JP2010262234A - Liquid crystal display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display apparatus of high display quality for suppressing that the brightness, chromaticity or the like changes between a part constituted so as to be transparent and the other part. <P>SOLUTION: This liquid crystal display apparatus includes a liquid crystal display panel 10 having a display section 11, an lighting means for lighting the display section 11, and a transmission controlling means 24 arranged between the liquid crystal display panel 10 and the lighting means to face at least a part of the display section 11. The lighting means includes a first lighting system 20 for lighting the display section 11, and a second lighting system 30 arranged on the rear side of the first lighting system 20 and lighting a part of the display section facing at least transmission control means 24. The first lighting system 20 and second lighting system 30 have transmission means 26 and 32 allowing visual recognition of the rear side from the liquid crystal display panel 10 side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to an active matrix type liquid crystal display device.

  The liquid crystal display device includes a liquid crystal display panel including a display unit, and illumination means for illuminating the display unit. For example, a liquid crystal display device mounted on a gaming machine may be configured so that the rear side is visible from a part of the display portion so that a structure such as a reel can be visually recognized.

  As described above, when a part of the display unit is configured to be transparent, an image may not be displayed on the entire display unit of the liquid crystal display panel.

  For example, in Patent Document 1, a liquid crystal display device mounted on a gaming machine includes a polymer liquid crystal panel that can be switched between a light transmitting state and a non-transmitting state, and an opening provided on the back surface of the liquid crystal panel. By attaching a polymer liquid crystal panel and making the polymer liquid crystal panel opaque, the visibility of the image displayed by the liquid crystal panel is improved over the entire surface, and the structure can be visually recognized when an event occurs. Techniques have been proposed that enable acting production using structures.

JP 2007-29406 A

  However, since the liquid crystal display device disclosed in the above document shares the illumination means in the region facing the opening of the liquid crystal panel and the other region, the brightness of the region facing the opening and the other region is bright. It was difficult to adjust the sheath and chromaticity separately. As a result, the display quality may be deteriorated because the area facing the opening becomes dark or the color of the image displayed in the area facing the opening is different from that of the other areas.

  It is also possible to provide a light source on the back side of the liquid crystal panel where the structure is installed, but it is difficult to irradiate light uniformly to the liquid crystal panel, and it is possible to adjust brightness, chromaticity, etc. was difficult.

  The present invention has been made in view of the above circumstances, and suppresses differences in brightness, chromaticity, and the like between the transparent portion of the display portion and other portions, and has good display quality. An object is to provide a liquid crystal display device.

  A liquid crystal display device according to an aspect of the present invention includes a liquid crystal display panel including a display unit, illumination means for illuminating the display unit, and at least part of the display unit between the liquid crystal display panel and the illumination unit. A transmission control means arranged to face the first illumination device, the illumination means arranged on the back side of the first illumination device, and at least the transmission control means. A second illuminating device that illuminates a part of the display unit opposed to the first illuminating device, and the first illuminating device and the second illuminating device include transmission means that can visually recognize the back side from the liquid crystal display panel side. A liquid crystal display device provided.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that a brightness, chromaticity, etc. differ in the part comprised so that the display part was transparent, and another part, and can provide a liquid crystal display device with a favorable display quality.

It is a figure for demonstrating the example of 1 structure of the liquid crystal display device which concerns on one Embodiment of this invention. It is a figure which shows roughly an example of the cross section in line | wire II-II of the liquid crystal display device shown in FIG. FIG. 2 is a diagram for explaining a case where an image is displayed on the entire display unit in the liquid crystal display device shown in FIG. 1. In the liquid crystal display device shown in FIG. 1, it is a figure for demonstrating the case where an image is displayed so that the back side can be visually recognized from a part of display part. It is a figure which shows roughly the other example of the cross section in line | wire II-II of the liquid crystal display device shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail. As shown in FIGS. 1 and 2, the liquid crystal display device according to the present embodiment accommodates a liquid crystal display panel 10, a light source device that illuminates the liquid crystal display panel 10 from the back, and the liquid crystal display panel 10 and the light source device. And a housing 40 to be operated.

