JP3244618B2 - Liquid crystal panel and projection type image display device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel for a display device, and more particularly to a liquid crystal panel suitable for a projection type color display device.

[0002]

2. Description of the Related Art A display device using a liquid crystal panel was initially provided.
Improving the yield was a major proposition, but in recent years it has also been increased in size. By the way, the liquid crystal panel is composed of an independent liquid crystal element for each pixel, but this liquid crystal element does not emit light by itself, but functions as a light valve for modulating transmitted light for display. In recent years, attention has been paid to a device that utilizes the characteristics of the liquid crystal panel as a light valve so as to cope with an increase in size by a projection display method.

FIG. 5 shows an example of a color liquid crystal projection type display device using such a transmission type liquid crystal panel as a light valve. In FIG.
2 is a filter for removing infrared light (IR) and ultraviolet light (UV), 23 and 24 are total reflection mirrors, 25 is a blue light reflection dichroic mirror, 26 and 27 are green light reflection dichroic mirrors, and 28 is red. A light reflecting dichroic mirror, 29 is a liquid crystal panel serving as a light valve for red, 30 is a liquid crystal panel serving as a light valve for green,
Reference numeral 31 denotes a liquid crystal panel serving as a light valve for blue light, and reference numeral 32 denotes a projection lens system.

The white light source 21 is composed of a light source that generates visible light having a continuous spectrum, such as a halogen lamp. The white light emitted from the white light source 21 is sequentially reflected by a blue light reflecting dichroic mirror 25 and a green light reflecting light. The color is separated by the dichroic mirror 26 and separated into blue light B, green light G, and red light R. The blue light B is reflected by the total reflection mirror 23 and then enters the liquid crystal panel 31 for blue, the green light G is incident on the liquid crystal panel 30 for green, and the red light R is incident on the liquid crystal panel 29 for red. .

The light of each color of blue, green and red incident on each of the liquid crystal panels 29, 30 and 31 is image-modulated here, and then the green light reflecting dichroic mirror 27, the total reflecting mirror 24 and the red light reflecting The three colors are combined on the same optical axis by the dichroic mirror 38 and are incident on the projection lens system 32. Then, from here, the image is projected on a predetermined transmission type or reflection type screen, and an enlarged color image is displayed. In this example, as described above, the transmission type liquid crystal panel is used as the light valve, but the reflection type liquid crystal panel can be used as the light valve.

By the way, in such a color liquid crystal projection display device, as is apparent from FIG. 5, three liquid crystal panels corresponding to R, G, and B colors are used, and color separation is performed by a dichroic mirror or the like. Light is modulated for each color by a light valve composed of a liquid crystal panel, and is combined again by a dichroic mirror or the like to form a color image. Therefore, in the case of FIG. Of the colors, the G color image is a mirror image of the other two R and B images, and therefore, to obtain a normal composite image, the G color image needs to be mirror-inverted. is there.

Further, the projection type display device may be variously installed depending on the environment in which it is used, for example, on a floor or suspended from a ceiling or the like. In the projection mode for the screen, projection display from behind using a projection screen,
There is a projection display from the front using a reflection type screen. Therefore, in order to cope with these, mirror image inversion of an image is required. Therefore, in such a case, usually, the horizontal and vertical scanning directions of each liquid crystal panel are inverted so that mirror image inversion can be obtained.

The number of pixels of a liquid crystal panel for a light valve used in a conventional liquid crystal projection display device is as follows.
In general, the number of pixels corresponding to the image data to be displayed is set to the minimum necessary number. For example, the number of pixels of display image data is VGA (Vedeo Graphic A) which is a standard of a standard video signal of a personal computer.
rray) specification, 640 pixels in the horizontal direction x 48 in the vertical direction
0 pixels = 307200 pixels. In this case, the number of pixels of the liquid crystal panel is also 640, the number of horizontal scanning lines is also 480, and the number of vertical scanning lines is also 480. Are matched.

FIG. 6 shows a conventional example of a horizontal scanning circuit used for such a liquid crystal panel.
And a clock signal control circuit 34 that operates in synchronization with the clock signal HCK. The shift register 33 is composed of a plurality of units 35, and the clock signal control circuit 34 is synchronized with the clock signal HCK.
, And sequentially generates pulses on the data lines, and the pulses drive the horizontal scanning lines H of the liquid crystal panel to perform scanning.

