JPH0282292A - Method for driving picture display device and picture display device - Google Patents

Abstract

PURPOSE:To allow displaying at an arbitrary magnification ratio or reduction ratio by driving signal electrodes with driving pulses having an arbitrary set period in synchronization with an inputted horizontal synchronizing signal and driving scanning electrodes with specific deriving pulses in synchronization with a vertical synchronizing signal. CONSTITUTION:The driving pulses for the signal electrodes 5 are synchronized with the inputted horizontal synchronizing signal so as to have the arbitrarily set period. The driving pulses for the scanning electrodes 6 are synchronized with the inputted vertical synchronizing signal and are corresponded to each of the bundles of adjacent one or plural pieces of the scanning electrodes 6 so as to have the pulse width approximately coincident with the period of the inputted scanning clock pulses or arbitrarily set integer times or to have the period of arbitrarily set integer times. The display of the original picture at the arbitrary magnification ratio or reduction ratio is enabled in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for driving an image display device and an image display device, and particularly to an image display device in which the main body of the image display device has functions such as enlargement and reduction.

[Conventional technology]

Conventionally, a single-image display device is generally configured to simply drive a display section in accordance with an input image signal and a synchronization signal, and is configured one-to-one with a source of a single-image signal.

In this regard, the image display device proposed in Japanese Unexamined Patent Publication No. 62-272292 integrates an interface circuit that processes various image signals into the image display device in order to be compatible with various image signal generation sources. This built-in device allows a single device to display various image signals from televisions, video devices, personal computers, etc. According to this, it is possible to provide versatility as an image display device.

However, the method disclosed in the above-mentioned publication does not give any consideration to the enlarged or reduced display of the image, so there is a problem that the enlarged or reduced display function must depend on the function of the image signal generation source. was there.

On the other hand, Japanese Unexamined Patent Publication No. 60-207193 proposes a display device in which the main body has an enlargement function.

[Problem to be solved by the invention]

However, the enlargement function shown in the above publication.

There is a problem in that the enlargement is limited to an integer multiple of the original image. Further, since no consideration was given to reduction, there was a problem in that it was not possible to meet the demand for display at an arbitrary magnification or reduction ratio.

An object of the present invention is to solve the above-mentioned conventional problems. In other words, it is an object of the present invention to provide a method for driving an image display device and an image display device that is versatile and capable of displaying an original image at an arbitrary magnification or reduction ratio. Our goal is to provide the following.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a display panel in which a plurality of scanning electrodes and a plurality of signal electrodes are arranged in a matrix, display cells are connected to each intersection of the electrodes, and a signal electrode is driven to be input. An image display comprising a signal electrode drive means for sequentially exciting the signal electrodes with a signal voltage according to an image signal according to a pulse, and a scan electrode drive means for sequentially exciting the scan electrodes according to an input scan electrode drive pulse. In the apparatus, the signal drive pulse is synchronized with an input horizontal synchronization signal and has an arbitrarily set period, and the scanning electrode drive pulse is synchronized with an input vertical synchronization signal and has an arbitrarily set period. A pulse width that substantially matches the period of the input scanning clock pulse or an arbitrarily set integer multiple of the period of the input scanning clock pulse, corresponding to each bundle of one or more scanning electrodes that match, and an arbitrarily set integer. The purpose is to achieve the above object by having twice the period.

Note that the signal electrode parking pulse and the scanning electrode drive pulse may be output after a variably set time has elapsed from the horizontal synchronization signal and the vertical synchronization signal, respectively. According to this, the original image You can set the upper and left limits of the target range for expansion and reduction.

Further, the signal electrode opening pulse and the scanning electrode drive pulse may have a fixed number of pulses that are variably set. According to this, the lower limit, the right You can set the target range.

Furthermore, it is possible to arbitrarily set the sequential excitation start electrodes of the signal electrode and the scan electrode that are sequentially excited according to the signal electrode drive pulse and the scan electrode drive pulse. The display position of can be set arbitrarily.

[Effect]

With this configuration, the object of the present invention is achieved through the following actions.

First, for horizontal expansion and contraction, shortening the period tb of the signal electrode drive pulse results in expansion, and lengthening it results in contraction. In other words, when the period tb is shortened, the horizontal width of the original image that is sequentially inputted in synchronization with the horizontal synchronization signal is 1.
Only a portion of the line image signal is displayed across the entire horizontal width of the display screen, resulting in an enlarged image display.

Conversely, if the period tb is made longer, the image signal of one line will be applied to only some of the signal electrode rows, so the image will be displayed in a reduced size. Since the period tb can be set continuously and arbitrarily, the enlargement rate or reduction rate can be arbitrarily set.

Next, the case of vertical enlargement/reduction will be explained.

Normally, the scanning clock pulse that is input together with the image signal corresponds to each line of the image signal, and cannot be arbitrarily changed on the display device side. Therefore, the driving method is different from the horizontal expansion and contraction described above. That is, basically, adjacent E (E=1
．． 2.3...) By exciting and driving the display cells connected to the bundle of scanning electrodes with the same 1-line image signal, the image in the vertical direction is displayed by E times, while the arbitrarily set R (
R=1.2.3...) by a pulse with twice the period,
The display cell is excited in units of bundles of the scanning electrodes, and the line image signals of the original image are appropriately thinned out and displayed, thereby displaying one image reduced to 1/R. As a result, the vertical expansion or reduction ratio will be E/R 0 For example, E = 1
If ゜R=1, the image display will be the same as the original image, and E=
2. If R=1, the display will be doubled, and if E=1°R=2, the display will be 1/2. Also, E=2°R=3 or E=3. By setting R=5, it is possible to obtain any magnification or reduction ratio, not just an integer multiple.

