JP2008165052A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device that prevents pixels from decreasing in numerical aperture and has enhanced effect on power saving of a liquid crystal panel by image storage. <P>SOLUTION: A memory 14 is provided in an area 11' other than a display area 11 and then the pixels are simplified and prevented from decreasing in numerical aperture. Further, a control circuit 15 displays a transmitted small image, stores the small image in the memory 14, and displays the stored small image again to make power consumption less than that when the same small image is displayed each time it is transmitted. Furthermore, the power consumption is made less than that for a large image because of the small image. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device in which reduction in aperture ratio of a pixel is prevented and power saving effect is increased by image storage in a liquid crystal panel.

  FIG. 13 is a diagram illustrating a schematic configuration and a display state of a conventional liquid crystal display device. FIG. 14 is a timing chart for the display of FIG.

  Conventionally, for example, an operation is performed every frame period of about 1/60 seconds. In the operation, first, the control circuit 22 of the external circuit 2 transmits the image in the memory 21 to the liquid crystal panel 100 by the data signal and the control signal. In the liquid crystal panel 100, the video signal converted from the image by the signal circuit 12 is applied to the signal line, and the image is displayed in the display area 11 by the functions of the signal circuit 12 and the scanning circuit 13. For example, when displaying date and time on a mobile communication terminal, the same image is repeatedly transmitted and displayed so that the date and time appear to be stationary.

On the other hand, Patent Document 1 discloses a configuration for storing an image in a liquid crystal panel. As a result, the number of transmissions can be reduced, and the power consumption of the external circuit can be reduced.
Japanese Patent Laid-Open No. 2002-311922

  However, in the configuration of Patent Document 1, since an image is stored in the pixels in the display area, the aperture ratio of the pixels decreases due to the presence of a storage transistor or the like.

  In addition, in the display of date and time, the only part that needs to be displayed is the date and the like. However, since the image of the size of the display area must be transmitted and displayed, there is little power saving effect. .

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid crystal display device that is intended to prevent reduction in the aperture ratio of pixels and increase power saving effect by storing images in a liquid crystal panel. Is to provide.

  In order to solve the above-described problems, in the first aspect of the present invention, in a liquid crystal display device in which an image is transmitted and displayed on a liquid crystal panel having a display area in which an image is displayed, the liquid crystal panel includes the liquid crystal panel. Provided in an area excluding the display area, in which a small image smaller than the large image of the display area is transmitted is stored, and in the area excluding the display area of the liquid crystal panel And a control circuit configured to display the small image in the display area, store the small image in the memory, and display the stored small image again.

  According to the present invention, by providing a memory in a region other than the display region, the pixel is simplified and a decrease in aperture ratio can be prevented. In addition, according to the present invention, the transmitted small image is displayed, stored, and the stored small image is displayed again, so that the power consumption is lower than when the same small image is displayed each time it is transmitted. Can do. Further, according to the present invention, since the image is a small image, the power consumption can be reduced as compared with the case of a large image.

  In the second aspect of the present invention, the control circuit changes a position where the display is performed in the display of the small image.

  According to the present invention, the display position can be changed, for example, every second.

  In the third aspect of the present invention, the control circuit displays a part of the small image when displaying the small image, and the part of the small image is at a position different from a position where the part is displayed. The part except for is displayed.

  According to the present invention, there is no need to provide a memory for storing the part and a memory for storing the excluded part.

  In a fourth aspect of the present invention, the control circuit displays a uniform image in a region excluding a region at a position where a small image in the display region is displayed.

  According to the present invention, it is not necessary to prepare a large image consisting of a small image and a uniform image one by one.

  In a fifth aspect of the present invention, the control circuit displays a uniform image in the display area, and displays the small image in the display area where the uniform image is displayed.

  According to the present invention, a uniform image can be displayed regardless of the position where the small image is displayed.

  In a sixth aspect of the present invention, there is provided a second memory which is provided in an area excluding the display area of the liquid crystal panel and stores a small image smaller than the large image, and the control circuit is stored in the memory. The small image stored in the second memory is displayed at a position different from the position where the small image is displayed, the small image is stored in the second memory, and the stored small image is again displayed. It is characterized by displaying.

  According to the present invention, two small images can be displayed.

  In the seventh aspect of the present invention, the element constituting the small image stored in the memory is 3 bits, and 1 bit of the 3 bits indicates the presence or absence of red coloring at the position of the element, and the remaining 2 bits. One of the bits is set to indicate the presence / absence of green coloring at the position of the element, and the remaining one bit is set to indicate the presence / absence of blue coloring at the position of the element.