At this time, the scanning direction of the shift register 33 is determined by the scanning direction control signal L / R. In either case, the start pulse signal Hst
Scan is started by art. Here, assuming that the number of the scanning lines H is n (for example, n = 640), as shown in the figure, these scanning lines H do not correspond to scanning from left to right (L → R). , H from the left
1, H2, H3,..., Hn-2, Hn-1, Hn can be numbered, while scanning from right to left (L ← R)
, H (n) and H (n−
1), H (n−2),..., H (3), H (2), H (1).

On the other hand, the unit 35 of the shift register 33
Is designed to drive a scanning line on the output side in the scanning direction, so that in order to perform bidirectional scanning, one more scanning line is required. Therefore, the number n of the scanning lines
, The number of the units 35 of the shift register 33 is n + 1 (= 641), and as shown in the figure, in order from left to right scanning (L → R), 1, 2,
3,..., N-1, n, n + 1, while
Corresponding to scanning from right to left (L ← R), (n + 1), (n), (n−1),..., (3), (2), (1) )
And are numbered. That is, in this case, the number of units of the shift register 33 is 641 corresponding to 640 scanning lines.

FIG. 7 is a timing chart showing the operation of the horizontal scanning circuit. The upper half of FIG.
R = “H” and the scanning direction is from left to right, and the lower half is L / R = “L” and the scanning direction is from right to left. The shift register 33 is configured to sequentially shift pulses from the data lines H1 to Hn and vice versa from the data lines H (n) to H (1) at both the rising and falling timings of the clock signal HCK. Thus, it can be seen that the shift direction of the shift pulse is reversed left and right by the scanning direction control signal L / R. A point to be noted here is that the phase relationship between the shift pulse and the clock signal changes depending on the scanning direction even for the data lines having the same number.

When the number of data in the horizontal scanning direction is V
Assuming an even number (640 lines) as in the case of the GA specification, when scanning from left to right, the first scanning line in the scanning direction is the first, odd numbered, and the last data line is the 640th line. So it will be an even number. Conversely, when scanning from right to left, the first line (first) is the 640th line when scanning from left to right, so it is an even-numbered line, and the last line (640th) is one. Second, it will be odd. In other words, in this case, the same data line is replaced with an odd number and an even number depending on the scanning direction.

By the way, at this time, the shift register
As described above, it is assumed that writing to the data line is performed at both the rising and falling of the clock signal, an odd number is written at the falling of the clock signal, and an even number is written at the rising of the clock signal. In this case, the phase of the clock signal required to operate the shift register unit that scans the odd-numbered data lines differs from that of the shift register unit that scans the even-numbered data lines. , The phase is inverted.

Then, when the scanning direction is from left to right, the falling of the clock signal appears first after the start pulse signal Hstart rises, and when the scanning direction is from right to left, after the start pulse signal Hstart rises. This time, the rising edge of the clock signal must appear first. Therefore, as shown in FIG. 7, it is necessary to invert the phase of the clock signal HCK between the upper half where the scanning direction is left to right and the lower half where the scanning direction is right to left. Will occur.

That is, if the clock signal HCK is operated with the phase of the clock signal HCK being the same as the upper case in the lower case of FIG. 7, the start pulse signal Hstart is generated in the upper case. After the time t _H , the scanning of the data line H1 starts at the time t ₀ when the clock signal HCK first falls, whereas in the lower case, the time when the clock signal HCK first rises at the time t ₀ Instead, the time t ₁ is reached, and the scan start time of the data line Hn at this time is also t ₁ , which is delayed by one clock.

Therefore, in the conventional example of the horizontal scanning circuit shown in FIG. 6, a clock signal control circuit 34 is provided, whereby a clock signal HCK inputted from the outside is provided in accordance with the scanning direction control signal L / R. The phase is shifted and supplied to the shift register 33.
As shown in FIG.
In order to obtain the phase inversion. By the way, only the horizontal scanning circuit has been described above, but the same applies to the vertical scanning circuit.

A conventional example of a shift register capable of performing such bidirectional scanning and performing a shift operation at both rising and falling timings of a clock signal is described in, for example, JP-A-2-137886. .

[0019]

In the above prior art, it cannot be said that sufficient consideration has been given to the simplification of the peripheral circuit of the liquid crystal panel and the change in characteristics due to the switching of the scanning direction.
As described below, there is a problem in terms of performance improvement and cost reduction.