Note that in the case of vertical enlargement or reduction, line image signals are thinned out as appropriate and displayed.

Although the fidelity of image display is reduced, this is hardly a problem in the case of analog signals such as television and video images. Also,
The above-mentioned fidelity can be increased by providing the number of display cells in the vertical direction multiple times the number of lines on one screen.

Further, as described above, it is possible to set the target range for enlarging or reducing the original image and the display position of the enlarged or reduced image on the display panel.

Note that the image signal may be an analog signal from a television or video signal, or a digital image signal output from a microcomputer or the like.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

FIG. 1 shows an overall block diagram of an embodiment of an image display device of the present invention. The image display device 1 includes an image display panel 2
, a signal electrode drive circuit 3 that drives this image display panel 2
and a scanning electrode drive circuit 4, a drive pulse generation circuit 8 that outputs a signal electrode drive pulse CLKH and a scan electrode drive pulse DV to these drive circuits 3 and 4, respectively, and a display for setting pulse generation conditions of this drive pulse generation circuit 8. It is formed to include a function setting circuit 9. The signal electrode drive circuit 3 and the scan electrode drive circuit 4 are connected to the image display panel 2 via a signal electrode array 5 and a scan electrode array 6, respectively. Further, an image signal DATA is inputted to the signal electrode drive circuit 3 from an image signal generation circuit 10 provided externally, and a horizontal synchronization signal 5YNH1 and a vertical synchronization signal 5YNV are inputted to the drive pulse generation circuit 8 from the image signal generation circuit 10.
, a scanning clock pulse CLKV. As the image signal generating circuit 10, for example, a signal source of an image signal such as a personal computer, a television receiving circuit, a video camera circuit, a communication circuit, etc. can be applied. Note that the image timing signal TO and the image signal DATA may be provided separately or may be provided in a combined state; in the latter case, their separation circuit is provided within the image display device 1. All you have to do is set it up.

Note that the image display device 1, including the image display panel 2, is integrally formed on the same glass substrate or the like.

FIG. 2 shows an example of the configuration of the image display panel 2 of the embodiment shown in FIG. As shown in the figure, the image display panel 2 is constructed by arranging a plurality of signal electrode rows 5 and scanning electrode rows 6 in a matrix, and connecting pixels 21 to the intersections of each electrode.
The pixel 21 can be composed of, for example, a liquid crystal, electroluminescence (EL), plasma display element, or the like.

FIG. 3 shows an example of a specific configuration of the pixel 21.

As shown in the figure, the pixel 21 is a thin film transistor TPT22
and a display cell 23 made of liquid crystal, T
The gate electrode of the PT 22 is connected to the scanning electrode row 6, and the drain electrode is connected to the signal electrode row 5. Further, one electrode of the display cell 23 is connected to the opposing common electrode 24. Alternatively, it may be a color display in which a color filter is laminated on the liquid crystal layer portion.

A method for driving the image display panel 2 shown in FIG. 3 will be explained using FIGS. 4 and 5. In FIG. 5, pixels P(le j) and P (i+1.j+1) in FIG. 4 are turned on, and pixels P(1+ j+1) and P(i+i, j+i) are turned on.
In this case, the signal electrode row 5 is turned off.
The signal voltages D(j) and D(j+1) applied to the scanning electrode array 6, and the scanning voltages G(i) and G applied to the scanning electrode array 6
This shows the timing diagram of (i+1).

When the scanning voltage G(j) is set to "H", the TFTs 22a and 2
2b becomes conductive, and the scanning voltage G (i+1) becomes td
When set to HPj, the TFTs 22c and 22d become conductive; conversely, when set to '''I and Pj, they become non-conductive.

On the other hand, when the display cell 23 is turned on, the signal voltages D(j) and D(j+1) are set to VC+VD for one frame (one screen) and are AC excited to VC-VD for the next frame. Also, when turning off the display cell 23,
Maintain a constant voltage VC.

To perform gradation display, the level of the signal voltage is changed in an analog manner. In addition, as shown in FIG. 6, the signal voltage D
(j), D (j+1) is the selection time Tfi of one line
It is not necessary to apply the voltage for the entire time of display cell 2.
It is only necessary to output the signal voltage for the time required to write the signal voltage to the signal voltage. Therefore, the signal voltages D(j) and D(j+1)
There is no need for the output times to be the same.

The method for driving display cells has been described above using a 2×2 matrix as an example, but nXm (n.

The same applies to the case of the image display panel 2 consisting of a matrix of m=1.2.3...).

