JPH0545647U - Liquid crystal display device and lighting plate - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the visibility of liquid crystal display devices. [Structure] As shown in FIG. 1B, a liquid crystal display 5 is formed by sequentially stacking a polarizing plate 3, a transparent substrate 1, a transparent substrate 2 and a polarizing plate 4. The transparent substrate 1 is provided with a step on the surface and is made of plastic. The transparent substrate 2 is made of plastic or glass. As shown in FIG. 1A, the liquid crystal display 5 thus formed is fitted into the hole of the panel 10 with a step, and then the conductive rubbers 7 and 7 and the lighting plate 6 are placed and the printed circuit board 9 is placed.
Is assembled and the assembly is completed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal display device and a daylighting plate thereof, and more particularly to means for improving visibility.

[0002]

[Prior Art]

 The structures of the conventional liquid crystal display device and the daylighting plate will be described with reference to FIGS. 7 to 11. The structure of the liquid crystal display 5 is shown in FIG. A transparent substrate 1 and a transparent substrate 2 are stacked, and a liquid crystal is sealed in a gap P between them. A polarizing plate 3 is arranged on the transparent substrate 1, and a polarizing plate 4 is arranged under the transparent substrate 2.

The transparent substrates 1 and 2 are made of glass or plastic and are provided with electrodes. An electric field is applied to the liquid crystal by the electrodes to control the passage of light through the polarizing plate 4, the transparent substrate 2, the liquid crystal, the transparent substrate 1 and the polarizing plate 3, and a display as shown in FIG. 7B appears.

FIG. 8A shows a structure in which light is applied to the liquid crystal display from behind. A diffusing plate 12 is placed under the liquid crystal display 5, a daylighting plate 6 is arranged under the diffusing plate 12, and is fixed to a print substrate 9 by a holder 8. Light source lamps 13, 13 are arranged on the side of the daylighting plate 6.

As shown in FIG. 8B, the light diffusing plate 12 is provided with grain (fine irregularities) on its surface. The light emitted from the light source lamps 13, 13 is transmitted to the diffuser plate 12 by the daylighting plate 6, and is diffused there to illuminate the liquid crystal display 5.

When the sunlight hits the liquid crystal surface, the sunlight is much stronger than the light of the lamp. In that case, the sunlight entering from the liquid crystal surface is diffused by the grain of the diffuser plate 12 and the grain becomes white. The characters are visible and legible.

FIG. 9A shows another structure for applying light to the liquid crystal display from behind. A daylighting plate 6 is arranged below the liquid crystal display 5, and is fixed to a printed circuit board 9 by a holder 8. Light source lamps 13, 13 are arranged on the side of the daylighting plate 6. As shown in FIG. 9B, the daylighting plate 6 has a white print 6a on its back surface.

The light emitted from the light source lamps 13, 13 is guided to the daylighting plate 6 and illuminates the liquid crystal display 5. The white print 6a reflects the light in the daylighting plate 6 to increase the illuminance of the liquid crystal display.

FIG. 10 shows a structure for mounting a liquid crystal display on a panel. A lighting plate 6 and conductive rubbers 7, 7 are arranged under the liquid crystal display 5 and fixed to a printed circuit board 9 by a holder 8. The liquid crystal display 5 and the printed circuit board 9 are electrically connected by the conductive rubbers 7, 7. A lamp is arranged on the side of the daylighting plate 6, but it is not visible in this section. The liquid crystal display device assembled in this manner is mounted so that the surface of the liquid crystal display 5 can be seen through a hole provided in the panel 10.

FIG. 11 shows an example of another mounting structure for a panel of a liquid crystal display. In this example, a front glass 11 is fitted in a hole of a panel 10, and a liquid crystal display device is attached so that a surface of a liquid crystal display 5 is located under the front glass 11. Other configurations are similar to those shown in FIG.

[0011]

[Problems to be solved by the device]

 The conventional liquid crystal display device shown in FIG. 8 has a drawback that when the sunlight hits the liquid crystal display in the daytime, the liquid crystal display is not sufficiently illuminated with only the reflected light from the diffuser plate, which makes it difficult to read the characters. ..

