JPH11337921A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a liquid crystal display capable of always displaying a bright image on a liquid crystal panel properly in accordance with the luminous intensity condition of the use environment and the incident light direction. SOLUTION: A reflection plate provided on the back surface of a liquid crystal panel 1 reflects external incident light on the surface of the liquid crystal panel 1 and illumination light from an illumination light source 6, illuminates the liquid crystal panel 1 from behind, and 1 is displayed, an optical auxiliary board 10 attached to the lower edge of the liquid crystal panel 1 so as to be openable and closable is adjusted by an adjustment hinge 12 to the liquid crystal panel 1.
Is released at a predetermined angle with respect to the optical auxiliary board 10.
Is reflected in the direction of the liquid crystal panel 1 by the light reflecting mirror plate 11 and is incident on the liquid crystal panel 1, so that the illumination light by the reflector provided on the back surface of the liquid crystal panel 1 increases,
The liquid crystal display function is improved, and a bright and easy-to-view image display is enabled. When the optical auxiliary board 10 is closed over the surface of the liquid crystal panel 1, the liquid crystal panel 1 can be protected from damage due to impact and dirt due to dust and foreign matter. become.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display, and more particularly to a reflection type liquid crystal display.

[0002]

2. Description of the Related Art A liquid crystal display is characterized by being extremely thin and lightweight and consuming less power than other display means such as a cathode ray tube.
(Audio and Visual) devices and various information terminal devices. Many of the liquid crystal displays used here are direct-view type liquid crystal displays in which a user directly observes the display, and there are a transmission type and a reflection type as the direct-view type liquid crystal display.

A transmission type liquid crystal display 8 shown in FIG.
Is provided with a backlight 2 on the rear surface of the liquid crystal panel 1 for irradiating the liquid crystal panel 1 with irradiation light, and illuminates the liquid crystal panel 1 with the irradiation light from the backlight 2 to display a display image. On the other hand, in the reflection type liquid crystal display 8 shown in FIG. 5, a reflection plate 5 is disposed on the back of the liquid crystal panel 1 so that natural external light 7 and illumination light from the illumination light source 6 are reflected by the reflection plate 5.
And the reflected light illuminates the liquid crystal panel 1 to display a display image.

At present, transmissive liquid crystal displays are used in many portable AV equipments. However, in order to perform easy-to-view display, it is necessary to increase the light amount of the backlight 2, and the consumption of the backlight 2 is increased. Although the power is increased, the requirements for thin and light weight required for portable AV equipment are satisfied, but low power consumption cannot be realized, and the light intensity of the backlight 2 compared to the external light when used outdoors in a bright outdoor environment However, there is a problem that the displayed image is difficult to see.

[0005]

On the other hand, a reflection type liquid crystal display does not have a backlight, so that power consumption can be reduced. The brighter the liquid crystal panel, the higher the display capability of a display image. Even in a bright outdoor room, a sufficient display function is realized. However, in a reflective liquid crystal display, the display function is greatly affected by the incident light, so if the luminous intensity of the use environment is reduced, the liquid crystal display function is significantly reduced, and even when used indoors, depending on the incident angle of the illumination light. However, there is a problem that the display becomes dark and it is difficult to see.

The present invention has been made in view of the current state of operation of a liquid crystal display as described above, and has as its object to always respond to the luminous intensity condition of the use environment and the incident light azimuth, and always to the liquid crystal panel. It is an object of the present invention to provide a liquid crystal display capable of displaying a bright image.

[0007]

According to a first aspect of the present invention, there is provided a liquid crystal panel, comprising: a reflecting plate provided on a back surface of a liquid crystal panel for reflecting light incident on the surface of the liquid crystal panel; A reflective liquid crystal display for illuminating the panel from behind to display a display image of the liquid crystal panel, the liquid crystal display being mounted on the lower edge of the liquid crystal panel so as to be openable and closable, and allowing the incident light to enter the liquid crystal panel in a released state. The liquid crystal panel further includes an optical auxiliary board that reflects the light toward the surface and covers the surface of the liquid crystal panel in the closed state to protect the liquid crystal panel.

[0008] Similarly, in order to achieve the above object, the invention according to claim 2 is to reflect light incident on the surface of the liquid crystal panel by a reflection plate provided on the back surface of the liquid crystal panel, and to bring the liquid crystal panel from behind. A reflection type liquid crystal display that illuminates and displays a display image of the liquid crystal panel, is attached to the lower edge of the liquid crystal panel so as to be openable and closable, and reflects incident light toward the liquid crystal panel surface in a released state. In the closed state, the optical auxiliary board covers the surface of the liquid crystal panel and protects the liquid crystal panel, and
The liquid crystal display is characterized in that a light emitting unit that emits light toward the liquid crystal panel is provided on a part of the optical auxiliary board.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing the configuration of the present embodiment, and FIG. 2 is a perspective view showing a state in which the optical auxiliary board is closed in FIG.