FIG. 7 shows a specific embodiment of the signal electrode drive circuit 3 of the embodiment shown in FIG. The signal electrode drive circuit 3 includes a shift register 31 and an electronic switch group 32. 8 shows another embodiment of the signal electrode drive circuit 3, and the difference from FIG. 7 is that a capacitor 33 and a buffer circuit 3 are provided at the output end of the electronic switch group 32.
4 are connected to each other. In addition, capacitor 3
3 is not necessarily necessary, but by providing this, the signal voltages D1 to Dm can be further stabilized. That is, even if the off-resistance of the electronic switch group 12 or the input resistance of the buffer circuit 34 deteriorates, the capacitor 33 can ensure voltage attenuation.

Here, the basic operation of the drive circuit shown in FIG. 7 or 8 will be explained based on the timing chart shown in FIG. 9. This figure shows a basic display in which original images are displayed one-to-one as they are. Signal electrode drive pulse C
LKH has a period obtained by dividing the horizontal synchronizing signal 5YNH into the number m of pixels in the horizontal direction. As a result, drive signals T1 to Tm are sequentially output from the shift register 31 in synchronization with the input signal electrode drive pulse CLKH. Then, the electronic switch group 32 is activated,
The image signal DATA is sequentially sampled, and the signal voltage D
1 to Dm are sequentially applied to the signal electrode array 5. On the other hand, the scan electrode drive circuit 4 generates scan voltages 01 to On having a time width tH corresponding to one line image signal in synchronization with the scan clock pulse CLKV, and sequentially excites the scan electrode array 6.

As a result, one screen (one frame) of image is displayed during the period tF of the vertical synchronization signal 5YNV. here,
FIG. 10 shows still another embodiment of the signal electrode drive circuit 3, and FIG. 11 shows its operation timing chart. In this embodiment, the capacitor 33 and the buffer circuit 34 shown in FIG.
An electronic switch 35 and a capacitor 36 are inserted and connected between them, and the electronic switches 35 are turned on all at once by a latch signal LA. As shown in FIG. 11, this latch signal LA is a signal output from the drive pulse generation circuit 8 at the timing when the last signal voltage Dm for the previous one line period tH is output. In other words,
The image signal DATA sampled by the capacitor 33 at a timing of 1 to Tm by the drive signal is transferred to the latch signal LA.
The signal voltages are input to the buffer circuit 34 all at once via the electronic switch 35 at the timing of , and the signal voltages D1 to Dm are obtained.

Here, the basic idea of the image processing method in the drive pulse generation circuit 8 and the display function setting circuit 9 for enlarging and reducing an image, which are a feature of the present invention, will be explained.

First, horizontal expansion and reduction will be explained using FIG. 12. As shown in FIG. 12, the drive pulse generation circuit 3 generates a horizontal synchronization signal 5Y synchronized with the image signal DATA.
It has an arbitrarily set period tb with respect to NH,
A signal electrode driving pulse CLKH of a pulse train delayed by a phase difference (time) ta from the horizontal synchronizing signal 5YNH is output after a variably set time tc. These times ta, tb, and tc can be arbitrarily set by means described later.

On the other hand, the shift register 31 of the signal electrode drive circuit 3 receives the input horizontal synchronizing signal 5YNH and the signal electrode drive pulse C.
It operates based on two signals, LKH, as shown in the operation timing chart shown in FIG.

Outputs drive signals T1 to 'Pk. Note that in the case of =m in the figure, the enlarged image is displayed over the entire horizontal width of the single-image display panel 2. The time ta determines the horizontal left limit position of the original image to be displayed. Further, the pulse period tb determines the fineness of the image, that is, the enlargement rate or reduction rate.

Further, the time tc is a factor that determines the target range of enlargement or reduction of the original image, and thereby determines the right limit position of the target image. In addition, the first pulse of the signal electrode drive pulse CLKH prevents the drive signal from outputting 1, and
/' By outputting from (j), the display position of the image display panel 2 can be set.

FIG. 14 shows a specific configuration example of the signal electrode drive pulse generation circuit 8a of the drive pulse generation circuit 8 and a configuration example of the display function setting circuit 9a corresponding thereto.As shown in FIG. The generation circuit 8a includes an unstable multivibrator 41, monostable multivibrators 42, 43, and an AND gate 44, and the operation of these multivibrators 41, 42, 43 is controlled by a capacitor provided in the display function setting circuit 9a. 45 and a resistor 46, a capacitor 47 and a resistor 48, and a capacitor 49 and a resistor 50, respectively. The operation of the signal electrode drive pulse generation circuit 8a configured in this manner is described in the first example.
This will be explained using the timing chart shown in FIG. first,
The capacitor 45 and resistor 46 set a pulse period tb that determines the enlargement or reduction ratio of one image. Then, a time ta for determining the left limit position of the target image is set by a capacitor 47 and a resistor 48. In addition, the capacitor 49 and the resistor 50 determine the time tc for determining the right limit position of the target image.
Set. Therefore, when the horizontal synchronization signal 5YNH is input to the astable multivibrator 41, a pulse train CPO with a pulse period tb is output to the AND gate 44. On the other hand, when the horizontal synchronizing signal 5YNH is input, the monostable multivibrator 42 outputs a signal CP1 which becomes LIH'' for a time ta.This signal CP1 causes the monostable multivibrator 43 to output a signal which becomes LIH'' for a time tc. C
P2 is output to AND gate 44. As a result, AND
From 44 onwards, the signal electrode active pulse CLKH shown in FIG.
is output.

