JP2010079195A - Visibility angle changing device for display, and visibility angle changing method for display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily change the angle of visibility of a display. <P>SOLUTION: A transmission plate arranged in a front face of the display is formed into a thin sheet-like shape having a cavity part with an irregularly worked inner face, and the angle of visibility of a display part is changed by filling or discharging a liquid having a refractive index same to that of a law material constituting the transmission plate into/from the cavity part in an inside of the transmission plate. Irregularity forming work in the inner face may be executed in either of a display side or in a side opposite to the display, or in the both thereof. A direction of the irregularity forming work in the inner face may be set optionally. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to changing the viewing angle of a display.

  In recent years, from the viewpoint of privacy protection and the like, there is a demand for preventing peeping on a display of a personal computer or a display of a mobile terminal such as a mobile phone. In addition, from the viewpoint of crime prevention, it is also necessary to prevent peeping at automatic transaction devices. Here, as an automatic transaction apparatus, ATM (Automated Teller Machine) of a bank can be illustrated.

  In order to meet the above-mentioned demands, optical filters that change the viewing angle and prevent peeping under the trade name such as “privacy filter” are now widely distributed.

  However, since these optical filters are attached to the front of the LCD screen, the optical filter is exposed to the outside and the surface of the optical filter is contaminated, preventing the optical filter from peeping. May decrease. In addition, the surface of the optical filter is easily damaged, and it is difficult to remove the optical filter from the front surface of the display screen of the liquid crystal display.

In order to solve this problem, there is a technique capable of easily removing the optical filter from the operation screen of the display (see, for example, Patent Document 1). By using the technique described in Patent Document 1, it is possible to easily perform the work of attaching and removing the optical filter to the display.
JP 2007-069555 A

  By using the technique as described above, there is an advantage that the viewing angle of the display device can be changed and peeping can be prevented.

  However, even if the viewing angle is narrowed during normal times, there may be situations where it is desired to widen the viewing angle for reasons such as browsing the screen in large numbers. In this case, conversely, narrowing the viewing angle as described above has been an adverse effect. If the optical filter is attached to the front of the display screen of the display, it is difficult to easily remove it, and even if the technique described in Patent Document 1 is used, the viewing angle can be quickly adjusted according to the user's needs. It cannot be changed.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a display angle changing device and a display angle changing method for a display that can easily change the viewing angle of the display.

  According to a first aspect of the present invention, there is provided a transmission plate disposed on the front surface of the display device, the transmission plate having a thin plate shape having a hollow portion with an uneven surface on the inner surface, There is provided a transmission plate characterized in that a viewing angle of the display unit is changed by filling or discharging a liquid having the same refractive index as that of a material constituting the transmission plate in the hollow portion of the plate.

  According to a second aspect of the present invention, the transmission plate provided by the first aspect, a pump for supplying and discharging the liquid, and a tank for storing the liquid at the time of draining, Provided is a viewing angle changing device characterized by having a sealed structure.

  According to a third aspect of the present invention, there is provided a method for changing a viewing angle in a transmission plate arranged in front of a display device, wherein the transmission plate has a thin plate shape having a hollow portion with an uneven surface on its inner surface. The viewing angle of the display unit is changed by filling or discharging a liquid having the same refractive index as that of the material constituting the transmitting plate into the cavity of the transmitting plate. A change method is provided.

  According to the present invention, it is possible to easily change the viewing angle of the display.

  The present invention is characterized in that the refractive index of light is used as means for changing the viewing angle of the display. This will be described in detail below with reference to the drawings.

  1 and 2 show a case where the present invention is applied to a display unit of a mobile terminal as an example of an embodiment of the present invention.

  The mobile terminal 10 which is this embodiment is shown on the left side of FIG. The mobile terminal 10 is a mobile terminal having a display unit, such as a mobile phone or a PHS (Personal Handy-phone System). The mobile terminal 10 has a display unit 20. The display unit 20 includes a display 21 and a transmission plate 22. The transmission plate 22 is disposed on the front surface of the display unit 20, and the display 21 is disposed after the transmission plate 22.

  The display device 21 is a display device such as liquid crystal or organic electroluminescence. The transmission plate 22 is used for changing the viewing angle of the display 21.

  Next, the structure of the transmission plate 22 will be described. FIG. 2 shows a transmission plate cross section 23 of the transmission plate 22 taken along the broken line portion shown on the right side of FIG.

  A cavity 24 is provided in the transmission plate section 23 of the transmission plate 22. Further, in the example of FIG. 2, unevenness processing is performed on one side of the cavity 24. In addition, in the example of FIG. 2, although uneven | corrugated processing is given to the back side (display 21 side) when the display part 20 is seen from the front, uneven | corrugated processing is carried out to the near side when the display part 20 is seen from the front. You may give, and you may give unevenness processing to both sides.

  Due to the presence of the cavity 24, the refractive index of the transmission plate 12 is different from the state without the cavity 24 (see a-1 in FIG. 2). On the other hand, when the cavity 24 is filled with the liquid 25 having the same refractive index as that of the transmission plate 12, it is optically equivalent to the state without the cavity 24 (see a-2 in FIG. 2). This point will be described with reference to FIG.

  FIG. 3 shows the difference in light transmission with and without the liquid 25. When there is no liquid 25 (see b-1 in FIG. 3), the image on the display unit looks normal when viewed from the front, but the image on the display unit is normal due to the unevenness of the cavity 24 when viewed from an oblique direction. can not see. On the other hand, when the liquid 25 is filled (see b-2 in FIG. 3), the image on the display portion looks normal when viewed from the front as well as when viewed from the front.

  As described above, according to the present invention, the viewing angle can be easily changed depending on the presence or absence of the liquid 25 in the transmission plate.