Further, in the conventional lighting plate of the liquid crystal display device shown in FIG. 9, since white printing is performed only on the back surface of the lighting plate, light leaks from the side surface and the reflectance of white printing cannot be increased. Therefore, there was a problem that the amount of light emitted from the liquid crystal display was insufficient and the display became dark. This tendency became even more noticeable when the thickness of the lighting plate was reduced in order to make the panel thinner.

In addition, the mounting structure of the liquid crystal display device shown in FIG. 10 has a drawback that the display portion is recessed from the surface of the panel, so that the design is inferior and the visibility is deteriorated.

In the mounting structure of the liquid crystal display device shown in FIG. 11, although the design is improved because the front glass is exposed to the panel surface, the visibility of the liquid crystal display device is also inferior because the surface is at the back. There was a drawback. There was also a problem that the number of parts increased and the cost increased.

The present invention has been made in view of the above points, and an object thereof is to provide a liquid crystal display device and a daylighting plate in which the amount of irradiation light increases.

Further, another object of the present invention is to provide a liquid crystal display device having good visibility and low cost.

[0017]

[Means for Solving the Problems]

 The liquid crystal display device of the present invention is a liquid crystal display device in which two transparent substrates are superposed with a liquid crystal sandwiched therebetween, and polarizing plates are arranged on the front and back sides thereof, and the transparent substrate on the front side is a plastic substrate provided with steps, and The LCD is attached to the panel by aligning the steps with the holes provided in the panel.

Further, in a liquid crystal display device in which two transparent substrates are superposed with a liquid crystal sandwiched therebetween and polarizing plates are arranged on the front and back sides thereof, the front transparent substrate is a plastic substrate having a curved surface. Is.

Further, in a liquid crystal display device in which two transparent substrates are superposed with a liquid crystal sandwiched therebetween, and polarizing plates are arranged on the front and back sides thereof, a front surface of the transparent substrate is formed into a flat surface and a polarizing plate to be stacked thereon is formed. The surface is formed into a curved surface.

Further, in a liquid crystal display device in which a diffuser plate and a daylighting plate are sequentially stacked on the back side of the liquid crystal display, the diffuser plate is printed with ink containing a fluorescent pigment.

Further, in a liquid crystal display device in which a diffuser plate and a daylighting plate are sequentially stacked on the back side of a liquid crystal display, a sheet containing a fluorescent pigment is used as the daylighting plate. Further, the upper surface of the daylighting plate arranged on the back side of the liquid crystal display is printed with the ink containing the fluorescent pigment.

The lighting plate of the present invention is a lighting plate for backlighting arranged on the back side of a liquid crystal display, in which the part that takes in light from the light source and guides it to the liquid crystal display is made of transparent resin, and the other outer peripheral part. Is a two-color molding so as to be a colored resin.

[0023]

[Action]

 According to the liquid crystal display device of the present invention, since the convex portion of the transparent substrate appears on the panel surface and the liquid crystal display comes out in front, the visibility is good and the design is excellent.

Further, when the surface of the transparent substrate or the polarizing plate is formed into a curved surface, the design becomes three-dimensional, the design width is widened and excellent, and the visibility is further improved.

Further, in the case where a fluorescent pigment is used for the light diffusing plate and the daylighting plate, fluorescence is emitted by sunlight or light from a lamp and the amount of light that illuminates the liquid crystal display is increased, so that the display surface becomes bright and the visibility is improved. Further improve.

According to the lighting plate of the present invention, the colored resin that reflects light can be provided on the side surface, light leakage from the side surface is prevented, and the reflectance is increased by increasing the thickness of the colored resin. Since it can be sufficiently increased, the light of the light source lamp can be efficiently guided to the liquid crystal display and the amount of illumination light can be increased. In addition, manufacturing costs are reduced by eliminating the need for post-processing such as printing.

