JP2005275644A - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
JP2005275644A
JP2005275644A JP2004085999A JP2004085999A JP2005275644A JP 2005275644 A JP2005275644 A JP 2005275644A JP 2004085999 A JP2004085999 A JP 2004085999A JP 2004085999 A JP2004085999 A JP 2004085999A JP 2005275644 A JP2005275644 A JP 2005275644A
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liquid crystal
crystal display
pixel
sensor
display device
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JP2004085999A
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Japanese (ja)
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Sueyoshi Oshima
季佳 尾島
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Sharp Corp
シャープ株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display provided with a touch sensor capable of detecting contact even when force pushing a screen is weak. <P>SOLUTION: The liquid crystal display is provided with a liquid crystal display panel 11 having a backlight 10 emitting an invisible ray and a visible ray, and fist and second principle planes, and the backlight is arranged such that it is positioned in a second principle plane side. The liquid crystal display panel 11 has a first sensor detecting the invisible ray, and it includes a plurality of two-dimensionally arranged picture elements. Positional information of an object on the first principle plane is acquired by detecting reflected light obtained by reflecting the invisible ray emitted from the backlight and transmitted through the liquid crystal display panel by the object contacting or adjacent to the first principle plane of the liquid crystal display panel by the first sensor 25. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having an information input function on a screen.

  Conventionally, a touch sensor or a touch panel for detecting a position touched by a finger or a pen has been widely used as position information input means. In particular, a liquid crystal display device with a touch panel provided with a touch panel on the screen is explained in real-time by displaying on the screen the changing selectable operations and functions on a device with many functions, and selecting the operations and functions. Can be performed by a touch panel. For this reason, the operation of equipment is easy, and it is used as a user-friendly input device for information equipment such as a video camera and a car navigation system, industrial manufacturing equipment, and the like.

As a touch panel position detection method, a resistance film method or a capacitance method is generally used. In a conventional liquid crystal display device with a touch panel, it has been difficult to acquire position information of a contact object that is in contact at two or more places due to a restriction caused by the position detection method. In order to solve this problem, for example, Patent Document 1 supports a pair of panels in which a plurality of strip-like conductive patterns are arranged in parallel so that the conductive patterns intersect, and scans the conductive patterns. A method for detecting a contact point by pressing is disclosed.
JP 2002-342014 A JP-A-9-199086 Japanese Patent No. 3224467

  However, in the conventional touch panel and the touch panel disclosed in Patent Document 1, it is necessary to press and press the panel with a finger or a pen in order to detect position information. For this reason, there is a problem that if the pushing force is weak, it is not correctly detected.

  Further, when the input operation is repeated, a specific area of the touch panel is repeatedly contacted with a finger or a pen, so that there is a problem that the surface is easily deteriorated.

  In addition, by providing a touch panel on the screen of the display device, external light reflection occurs, the display light transmittance of the display device is reduced, and the visibility is lowered.

  An object of the present invention is to solve at least one of the conventional problems and to provide a display device capable of acquiring a plurality of pieces of position information.

  The liquid crystal display device of the present invention has a backlight that emits invisible light and visible light, and first and second main surfaces, and is arranged such that the backlight is located on the second main surface side. A liquid crystal display panel, each having a first sensor for detecting the invisible light, and including a plurality of pixels arranged two-dimensionally. The liquid crystal display panel emits from the backlight, and the liquid crystal By detecting reflected light obtained by reflecting invisible light transmitted through the display panel by an object that is in contact with or close to the first main surface of the liquid crystal display panel, the first main sensor detects the reflected light. The position information of the object on the surface is acquired.

  In a preferred embodiment, the pixel further includes a second sensor that detects visible light.

  In a preferred embodiment, the pixel includes a liquid crystal layer and a pair of polarizing plates sandwiching the liquid crystal layer, and the polarizing plate polarizes visible light and does not polarize invisible light.

  In a preferred embodiment, the pixel includes a pixel electrode and a counter electrode facing the pixel electrode, and the first sensor is provided in a region outside the region where the counter electrode and the pixel electrode are provided. .

  In a preferred embodiment, the liquid crystal panel includes a color filter provided with a plurality of N or more (N is an integer of 2 or more) filter portions that transmit light in different wavelength regions, and each adjacent N pixels. Each of which includes the N types of filter sections to constitute a color pixel.