  Next, a modified example of the above-described embodiment will be described with reference to FIG. As shown in FIG. 4, the direction of the surface utilized when narrowing a viewing angle among the uneven | corrugated surface of the transmission plate 22 mentioned above is made to correspond with a user's gaze direction. By processing in this way, the display on the display 21 can be more appropriately blocked from the line of sight of a person other than the user.

  Furthermore, another modified example will be described. As shown in FIG. 5, an antireflection film is applied to the outer surface of the transmission plate 22. Thereby, the transmittance | permeability reduction accompanying transmission board 22 arrangement | positioning can be minimized.

  In addition to the above embodiments, the pump 40 for supplying and discharging the liquid 25 and the tank 50 for storing the liquid during drainage are provided. Further, the transmission plate 22, the pump 40, and the tank 50 have a sealed structure. The liquid 25 can be adjusted by operating the pump 40.

  Still another modification will be described with reference to FIG. In this modified example, as shown in FIG. 4, the two transmissive plates 22 are separated, and an uneven process of a shape that coincides with the surfaces facing each other is performed. The viewing angle can be changed by separating or superimposing the transmission plates 22 having a two-sheet separation structure. Specifically, when separated (see c-1 in FIG. 7), a space 27 is generated, and when viewed from an oblique direction, the image on the display unit cannot be normally viewed due to the unevenness of the space 27. On the other hand, when superimposed (see c-2 in FIG. 7), the image on the display portion looks normal not only when viewed from the front but also when viewed from an oblique direction. When this means is used, handling of the liquid 25 becomes unnecessary.

  In each embodiment of the present invention, various display devices can be used as the display 20. For example, general CRT (Cathode Ray Tube), liquid crystal, plasma, organic EL, etc. can be applied regardless of the type and size.

It is a figure showing the basic composition of the embodiment of the present invention. It is a figure showing the permeation | transmission board operation state of embodiment of this invention. It is a figure explaining changing a viewing angle in the embodiment of the present invention. It is a figure shown about the structure of the example of a change of embodiment of this invention. It is a figure shown about the structure which adds an antireflection film process surface as a modification of embodiment of this invention. It is a figure shown about the structure of the example of a change of embodiment of this invention. It is a figure shown about the structure of the example of a change of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Portable terminal 20 Display part 21 Display 22 Permeation | transmission board 23 Permeation | transmission board cross section 24 Cavity 25 Liquid 26 Concavity and convexity processing of inner surface 40 Pump 50 Tank 51 Liquid surface

Claims (16)

  A transmission plate disposed on a front surface of a display device, the transmission plate having a thin plate shape having a hollow portion with an uneven surface on an inner surface, and the transmission plate is disposed in the hollow portion of the transmission plate. The transmission plate is characterized in that the viewing angle of the display unit is changed by filling or discharging a liquid having the same refractive index as that of the material constituting the display.   2. The transmission plate according to claim 1, wherein the uneven processing of the inner surface is performed on either or both of the display side and the display side.   3. The transmission plate according to claim 1, wherein a direction of the uneven processing of the inner surface is arbitrarily set.   4. The transmission plate according to claim 1, wherein a direction of a surface used for narrowing a viewing angle among the uneven surfaces is made to coincide with a user's line-of-sight direction. Transmission plate.   5. The transmission plate according to claim 1, wherein the transmission plate is incorporated on a surface of a display device having the transmission plate and the display. 6.   In the transmission plate arranged on the front surface of the display, the transmission plate has a two-sheet separation structure, and is provided with uneven processing having a shape that coincides with the surface facing each other. A transmission plate characterized by changing a viewing angle.   The transmission plate according to any one of claims 1 to 6, wherein a reduction in transmittance due to the arrangement of the transmission plate is minimized by applying an antireflection film to the outer surface of the transmission plate. .   A permeation plate according to any one of claims 1 to 5, a pump for supplying and discharging the liquid, and a tank for storing the liquid at the time of draining, and having a sealed structure. A viewing angle changing device.   A method of changing a viewing angle in a transmission plate arranged on a front surface of a display device, wherein the transmission plate has a thin plate shape having a hollow portion with an uneven surface on an inner surface, and the cavity in the transmission plate A viewing angle changing method, wherein the viewing angle of the display unit is changed by filling or discharging a liquid having the same refractive index as that of the material constituting the transmission plate.   10. The viewing angle changing method according to claim 9, wherein the uneven processing of the inner surface is performed on either or both of the display side, the side opposite to the display side. .   The viewing angle changing method according to claim 9 or 10, wherein a direction of the unevenness processing of the inner surface is arbitrarily set.   The viewing angle changing method according to any one of claims 9 to 11, wherein a direction of a surface used for narrowing a viewing angle among the uneven surfaces is made to coincide with a user's line-of-sight direction. How to change the viewing angle.   The viewing angle changing method according to any one of claims 9 to 12, wherein the transmission plate is incorporated on a surface of a display device having the transmission plate and the display. .   A method of changing a viewing angle in a transmission plate disposed in front of a display device, wherein the transmission plate has a two-sheet separation structure, and is subjected to uneven processing of a shape that matches when overlapped on surfaces facing each other, A viewing angle changing method, wherein the viewing angle is changed by separating or superposing the transmission plates.   15. The viewing angle changing method according to any one of claims 9 to 14, wherein an antireflection film is provided on an outer surface of the transmission plate, thereby minimizing a reduction in transmittance due to the arrangement of the transmission plate. How to change the viewing angle.   A viewing angle changing device including a transmission plate disposed in front of the display, a pump for supplying and discharging the liquid, and a tank for storing the liquid when the liquid is discharged, and having a sealed structure 14. The viewing angle changing method according to claim 9, wherein each of the operations according to any one of claims 9 to 13 is performed by using the pump.

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