[0027]

【Example】

 An embodiment of this invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In this embodiment, as shown in FIG. 1B, a polarizing plate 3, a transparent substrate 1, a transparent substrate 2 and a polarizing plate 4 are sequentially stacked to form a liquid crystal display 5.

The transparent substrate 1 has a step on the surface and is made of plastic. The transparent substrate 2 is made of plastic or glass. As shown in FIG. 1A, the liquid crystal display 5 formed in this manner is fitted into the holes of the panel 10 with a step, and then the conductive rubbers 7 and 7 and the daylighting plate 6 are placed on the printed circuit board 9. Assembling is completed. In this embodiment, since the surface of the liquid crystal display extends to the panel surface, the visibility is improved.

FIG. 2 shows a second embodiment of this invention. In this embodiment, as shown in FIGS. 2A and 2B, a polarizing plate 3, a transparent substrate 1, a transparent substrate 2 and a polarizing plate 4 are sequentially stacked to form a liquid crystal display 5.

The transparent substrate 1 has a surface formed in a convex curved surface and a stepped portion on its side portion, and is molded by plastic. The transparent substrate 2 is made of plastic or glass.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, as shown in FIGS. 3A and 3B, a polarizing plate 3, a transparent substrate 1, a transparent substrate 2 and a polarizing plate 4 are sequentially stacked to form a liquid crystal display 5. The polarizing plate 3 has a convex curved surface.

FIG. 4 shows an assembled state of the liquid crystal display shown in FIG. 2 or 3. The step formed on the liquid crystal display is fitted into the hole of the panel 10, and then the conductive gums 7, 7 and the lighting plate 6 are placed and the printed circuit board 9 is assembled to complete the assembly. In these examples, the surface of the liquid crystal display has a curved surface, which improves the design and improves the visibility.

FIG. 5A shows a diffuser plate which is a fourth embodiment of the present invention. The surface of the diffuser plate 12 is printed 12a with an ink containing a fluorescent pigment. When such a light diffusing plate is used in the liquid crystal display device having the structure shown in FIG. 8, the light illuminating the liquid crystal display is increased, so that the display surface becomes brighter and the visibility is improved.

FIG. 5B shows a diffuser plate which is a fifth embodiment of the present invention. The diffuser plate 12 is formed of a sheet containing a fluorescent pigment. When such a light diffusing plate is used in the liquid crystal display device having the structure shown in FIG. 8, the light illuminating the liquid crystal display is increased, so that the display surface becomes bright and the visibility is improved.

FIG. 5C shows a liquid crystal display device which is a fifth embodiment of the present invention. In this embodiment, the diffuser plate is not used, and the surface 6 of the daylighting plate 6 on the liquid crystal display side is printed 6b with an ink containing a fluorescent pigment. The parts other than the lighting plate 6 are the same as those shown in FIG. In this embodiment as well, the amount of light applied to the liquid crystal display is increased, so that the display surface becomes brighter and the visibility is improved.

FIG. 6 shows a daylighting plate which is a sixth embodiment of the present invention. This lighting plate is two-color molded so that the surface portion other than the upper surface and the side surface is formed of the colored resin 6c and the other portion is formed of the transparent resin 6d. By using such a daylighting plate 6, it is possible to efficiently guide the light of the light source lamp to the liquid crystal display and increase the illumination light amount.

[0037]

[Effect of the device]

 According to the liquid crystal display device of the present invention, the upper surface of the liquid crystal display can be three-dimensionally combined with the panel design, and the upper surface of the liquid crystal display can be directly exposed on the panel surface. Therefore, the visibility is significantly improved. Moreover, since the front glass is not used, the number of parts is reduced, which leads to cost reduction.

Further, in the case where a fluorescent pigment is used for the light diffusing plate and the daylighting plate, even when the daytime sunlight hits the surface of the liquid crystal display, the sunlight fluoresces to increase the light illuminating the liquid crystal display. Therefore, the display surface becomes bright and good visibility is obtained.

Further, according to the lighting plate of the present invention, it is possible to efficiently guide the light of the light source lamp to the liquid crystal display and increase the illumination light amount.