  In a preferred embodiment, the color filter is provided with a plurality of three types of filter portions of red, blue, and green.

  In a preferred embodiment, the filter section covers a region where the counter electrode and the pixel electrode are provided and a region where the second sensor is provided.

  In a preferred embodiment, the liquid crystal display device includes: a first detection unit that generates position information of the object from a signal detected by a first sensor of the pixel; and the object based on the position information of the object. An image composition unit for correcting an image signal to be displayed on the liquid crystal display panel so that the visible light of the backlight is emitted from a pixel in a region located, and the liquid crystal based on an output obtained from the image composition unit A drive unit that drives the display panel and a second detection unit that generates two-dimensional image information from a signal detected by the second sensor of each pixel are further included.

  In a preferred embodiment, the first detection unit includes other pixels of the color pixel based on a signal detected by a first sensor of one pixel among N pixels constituting the color pixels. A signal detected by the first sensor is generated.

  In a preferred embodiment, the backlight includes a visible light source that emits visible light and an invisible light source that emits invisible light, and the invisible light source is driven at a predetermined period, and is from the first sensor. If the obtained detection signal coincides with the predetermined period, the position information of the object is acquired.

  According to the present invention, invisible light emitted from the backlight is used to detect an object that touches the screen. For this reason, it is not necessary for the object to come into strong contact with the screen, and the object can be reliably detected even if the pressing force is weak. For example, contact with a photograph or a picture can be detected. A plurality of positions can also be detected simultaneously.

  The liquid crystal display device of the present invention emits invisible light such as infrared rays from a backlight, and detects the invisible light reflected by an object such as a finger in contact with the screen with a sensor provided in the pixel. Thereby, the position information on the screen of the object is acquired. Since the reflection of the invisible light emitted from the backlight is used, position information can be acquired without bringing a finger or pen into strong contact with the screen. The liquid crystal display device of the present invention can also capture an image. Hereinafter, embodiments of the liquid crystal display device of the present invention will be described with reference to the drawings.

  1A and 1B schematically show a cross-sectional structure of one pixel 101 of the liquid crystal display device 100 according to the present embodiment. As shown in FIG. 2, FIG. 1 (a) and FIG. 1 (b) show the 1 (a) -1 (a) and 1 (b) -1 (b) cross sections of the pixel 101 orthogonal to each other. . As shown in FIG. 2, each pixel 101 is divided into regions 101a, 101b, and 101c. A region 101a of each pixel 101 is a pixel region for displaying an image, as in a normal liquid crystal display device. The area 101b is provided with a detection sensor that detects visible light, and captures an image of an object that has touched the screen. The region 101c is provided with a detection sensor that detects invisible light, and acquires position information of an object that has touched the screen.

  The liquid crystal display device 100 is a transmissive type, and includes a backlight 10 and a liquid crystal panel 11. The backlight 10 is provided in the regions 101a, 101b, and 101c of each pixel 101, and emits visible light and invisible light. When a color image is displayed by the liquid crystal display device 100, the visible light is preferably white light. The invisible light preferably includes a wavelength region that does not pass through the object whose position information is to be acquired. Infrared rays are reflected on the surface of many substances and do not damage the substances, so that they can be suitably used as invisible rays.

  A light source that emits visible light and invisible light may be used as the backlight 10, or different light sources that emit visible light and invisible light may be used in combination as the backlight 10. For example, the cold cathode fluorescent lamp disclosed in Patent Document 2 can be used as a light source that emits light in an infrared region and a visible light region. This cold cathode fluorescent lamp can emit light in the visible and infrared regions by using chromium-activated yttrium aluminate as a phosphor.

  As an example of configuring the backlight 10 by combining two or more light sources, for example, a combination of a white LED and an infrared LED can be suitably used. In this case, the white LED and the infrared LED can be turned on at different timings, and the position of the object can be detected independently of the image display, as will be described in detail below.