  According to the present invention, a small color image can be displayed.

  In an eighth aspect of the present invention, an element constituting a small image stored in the memory is 1 bit, and the 1 bit is set so as to indicate white or black coloring at the position of the element. .

  According to the present invention, a monochrome small image can be displayed.

  In a ninth aspect of the present invention, the liquid crystal panel includes a substrate made of a glass material and a polysilicon film formed on the substrate by a low-temperature process, and the memory is composed of a thin film transistor made of the polysilicon film. It is characterized by that.

  According to the present invention, the memory can be configured as a liquid crystal panel made of a glass material by configuring the memory with a thin film transistor formed of a polysilicon film generated by a low temperature process.

  In a tenth aspect of the present invention, the liquid crystal panel is configured such that the small image is displayed by reflecting external light incident on the liquid crystal panel in the liquid crystal panel. To do.

  According to the present invention, a backlight can be eliminated by displaying a small image with external light.

  According to the present invention, by providing a memory in a region other than the display region, the pixel is simplified and a decrease in aperture ratio can be prevented. In addition, according to the present invention, the transmitted small image is displayed, stored, and the stored small image is displayed again, so that the power consumption is lower than when the same small image is displayed each time it is transmitted. Can do. Further, according to the present invention, since the image is a small image, the power consumption can be reduced as compared with the case of a large image.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a schematic configuration and a display state of the liquid crystal display device according to the first embodiment.

  This liquid crystal display device relates to an example mounted on a mobile communication terminal, and includes a liquid crystal panel 1 on which an image is displayed. In this example, an external circuit 2 that transmits an image to the liquid crystal panel 1 is used. There is a case where a backlight (not shown in the figure, other elements are also omitted in the illustration) is disposed on the back surface of the liquid crystal panel 1.

  The liquid crystal panel 1 drives a display area 11 on which an image is displayed, a signal circuit 12 that supplies a video signal to a plurality of signal lines formed in the display area 11, and a plurality of scanning lines formed in the display area 11. A scanning circuit 13 and a memory 14 and a control circuit 15 provided in an area 11 ′ excluding the display area 11 are provided. The memory 14 is, for example, a static memory that does not require a refresh operation. The liquid crystal panel 1 may include a circuit that performs electrostatic protection.

  In the liquid crystal panel 1, a liquid crystal layer is sandwiched between an array substrate including a substrate made of a glass material and a polysilicon film formed on the substrate by a low temperature process, and a counter substrate facing the array substrate.

  In the array substrate, the signal lines and the scanning lines are arranged in a grid pattern. At each intersection of the signal line and the scanning line, a thin film transistor and a pixel electrode made of a polysilicon film are formed. At the intersection, the source electrode of the thin film transistor is connected to the signal line, the gate electrode is connected to the scanning line, and the drain electrode is connected to the pixel electrode. The signal circuit 12, the scanning circuit 13, the memory 14, and the control circuit 15 are composed of thin film transistors made of the same polysilicon film. The pixel electrode is formed of a light transmissive conductive member such as ITO (Indium Tin Oxide), and thus transmits light from the backlight. The pixel electrode includes, for example, a metal portion, and thus reflects external light.

  In the counter substrate, a counter electrode is formed in the display region 11. The counter electrode is formed of a similar light-transmissive conductive member, and thus transmits light from the backlight, external light, reflected light, and the like.

  In the liquid crystal panel 1, a portion corresponding to each pixel electrode is referred to as a pixel. In the liquid crystal panel 1 in the case of performing color display, pixels having red (R), green (G), and blue (B) color layers are included. Arranged regularly.

  The external circuit 2 includes a memory 21 that stores an image displayed in the display area 11 and a control circuit 22 that transmits the image stored in the memory 21 to the liquid crystal panel 1.

(Operation of the first embodiment)
(Large image display)
First, an operation for displaying an image having a size of the display area 11 (referred to as a large image) will be described.

  A large image is stored in the memory 21 as digital data. The control circuit 22 reads a large image from the memory 21 and transmits it to the control circuit 15. The control circuit 15 displays the transmitted large image in the display area 11.

  In this display, first, the control circuit 15 transmits a large image to the signal circuit 12 and starts the operation of the scanning circuit 13.