Note that the pulse period tb may be generated using a PLL circuit, for example, and the times ta and tC may be configured using other well-known means as long as they can be arbitrarily set variably. The configuration is not limited to that shown in FIG.

Next, vertical enlargement and reduction of an image will be explained.

FIG. 16 shows the timing relationship between the image signal DATA, the vertical synchronizing signal 5YNV input in synchronization with this signal, and the scanning clock pulse CLKV. FIG. 17 shows scanning voltages Gl, G2 . G3. The timing relationship between G4... and the signal electrode opening pulse CLKH is shown.

In the figure, 1 hour te is an element that determines the upper limit position of the image to be enlarged/reduced, and in the illustrated example, the 3rd line (3
The case where the display starts from H) is shown. Further, the illustrated example shows an example in which the image is enlarged twice in the vertical direction and displayed. In other words, two scanning electrodes corresponding to scanning voltages G1 and G2, G3 and G4, etc. that fall on each other are simultaneously excited, and thereby two vertical rows of display cells are driven by the same image signal. This means that twice as many images are displayed. On the other hand, FIG. 18 shows the timing of the scanning electrode drive pulse DV when the image is enlarged four times in the vertical direction. As can be seen from Figures 17 and 18, adjacent E (
E=1.2.3...) Scanning that corresponds to each bundle of scanning electrodes and has a pulse width that approximately matches the period ts of the input scanning clock pulse CLKV and has a period that is E times By exciting with the electrode drive pulse DV,
The original image can be displayed at a magnification of E in the vertical direction. Note that the width of the scan electrode drive pulse DV is as follows.

As shown by dotted lines in FIGS. 17 and 18, the period ts may be multiplied by E. In this case, a one-line image signal corresponding to the last period ts will be displayed.

FIG. 19 shows the timing of the scan electrode drive pulse DV in the case of reducing the display in the vertical direction. The illustrated example is an example in which the image is reduced to 1/2 in the vertical direction.

As can be seen from the figure, the scanning voltages Gl, G2 . By driving G3... with a scanning electrode drive pulse DV having a period R (R=1°2.3...) times the period ts of the scanning clock pulse, a reduction of 1/R (1/2 in the illustrated example) is achieved. Displayed by rate.

It should be noted that if the display is to be enlarged or reduced in the vertical direction at an arbitrary magnification or reduction ratio, this can be achieved by appropriately combining E and R described above. FIG. 20 shows E=3. R=
This shows case 2, and according to this case, a display image having a magnification of 1.5 times can be obtained. According to the same figure, since every other line image signal is thinned out, it is undeniable that the fidelity of the displayed image with respect to the original image decreases slightly, but in the case of TV or video images, I think there is almost no problem.

As described above, by controlling the pulse width of the scan electrode drive pulse DV that drives the scan electrode drive circuit 4, the bundle of scan electrodes that are simultaneously excited, and the period of their sequential excitation, the image can be enlarged in the vertical direction. Alternatively, reduction can be realized at an arbitrary magnification. Furthermore, by setting the time te, the upper limit position of the display target image can be determined, and by further setting the output time tk (in other words, the number of pulses) of the scanning electrode drive pulse DV, the vertical position of the target image can be determined. The lower limit position of the direction can be determined. Setting of the times te and tk can be easily realized by the method shown in FIG. 14 or other well-known means.

Furthermore, by starting the first scan electrode that is sequentially excited by the scan electrode drive pulse DV from, for example, the scan electrode corresponding to the scan voltage G3, it is possible to set the upper limit display position of the one-image display panel 2. be.

Further, the above-mentioned horizontal and vertical enlargement/reduction functions may be provided independently, or may be combined. Furthermore, it is also possible to configure the drive pulse generation circuit 8 and the display function setting circuit 9 using a microcomputer or the like.

FIG. 21 shows a signal electrode drive circuit 3 and a scan electrode drive circuit 4.
．． Another embodiment of the drive pulse generation circuit 8 will be shown. In this embodiment, the display position of an enlarged or reduced image displayed on the single-image display panel 2 can be freely set. As shown in the figure, the signal electrode drive circuit 3 includes a counter 51, a decoder 52, and a group of electronic switches 53. Further, the scan electrode drive circuit 4 includes a shift register 54 and a latch circuit 55. Note that a buffer circuit may be connected to the output of the latch circuit 55 in order to amplify the scanning voltage as necessary. Further, the drive pulse generation circuit 8 is a signal electrode drive pulse generation circuit 8.
a, and a scan electrode drive pulse generation circuit 8b.

The counter 51 receives the signal electrode drive pulse CLKH and a display position command XO8 indicating the left limit position of the display image. The counter 51 is a presettable counter, and the recorder 52 performs basic operations as shown in FIG. That is, the signal C○ input from the counter 51
In response to ~CH, a signal of T1-(pm is generated.Then, the counter 51 is operated manually by Xo
By outputting signals CO to CH according to S, a drive signal is output from an arbitrary ψj. For example, if xos=o indicates the left end.

A signal Co-CH as shown in FIG. 22 is output and excited sequentially from T1.

On the other hand, the scan electrode drive pulse generation circuit 8b receives te, tk, a magnification E, and a reduction rate 1/1 given from the display function setting circuit 9.
Figures 17 and 18 based on R.