  The liquid crystal panel 11 has a first main surface 11a and a second main surface 11b, and is arranged so that the backlight 10 is located on the second main surface side. The liquid crystal panel 11 includes a plurality of pixels 101 arranged in two dimensions. Each pixel 101 includes a liquid crystal layer 17, a counter electrode 15 and a pixel electrode 19 arranged so as to sandwich the liquid crystal layer 17, and a counter electrode. 15 and the polarizing plate 13 and 20 arrange | positioned so that the pixel electrode 19 may be further pinched | interposed. Further, alignment films 16 and 17 for controlling the alignment of liquid crystal molecules constituting the liquid crystal layer 17 are provided between the liquid crystal layer 17 and the counter electrode 15 and the pixel electrode 19, respectively. The counter electrode 15 and the pixel electrode 19 are provided only in the region 101a. The liquid crystal layer 17 may also be present only in the region 101a, but may be present in the regions 101b and 101c.

  A switching element such as a TFT (not shown) is connected to the pixel electrode 19. A voltage is applied between the counter electrode 15 and the pixel electrode 19 according to the switching operation by the switching element to change the alignment of the liquid crystal. As a result, visible light is emitted from the backlight 10, and linearly polarized light transmitted through the polarizing plate 20 is modulated and visualized by the polarizing plate 13.

  In the present embodiment, the polarizing plates 13 and 20, the counter electrode 15, the pixel electrode 19, the liquid crystal layer 17, and the alignment films 16 and 18 transmit visible light and invisible light. The polarizing plates 13 and 20 have the property of polarizing visible light and transmitting invisible light without polarization. Such a polarizing plate is disclosed in Patent Document 3, for example. The polarizing plates 13 and 20 are provided in the regions 101a, 101b, and 101c.

  The thickness of the liquid crystal layer 17 is defined by the spacers 21 and 24. In each pixel 101, the pixel electrode 19 is disposed in the region 101a, and the spacer 21 and the spacer 24 are provided in the regions 101b and 101c, respectively. The spacers 21 and 24 may be provided in the entire regions 101b and 101c, or the spacers 21 and 24 may be provided only in a part of these regions. The spacers 21 and 24 transmit visible light and invisible light.

  As shown in the figure, each pixel 101 further includes a first sensor 25 and a second sensor 22. The first sensor 25 detects invisible light, and the second sensor 22 detects visible light. The first sensor 25 and the second sensor 22 are provided between the polarizing plate 13 and the polarizing plate 20 in the regions 101c and 101b. It may be provided between the polarizing plate 20 and the spacer 24 and between the polarizing plate 20 and the spacer 21.

  The liquid crystal panel 11 includes a color filter 14 so as to be positioned between the counter electrode 15 of each pixel 101 and the polarizing plate 13. The color filter 14 has a plurality of N types (integers of 2 or more) of filter units having different wavelength regions of light to be transmitted. These filter units are arranged in the region 101a and the region 101b, and adjacent pixels are covered with different types of filter units. At least one of the N types of filter units needs to transmit invisible light. The N types of filter sections are preferably selected so that the transmitted light becomes white by additive color mixture. Typically, red, blue, and green filter units are selected. Depending on the characteristics of the backlight 10 and the color and brightness of the image actually displayed on the liquid crystal display device, other color filters, white filters, etc. Filters of other colors may be used instead of red, blue and green.

  The liquid crystal panel 11 further includes an invisible light filter 27 provided in the region 101c of each pixel 101 and a BM layer 23 provided in the region 101b. The invisible light filter 27 transmits only invisible light and does not transmit visible light. The invisible light filter 27 may be provided as a part of the color filter 14. The BM layer 23 is provided between the second photosensor 22 and the polarizing plate 20 and blocks at least visible light. Invisible light may be further blocked. The BM layer 23 also functions to prevent light from the backlight 10 from leaking from the region 101b and to prevent the second sensor 21 from detecting visible light emitted from the back side. Similarly, in order to prevent detection of invisible light emitted from the backlight 10, a filter or a BM layer 26 for blocking invisible light is provided between the first optical sensor 25 and the polarizing plate 20 in the region 101c. Also good.

  In the liquid crystal panel 11, the color pixels 201 are two-dimensionally arranged as shown in FIG. It is preferable to arrange the color pixels 201 'shown in FIG. 4 alternately for each row so that the arrangement of the colors of the color pixels 201 is uniform. In the color pixel 201 ′, the arrangement of the pixel 101 </ b> R including the red filter portion with respect to the pixels 101 </ b> B and 101 </ b> G including the blue and green filter portions is opposite to that of the color pixel 201. Further, the arrangement of the region 101c in each pixel is inverted from that of the color pixel 201.