  The liquid crystal display panel 10 includes a pair of substrates arranged opposite to each other, that is, an array substrate 12 and a counter substrate 14, and a liquid crystal layer LQ held between the array substrate 12 and the counter substrate 14. Polarizing plates (not shown) are respectively arranged outside the array substrate 12 and the counter substrate 14.

  The liquid crystal display panel 10 has a substantially rectangular display unit 11 on which an image is displayed. The display unit 11 includes a plurality of pixels PX arranged in a matrix. In the display unit 11, the array substrate 12 extends along the plurality of scanning lines GL (GL 1, GL 2, GL 3...) Extending along the row direction of the plurality of pixels PX, and along the column direction of the plurality of pixels PX. A plurality of signal lines SL (SL1, SL2, SL3...), And switching elements SW arranged for each pixel PX in the vicinity of the intersections between the scanning lines GL and the signal lines SL, and the signal lines SL via the switching elements SW. A plurality of connected pixel electrodes PE are provided.

  The counter substrate 14 includes a counter electrode CE and the like common to the plurality of pixels PX in the display unit 11. The array substrate 12 and the counter substrate 14 are arranged with the pixel electrode PE and the counter electrode CE facing each other, and a gap is formed between them. The liquid crystal layer LQ is formed of a liquid crystal composition sealed in the gap between the array substrate 12 and the counter substrate 14.

  A video signal is supplied from the corresponding signal line S to the pixel electrode PE via the switching element SW. A counter voltage is supplied to the counter electrode CE from a counter electrode driving circuit (not shown). The alignment state of the liquid crystal molecules contained in the liquid crystal layer is controlled according to the potential generated by the voltage supplied to the pixel electrode PE and the counter electrode CE.

  A circuit board (not shown) is connected to one side edge of the liquid crystal display panel 10 via a flexible board (not shown). The circuit board is arranged on the back side of the light source device by curving the flexible substrate toward the back side of the light source device. The circuit board supplies a drive signal to the liquid crystal display panel 10. The liquid crystal display panel 10 is held around the display unit 11 by a housing 40.

  The light source device includes a first light source device 20 and a second light source device 30 disposed on the back side of the first light source device 20. The first light source device 20 and the second light source device 30 are independently driven and controlled by driving means (not shown). The first light source device 20 is disposed on the back side of the liquid crystal display panel 10 and is accommodated in the housing 40. The first light source device 20 includes two light sources L1 and L2, and a first light guide 26 that guides light emitted from the light sources L1 and L2 to the liquid crystal display panel 10 side.

  The first light guide 26 is, for example, a prism light guide as a transmission means, and is a substantially transparent body that allows the back side to be viewed from the liquid crystal display panel 10 side. The first light guide 26 includes two main surfaces facing each other, a first incident surface 26A on which light emitted from the light source L1 is incident and a second incident surface 26B on which light emitted from the light source L2 is incident. And surfaces 26C and 26D. The first incident surface 26A and the second incident surface 26B face each other and extend between the two main surfaces 26C and 26D. One main surface 26 </ b> C faces the liquid crystal display panel 10.

  The light source L1 is surrounded by the first incident surface 26A and the light source holder HL1. The light source holder HL1 reflects the light emitted from the light source L1 toward the first incident surface 26A. Similarly, the light source L2 is surrounded by the second incident surface 26B and the light source holder HL2. The light source holder HL2 reflects the light emitted from the light source L2 to the second incident surface 26B side.

  Between the main surface 26C of the first light guide 26 and the liquid crystal display panel 10, an optical correction sheet 22 and a first PNLC (Polymer Network Liquid Crystal) film 24 as a transmission control means are disposed.

  The optical correction sheet 22 includes an opening 22 </ b> W that faces a part of the display unit 11 of the liquid crystal display panel 10. As shown in FIGS. 1 and 2, the first PNLC film 24 is disposed so as to face the opening 22 </ b> W of the optical correction sheet 22.

  The optical correction sheet 22 is, for example, a diffusion plate or diffusion sheet that diffuses light emitted from the main surface 26C of the first light guide 26, a prism sheet that collects diffused diffused light, a polarization separation sheet, or the like.