That is, in the prior art, it is necessary to invert the phase of the clock signal depending on the scanning direction. For this reason, a clock signal control circuit is used. Then,
This clock signal control circuit outputs the input clock signal as it is in the one scanning direction without changing the phase, and shifts the phase of the input clock signal by π / 2 in the other scanning direction. In the case of including the clock signal processing system, the symmetry of the signal processing path is lost according to the scanning direction,
In addition, since the symmetrical shape is lost from the layout of the peripheral circuit of the liquid crystal panel, there is a possibility that the maximum operation speed changes depending on the scanning direction. This means that, for example, in the case of a driving method in which writing to the data line is performed at both the rising and falling of the clock signal, it is necessary to maintain the duty ratio of the clock signal at 50%. The difference causes a distortion or the like of the clock signal waveform due to the difference, which is a major factor of performance degradation.

Also, the frequency of the clock signal is at least about 2 in the case of the VGA specification of 640 pixels × 480 pixels.
From 8 MHz, the higher one is about 13 in the case of the 1280 × 1024 pixel specification, which is a higher definition video signal standard that is common in engineering workstations and the like.
Peripheral circuits need to operate stably even at such a high frequency as far as 0 MHz, and therefore, a peripheral drive circuit incorporated in the panel is required to be as simple as possible. Therefore, the conventional technique has a problem in terms of performance improvement and cost reduction.

An object of the present invention is to eliminate the possibility of performance degradation due to reversal of the scanning direction of horizontal scanning and vertical scanning, and to obtain a sufficient cost reduction by applying the invention to a light valve of a projection type liquid crystal display device. An object of the present invention is to provide a liquid crystal panel as described above.

[0023]

In order to solve the above-mentioned problem, a pixel in a horizontal direction driven by at least one of a horizontal scanning circuit and a vertical scanning circuit comprising a shift register which shifts at every rising and falling of a clock pulse signal is provided. in the liquid crystal panel at least one of the number of pixels the number of vertical displays the image data of the even number (n), the even-n
The liquid crystal display unit having at least one of the horizontal direction and 1 pixel than at least one of the numbers of pixels in the vertical direction greater horizontal pixel count of the number of image data (n + 1) and the vertical pixel number (n + 1) is provided, the shift The register is
One more than prime number (n + 1) or vertical pixel number (n + 1)
(N + 2) units have clock signals
And an inverted signal thereof are inputted.
The signal line connected to the pixel is
Between each of the (n + 2) units that make up the star
It is arranged and connected, and the image data is displayed by the liquid crystal display unit.

That is, according to the present invention, the number of pixels of the display data is n × m (m and n are both even numbers). It is provided with a plurality of pixels.

[0025]

By using a liquid crystal display unit which is one pixel larger than the number of pixels of the image data, the number of pixels of the liquid crystal display unit becomes odd. As a result, even if the scanning direction is changed, the pixel number at the scanning start point is changed. It will never be an even number and will always be an odd number. As a result, even when the scanning direction is changed, it is not necessary to change the phase of the clock pulse signal for driving the shift register included in the scanning circuit. Therefore, a circuit for inverting the phase of the clock pulse signal can be omitted.
The size of the peripheral circuit can be reduced.

At this time, the number of pixels of the liquid crystal display increases, but the increase is very small relative to the total number of pixels, and since the number of unit parts increases in the same manufacturing process. However, the increase in cost is very small. On the other hand, the addition of a circuit for inverting the phase of the clock pulse signal greatly increases the circuit scale in the peripheral circuit.
This is a significant cost disadvantage. Therefore, according to the present invention, a sufficient cost reduction can be obtained despite an increase in the number of pixels of the liquid crystal display section.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal panel according to the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the present invention. In this embodiment, the number of pixel data in the horizontal direction is n (n = even) and the number of pixel data in the vertical direction is m (m
In the drawing, reference numeral 10 denotes a liquid crystal panel, 11 denotes a horizontal scanning circuit, 12 denotes a first sampling circuit, and 13 denotes a second sampling data.
Is a vertical scanning circuit, 15 is a unit pixel circuit, and 16 is a liquid crystal display.

When the liquid crystal panel 10 is used as a transmission type light valve, a TFT formed on a glass substrate is used.
(Thin Film Transister) chip, when used as a reflection type light valve, a MOS (Metal Oxide Semiconductor) chip formed on a silicon substrate is used, and a peripheral driving circuit, that is, a horizontal scanning circuit 11, a first scanning circuit A sampling circuit 12, a second sampling circuit 13,
A vertical scanning circuit 14 and a liquid crystal display section 16 are formed thereon. The unit pixel circuit 15 is arranged in the horizontal direction.
(n + 1) pieces and (m + 1) pieces in the vertical direction are arranged, respectively, and are arranged in a matrix of (n + 1) × (m + 1) to form the liquid crystal display section 16. It is composed of a transistor 17, a capacitor 18, and a pixel liquid crystal element 19. Therefore, the liquid crystal display unit 16 has one row and one column more than the minimum number of pixels required for displaying image data (m rows and n columns) to be displayed. It is an odd column.