  The scanning circuit 13 immediately drives the scanning line at one end, whereby the thin film transistor connected to the scanning line becomes conductive. The signal circuit 12 also immediately selects digital data corresponding to the pixel including the thin film transistor from the large image, converts it into an analog video signal, and applies it to the corresponding signal line. The given video signal is written into the pixel electrode through the thin film transistor. In a pixel including this pixel electrode, the light transmittance of the liquid crystal corresponds to the potential difference between the pixel electrode and the counter electrode. In the pixel in which the translucency of the liquid crystal is set in this way, light corresponding to the transmissivity is emitted out of the light from the backlight or the reflected light of the external light. In this way, display is performed with pixels corresponding to the scanning line at one end. Subsequently, the same display is performed at the pixel corresponding to the adjacent scanning line. In this manner, a large image is displayed by sequentially displaying the pixels corresponding to the scanning lines.

  The large image is displayed every frame period divided into several tens of times per second. A still image is displayed by displaying the same large image in each frame period. On the other hand, a moving image is displayed by displaying different large images while exchanging them.

(Small image display)
Next, an operation for displaying an image smaller than a large image (referred to as a small image) will be described. In the following description, an example in which a small image indicates date and time will be added as appropriate.

  A small image is stored in the memory 21 as digital data. The elements constituting the small image are, for example, 3 bits, and 1 bit of the 3 bits indicates the presence or absence of red coloring at the position of the element, and 1 bit of the remaining 2 bits is at the position of the element. The presence / absence of green coloring is indicated and the remaining 1 bit is set to indicate the presence / absence of blue coloring at the position of the element.

  Alternatively, the element constituting the small image is, for example, 1 bit, and the 1 bit is set so as to indicate white or black coloring at the position of the element.

  The control circuit 22 is preset with a counter that is a numerical value indicating the display timing of the small image.

  FIG. 2 is a timing chart for the display of FIG.

  The display of the small image is performed for each frame period similar to the display of the large image by switching from the display mode in which the large image is displayed to the display mode in which the small image is displayed. In the first frame period, first, the control circuit 15 displays a uniform image on the display area 11.

  In this display, first, the control circuit 15 notifies the signal circuit 12 of a uniform image mode preset in itself, and starts the operation of the scanning circuit 13.

  Subsequently, the scanning circuit 13 drives all the scanning lines, whereby all the thin film transistors are turned on. The signal circuit 12 also immediately applies an analog video signal corresponding to the notified form to all signal lines. The supplied video signal is written to all the pixel electrodes through the thin film transistor. In all the pixels, the translucency of the liquid crystal corresponds to the potential difference between the pixel electrode and the counter electrode. Thus, in all the pixels, light corresponding to the transmittance is emitted from the light from the backlight or the reflected light of the outside light. In this way, a uniform image is displayed in the display area 11. That is, a single color is developed with the same luminance.

  In the same frame period, the control circuit 22 reads out the small image from the memory 21 at the timing indicated by the set counter, and transmits it to the control circuit 15 by the data signal and the control signal in FIG. The control circuit 15 immediately stores the transmission timing, stores the small image in the memory 14, and displays it in the display area 11.

  In this display, a small image is transmitted to the signal circuit 12 and notified to the scanning circuit 13.

  The scanning circuit 13 immediately drives the corresponding scanning line at that time, whereby the thin film transistor connected to the scanning line becomes conductive. The signal circuit 12 also immediately selects digital data corresponding to the pixel including the thin film transistor from the small image, converts it into an analog video signal, and applies it to the corresponding signal line. The given video signal is written into the pixel electrode through the thin film transistor. In a pixel including this pixel electrode, the light transmittance of the liquid crystal corresponds to the potential difference between the pixel electrode and the counter electrode. In the pixel in which the translucency of the liquid crystal is set in this way, light corresponding to the transmissivity is emitted out of the light from the backlight or the reflected light of the external light. In this way, display is performed with pixels corresponding to the scanning line. Subsequently, the same display is performed at the pixel corresponding to the adjacent scanning line. A small image is displayed by sequentially displaying the pixels corresponding to the respective scanning lines.

  Next, also in the second frame period, first, similarly, the control circuit 15 displays a uniform image in the display region 11.

  In the same frame period, the control circuit 22 does not read out the small image when a new small image is not stored in the memory 21 even at the timing indicated by the set counter. As a result, the small image is not transmitted to the control circuit 15. The control circuit 15 reads out the small image stored in the memory 14 at the stored timing, and similarly displays it in the display area 11.

  In this way, small images are continuously displayed. The display of the small image ends, for example, one second after the start, and the new small image is stored in the memory 21 so that the display of the new small image at the same position is started.