  A driving voltage is supplied to the first PNLC film 24 from driving means (not shown). When the driving voltage is not applied, the first PNLC film 24 diffuses the incident light and becomes clouded. When a drive voltage is applied to the first PNLC film 24, the first PNLC film 24 becomes transparent and transmits incident light.

  A reflective sheet 28 is disposed on the main surface 26 </ b> D side of the first light guide 26. The reflection sheet 28 reflects the light emitted from the main surface 26D of the first light guide 26 and reflects it to the first light guide 26 side. The reflection sheet 28 includes an opening 28 </ b> W corresponding to the position of the opening 22 </ b> W of the optical correction sheet 22.

  The second light source device 30 is arranged to face the position of the opening 28 </ b> W of the reflection sheet 28, and the periphery is held by the housing 40. The second light source device 30 includes a light source L3 and a light guide 32 that guides light emitted from the light source L3 to the first light source device 20 side.

  The 2nd light guide 32 is a substantially transparent body which can recognize the back side from the liquid crystal display panel 10 side. The second light guide 32 is a prism light guide as a transmission means, and includes an incident surface 32A on which light emitted from the light source L3 is incident, and two main surfaces 32B and 32C facing each other. Yes.

  The incident surface 32A extends between the two main surfaces 32B and 32C. One main surface 32 </ b> B faces the liquid crystal display panel 10. The light source L3 is surrounded by the incident surface 32A and the light source holder HL3. The light source holder HL3 reflects the light emitted from the light source L3 toward the incident surface 32A.

  On the main surface 32 </ b> C side of the light guide 32, a second PNLC film 34 as a second transmission control unit is disposed. The second PNLC film 34 is disposed so as to face the main surface 32C.

  A driving voltage is supplied to the second PNLC film 34 from driving means (not shown). When the driving voltage is not applied, the second PNLC film 34 diffuses the incident light and becomes clouded. When a drive voltage is applied to the second PNLC film 34, the second PNLC film 34 becomes transparent and transmits incident light.

  When a drive voltage is supplied to both the first PNLC film 24 and the second PNLC film 34, both the first PNLC film 24 and the second PNLC film 34 become transparent as shown in FIG.

  At this time, the structure 100 disposed on the back side of the second light source device 30 is displayed on the liquid crystal display via the first light guide 26, the first PNLC film 24, the second light guide 32, and the second PNLC film 34. It becomes visible from the panel 10 side. At the same time, when the light source L3 is turned off, the structure 100 is easily visible.

  When the driving voltage is not supplied to the first PNLC film 24 and the second PNLC film 34, the first PNLC film 24 and the second PNLC film are emitted from the first light guide 26 and the second light guide 32. Can be used as a diffusion sheet for diffusing.

  At this time, the structure 100 becomes invisible from the liquid crystal display panel 10 side, and the display quality is lowered as shown in FIG. 3 by adjusting the brightness of the light emitted from the second light source device 30. The image can be displayed on the entire display unit 11.

  That is, the brightness and chromaticity can be adjusted by the second light source device 30 for the region of the display unit 11 where the structure 100 can be visually recognized by driving the first PNLC film 24 and the second PNLC film 34. It is possible to provide a liquid crystal display device with good display quality.

  Therefore, according to the liquid crystal display device according to the present embodiment, it is possible to suppress the brightness, chromaticity, and the like from being different between the transparent portion of the display unit 11 and the other portions, and to have a good display quality. A display device can be provided.

  Next, a liquid crystal display device according to a second embodiment of the present invention will be described with reference to the drawings. In the following description, the same components as those of the liquid crystal display device according to the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, the liquid crystal display device according to the present embodiment includes a liquid crystal display panel 10, a first light source device 20, and a second light source device 30.

  In the liquid crystal display device according to the present embodiment, the first PNLC film 24 is disposed so as to face the entire display unit 11 of the liquid crystal display panel 10. A driving voltage is supplied to the first PNLC film 24 from driving means (not shown). In the present embodiment, the first PNLC film 24 can drive the transmission control unit 24 </ b> A facing the opening 22 </ b> W of the optical correction sheet 22 and its surroundings independently.

  In the present embodiment, since the first PNLC film 24 is disposed so as to face the entire display unit 11, the optical correction sheet 22 can be omitted.