The horizontal scanning circuit 11, as shown in FIG.
The horizontal scanning clock signal HCK and its inverted signal, which are constituted by a shift register composed of (n + 2) units 36, are inputted to the respective units 36 of the shift register constituting the horizontal scanning circuit 11. The horizontal scanning direction control signal L /
The scanning direction is switched by R to operate.

A start pulse signal Hstart for horizontal scanning
Functions to define the scanning start timing of the horizontal scanning circuit 11. When the start pulse signal Hstart is input, the horizontal scanning circuit 11 responds to the scanning direction control signal L / R from left to right. , Or from right to left.

The first sampling circuit 12 and the second sampling circuit 13 are provided with a time-division sampled first sampling circuit.
And the second video signals VIDEO1 and VIDEO2 to each unit pixel circuit 15. The reason why the first and second video signals VIDEO1 and VIDEO2 are used will be described later.

Although not shown in detail, the vertical scanning circuit 14 is constituted by a shift register having a plurality of units, like the horizontal scanning circuit 11,
Here, the number of the units is (m + 2). The externally input clock signal VCK for vertical scanning and its inverted signal are supplied to the vertical scanning circuit 14.
And operates by switching the scanning direction according to a vertical scanning direction control signal D / U. The scanning start timing is defined by the pulse signal Vstart, and when the start pulse signal Vstart is input, the scanning direction control signal U / D
, The scanning is started from top to bottom or from bottom to top.

As described above, the unit pixel circuit 15 includes the MOS transistor 17, the capacitor 18, and the pixel liquid crystal element 19. And MOS
The transistor 17 is switched by a gate line which is a scanning line of the vertical scanning circuit 14, and the horizontal scanning circuit 11
From the data line which is the scanning line of each sampling circuit 12,
The capacitor 18 functions to pass a video signal supplied to the drain electrode via the MOS transistor 17, and the pixel liquid crystal element 19 is held by the capacitor 18. It functions as a light valve that controls the amount of light passing through each pixel according to the video signal.

Next, the operation of this embodiment will be described. In this embodiment, as described above, the first sampling circuit 12 and the second sampling circuit 13 are used to alternately display the first and second video signals VIDEO1 and VIDEO2 sampled in a time-division manner. Part 16
However, since the relationship between the data lines of the horizontal scanning circuit 11 and the liquid crystal display unit 16 is not changed by this, first, the connection between the data lines of the horizontal scanning circuit 11 and the liquid crystal display unit 16 is performed. It will be described in relation to

As described above, as shown in FIG. 2, the horizontal scanning circuit 11 controls the number of pixels of the liquid crystal display unit 16 in the horizontal direction.
It has (n + 2) shift register units 36 one more than (n + 1). So, these units 3
6, from left to right, 1, 2, 3,..., N, n
+1 and n + 2, and conversely, from right to left,
Numbers are given as (1), (2), (3), (n), (n + 1), (n + 2). Then, scanning from left to right (L
→ R), H1, H2, H3,
.., Hn, Hn + 1, and conversely, H (1), H (2), H (H) correspond to scanning from right to left (L ← R).
(3) Number H (n) and H (n + 1).

Then, as apparent from the figure, in the scan from left to right (L → R), the number of the last data line is Hn + 1, and conversely, the scan from right to left (L ← R)
, The number of the last data line is H (n + 1). Here, as described above, since n = even number, after all, in this embodiment, scanning from left to right (L → R)
It can be seen that the number of the last data line is odd even in the scanning from right to left (L ← R).

When scanning from left to right (L → R), the number of the first data line is H1 and it is natural that the number of the last data line is Hn + 1. Is also an odd number, and this data line is the first data line at the time of scanning from right to left (L ← R), so that the number H (1) is also an odd number. Therefore,
According to this embodiment, the same data line is not replaced with an odd number and an even number depending on the scanning direction.
In any case, the first data line at the start of scanning always has an odd number.