  Next, the function of each part of the pixel 101 will be described with reference to FIGS. As described above, the backlight 10 emits light L1 including visible light and invisible light. Since the light L1 emitted from the backlight 10 is blocked by the invisible light filter 27 and the BM film 23, the light L1 is emitted from the first main surface 11a side to the outside only in the region 101a. In the region 101a, the voltage applied to the liquid crystal layer 17 is switched corresponding to the image signal, and becomes a pixel region for displaying an image as in a normal transmissive liquid crystal display device.

  On the other hand, the first sensor 25 provided in the region 101c detects invisible light. Specifically, when an object comes into contact with or approaches the first main surface 11a of the liquid crystal panel 11, the light L1 emitted from the backlight 10 is reflected by the object and returns from the first main surface 11a into the liquid crystal panel 11. . At this time, the invisible light contained in the reflected light of the light L1 enters the first sensor 25 and is detected.

  Further, the second sensor 22 provided in the region 101b detects visible light. Since the filter portion of the color filter 14 is provided in the region 101b, the second sensor 22 detects visible light incident through each filter portion. Therefore, the second sensor 22 can detect the light intensity for each type of filter unit, and can capture a color image as the entire liquid crystal panel 11.

  FIG. 6 is a block diagram showing the overall structure of the liquid crystal display device 100. In order to control the function of each pixel to detect the position of an object in contact with each other and to capture an image, the liquid crystal display device 100 includes an LCD driving unit 151, an image composition unit 152, A detection unit 153, a second detection unit 154, and a backlight drive unit 155 are further provided.

  The first detection unit 153 sequentially scans the first photosensors 25 of the respective pixels arrayed two-dimensionally, and invisible light reflected by an object that has contacted the first main surface 11a of the liquid crystal panel 11 is predetermined. Detect at time intervals. Based on the detected signal, position information of the object on the screen is generated and output to the image composition unit 152.

  The image composition unit 152 receives an image signal to be displayed on the liquid crystal display device 100 and object position information. Then, based on the position information of the object, the image signal is corrected so that the visible light of the backlight 10 is emitted from the pixel in the region where the object is positioned, and is output to the LCD driving unit 151. When the position information of the object cannot be obtained from the first detection unit 153, the input image signal is output as it is.

  The LCD driving unit 151 drives the liquid crystal panel 11 based on the image signal received from the image composition unit 152 and displays an image. When an object is not in contact with the first main surface 11a, the liquid crystal display panel 11 displays an image based on the image signal input to the image composition unit 152. When the object is in contact with the first main surface 11a, visible light is emitted from all of the N types of filter units constituting the color pixel 201, and therefore the area in contact with the object is shown in white. In other portions, a video based on the image signal input to the image composition unit 152 is displayed.

  The second detection unit 154 sequentially scans the second photosensors 22 of the pixels arrayed two-dimensionally, and invisible light reflected by an object that has contacted the first main surface 11a of the liquid crystal panel 11 is predetermined. Detect at time intervals. Visible light emitted from the backlight passes through the respective filter units, reaches the object, is reflected, and then passes again through the filter unit of the same color and enters the second sensor 22. For this reason, the signal detected by the second sensor 22 correctly reflects the color information of the object. The second detection unit 154 generates two-dimensional image information based on the detected signal.

  Next, with reference to FIG. 6, FIG. 7, FIG. 8, and FIG. 9, the detection operation of an object that contacts the screen of the liquid crystal display device 100 will be described in detail. Invisible light is used to detect the object. As shown in FIG. 7, the invisible light emitted from the backlight 10 is not polarized by the polarizing plates 20 and 13. For this reason, a fixed amount of invisible light L2 is emitted from the first main surface 11a of the liquid crystal display panel 11 regardless of the change in the alignment state of the liquid crystal layer 17 caused by image display. Since image display is performed, visible light may be emitted from the first main surface 11a.