  Note that the display of the small image ends when the display mode is switched to the large image display mode.

  FIG. 3 is a diagram illustrating a state in which a small image is displayed at a position different from the position in FIG. FIG. 4 is a timing chart for the display of FIG.

  In the control circuit 22, a counter different from the counter for displaying a small image at the position shown in FIG. 1 is set. Therefore, the control circuit 22 transmits the small image to the control circuit 15 at a timing different from the timing in FIG. As a result, the control circuit 15 displays the small image at a position different from the position in FIG. The details are the same as those described so far.

  By the way, the display of the small image is continued until the next uniform image display timing. Therefore, when the time to the timing is short, the small image is difficult to be visually recognized.

  Therefore, as shown in FIG. 5, for example, immediately before the display timing of the small image, the display timing of the uniform image is notified to the control circuit 15 by the control signal, and the control circuit 15 displays the uniform image at the display timing. It is good to do.

  Further, this may be performed without using a control signal. For example, the control circuit 15 may obtain the uniform image display timing based on the small image display timing, and display the uniform image at the display timing.

  By extending the duration of the small image display in this way, the small image can be easily viewed. Further, uniform image display that does not depend on the control signal contributes to power saving of the liquid crystal panel 1 as compared with that based on the control signal.

  Further, the duration of the small image display is shortened because uniform image display is performed on the entire display area 11, and as shown in FIG. 6, for example, before and after the small image display timing, A uniform image may be displayed in an area excluding the display area. This uniform image mode may be stored in advance by the control circuit 15 in the same manner as when uniform image display is performed on the entire display area 11.

  FIG. 7 is a diagram illustrating a state in which a plurality of small images are displayed with their positions and timings changed.

  When displaying as in FIG. 7, the small image G <b> 1 is stored in the memory 21. In the control circuit 22, a counter C1 (not shown) for displaying the small image G1 is set in the control circuit 15. The counter described below is also the same, and is not shown in the figure.

  By setting the counter C1, the small image G1 is displayed at a position corresponding to the counter C1. The display of the small image G1 starts, for example, at 10:10:34 on October 01 (Monday) and ends after one second.

  Further, the small image G2 is stored in the memory 21. The control circuit 22 is set with a counter C2 for displaying the small image G2. Thereby, the small image G2 is displayed at a position corresponding to the counter C2. The display of the small image G2 starts, for example, at 10:10:35 on October 01 (Monday) and ends after 1 second.

  In addition, the small image G3 is stored in the memory 21. The control circuit 22 is set with a counter C3 for displaying the small image G3. Thereby, the small image G3 is displayed at a position corresponding to the counter C3. The display of the small image G3 starts, for example, at 10:10:36 on October 01 (Monday) and ends after 1 second.

  The details are the same as those described so far.

  FIG. 8 is a diagram illustrating a state in which the character string “incoming call” is displayed by scrolling from right to left.

  When displayed as shown in FIG. 8, a small image when the character “arrival” appears to the right, a small image when the character “ri” disappears to the left, and a plurality of small images that interpolate between the small images are generated. . Then, a small image when the character “arrival” appears on the right, a plurality of small images to be interpolated, and a small image when the character “ri” disappears to the left are displayed while being replaced in this order. Is displayed.

  The details are the same as those described so far.

[Second Embodiment]
FIG. 9 is a diagram illustrating a state in the liquid crystal display device according to the second embodiment.

  Since the liquid crystal display device is configured in the same manner as that of the first embodiment, the operation will be described here. Since the display of the large image is the same as that in the first embodiment, the display of the small image will be described here.

  In the second embodiment, the parts constituting the small image are displayed with their positions changed.

  FIG. 10 is a timing chart for the display of FIG.

  In the case of displaying as shown in FIG. 9, the memory 21 stores portions G11 and G12 constituting a small image. That is, the portion G12 is a portion excluding the small image portion G11. Further, the control circuit 22 is set with a counter C11 for displaying the portion G11. Thereby, the part G11 is displayed at a position corresponding to the counter C11. The display of the portion G11 is started, for example, when the small image display mode is switched, and is ended when the large image display mode is switched. At the end of the day or at midnight of the day, a new display at the same position is made.

  Further, the control circuit 22 is set with a counter C12 for displaying the portion G12. Thereby, the part G12 is displayed at a position corresponding to the counter C12. The display of the part G12 starts, for example, in a frame period in which the first display of the part G11 is performed, and ends after one second, and a new display at the same position is performed.