FIG. 3 is a timing chart showing the operation of this embodiment. As in the case of the conventional example shown in FIG. 7, the upper half sets the scanning direction control signal L / R = "H" to change the scanning direction from left to right. And the lower half is L / R = “L”,
The case where the scanning direction is changed from right to left is shown. In the case of the embodiment of the present invention shown in FIG. 3, unlike the conventional example shown in FIG. 7, the upper side where the scanning direction is left to right is also the lower side where the scanning direction is right to left. In the case of (1), after the start pulse signal Hstart is generated, the first data line to be scanned is also the odd-numbered data line.

As a result, in this embodiment, as shown in FIG. 3, while the phase of the clock signal HCK remains the same,
Regardless of whether the scanning direction is from the left to the right in the upper direction or the scanning direction is from the right to the left in the lower direction, the start pulse signal H
After the start occurs, the first appearing clock signal HC
At the falling time t ₀ of K, scanning from the first data line can be started immediately. Therefore, according to this embodiment, it is not necessary to invert the phase of the clock signal when switching the scanning direction, so that a clock control circuit becomes unnecessary, and the circuit configuration around the liquid crystal panel can be simplified. Note that the above description is completely the same for the vertical scanning circuit 14, and therefore a detailed description of the vertical scanning circuit 14 is omitted.

Returning to FIG. 1, next, in this embodiment, the first and second video signals VIDEO sampled in a time-division manner will be described.
1, VIDEO2 is used, and the reason why the first sampling circuit 12 and the second sampling circuit 13 are provided accordingly will be described. The liquid crystal display element
If a DC voltage is applied for a long time, there is a risk of deterioration. Therefore, in an image display device using a liquid crystal panel, a technique of inverting the voltage polarity of a video signal for each frame period is adopted. It is customary. In this case, flicker may occur in the frame cycle due to fluctuations in the voltage neutral point or the like.

In order to prevent the flicker, a video signal is time-divisionally sampled and distributed to two video signal lines, and the polarities of the video signals on these signal lines are inverted with each other. There is a method of alternately inputting data to the data lines. In the embodiment of FIG. 1, this method is applied. Therefore, the first sampling circuit 12 and the second sampling circuit 13 are provided as described above. And the first and second video signals VIDEO1, VIIDE1
DEO2 is supplied.

Here, as an example, in the embodiment of FIG.
The first video signal VIDEO1 is a signal input to the odd-numbered data line, and the second video signal VIDEO2 is a signal input to the even-numbered data line. 12 and the second sampling circuit 13, which are alternately selected by the data lines of the horizontal scanning circuit 11 and applied to the unit pixel circuit 15 in the liquid crystal display unit 16. By the way, in this case, in the related art, the video signal input to the data line in the first column is switched between the first video signal VIDEO1 and the second video signal VIDEO2 depending on the scanning direction. Therefore, in the prior art, the first video signal VIDEO1 and the second video signal VIDEO1
Some control circuit for switching 2 according to the scanning direction is further required.

In the embodiment shown in FIG. 1, however, even if the scanning direction changes, the data lines in the first column do not change to odd and even numbers, but always to odd numbers. Even if preventive techniques are applied,
There is no need for a control circuit or the like for switching the video signal, so that the performance can be sufficiently improved without further increasing the scale of the peripheral circuit.

FIG. 4 is a specific example of a shift register in a horizontal scanning circuit according to an embodiment of the present invention.
37 indicates a shift register. The shift register 37 includes two clocked inverters 38 to which a clock signal CK (abbreviation of HCK) and an inverted signal CK # of the clock signal CK (indicated by an overline in the figure) are supplied. A unit combining a direction control signal R / L and two clocked inverters 39 to which an inverted signal R / L of the scanning direction control signal R / L (indicated by an overline in the figure) is input. 40 are configured.

As described above, the number of data lines is one more than the number n of pixels in the column direction of the video signal to be displayed, and is the same as the number n + 1 of columns of the liquid crystal display unit 16 (FIG. 1). Has become. And, at both ends of the shift register 38,
Gates 41 and 42 with a clock for controlling the input direction of the start pulse signal Hstart are provided. The vertical scanning circuit 14 has the same configuration, the scanning direction control signal is D / U, and the start pulse signal is the start pulse signal Vstart for vertical scanning.
The configuration can be the same except for the point.

