JP2009244582A - Laser pointing device for large-sized liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser pointing device for a large-sized liquid crystal display for accurately commanding a pointing position on the liquid crystal display with a laser beam pointer. <P>SOLUTION: The laser pointing device for the large-sized liquid crystal display includes: the large-sized liquid crystal display 1; a pointing screen 14 formed on the surface of the liquid crystal display 1; and a laser beam pointer 21 for irradiating the laser pointing position of the liquid crystal display 1 with laser light 22 by being opposed to the laser pointing screen 14. The laser light 22 from the laser beam pointer 21 is irradiated on the laser pointing screen 14 to command the laser pointing position on the surface of the liquid crystal display 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a laser pointing device for a large liquid crystal display device (liquid crystal display).

Conventionally, a large liquid crystal display device has a structure that has a glossy surface for a current television because of its structure, and has a property that it is difficult to reflect light from the entire surface.・ You cannot point clearly with a pointer.
Masahiro Koto, Koichi Taniguchi, Kazuyuki Tsutomu, Hiroshi Sasamura, Tatsushi Nomura, Kazumasa Hiramatsu, “Development of AlGaN-based UV Photodetector”, Mitsubishi Electric Industrial Times, 2001 (January, 2001), No. 97, pp. . 80-84

  In a situation where a large liquid crystal display device is used in various presentations, it is possible to perform necessary pointing using a pointer of an input device such as a mouse of a personal computer that draws the display contents. When the range of points covers a variety of objects such as a plurality of display devices and specific objects other than the display device, the advantage of being able to point by one laser pointer is great.

  However, at present, no indication is given by a single laser pointer on the liquid crystal display device.

  In view of the above situation, an object of the present invention is to provide a large-sized laser pointing device for a liquid crystal display device that can accurately indicate a laser pointing position on the liquid crystal display device by a laser beam pointer. To do.

In order to achieve the above object, the present invention provides
[1] In a laser pointing device for a large liquid crystal display device, the large liquid crystal display device, a laser pointing screen formed on the surface of the liquid crystal display device, and the laser pointing screen are opposed to each other. A laser beam pointer for irradiating a laser beam to a laser pointing position of the liquid crystal display device, and irradiating the laser beam from the laser beam pointer on the laser pointing screen, The laser pointing position on the surface of the display device is indicated.

  [2] In the laser pointing device for a large liquid crystal display device according to [1], the laser pointing screen has an optical scatterer on a surface of the laser pointing screen.

  [3] The laser pointing device for a large liquid crystal display device according to [1], wherein the laser pointing screen is made of a matrix of thin film phototransistors having light emitting elements using a transparent substrate. Features.

  [4] The laser pointing device for a large liquid crystal display device according to the above [3], wherein the laser beam pointer is irradiated with an ultraviolet laser and is received by a light receiving element having sensitivity to the ultraviolet region. To do.

  According to the present invention, it is possible to accurately indicate the laser pointing position by a laser beam from a laser beam pointer on a large liquid crystal display device with a simple configuration. In particular, the effect in the presentation using a large liquid crystal display device is remarkable.

  A laser pointing device for a large liquid crystal display device of the present invention is a large liquid crystal display device, a laser pointing screen formed on the surface of the liquid crystal display device, and the laser pointing screen. A laser beam pointer for irradiating a laser beam to a laser pointing position of the liquid crystal display device, and irradiating the laser beam from the laser beam pointer on the laser pointing screen, Indicates the laser pointing position on the surface of the display device.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a diagram showing an example of a liquid crystal display screen for pointing with a large liquid crystal display pointing device according to an embodiment of the present invention, and FIG. 2 is a large liquid crystal display laser according to the first embodiment of the present invention. FIG. 3 is a diagram showing a pointing device (device), and FIG. 3 is a configuration diagram of a laser pointing device for a large liquid crystal display device showing a first embodiment of the present invention.

  In FIG. 1, A indicates a screen of a large liquid crystal display device, and B indicates a laser pointing position on the screen A of the large liquid crystal display device.

  In FIG. 2, 1 is a large-sized liquid crystal display device, and this liquid crystal display device 1 is provided with a backlight source 2, a polarizing plate 3, and a glass substrate 4 on the back side. On the glass substrate 4, a TFT 5A, a transparent pixel electrode 5B, a bus electrode 5C, and the like are formed.