Scanning electrode drive pulse DV as shown in Figures 19 and 20
is generated and output to the scan electrode drive circuit 4. Further, based on a command YO8 indicating the upper limit position of the display target image given from the display function setting circuit 9, drive pulses are outputted to sequentially excite the corresponding scanning voltage Gi. For example, yos indicating the top edge
=o, as shown in Figure 23, the vertical synchronization signal 5YN
DVI, DV2, etc. are output in synchronization with V, and excited sequentially from G1. A shift register 54 and a latch circuit 55 to which the scan electrode drive pulse DV formed in this manner is input.
The basic operation will be explained using FIG. 23. As shown in the figure, the scanning electrode drive pulse DV is input as pulse signals DVI, DV2, . . . at a period of one frame. This signal is applied to the shift register 54 by scanning clock pulse CL.
It is taken in at the timing of KV. In other words, the shift register 31 has a function of converting the scanning electrode drive pulse DV of the serial signal into parallel signals. Then, a scan electrode drive pulse DV (in the figure, DV
After I) is incorporated.

The signal is taken into the latch circuit 55 at the timing of the vertical synchronization signal 5YNH. In the next frame, the DV2 signal is captured and output from the latch circuit 55. As a result, the latch circuit 55 generates phase-shifted scanning voltages Gl, G2 . ... will occur.

FIG. 24 shows still another embodiment of the present invention, in which the structure of the signal electrode drive circuit 3 is different from the embodiment described above. As shown in the same figure.

The signal electrode drive pulse CLKH and horizontal synchronization signal 5YNH output from the drive pulse generation circuit 8 are input to the block selection voltage generation circuit 101.

In addition, the scanning electrode drive pulse DV and the vertical synchronization signal 5YNV
is input to the scan electrode drive circuit 4.

The image signal DATA is input to a data generation circuit 102 that performs direct value conversion. Drive signals r'1, (P'2... output from the block selection voltage generation circuit 101 are applied to the gates of a plurality of switch elements 102, respectively. It is connected between a data line 103 and a plurality of line memories 104. That is, a divided matrix switch circuit is formed in which switch elements 102 are formed in a matrix on a plurality of data lines 103 and a plurality of gate electrode groups. The image signal input to the divided matrix switch circuit formed in this way is stored in the line memory 104.The contents of the line memory 104 are taken into the voltage conversion circuit 105.

The voltage conversion circuit 105 amplifies and/or inverts the signal voltage output from the line memory 104 for AC excitation, and converts it into a voltage for driving the display cell 23 of one pixel. In addition.

In the illustrated example, six switch elements 102 are divided into one block, but the invention is not limited to this, and the number of switch elements 102 may be increased or decreased as necessary. . Further, reference numeral 106 in the figure indicates a power supply circuit. Furthermore, it goes without saying that each component shown in FIG. 24 can be formed on the same glass substrate.

FIG. 25 shows an operational waveform diagram of the main parts of the embodiment shown in FIG. 24. In the figure, the image signal DATA has multiple data lines 103.
The voltage waveform of one of the voltages applied to is shown. The scanning voltages Gl, G2... are applied from the scanning electrode drive circuit 4 to the scanning electrode 6.
This is the voltage waveform applied to the ψ' 1. ? '2. '
l"3.?' k is block selection voltage generation circuit 101
This is the waveform of the block selection voltage output from. When the block selection voltage r'1 is applied to the gate of the switch element 102 (six switch elements in the illustrated example) of the first block, the switch element of that block is turned on, and the plurality of switch elements connected to it are turned on. An image signal DATA is taken into the line memory 104 from the data line 103 of each. Such an operation is performed as ψ'2. 'P' 3...? '
By repeating the process up to k, all the horizontal one-line image signals are captured in the line memory 104 and transferred to the signal electrodes 5 of the image display panel 2 via the voltage conversion circuit 105.
is output to.

Next, the horizontal image enlarging operation in the embodiment shown in FIG. 24 will be explained based on the timing chart shown in FIG. 26. Each block selection voltage ? with respect to the repetition period AO of the normal block selection voltage T' shown in FIG. '
The pulse length of 1 to lk is shortened from that shown by the dotted line to that shown by the solid line, so that the repetition period falls within the range of A1. As a result, the range of the image signal DATA displayed by the same pixel 21 is narrowed from AO to A1. If this is viewed on the image display panel 2, the image will be enlarged and displayed. The magnification at this time is 80/AI. This block selection voltage? The pulse width '1 to ψ' and its generation timing are controlled by the signal electrode drive pulse CLKH generated by the drive pulse generation circuit 8 and the horizontal synchronization signal 5YNH, as in the embodiment described above.

In contrast to FIG. 26, FIG. 27 shows a case where the pulse width of a part of the professional selection voltage T' is widened, and according to this, the displayed image is reduced.

As described above, even in the case where the image display panel 2 is driven by the block selection voltage T' as in this embodiment, the pulse width of the block selection voltage T' can be expanded, reduced, or
By changing the application timing, etc., the target image can be freely enlarged or reduced in any part of the original image. Furthermore, by reversing the order in which T' is applied, it is also possible to reverse the displayed image horizontally.

Next, vertical enlargement and reduction will be explained using the embodiment shown in FIG.