Next, in the above embodiment, the liquid crystal display 1
6 will be described. As described above, the number of columns of the liquid crystal display unit 16 is one more than the number n of pixels in the column direction of the video signal to be displayed, and the number of rows is also one more than the number m of pixels in the column direction in the row direction. Many have been. As a result, the last one in the scanning direction is not displayed because there is no video data, and is displayed from the first column to the n-th column in the scanning direction in the horizontal scanning direction, and is displayed in the vertical scanning direction. From the first row to the m-th row, so that when the scanning direction is changed, the last column in which nothing is displayed changes left and right, and the last row changes up and down. Therefore, when three liquid crystal panels of R, G, and B are used for color display as shown in FIG. 5, for example,
Since the display area is different between a liquid crystal panel in which the scanning direction is inverted and a liquid crystal panel in which the scanning direction is not inverted, it is necessary to perform image registration (registration) in consideration of this.

[0047]

According to the present invention, the peripheral circuits to be built in the liquid crystal panel are simplified, so that the number of elements in the entire peripheral circuits is reduced, and the yield can be improved. Further, as a result, the number of wirings between the elements is reduced, so that the wiring length can be shortened. If the wiring length can be shortened in this way, the parasitic capacitance of the wiring itself or the parasitic capacitance generated by intersection with another wiring can be reduced, and the waveform deterioration and delay of the clock signal caused by the wiring can be reduced. It can be expected that the operation speed will be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a liquid crystal panel according to the present invention.

FIG. 2 is a block diagram showing a horizontal scanning circuit according to one embodiment of the present invention.

FIG. 3 is a timing chart for explaining the operation of the horizontal scanning circuit in one embodiment of the present invention.

FIG. 4 is a circuit diagram showing a specific example of a horizontal scanning circuit in one embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an example of a color projection type image display device using a liquid crystal panel as a light valve.

FIG. 6 is a block diagram showing a conventional example of a horizontal scanning circuit.

FIG. 7 is a timing chart for explaining an operation of a conventional example of a horizontal scanning circuit.

[Explanation of symbols]

 Reference Signs List 10 liquid crystal panel 11 horizontal scanning circuit 12 first sampling circuit 13 second sampling circuit 14 vertical scanning circuit 15 unit pixel circuit 16 liquid crystal display unit 17 MOS transistor 18 capacitor 19 pixel liquid crystal element 21 white light source 22 UV / IR filter 23, 24 Total reflection mirror 25 Blue light reflection dichroic mirror 26, 27 Green light reflection dichroic mirror 28 Red light reflection dichroic mirror 29 Liquid crystal panel for red light 30 Liquid crystal panel for green light 31 Liquid crystal panel for blue light 32 Projection lens system

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-157826 (JP, A) JP-A-4-225317 (JP, A) JP-A-9-5780 (JP, A) JP-A-5 241153 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02F 1/1362 G02F 1/1343 G02F 1/133 G09G 3/36

Claims (5)

(57) [Claims] An apparatus is driven by at least one of a horizontal scanning circuit and a vertical scanning circuit including a shift register that shifts each time a clock pulse signal rises and falls, and at least one of the number of pixels in the horizontal direction and the number of pixels in the vertical direction is reduced. In a liquid crystal panel that displays an even number (n) of image data, the number of pixels in the horizontal direction that is one pixel larger than at least one of the number of pixels in the horizontal direction and the vertical direction of the even number n of image data
a liquid crystal display unit having at least one of (n + 1) and the number of pixels in the vertical direction (n + 1) is provided, and the shift register includes the number of pixels in the horizontal direction (n + 1) or
Is (n + 2) pixels one more than the number of pixels (n + 1) in the vertical direction.
The unit sends a clock signal and its inverted signal to each unit.
No. is configured to be input, the signal lines connected in correspondence with the respective pixels above Schiff
Each of the (n + 2) units that make up the
A liquid crystal panel, wherein the liquid crystal panel is arranged and connected between the liquid crystal panel and the liquid crystal display unit to display the image data. 2. The invention according to claim 1, wherein at least one of the horizontal scanning circuit and the vertical scanning circuit comprises:
A liquid crystal panel formed on the same substrate as the liquid crystal display section. 3. The invention according to claim 1, further comprising a first and a second sampling circuit, wherein the video signal is input to the liquid crystal display section in a time-division sampling manner in the horizontal scanning direction.
A liquid crystal panel comprising an input method of distributing the signals to book video signal lines, inverting the polarities of the video signals of these signal lines to each other, and alternately inputting them. 4. The liquid crystal display according to claim 3, wherein at least one of the horizontal scanning circuit, the vertical scanning circuit, and the first and second sampling circuits is formed on the same substrate as the liquid crystal display unit. A liquid crystal panel characterized by the above-mentioned. 5. A projection type image display device, wherein the liquid crystal panel according to claim 1 is used as a light valve.