[Brief description of drawings]

FIG. 1 (a) is a sectional view showing a liquid crystal display device according to a first embodiment of the present invention, and FIG. 1 (b) is a sectional view showing a liquid crystal display in the same embodiment.

FIG. 2A is an exploded perspective view showing a liquid crystal display which is a second embodiment of the present invention, and FIG. 2B is a side view showing the liquid crystal display.

FIG. 3 (a) is an exploded perspective view showing a liquid crystal display which is a third embodiment of the present invention, and FIG. 3 (b) is a side view showing the liquid crystal display.

FIG. 4 is a sectional view showing a liquid crystal display device incorporating the liquid crystal displays of the second and third embodiments of the present invention.

FIG. 5 (a) is a perspective view showing a light diffusing plate according to a fourth embodiment of the present invention, and FIG. 5 (b) is a perspective view showing a light diffusing plate according to the fifth embodiment of the present invention. FIG. 5C is a sectional view showing a liquid crystal display device according to a sixth embodiment of the present invention.

6 (a) is a perspective view showing a daylighting plate according to a sixth embodiment of the present invention, FIG. 6 (b) is a plan view showing the daylighting plate, and FIG. 6 (c) is the same daylighting plate. And FIG. 6D is a side view showing the daylighting plate.

7A is a sectional view showing the structure of a liquid crystal display, and FIG. 7B is a front view showing an example of a display state of the liquid crystal display.

8A is a cross-sectional view showing an example of the structure of a conventional liquid crystal display device, and FIG. 8B is a perspective view showing an example of a light diffusing plate used in the conventional liquid crystal display device.

9A is a sectional view showing an example of an assembled state of a conventional liquid crystal display device, and FIG. 9B is a perspective view showing an example of a daylighting plate of the conventional liquid crystal display device.

FIG. 10 is a cross-sectional view showing another example of an assembled state of a conventional liquid crystal display device.

FIG. 11 is a sectional view showing still another example of an assembled state of the conventional liquid crystal display device.

[Explanation of symbols]

 1 Transparent Substrate 2 Transparent Substrate 3 Polarizing Plate 4 Polarizing Plate 5 Liquid Crystal Display 6 Lighting Plate 7 Conductive Rubber 8 Holder 9 Printed Circuit Board 10 Panel 11 Front Glass 12 Scattering Plate 13 Light Source Lamp

Claims (7)

[Scope of utility model registration request] 1. In a liquid crystal display device in which two transparent substrates are superposed with a liquid crystal sandwiched therebetween and polarizing plates are arranged on the front and back thereof, the front transparent substrate is a plastic substrate provided with a step, and the step is used as a panel. A liquid crystal display device characterized in that a liquid crystal display is attached to a panel in accordance with the provided holes. 2. In a liquid crystal display device in which two transparent substrates are superposed with a liquid crystal sandwiched therebetween and polarizing plates are arranged on the front and back sides, the front transparent substrate is a plastic substrate having a curved surface. Liquid crystal display device. 3. A liquid crystal display device in which two transparent substrates are superposed on each other with a liquid crystal sandwiched therebetween, and polarizing plates are arranged on the front and back sides of the polarizing plate. A liquid crystal display device having a curved surface. 4. A liquid crystal display device in which a diffuser plate and a daylighting plate are sequentially stacked on the back side of the liquid crystal display, wherein the diffuser plate is printed with an ink containing a fluorescent pigment. 5. A liquid crystal display device in which a light diffusing plate and a daylighting plate are sequentially stacked on the back side of the liquid crystal display, wherein a sheet containing a fluorescent pigment is used as the daylighting plate. 6. A liquid crystal display device, wherein an upper surface of a daylighting plate arranged on the back side of the liquid crystal display is printed with an ink containing a fluorescent pigment. 7. In a backlighting plate disposed on the back side of a liquid crystal display, a portion that takes in light from a light source and guides it to the liquid crystal display is made of transparent resin, and the other peripheral portion is made of colored resin. A daylighting plate characterized by being molded in two colors.