FIG. 28 shows a method of driving the scanning electrodes in a basic state in which one display image is not enlarged or reduced. That is, as shown in the timing indicated by the broken line, in accordance with the image signal DATA for one line.

Scanning voltages Gl, G2, . . . are generated sequentially for each line.

When enlarging, as described above, as shown in FIG. 29, by scanning adjacent E scanning electrodes (E=2 in the illustrated example) with the same drive pulse, The same signal voltage will be applied to the display cells connected to the electrodes. For example, the image signal DATA of the same IH image is applied to the display cells of the first and second rows, and the third
A 2H image signal DATA is applied to the row and the fourth row, and the displayed image is enlarged twice.

When reducing the width, as described above, the width of the scanning electrode perturbation pulse is multiplied by R (R=2 in the illustrated example)
), and according to this, a display image with a reduction ratio of 1/R can be obtained.

Note that at this time, the LH and 2H image signals DATA are continuously applied to the first row scanning electrode, but the display cell 23
Since the content of is rewritten by the 2H image signal DATA, the display cell 23 connected to the first row scanning electrode will eventually display the 2H content. Similarly, the second
The display cell 23 corresponding to the scanning electrode in the row displays the contents of 4A.

In this way, the displayed image is reduced by 1/2.

Further, a modification of FIG. 30 is shown in FIG. 31, that is,
The scanning voltage G1 is adjusted to correspond to the image signal actually displayed.
．． This is a reduced width of G2.

According to this, the IH image is on the first line and 3 on the second line.
The image H is displayed and reduced in size as in the case of FIG. 30.

Next, so-called multi-display in which a plurality of images are displayed on the image display panel 2 will be explained. FIG. 32 shows the drive waveform of the scanning electrode when two or more display images are displayed on one display screen using the display image reduction method shown in FIGS. 30 and 31. . In this case, two different types of image signals DATA1 and DATA2 are input, DATAI in the first half of scanning and DAT in the second half.
The display panel 2 is driven by A2. That is, if the first to i-th rows of the n scanning electrodes 6 are driven by DATAI, and the i-th to nth rows are driven by the image signal of DATA2, each area will be An image reduced by 172 in the vertical direction will be displayed.

Also, using the horizontal reduction method explained in FIG.
In the 1-line image signal IH, the image signal ta is set from 1 to 2.
By switching to , horizontal reduction and multi-image display can be realized.

Furthermore, the pulse widths of the clock selection voltage T' and the scanning voltage G are made three times or more, thereby reducing the display image reduction rate to 1/1.
By setting it to 3 or less, 3
It is also possible to display X3=9 or more images. According to this, in order to display multiple screens conventionally, a frame memory, etc. was required, but according to the present invention, image processing such as enlargement, reduction, and multi-display can be easily performed without using a frame memory. It can be done.

Next, FIGS. 33 to 36 show applied embodiments of a video device and the like incorporating the image display device according to the present invention.

What is shown in FIG. 33 is one embodiment of a slide projector. In the figure, reference numeral 200 is a slide projector main body, and reference numeral 201 is an image display device according to the present invention, which is a TFTLCD (Thin Film Transis).
tor Liquid Crystal Dispal
ay). According to this, T.F.
The image on the TLCD 201 is enlarged through the slide projector main body 200 and projected onto the screen 203. At this time, the image projected on the screen 203 can be freely enlarged or reduced by scanning the display function setting circuit built into the TFTLCD 201.
It can be rotated, moved, etc.

FIG. 34 shows an embodiment in which an image display device according to the present invention is incorporated into a video camera. In the figure, reference numeral 204 is a video camera body, and reference numeral 205 is a viewfinder constructed from the above-mentioned TFTLCD. According to this, image information captured by the video camera body 204 can be displayed on the viewfinder 205. According to this, an image captured by the video camera body 204 is captured by scanning the display function setting circuit of the viewfinder 205.

It can be displayed on the viewfinder 205 by enlarging or reducing it by one rotation and by moving it.

FIG. 35 shows an embodiment of a wall-mounted television incorporating an image display device according to the present invention. The TV body 2o7 is on the wall 20
6, and the display section 2 of the TV main body 207
08 is composed of a TFTLCD according to the present invention.

In the figure, reference numeral 209 is a control unit incorporating a power switch, volume control, channel selection switch, etc., and reference numeral 210 is a control unit incorporating a
This is a hanging string for hanging the television main body 207 from the 06. According to this configuration, like a conventional CRT television, the display section 209 can be controlled by operating the control section 209 of the television main body 207 directly or with a remote control.
Images can be displayed on 8. Here, since the display section 208 is formed of a TFTLCD as described above, by controlling the control section 209 including the display function setting circuit described above, the displayed image on the display section 208 can be enlarged, reduced, rotated, and moved. , it can be displayed on a parent-child screen, etc.

FIG. 36 shows an example of the configuration of a video card (disk book) incorporating the image display device according to the present invention. The video card main body 211 is a TF according to the present invention.
It has a display section 212 configured with a TLCD, and a control section 21
By scanning 3, the contents recorded on the video cassette 214 can be displayed on the display section 212. The control unit 213 includes a power switch for the video card, a switch to switch to the next page, a cue switch that can directly display the contents of any page,
The book includes a fast forward switch, a rewind switch, an auto changeover switch that allows you to turn pages one after another at any time, and an automatic buzz switch that wakes up people who fall asleep while reading. According to this, 1. For example, a video cassette 214 on which the contents of a book are recorded is inserted into the main body 211.
By inserting the book into the book and scanning the control section 213, the contents of the book can be displayed on the display section 212.