  When the object 300 is in contact with the first main surface 11a, the invisible light beam L2 is reflected by the object 300, and the reflected light R1 returns into the liquid crystal display panel 11. Then, it reaches the first sensor 25 and is detected. For example, the signal intensity of the invisible light detected by the first sensor 25 is monitored at a constant interval (for example, 1/60 second interval), and it is determined that the object has touched when exceeding a predetermined value. By performing detection by sequentially scanning the first sensor 25 of each pixel using the first detection unit 153, contact at a plurality of positions can be detected substantially simultaneously. Thereby, the first detection unit 153 generates a signal including the position information of the object 300.

  The detection of invisible light by the first sensor 22 is not limited to the first sensor 22 of the pixel from which the invisible light is emitted. As shown in FIG. 8, the invisible light beam L3 emitted from the pixel 101R can be detected by the second sensor 25 in the pixel 101R, and the invisible light beam L4 emitted from the pixel 101R is detected by the adjacent pixel 101B. It is also possible to detect by the second sensor 25. Furthermore, as shown in FIG. 9, the invisible light beam L5 emitted from the pixel 101R can also be detected by the second sensor 25 of the pixel 101G adjacent to the pixel 101R. For this reason, even when the intensity of the invisible light emitted by the wavelength region of the transmitted light of the filter unit is weak, it is possible to detect an object in the pixel using the invisible light having a high intensity emitted from another pixel.

  Depending on the environment in which the liquid crystal display device of the present invention is used, there may be a case where the invisible light is incident on the screen of the liquid crystal panel 11 from the outside and the position information of the object in contact with the screen cannot be detected correctly. In this case, the position information of the object may be acquired when the invisible light is emitted from the backlight at a period different from the period of the invisible light incident from the outside and a detection signal matching the period is obtained. As shown in FIG. 6, for example, an LED that emits visible light and an LED that emits invisible light are used as the backlight 10. For example, the backlight drive unit 155 drives the LED that emits invisible light so as to repeatedly turn on and off at a period of 1/30 seconds. When the signal obtained from the first sensor 25 coincides with the 1/30 period, the first detection unit 153 generates a signal indicating the position information, assuming that the position information of the object is obtained. . If the signal obtained from the first sensor 25 is continuous or has a period different from this period, it is determined that an invisible light beam incident from the outside is detected, and a signal indicating position information is not generated. By performing such detection, it is possible to block external influences and correctly detect an object.

  Thus, according to the present invention, invisible light emitted from the backlight is used to detect an object in contact with the screen. For this reason, it is not necessary for the object to come into strong contact with the screen, and the object can be reliably detected even if the pressing force is weak. For example, it is possible to detect contact with a photograph or a picture. A plurality of positions can also be detected simultaneously.

  Further, since it is not necessary to press the screen strongly, the surface of the liquid crystal panel is not deteriorated by a strong contact with a finger or a pen. Further, since an additional structure such as a touch panel for detecting an object is not provided on the surface of the liquid crystal panel, the visibility of the liquid crystal display panel is not deteriorated.

  In this embodiment, invisible light is detected in all three pixels constituting the color pixel 201, but detection is performed using only the first sensor 25 of any one pixel, and the detection result May be the detection result of the entire color pixel 201.

  Next, with reference to FIG. 6, FIG. 7, and FIG. 10, an operation for capturing an image of an object that contacts the screen of the liquid crystal display device 100 will be described.

  First, as illustrated in FIG. 7, the object 300 is brought into contact with the screen of the liquid crystal display panel 11, and the position information of the object 300 is acquired by the first detection unit 153 as described above. At this time, the invisible light may be detected by the first sensors 25 of the pixels 101R, 101G, and 101B constituting the color pixel 201 to obtain position information. Alternatively, invisible light is detected using only the first sensor 25 of the pixel 101R, and position information is generated based on the obtained result, assuming that similar detection results are obtained in the other pixels 101G and 101B. May be. In other words, the invisible light in the color pixel 201 may be detected by the pixel 101R. In this way, it may be determined whether an object is detected for each pixel, and position information may be generated, or among the pixels each having N types of filter units constituting the color pixel 201, Based on a signal detected by one sensor, a signal detected by a first sensor of another pixel may be generated.