  The details are the same as those described so far.

  For example, uniform image display timings may be set in the same manner so that each part can be easily viewed. Further, a uniform image may be displayed in an area excluding the display area of each part.

[Third Embodiment]
FIG. 11 is a diagram illustrating a schematic configuration and a display state of a liquid crystal display device according to the third embodiment.

  Here, a memory 14 ′ (for example, a static memory) is further provided in the region 11 ′ with respect to the first embodiment. And it is comprised so that the small image memorize | stored in memory 14 'may be displayed on the area | region except the area | region where the display of the small image memorize | stored in the memory 14 is made.

(Operation of the third embodiment)
Since the display of the large image is the same as that in the first embodiment, the display of the small image will be described.

  Here, two small images are stored in the memory 21.

  FIG. 12 is a timing chart for the display of FIG.

  The small image is displayed for each frame period by switching to the small image display mode.

  In the first frame period, the control circuit 22 reads one small image from the memory 21 and transmits it to the control circuit 15 by the data signal and the control signal of FIG. The control circuit 15 immediately stores the small image in the memory 14 and displays it in the display area 11.

  When the transmission of one small image is completed, the control circuit 22 reads the other small image from the memory 21 and transmits it to the control circuit 15 by the data signal and the control signal in FIG. The control circuit 15 immediately stores the small image in the memory 14 ′ and displays it in the display area 11.

  Subsequently, the control circuit 15 immediately reads out the small image stored in the memory 14 ′ and displays it on the display area 11. By displaying immediately, this small image is displayed next to the small image displayed immediately before.

  By repeating the display of the small image in the memory 14 ′, the display on the display area 11 is not left.

  Next, in the second frame period, when a new small image is not stored in the memory 21, the control circuit 22 does not read out the small image. As a result, the small image is not transmitted to the control circuit 15. During this frame period, the control circuit 15 immediately reads out the small image stored in the memory 14 and displays it in the display area 11.

  Subsequently, the control circuit 15 immediately reads out the small image stored in the memory 14 ′ and displays it on the display area 11. This small image is displayed next to the immediately preceding small image.

  By repeating the display of the small image in the memory 14 ′, the display on the display area 11 is not left.

  And the display to the display area 11 will be made continuously. The display on the display area 11 ends, for example, after 1 second from the start. Then, a new small image replacing the small image stored in the memory 14 is stored in the memory 21, whereby a new display on the display area 11 including the display of the small image is started.

  Note that the display on the display area 11 including the display of the small image ends when the display mode is switched to the large image display mode.

  As described above, according to the liquid crystal display device according to the present invention, as described with reference to FIGS. 1 and 2, since the memory 14 is provided in the region 11 ′ excluding the display region 11, This simplifies and prevents the aperture ratio from being lowered. In addition, the control circuit 15 displays the transmitted small image, stores it in the memory 14, and displays the stored small image again, thereby reducing power consumption compared to displaying the same small image each time it is transmitted. Can be lowered. Moreover, since it is a small image, power consumption can be made lower than in the case of a large image.

  Further, as described with reference to FIG. 7, the control circuit 15 may change the position where the display is performed by changing the position where the small image is displayed, for example, every second. it can.

  In addition, as described with reference to FIGS. 9 and 10, the control circuit 15 displays the part G11 that is a part of the small image, and the position is different from the position where the part is displayed. By displaying the part G12 excluding the part, it is not necessary to provide a memory for storing the part and a memory for storing the part.

  In addition, since the control circuit 15 displays a uniform image in a region excluding the region where the small image is displayed, it is not necessary to prepare a large image composed of the small image and the uniform image one by one.

  In particular, the control circuit 15 displays a uniform image in the display area 11 and displays a small image in the display area 11 where the uniform image is displayed, so that the uniform image is displayed regardless of the position where the small image is displayed. A simple image can be displayed.

  Further, as described with reference to FIGS. 11 and 12, the second memory 14 ′ is provided in the area 11 ′ excluding the display area 11, and the control circuit 15 displays the small image stored in the memory 14. Two small images are displayed by displaying a small image in the memory 14 ′ at a position different from the position to be made, storing the small image in the memory 14 ′, and displaying the stored small image again. be able to.

  In addition, by repeatedly displaying the small images in the memory 14 ', the display in the display area 11 is not left so that the display of the uniform image displayed in the first embodiment is unnecessary. can do. It should be noted that it is possible to display all the small images in the memory 14 so as not to remain in the display area 11.