A TFTLC provided in connection with the control unit 213
1 display section 2 by controlling the display function setting circuit of D.
The content of the book displayed on 12 can be enlarged, reduced, rotated, moved, etc. and displayed.

FIGS. 37 and 38 show specific examples of the image signal generation circuit 10 described in FIG. 1. FIG. 37 shows an example in which the television signal receiving circuit 10a is connected to the image display device 1 according to the present invention. As shown in the figure, the television signal receiving circuit 10a is
Antenna 300, selection circuit 3o1. Detection circuit 302, audio circuit 303, video circuit 304, color signal processing circuit 305
, a synchronization circuit 306, and the image signal DATA is transmitted from the color signal processing circuit 305 to the synchronization circuit 30.
6 to horizontal synchronization signal 5YNH, vertical synchronization signal 5YNV,
A timing signal To including a scanning clock pulse CLKV is input to each image display device 1 . According to this, by scanning the display function setting circuit of the image display device 1.

The received television image can be freely enlarged or reduced.

FIG. 38 shows an example in which an information processing circuit 10b such as a word processor or a personal computer is connected to the image display bag M1 according to the present invention. The information processing circuit 10b.

Arithmetic processing circuit 310, printer 311, image memory 31
2. Memory control circuit 313, input/output circuit 314
It is composed of: Then, an image signal DATA is input from the image memory, and a timing signal To similar to the above is input from the memory control circuit 313 to the image display device 1. According to this, similarly to FIG. 37 above, it is possible to display images of a word processor or the like by enlarging or reducing them on the image display device 1 itself.

〔Effect of the invention〕

As explained above, according to the present invention, the signal electrode is driven in accordance with the signal electrode drive pulse having an arbitrarily set period in synchronization with the input horizontal synchronizing signal, so that the period By making it shorter, the original image can be enlarged and displayed, and by making it longer, the original image can be displayed in a smaller size. Moreover, since the period can be continuously increased or decreased, an arbitrary enlargement or reduction ratio can be obtained.

In addition, in synchronization with the vertical synchronization signal to be inputted, a pulse width of R times approximately equal to the period of the inputted scanning clock pulse or arbitrarily set is applied for each bundle of E adjacent scanning electrodes. Since the scanning electrode is driven by a scanning electrode drive pulse having a period R times R, which is arbitrarily set, by setting E and R appropriately, the displayed image in the vertical direction can be changed. It can be displayed at an enlargement or reduction ratio of E/R times. Furthermore, by appropriately setting E and R, any magnification or reduction ratio can be obtained.

By combining these, the entire image can be easily enlarged or reduced.

Furthermore, the present invention can be applied to all image signal generation devices that generate one image signal and a synchronization signal, and can be highly versatile.

[Brief explanation of the drawing]

FIG. 1 is an overall block configuration diagram of an image display device according to an embodiment of the present invention, FIG. 2 is a partial detailed diagram of the image display panel of the embodiment shown in FIG. 1, and FIG. 3 is a concrete implementation of the image display panel 2. 4 to 6 are diagrams illustrating the operation of the third figure image display panel, and FIG. 7 is a diagram showing a specific configuration example centered on the signal electrode drive circuit of the embodiment in FIG. 1. 8 is a diagram showing a modification of the signal electrode drive circuit shown in FIG. 7, FIG. 9 is a timing chart showing operation waveforms of each part of the embodiment in FIG. 7, and FIG. 10 is a diagram showing the signal electrode drive circuit in FIG. 7. A configuration diagram showing another modification of the drive circuit, FIG. 11 is a timing chart explaining the operation of FIG. 10, and FIG. 12 is a diagram explaining the basic concept of horizontal expansion and reduction according to the embodiment in FIG. 1. , Figure 13 is the first
2 is a timing chart showing specific operation waveforms of each part, FIG. 14 is a diagram showing a specific configuration example of a signal electrode drive pulse generation circuit and a related display function setting circuit, and FIG. FIG. 16 is a diagram explaining the timing relationship between the horizontal synchronization signal, image signal, and vertical synchronization signal, and FIGS. FIG. 19 is a timing chart showing the signal waveforms of each part related to enlargement. FIG. 19 is a timing chart showing the operation waveforms of each part related to vertical reduction. FIG. 21 is a block diagram of main parts of another embodiment of the present invention, and FIGS. 22 and 23 are timing charts shown in FIG.
21 is a timing chart of operation waveforms of each part related to the basic operation of the embodiment, FIG. 24 is a block diagram of main parts of still another embodiment of the present invention, and FIG. 25 is a basic operation of the embodiment of FIG. 24. 26 is a timing chart showing the operating waveforms of each part related to horizontal enlargement display in the embodiment shown in Fig. 24, and Fig. 27 is a timing chart showing the operating waveforms of each part related to horizontal reduction in the embodiment shown in Fig. 24. 28 is a timing chart, and FIG. 24 is an operation waveform diagram of each part explaining the vertical scanning electrode drive of the embodiment, and FIGS. 29 to 31.
24 is a timing chart of operation waveforms of each part related to vertical enlargement and reduction of the embodiment, FIG. 32 is a timing chart of operation waveforms of each part related to multi-display, and 3.
3 to 36 are block diagrams showing embodiments of various video devices to which the image display device of the present invention is applied, and FIGS. 37 and 3
FIG. 8 is a diagram showing an example of the configuration of an image signal generation device to which the present invention is applicable. 1... Image display device, 2... Image display panel. 3... Signal electrode drive circuit, 4... Scanning electrode drive circuit, 5... Signal electrode, 6... Scanning electrode, 8... Drive pulse generation circuit, 8a
...Signal electrode drive pulse generation circuit, 8b...Scanning electrode drive pulse generation circuit, 9...Display function setting circuit, 21...Pixel, 22...TFT, 23...Display cell, 24...Opposing common electrode, 31...Shift register, 32... Electronic switch group. 41... Unstable multivibrator, 42.43... Monostable multivibrator, 51... Counter, 52... Decoder, 53... Electronic switch group, 54... Shift register, 55... Latch circuit, 101... Block selection voltage generation circuit, 102... Switch element, 103...data line. 104... Line memory, l O... Voltage conversion circuit, 1
06...Power supply circuit, 107...Data generation circuit.