  The obtained signal including position information is output to the image composition unit 152. Based on the position information of the object 300, the image construction unit 152 generates an image signal so that visible light from the backlight 10 is emitted from the pixels in the region where the object 300 is located. When displaying another image on the screen, the image signal is corrected so that the visible light of the backlight 10 is emitted from the pixel in the region where the object 300 is located. As described above, in the region where the object 300 is located, all the pixels constituting the color pixel are driven to be lit, so that white is displayed.

  The corrected image signal is output to the LCD driving unit 151, and the LCD driving unit drives the liquid crystal panel 11 based on the image signal.

  By this driving, in the pixel 101 in which the contact of the object 300 is detected by the first optical sensor 25 by the invisible light or the color pixel 201 including the pixel 101 in which the contact of the object 300 is detected by the first optical sensor 25, the liquid crystal layer 17, the visible light of the backlight 10 is emitted from the first major surface 11a. That is, light is emitted from the pixels 101R, 101B, and 101G having the red, blue, and green filter portions, and the visible light L4 is irradiated onto the surface that contacts the first main surface 11a of the object 300 as shown in FIG. . When the visible light L6 is reflected by the surface of the object, the visible light L6 is absorbed according to the image on the surface. Therefore, the reflected light R4 includes image information of the object.

  The reflected light R4 is detected by the second sensor 22 through the filter unit provided in each pixel from which the visible light L6 is emitted. The second detection unit 154 generates two-dimensional image information based on the detected signal. Thereby, the image information of the object can be acquired.

  With reference to FIG. 11A to FIG. 11C, the operation of capturing an image of an object that contacts the screen of the liquid crystal display panel 11 will be described more specifically.

  As shown in FIG. 11A, for example, an image in which a sample image 350b in which a person is photographed is inserted into a frame image 350a is displayed on a screen 350 of the liquid crystal display device 100, and the liquid crystal display device 100 is used. Then, the user's photograph is captured as image data, the captured image is replaced with the sample image 350b, and an operation of combining with the frame image 350a is performed.

  For this purpose, first, as shown in FIG. 11 (b), the user's photograph 300 is arranged so that its image plane faces the sample image 350 b on the screen 350.

  The liquid crystal display device 100 first acquires position information of the photograph 300 using invisible light. Then, based on the position information of the photograph 300, the area in contact with the photograph 300 is displayed in white. In an area other than the photograph 300, an image displayed first, that is, a frame image 350a is shown. At this time, even if the position of the photograph 300 of the user arranged with respect to the position of the sample image 350b is slightly shifted, the area to be displayed in white is determined based on the position information of the photograph 300. It matches the area displayed by.

  Next, the liquid crystal display device 100 detects reflected light from the white light photograph 300 emitted from the screen, and thereby acquires two-dimensional image information of the user's photograph 300. For example, as shown in FIG. 11C, the obtained two-dimensional image information can be combined with the frame image 350a as it is, and the frame image 350a and the image 350d incorporating the user's photograph can be displayed together.

  As described above, according to this embodiment, the position of the photograph is detected to determine the area into which the image is to be captured, so that trimming is not required when capturing the image. In addition, on the screen of the liquid crystal display device, it is possible to display an arbitrary image even when an image is captured in an area other than the area where the image is captured.

  In addition, since invisible light used for detecting the position of an object and visible light used for capturing an image can be emitted from the backlight of the liquid crystal display device, a plurality of objects in contact with the screen can be saved in a small space. A liquid crystal display device capable of acquiring position information and capturing an image is realized.

  In the above-described example, a still image is captured, but the object may be moving, or the portion of the object that contacts the screen may change with time. For example, when writing characters on the screen of the liquid crystal display device of the present invention using a brush with arbitrarily colored hair such as blue and red, the position and color of each hair in contact with the screen is converted into a movie. Can be captured. By displaying the acquired moving image on the screen or the screen of another image display device in real time, “colored brushstroke characters” can be displayed.

  Further, when a line drawing is drawn on the screen of the liquid crystal display device of the present invention using a pen in which a two-dimensional barcode is written at the pen tip, the barcode can be captured as an image. If the information held by the barcode is processed and a predetermined image is associated with the obtained information, for example, the predetermined image can be displayed at the position where the barcode is detected. In other words, not only the captured image is displayed, but also other images can be displayed in real time based on information obtained from the image.