In the present embodiment, as shown in FIG. 1, an optical auxiliary board 10 is provided on the lower edge of the liquid crystal panel 1 of the liquid crystal display 8A by an adjusting hinge 12 so as to be freely opened and closed with respect to the liquid crystal panel 1. And it is attached so as to be fixed at a desired angular position. On the surface of the optical auxiliary board 10, a light reflecting mirror plate 11 having a high light reflectance is stretched. Further, the optical auxiliary board 10 is rotated at the adjustment hinge 12 so as to approach the liquid crystal panel 1, and the surface of the optical auxiliary board 10 faces the liquid crystal panel 1,
When the liquid crystal panel 1 is covered with the optical auxiliary board 10 and closed, as shown in FIG. 2, the liquid crystal panel 1 is configured to be closed by the optical auxiliary board 10.

In this embodiment having such a configuration, during the image display operation of the liquid crystal display 8A, the optical auxiliary board 10 is rotated by the adjustment hinge 12 so as to be at a desired angle with respect to the liquid crystal panel 1. Then, the rotation is stopped at that position and used as a fixed state. In this state,
The natural extraneous light 7 and the illumination light from the illumination light source 6 enter the liquid crystal display 8A, and a part of the illumination light from the illumination light source 6 and the extraneous light 7a of the natural extraneous light 7 are directly transmitted to the liquid crystal panel 1. The reflected light 17 is reflected by a reflector disposed on the back surface of the liquid crystal panel 1 like reflected light 17 and does not directly enter the observation eye 3 of the user. However, most of the illumination light from the illumination light source 6 and the extraneous light 7b of the natural extraneous light 7 are incident light 13b.
Incident on the light reflecting mirror plate 11 of the optical auxiliary board 10 as
The reflected light 18 from the light reflecting mirror plate 11 enters the liquid crystal panel 1 and is reflected by a reflector disposed on the back surface of the liquid crystal panel 1, and the reflected light 14 directly enters the observation eye 3 of the user. .

For this reason, according to the present embodiment, when the light reflecting mirror plate 11 does not exist, the liquid crystal display 8
The liquid crystal panel 1 of A is illuminated with the illumination light due to the reflection of the low-luminance indirect light by the reflector, and even when the image display of the liquid crystal panel 1 is unclear and difficult to see, the high-luminance reflected light from the light reflection mirror plate 11 As a result, the image is illuminated from the back, so that the image display function of the liquid crystal panel 1 is improved, and clear image display is performed. That is, the indirect light in the room is generally weaker than the direct light, so that the display function of the reflection type liquid crystal display 8A is deteriorated.
The light reflected by the zero light reflecting mirror plate 11 causes the light to enter the liquid crystal panel 1 and illuminates the liquid crystal panel 1 from the back, thereby preventing the deterioration of the display function of the liquid crystal display 8A. In addition, the present embodiment may be used in a usage environment in which light is incident only from above, not only indoors but also outdoors. In such a case, the optical auxiliary board 10 may be used.
Of the liquid crystal panel 1 by the reflected light from the light reflecting mirror plate 11 of FIG.
The liquid crystal panel 1 is illuminated from the back by irradiating light to the liquid crystal panel 1 so that the image display of the liquid crystal display 8A is bright and clear.

Further, the liquid crystal panel 1 of the liquid crystal display 8A is made of a glass plate whose surface is easily stained and easily broken by impact. According to the present embodiment, the optical auxiliary board 10 is adjusted when not in use. The liquid crystal panel 1 is completely closed by the optical auxiliary board 10 by being rotated at the hinge 12 and positioned so as to cover and close the liquid crystal panel 1, and is prevented from being damaged by impact. Is prevented from.

As described above, according to the present embodiment, when the natural extraneous light 7 or the illumination light from the illumination light source 6 enters the optical auxiliary board 10, the reflected light from the light reflecting mirror plate 11 is transmitted to the liquid crystal panel 1. The liquid crystal panel 1 enters and is reflected by a reflector disposed on the back surface of the liquid crystal panel 1 to become illumination light for illuminating the liquid crystal panel 1 from behind, so that it always corresponds to the luminous intensity of the use environment and the incident direction of extraneous light. By improving the display function of the display screen of the liquid crystal display 8A, it is possible to display a bright and high-quality display image. Further, when the liquid crystal display 8A is not used, the optical auxiliary board 10 is closed, so that the liquid crystal panel The liquid crystal panel 1 is closed by the optical auxiliary board 10, so that the liquid crystal panel 1 can be prevented from being damaged by impact, and can be prevented from being stained by dust or foreign matter.

Second Embodiment A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a perspective view showing the configuration of the present embodiment.