  Further, reference numerals 6 and 7 denote alignment films, and a liquid crystal 8 is provided between the alignment films 6 and 7. 9 is a transparent electrode, 10 is a color filter, 11 is a black matrix, 12 is a glass substrate, and 13 is a polarizing plate on the surface.

  As shown in FIG. 3, a laser pointing screen (beam reflecting screen) 14 such as glass powder or ceramic as an optical scatterer is formed on a polarizing plate on the surface of a large liquid crystal display device 1.

  Reference numeral 21 denotes a laser beam pointer. When the laser beam 22 irradiated from the laser beam pointer 21 is irradiated onto the laser pointing screen 14, glass as an optical scatterer of the screen 14 is displayed. The beam is scattered and reflected by powder or the like, and the position can be indicated on the surface of the liquid crystal display device 1. That is, the laser pointing position 23 is indicated.

  Here, the laser pointing screen 14 can enable scattering and reflection with a luminance sufficient for pointing without significantly degrading the visibility of the large-sized liquid crystal display device 1.

  The base material of the laser pointing screen 14 may be anything as long as it has a high light transmission property. By applying a fine powder of glass on the surface, the glass powder is not degraded without deteriorating the visibility of the liquid crystal display on the back surface. Therefore, necessary scattering reflection can be realized.

  Further, as shown in FIG. 4, when a transparent resin base material 31 is used, a transmission screen having the same effect can be obtained by blending an appropriate amount of glass powder 32 as an optical scatterer into the composition of the resin base material 31. Can be realized.

  FIG. 5 is a configuration diagram of a large-sized laser pointing device for a liquid crystal display device according to a second embodiment of the present invention.

  In this figure, 41 is a large liquid crystal display device, 42 is a transparent substrate such as glass formed on the surface of the large liquid crystal display device 41, and 43 is a thin film phototransistor formed on the transparent substrate 42. A laser pointing screen comprising a matrix of 44; 44A, a light emitting diode connected to the thin film phototransistor 44; 45, a laser beam pointer; 46, laser light emitted from the laser beam pointer 45; -Pointing position.

  As described above, by using the matrix of the thin film phototransistor 44 having the light emitting diode 44A using the transparent base material 42, the sensitivity of the thin film phototransistor 44 is made to correspond to the wavelength of the laser beam pointer 45, thereby emitting light. The diode 44A can be driven to indicate the laser pointing position 47. That is, when the thin film phototransistor 44 is turned on, the light emitting diode 44A connected to the thin film phototransistor 44 is driven to give an instruction by pointing.

  In the above embodiment, a system having a matrix of light-emitting elements covering a display for displaying content is described. However, the present invention is not limited to this, and the pointing mark has an original characteristic with respect to the luminance and contrast ratio of the pointing mark. The present invention can also be applied to a system that can express sufficient visibility with the same brightness and contrast ratio as the content displayed on the liquid crystal display.

  Further, since it is difficult for the thin film phototransistor 44 to be turned on by the light component of the backlight light source of the large liquid crystal display device 41, the thin film phototransistor 44 is light having a wavelength shorter than that of the backlight, for example, in the ultraviolet region. It is necessary to use one having sensitivity. The laser beam pointer 45 pointing to the thin film phototransistor 44 is also configured to include an ultraviolet light component corresponding thereto.

  The thin film phototransistor that realizes sensitivity to the ultraviolet region is formed by bonding a gold thin film and an N layer thin film, for example, instead of the P layer, whereas a normal thin film phototransistor is formed by a semiconductor PN junction. be able to.

  This point will be described in detail.

  In order to use laser pointer pointing as input information for a personal computer (PC), the object is to match the sensitivity of the phototransistor in the liquid crystal display of the PC with the wavelength of the laser pointer. At that time, in order for the phototransistor to react only to the light of the laser pointer, not the backlight of the PC, the light component of the laser pointer and the sensitivity of the phototransistor need to be in the ultraviolet range shorter than visible light There is.