Claims (1)

[Claims] 1. A display panel in which a plurality of scanning electrodes and a plurality of signal electrodes are arranged in a matrix and a display cell is connected to each intersection of the electrodes, the signal electrodes being arranged in response to an image signal. An image display device comprising: a signal electrode drive means for sequentially exciting the scan electrodes with a signal voltage; and a scan electrode drive means for sequentially exciting the scan electrodes; A driving method for an image display device in which the display cell is driven by the signal electrode driving means and the scanning electrode driving means based on a pulse, the method having an arbitrarily set period in synchronization with input horizontal synchronization. The signal electrode drive means is driven in accordance with the signal electrode drive pulse, and in synchronization with the input vertical synchronization signal, each bundle of one or more adjacent scan electrodes is driven at a period approximately equal to the period of the input scan clock pulse. An image display device characterized in that the scanning electrode driving means is driven in accordance with a scanning electrode driving pulse having a pulse width that is equal to or an integral multiple of an arbitrarily set value, and a period that is an integral multiple of an arbitrarily set pulse width. Driving method. 2. A display panel in which a plurality of scanning electrodes and a plurality of signal electrodes are arranged in a matrix and a display cell is connected to each intersection of the electrodes, and the signal electrodes are configured to convert the signal electrodes into image signals according to input signal electrode drive pulses. a signal electrode drive means that sequentially excites the scan electrodes with corresponding signal voltages; a scan electrode drive means that sequentially excites the scan electrodes according to input scan electrode drive pulses; a signal electrode drive pulse generating means for generating the signal electrode drive pulse having a period of 1, and a signal electrode drive pulse generating means that generates the signal electrode drive pulse with a period of
A scan electrode drive pulse that generates the scan electrode drive pulse, which has a pulse width that substantially matches the cycle of the input scan clock pulse or is an arbitrarily set integer multiple, and has a cycle that is an arbitrarily set integer multiple. An image display device comprising: a generating means; 3. The image display device according to claim 2, wherein the signal electrode drive pulse is output after a variably set time has elapsed from the horizontal synchronization signal. 4. Claim 2, wherein the signal electrode drive pulse has a fixed number of pulses that are variably set.
The image display device described. 5. The image display device according to claim 2, wherein the signal electrode driving means sequentially starts excitation from arbitrary signal electrodes that are variably set. 6. The image display device according to claim 2, wherein the scanning electrode drive pulse is output after a variably set time has elapsed from the vertical synchronization signal. 7. Claim 2, wherein the scanning electrode drive pulse has a constant number of pulses that is variably set.
The image display device described. 8. The image display device according to claim 2, wherein the scanning electrode driving means sequentially starts excitation from arbitrary scanning electrodes that are variably set. 9. A display panel in which a plurality of scanning electrodes and a plurality of signal electrodes are arranged in a matrix and a display cell is connected to each intersection of the electrodes, and the signal electrodes are configured to convert the signal electrodes into image signals according to input signal electrode drive pulses. a signal electrode drive means that sequentially excites the scan electrodes with corresponding signal voltages; a scan electrode drive means that sequentially excites the scan electrodes according to input scan electrode drive pulses; The signal electrode drive pulse having a period and number of pulses is synchronized with the input vertical synchronization signal by a signal electrode drive pulse generating means that generates the signal electrode drive pulse after a predetermined time arbitrarily set from the horizontal synchronization signal, Adjacent E (E
R (R = 1, 2, 3, . . . ) is approximately equal to the period of the input scanning clock pulse, or is arbitrarily set, corresponding to each bundle of scanning electrodes (R = 1, 2, 3, . . . ). ) times the pulse width and arbitrarily set R (R=1, 2, 3...
), the scan electrode drive pulse generating means generates the scan electrode drive pulse having a period twice as long as the period and a variably set constant number of pulses after a variably set time has elapsed from the vertical synchronization signal. , the signal electrode drive means is configured to sequentially start excitation from any variably set signal electrode, and the scan electrode drive unit is configured to sequentially start excitation from any variably set scan electrode. Image display device.