  In the above embodiment, the liquid crystal display device includes a color liquid crystal display panel, but the liquid crystal display panel may perform monochrome display.

  The present invention can be used for various devices including a liquid crystal display device having an information input function on a screen. In particular, it can be suitably used for AV equipment such as a video camera and a car navigation system, and multifunctional industrial manufacturing equipment.

(A) And (b) has each shown typically the cross-section of the pixel which comprises the liquid crystal panel of the liquid crystal display device by this invention. 2 schematically shows a planar structure of the pixel shown in FIG. 1 schematically shows a planar structure of one color pixel. The other planar structure of 1 color pixel is shown typically. It is a top view explaining arrangement | positioning of a color pixel. It is a block diagram which shows the structure of a liquid crystal display device. It is sectional drawing explaining the position detection of the object which contacted the screen. It is another sectional view explaining position detection of an object which touched the screen. It is a top view explaining the position detection of the object which contacted the screen. It is sectional drawing explaining acquisition of the image information of the object which contacted the screen. (A)-(c) is a figure explaining an example of image taking-in operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Backlight 11 Liquid crystal display panel 13, 20 Polarizing plate 14 Color filter 15 Counter electrode 19 Pixel electrode 16, 18 Orientation film 17 Liquid crystal layer 21, 24 Spacer 22 Second sensor 23, 26 BM film 25 First sensor 100 Liquid crystal Display device 101 pixels 201 color pixels

Claims (10)

  1. A backlight that emits invisible and visible light; and
    A liquid crystal display panel having a first main surface and a second main surface, wherein the backlight is disposed on the second main surface side, each having a first sensor for detecting the invisible light. A liquid crystal display panel including a plurality of pixels arranged two-dimensionally;
    And the reflected light obtained by reflecting the invisible light emitted from the backlight and transmitted through the liquid crystal display panel by an object in contact with or close to the first main surface of the liquid crystal display panel. A liquid crystal display device that acquires position information of the object on the first main surface by detecting with a sensor.
  2.   The liquid crystal display device according to claim 1, wherein the pixel further includes a second sensor that detects visible light.
  3.   The liquid crystal display device according to claim 1, wherein the pixel includes a liquid crystal layer and a pair of polarizing plates sandwiching the liquid crystal layer, and the polarizing plate polarizes visible light and does not polarize invisible light.
  4.   4. The pixel according to claim 1, wherein the pixel includes a pixel electrode and a counter electrode facing the pixel electrode, and the first sensor is provided in a region outside the region where the counter electrode and the pixel electrode are provided. The liquid crystal display device according to any one of the above.
  5.   The liquid crystal panel includes a color filter provided with a plurality of N or more (N is an integer of 2 or more) filter portions that transmit light in different wavelength regions, and each of the N types of adjacent N pixels has the N types of color filters. The liquid crystal display device according to claim 1, wherein the liquid crystal display device includes a filter unit and constitutes a color pixel.
  6.   The liquid crystal display device according to claim 5, wherein the color filter is provided with a plurality of three types of filter portions of red, blue, and green.
  7.   The liquid crystal display device according to claim 5, wherein the filter section covers a region where the counter electrode and the pixel electrode are provided and a region where the second sensor is provided.
  8. A first detection unit that generates position information of the object from a signal detected by a first sensor of the pixel;
    An image composition unit for correcting an image signal to be displayed on the liquid crystal display panel so that the visible light of the backlight is emitted from a pixel in a region where the object is located based on the position information of the object;
    A drive unit for driving the liquid crystal display panel based on an output obtained from the image synthesis unit;
    A second detector that generates two-dimensional image information from a signal detected by the second sensor of each pixel;
    The liquid crystal display device according to claim 5, further comprising:
  9.   The first detection unit is a first sensor of another pixel of the color pixel based on a signal detected by a first sensor of one pixel among the N pixels constituting each color pixel. The liquid crystal display device according to claim 8, wherein the detected signal is generated.
  10. The backlight includes a visible light source that emits visible light and an invisible light source that emits invisible light,
    The liquid crystal display device according to claim 1, wherein the invisible light source is driven at a predetermined cycle, and the position information of the object is acquired when a detection signal obtained from the first sensor coincides with the predetermined cycle.
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