  A photodiode used for a general phototransistor has a sensitivity from visible light to an infrared region, and many have a peak sensitivity in an infrared region having a wavelength of 800 nm or more. Photodiodes include PN type, PIN type, Schottky type, and avalanche type (APD). In particular, when a schottky type is used instead of the PN type P layer, a short wavelength is high. Since it becomes a sensor and can be sensitive to the ultraviolet region (see Non-Patent Document 1), the present invention can also be configured to receive the pointing of the laser pointer with such a Schottky photodiode.

  Even with the current silicon thin film phototransistor, by using techniques such as shadow masks, light from the backlight source, including reflected light from the liquid crystal structure, can be prevented from entering the thin film phototransistor. If available.

  If the shadow mask technology is used, photosensor elements (solar cells, CdS, CdSe, PdS, CCD, etc.) other than thin film phototransistors can be used.

  Note that the pointing position can be input to the personal computer by using the matrix of the thin film phototransistor 43.

  FIG. 6 is a block diagram of a laser pointing device for a liquid crystal display device according to a third embodiment of the present invention.

  In this figure, 51 is a liquid crystal display device, 52 is a half mirror, and 53 is a matrix array.

  In the liquid crystal display device 51, it is possible to use a half mirror to realize a pointing mark with higher brightness than a mask including an optical scatterer even if the effective field of view is narrowed. If the half mirror 52 is placed on the table, it is possible to transmit the content with sufficient brightness as it is, and when this is pointed by the laser beam, the brightness of the laser beam is the liquid crystal Since it is much higher than the content displayed on the display, even with a weak half mirror, high brightness is realized in visibility.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The laser pointing device for a large liquid crystal display device of the present invention can be used particularly in the field of presentation using a large liquid crystal display device.

It is a figure which shows an example of the liquid crystal display screen which performs pointing with the laser pointing device for large sized liquid crystal display devices which shows the Example of this invention. It is a figure which shows the large-sized laser pointing device (device) for liquid crystal display devices which shows 1st Example of this invention. 1 is a configuration diagram of a laser pointing device for a large liquid crystal display device according to a first embodiment of the present invention. It is a modification of the large-sized laser pointing device for a liquid crystal display device showing the first embodiment of the present invention. It is a block diagram of the laser pointing device for large sized liquid crystal display devices which shows 2nd Example of this invention. It is a block diagram of the laser pointing device for large sized liquid crystal display devices which shows 3rd Example of this invention.

Explanation of symbols

A Screen of large liquid crystal display device B Laser pointing position on the screen of large liquid crystal display device 1,41,51 Liquid crystal display device 2 Backlight source 3,13 Polarizing plate 4,12 Glass substrate 5A TFT
5B Transparent pixel electrode 5C Bus electrode 6,7 Alignment film 8 Liquid crystal 9 Transparent electrode 10 Color filter 11 Black matrix 14 Laser pointing screen (beam reflection screen)
21, 45 Laser beam pointer 22, 46 Laser light 23, 47 Laser pointing position 31 Transparent resin base material 32 Glass powder as optical scatterer 42 Transparent base material 43 Laser pointing screen 44 Thin film phototransistor 44A Light emission Diode 52 Pointing half mirror that transmits light in one direction 53 Matrix array

Claims (4)

(A) a large liquid crystal display device;
(B) a laser pointing screen formed on the surface of the liquid crystal display device;
(C) a laser beam pointer facing the laser pointing screen and irradiating a laser beam to a laser pointing position of the liquid crystal display device;
(D) Large-sized liquid crystal characterized by irradiating the laser beam from the laser beam pointer onto the laser pointing screen to indicate the laser pointing position on the surface of the liquid crystal display device Laser pointing device for display devices.   2. The laser pointing device for a large liquid crystal display device according to claim 1, wherein the laser pointing screen has an optical scatterer on the surface of the laser pointing screen. Pointing device.   2. The large-sized laser pointing device for a liquid crystal display device according to claim 1, wherein the laser pointing screen is made of a matrix of thin film phototransistors having light emitting elements using a transparent substrate. Laser pointing device for liquid crystal display devices.   4. A large-sized liquid crystal display device according to claim 3, wherein said laser beam pointer is irradiated with an ultraviolet laser beam and is received by a light receiving element having sensitivity to the ultraviolet region. Laser pointing device for display devices.

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