Liquid crystal display 8B according to the present embodiment
Then, as shown in FIG. 3, a side edge portion opposite to the side edge portion on which the adjusting hinge 12 of the light reflecting mirror plate 11 is attached is different from the first embodiment already described with reference to FIG. LED1 that emits white light in the vicinity of
5 is provided. In the present embodiment, the light reflecting mirror plate 11 has a slightly concave surface, giving the light reflecting mirror plate 11 a property of condensing reflected light on the liquid crystal panel 1. The configuration of the other parts of the present embodiment is the same as that of the first embodiment already described, and therefore will not be described repeatedly.

In the present embodiment, when the LED 15 of the light emitting section 16 is turned on even when the luminous intensity of the use environment is low or in complete darkness, the outgoing light 18a from the LED 15 directly enters the liquid crystal panel 1, and the LED 15 The outgoing light 18 b deviated from the side to the right is reflected by the light reflecting mirror plate 11, condensed and incident on the liquid crystal panel 1, and the incident light on the liquid crystal panel 1 is reflected by the reflection disposed behind the liquid crystal panel 1. The liquid crystal panel 1 is reflected from the plate to illuminate the liquid crystal panel 1 from the back side, so that the display function of the liquid crystal panel 1 is improved, and a bright high-quality display image is displayed. The other operations of the present embodiment are the same as those of the first embodiment already described, and will not be described again.

As described above, according to this embodiment, in addition to the effects obtained in the first embodiment already described,
Even when the luminous intensity of the use environment of the liquid crystal display 8B is significantly reduced, the liquid crystal panel 1 is directly illuminated by the lit LED 15, and the scattered light from the LED 15 is collected by the light reflecting plate 11 in the direction of the liquid crystal panel 1. Since the liquid crystal panel 1 is also illuminated by the scattered light that has been illuminated, the display function of the liquid crystal panel 1 can be enhanced and a bright high-quality display image can be displayed even in a use environment where the luminous intensity is extremely low. Will be possible.

[0019]

According to the first aspect of the present invention, the external light incident on the liquid crystal panel surface is reflected by the reflector provided on the back surface of the liquid crystal panel, and the liquid crystal panel is illuminated from behind.
When a display image of the liquid crystal panel is displayed, an optical auxiliary board is attached to the lower edge of the liquid crystal panel so as to be openable and closable, and when the optical auxiliary board is released from the liquid crystal panel at a predetermined angle, The extraneous light that enters the optical auxiliary board is reflected toward the liquid crystal panel surface, enters the liquid crystal panel, and is reflected by the reflector provided on the back of the liquid crystal panel. The improved function enables bright and easy-to-view image display. When the optical auxiliary board is closed by covering the surface of the liquid crystal panel, the liquid crystal panel is prevented from being damaged by impact, and is also prevented from being stained by dust and foreign matter. It becomes possible.

According to the second aspect of the invention, in addition to the effect obtained by the first aspect of the invention, light can be made incident on the liquid crystal panel from the light emitting portion provided on a part of the optical auxiliary board. Therefore, it is possible to appropriately increase the amount of light incident on the liquid crystal panel surface, improve the liquid crystal display function, and perform bright and easy-to-view image display, appropriately corresponding to the surrounding low light intensity condition.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a perspective view showing a state where an optical auxiliary board is closed in FIG. 1;

FIG. 3 is a perspective view illustrating a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is an explanatory diagram of a display operation of a transmissive liquid crystal panel.

FIG. 5 is an explanatory diagram of a display operation of a reflective liquid crystal panel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal panel, 3 ... Observation eye, 6 ... Illumination light source, 7a, 7
b: natural extraneous light, 8A, 8B: liquid crystal display, 10
… An optical auxiliary board, 11… a light reflecting mirror plate, 12… adjustment hinge, 15… LED, 16… a light emitting section.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 9/00 335 G09F 9/00 335C

Claims (2)

[Claims] 1. A reflection type of reflecting a light incident on a surface of the liquid crystal panel by a reflector provided on a back surface of the liquid crystal panel, illuminating the liquid crystal panel from behind, and displaying a display image of the liquid crystal panel. A liquid crystal display, wherein the liquid crystal display is attached to the lower edge of the liquid crystal panel so as to be openable and closable, reflects incident light toward the liquid crystal panel surface in a released state, and covers a surface of the liquid crystal panel in a closed state. A liquid crystal display having an optical auxiliary board for protecting a panel. 2. A reflection type of reflecting a light incident on the surface of the liquid crystal panel by a reflector provided on a back surface of the liquid crystal panel, illuminating the liquid crystal panel from behind, and displaying a display image of the liquid crystal panel. A liquid crystal display, wherein the liquid crystal display is attached to the lower edge of the liquid crystal panel so as to be openable and closable, reflects incident light toward the liquid crystal panel surface in a released state, and covers a surface of the liquid crystal panel in a closed state. An optical auxiliary board for protecting the panel, and a light emitting unit that emits light in the direction of the liquid crystal panel is provided on a part of the optical auxiliary board with respect to the liquid crystal display. LCD display.