  The element constituting the small image stored in the memory 14 is 3 bits, and 1 bit of the 3 bits indicates the presence or absence of red coloring at the position of the element, and 1 bit of the remaining 2 bits is A small color image can be displayed by setting the remaining 1 bit to indicate the presence or absence of green coloring at the position of the element and the presence or absence of blue coloring at the position of the element.

  Further, an element constituting a small image stored in the memory 14 is 1 bit, and the 1 bit is set so as to indicate white or black coloring at the position of the element, thereby displaying a monochrome small image. be able to.

  Further, by configuring the memory with a thin film transistor made of a polysilicon film generated by a low temperature process, the memories 14 and 14 ′ can be configured in the liquid crystal panel 1 made of a glass material.

  Further, since the external light incident on the liquid crystal panel 1 is reflected in the liquid crystal panel 1 to display a small image, a backlight can be eliminated.

It is a figure which shows the schematic structure of the liquid crystal display device which concerns on 1st Embodiment, and the mode of a display. It is a timing chart at the time of the display of FIG. It is a figure which shows a mode that the small image was displayed in the position different from the position at the time of FIG. It is a timing chart at the time of the display of FIG. It is a timing chart when performing the display of FIG. 3 by another operation | movement. It is a timing chart when performing the display of FIG. 3 by still another operation | movement. It is a figure which shows a mode that the some small image was displayed by changing a position and timing mutually. It is a figure which shows a mode that the character string "with incoming call" is scrolled and displayed from right to left. It is a figure which shows the mode in the liquid crystal display device which concerns on 2nd Embodiment. FIG. 10 is a timing chart for the display of FIG. 9. FIG. It is a figure which shows schematic structure and the mode of a display of the liquid crystal display device which concerns on 3rd Embodiment. 12 is a timing chart for the display of FIG. It is a figure which shows the schematic structure of the conventional liquid crystal display device, and the mode of a display. It is a timing chart at the time of the display of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal panel 2 ... External circuit 11 ... Display area 12 ... Signal circuit 13 ... Scanning circuit 14, 14 ', 21 ... Memory 15, 22 ... Control circuit

Claims (10)

In a liquid crystal display device in which an image is transmitted and displayed on a liquid crystal panel having a display area where the image is displayed,
The liquid crystal panel is
A memory that is provided in an area excluding the display area of the liquid crystal panel and stores the small image when a small image smaller than the large image of the size of the display area is transmitted;
A control circuit provided in an area excluding the display area of the liquid crystal panel, displaying the small image in the display area, storing the small image in the memory, and displaying the stored small image again. A liquid crystal display device characterized by the above.   The liquid crystal display device according to claim 1, wherein the control circuit changes a position where the small image is displayed when the small image is displayed.   In the display of the small image, the control circuit displays a part of the small image and displays a part excluding the part of the small image at a position different from a position where the part is displayed. The liquid crystal display device according to claim 1.   4. The liquid crystal display device according to claim 1, wherein the control circuit displays a uniform image in a region other than a region where a small image is displayed in the display region. 5.   4. The control circuit according to claim 1, wherein the control circuit displays a uniform image in the display area, and displays the small image in the display area where the uniform image is displayed. Liquid crystal display device. A second memory provided in an area excluding the display area of the liquid crystal panel and storing a small image smaller than the large image;
The control circuit displays a small image stored in the second memory at a position different from a position where the small image stored in the memory is displayed, and the small image is displayed in the second memory. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device stores the small image and displays the stored small image again.   The element constituting the small image stored in the memory is 3 bits, and 1 bit of the 3 bits indicates the presence or absence of red coloring at the position of the element, and 1 bit of the remaining 2 bits is the element. 7. A liquid crystal display according to claim 1, wherein the presence or absence of green coloration at said position is indicated and the remaining 1 bit is set to indicate the presence or absence of blue coloration at the position of said element. apparatus.   7. The element constituting the small image stored in the memory is 1 bit, and the 1 bit is set so as to indicate white or black coloring at the position of the element. A liquid crystal display device according to claim 1.   The liquid crystal panel includes a substrate made of a glass material and a polysilicon film formed on the substrate by a low temperature process, and the memory is constituted by a thin film transistor made of the polysilicon film. The liquid crystal display device according to any one of 1 to 8.   10. The liquid crystal panel according to claim 1, wherein the small image is displayed by reflecting external light incident on the liquid crystal panel within the liquid crystal panel. The liquid crystal display device according to any one of the above.

Images