . . . M.sub.m, each of which is formed of, for example, an N-channel FET, to lines L.sub.1, L.sub.2, . . . L.sub.m in the vertical (Y axis) direction where m is the number corresponding to the number of the picture elements in the horizontal (X axis) direction. Further, there is provided a shift register 2 having m stages. This shift register 2 is supplied with clock signals .phi..sub.1H, .phi..sub.2H each having a frequency m times the horizontal frequency. Drive pulse signals .phi..sub.H1, .phi..sub.H2, . . . .phi..sub.Hm, which are derived from the respective output terminals of this shift register 2 and sequentially scanned by the clock signals .phi..sub.1H, .phi..sub.2H, are supplied to the respective control terminals of the switching elements M.sub.1 to M.sub.m. To the shift register 2, there are supplied a low potential (V.sub.SS) and a high potential (V.sub.DD) and thereby drive pulses of two potentials are generated.
To the respective lines L.sub.1 to L.sub.m, there are connected one ends of switching elements M.sub.11, M.sub.21, . . . M.sub.nl, M.sub.12, M.sub.22, . . . M.sub.n2, . . . M.sub.lm, M.sub.2m, . . . M.sub.nm, which are each formed of, for example, an N-channel FET, where n is the number corresponding to the number of the horizontal scanning lines. The other ends of these switching elements M.sub.11 to M.sub.nm are respectively connected through liquid crystal cells C.sub.11, C.sub.21, . . . C.sub.nm to a target terminal 3.
Further, there is provided a shift register 4 having n stages. This shift register 4 is supplied with clock signals .phi..sub.1V and .phi..sub.2V each having a horizontal frequency. Drive pulse signals .phi..sub.V1, .phi..sub.V2, . . . .phi..sub.Vn, which are derived from the respective output terminals of this shift register 4 and sequentially scanned by the clock signals .phi..sub.1V and .phi..sub.2V, are supplied through gate lines G.sub.1, G.sub.2, . . . G.sub.n in the horizontal (X axis) directions to control terminals of the switching elements M.sub.11 to M.sub.nm at every rows (M.sub.11 to M.sub.1m), (M.sub.21 to M.sub.2m), . . . (M.sub.n1 to M.sub.nm) in the X axis direction, respectively. Also, the shift register 4 is supplied with the potentials V.sub.SS and V.sub.DD similarly to the shift register 2.
That is, in this circuit, to the shift registers 2 and 4, there are supplied the clock signals .phi..sub.1H, .phi..sub.2H, .phi..sub.1V and .phi..sub.2V which are shown in FIGS. 12A and 12B. Then, the shift register 2 generates signals .phi..sub.H1 to .phi..sub.Hm at every picture element periods as shown in FIG. 12C, while the shift register 4 generates signals .phi..sub.V1 to .phi..sub.Vn at every one horizontal period as shown in FIG. 12D. Further, to the input terminal 1, there is supplied a signal as shown in FIG. 12E.
When the signals .phi..sub.V1 and .phi..sub.H1 are generated, the switching elements M.sub.1 and M.sub.11 to M.sub.1m are turned on and thereby a current path from the input terminal 1 through M.sub.1, L.sub.1, M.sub.11, C.sub.11 to the target terminal 3 is formed, through which a potential difference between the signal supplied to the input terminal 1 and the signal at the target terminal 3 is supplied to the liquid crystal cell C.sub.1 l. As a result, in the capacity portion of the cell C.sub.11, there is sampled and then held a charge corresponding to a potential difference made by the signal of a first picture element. The optical transmissivity of the liquid crystal is changed in response to this charge amount. The similar operation is sequentially carried out on the following cells C.sub.12 to
REFERENCES:
patent: 4600274 (1983-03-01), Morozumi
Hayashi Yuji
Soneda Mitsuo
Birmiel Howard A.
Sony Corporation
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