  When the drive voltage is supplied to the transmission control unit 24A of the first PNLC film 24 and the drive voltage is supplied to the second PNLC film 24, as shown in FIG. 4, the transmission control unit 24A and the second PNLC film 34 of the first PNLC film 24 Becomes transparent.

  At this time, the structure 100 disposed on the back side of the second light source device 30 includes the first light guide 26, the transmission control unit 24A of the first PNLC film 24, the second light guide 32, and the second PNLC film 34. Therefore, it becomes visible from the liquid crystal display panel 10 side. At the same time, when the light source L3 is turned off, the structure 100 is easily visible.

  The first PNLC film 24 and the second PNLC film are emitted from the first light guide body 26 and the second light guide body 32 when the entire first PNLC film 24 and the second PNLC film 34 are made cloudy without supplying a driving voltage. It can be used as a diffusion sheet that diffuses light.

  At this time, the structure 100 becomes invisible from the liquid crystal display panel 10 side, and the display quality is lowered as shown in FIG. 3 by adjusting the brightness of the light emitted from the second light source device 30. The image can be displayed on the entire display unit 11.

  That is, according to the liquid crystal display device according to the present embodiment, the same effect as that of the liquid crystal display device according to the first embodiment described above can be obtained.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. For example, in the liquid crystal display devices according to the first and second embodiments described above, the structure 100 on the back side can be visually recognized in the central portion of the display unit 11, but the portion that is configured to transmit the back side is It is not limited to the central part of the display unit 11.

  For example, the upper part of the display unit 11 may be configured to be transmissive. In that case, by disposing the first PNLC film 24, the second light source device 30, and the second PNLC film 34 so as to correspond to at least the upper portion of the display unit 11, the liquid crystal according to the first and second embodiments described above is provided. The same effect as that of the display device can be obtained.

  Further, in the liquid crystal display devices according to the first and second embodiments described above, there is one portion configured to transmit the back side, but there may be two or more portions that can transmit the back side. . In that case, the 1st PNLC film 24, the 2nd light source device 30, and the 2nd PNLC film 34 may be arrange | positioned so as to correspond to each part, and it respond | corresponds to both two or more parts which can permeate | transmit a back side. As described above, the first PNLC film 24, the second light source device 20, and the second PNLC film 34 may be disposed.

  Even in this case, the same effects as those of the liquid crystal display devices according to the first and second embodiments described above can be obtained.

  In the liquid crystal display devices according to the first and second embodiments described above, a PNLC film is used as the transmission control unit. However, the transmission control unit is a PNLC as long as it can switch between transmission and non-transmission of light. Not limited to film.

  Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

  For example, the liquid crystal display device according to the first and second embodiments described above includes the second PNLC film 34, but may be omitted depending on the light reflection efficiency of the second light guide 32. When the light reflection efficiency of the second light guide 32 is good, even if the second PNLC film 34 is omitted, the same effects as those of the liquid crystal display devices according to the first and second embodiments described above can be obtained.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display panel, 11 ... Display part, 20 ... 1st light source device (1st illumination device), 24 ... PNLC film, 26 ... 1st light guide (transmission means), 30 ... 2nd light source device (2nd Illumination device), 32... Second light guide (transmission means).

Claims (5)

A liquid crystal display panel having a display unit;
Illumination means for illuminating the display unit;
A transmission control unit disposed between the liquid crystal display panel and the illumination unit so as to face at least a part of the display unit;
The illumination means is a first illumination device that illuminates the display unit, and a second illumination device that is disposed on the back side of the first illumination device and illuminates at least a part of the display unit facing the transmission control unit. And
The first illuminating device and the second illuminating device are liquid crystal display devices including transmission means that can visually recognize the back side from the liquid crystal display panel side.   The liquid crystal display device according to claim 1, wherein the transmission control unit is disposed to face the entire display unit.   The liquid crystal display device according to claim 1, further comprising second transmission control means disposed on a back surface of the second lighting device. The first lighting device includes a first light source and a second light source,
The liquid crystal display device according to claim 1, wherein the transmissive unit is disposed between the first light source and the second light source. Optical correction means disposed between the liquid crystal display panel and the first illumination means;
The liquid crystal display device according to claim 1, wherein the optical correction unit includes an opening facing the first transmission control unit.

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