Liquid crystal display apparatus

Details Liquid crystal display apparatus Liquid crystal display apparatus

1986-05-12

1989-02-07

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340718, 340811, 350332, G09G 336

Patent

active

048034800

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a liquid crystal display apparatus used to carry out the display of a still picture.


BACKGROUND ART

It is proposed to display a television picture by using, for example, a liquid crystal.
In FIG. 6, 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 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. Picture element switching 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 the 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.n1, M.sub.12, M.sub.22, M.sub.n2, . . . M.sub.1m, 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. Scanning line switching 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) direction 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. 7A and 7B. Then, the shift register 2 generates signals .phi..sub.H1 to .phi..sub.Hm at every picture element period as shown in FIG. 7C, while the shift register 4 generates signals .phi..sub.V1 to .phi..sub.Vn at every one horizontal period as shown in FIG. 7D. Further, to the input terminal 1, there is supplied a signal as shown in FIG. 7E.
When the signals .phi..sub.V1 and .phi.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 that at the target terminal 3 is supplied to the liquid crystal cell C.sub.11. As a result, in the capacitive 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 C

REFERENCES:
patent: 4319237 (1982-03-01), Matsuo et al.
patent: 4430648 (1984-02-01), Togashi et al.
patent: 4485380 (1984-11-01), Soneda et al.
patent: 4586039 (1986-04-01), Nonomura et al.
patent: 4600274 (1986-07-01), Morozumi

Affiliated with

Also associated with

Rating

Liquid crystal display apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Liquid crystal display apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal display apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1087059