JPH08292435A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To provide a liquid crystal display device which can make a color display of not only information obtained by a liquid crystal display element, but also information on a constant pattern such as characters and a picture. CONSTITUTION: This liquid crystal display device makes the display with the light transmitted through a liquid crystal display element 3 by irradiating the liquid crystal display element 3 with the visible light emitted by an incorporated light source 1 (1a and 1b). In addition to the light source 1, the device is provided with a light emitting lamp 21 which emits only light having specific wavelength, and a member 22 coated at least partially with a fluorescent pigment which develops a fluorescent color by reacting to the specific wavelength of the light emitted by the light emission lamp 21 is arranged between the light source 1 and liquid crystal display element 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used in electronic equipment and the like.

[0002]

2. Description of the Related Art A conventional edge light type liquid crystal display device will be described below with reference to FIG. Here, FIG.
FIG. 3 is a side cross-sectional explanatory view showing the outline of the configuration of a conventional edge light type liquid crystal display device.

A conventional edge light type liquid crystal display device includes a tungsten lamp 1 which emits light from a light source, a light guide plate 2 which is formed of a transparent material such as an acrylic plate, and transmits light according to given information. A liquid crystal display element 3 for shutting off,
A transparent protective cover 4 for protecting the surface of the liquid crystal display element 3 is provided.

In the above structure, the tungsten lamp 1 and the current-carrying terminals of the liquid crystal display element 3 are mounted and supported on the substrate 5, and the protective cover 4 is mounted on the cabinet 6. Further, the inclined surface 2a formed on the back surface of the light guide plate 2 is cut in a mountain shape so that the light from the tungsten lamp 1 is uniformly applied to the liquid crystal display element 3. Further, a reflection plate 7 is provided for allowing the light from the tungsten lamp 1 to effectively enter the light guide plate 2.

In the liquid crystal display device configured as described above, the light emitted from the tungsten lamp 1 is incident on the light guide plate 2 by the reflection plate 7, and the inclined surface 2a formed on the back surface of the light guide plate 2. The liquid crystal display element 3 is irradiated with the light by being reflected by and guided to the front surface side (the liquid crystal display element 3 side). Then, the irradiation light is transmitted through the liquid crystal display element 3,
By shutting off, desired information such as letters and numbers can be displayed.

[0006]

In the above-mentioned conventional liquid crystal display device, not only can the information content based on the signal given to the liquid crystal display element 3 be displayed, but the display character color is the backlight (tungsten lamp 1). Since the color is the color when the light of (1) is blocked (usually black), it is necessary to change the color of the backlight when performing multicolor display.

That is, two tungsten lamps 1 are arranged on one end side of the light guide plate 2 and two tungsten lamps 1 are arranged on the other end side thereof, and each pair is covered with a red color cap and a green color cap. It was necessary to display the lamp covered with the color cap by changing the color of the backlight by turning on the lamp covered with the red color cap in a special use state.

In this case, since the unwanted light component is absorbed by the color cap, only a part of the light component of the light emitting source is effectively used, and the conversion efficiency from electric power to effective light is extremely low. There was a problem.

Therefore, a display device capable of efficiently multicoloring the background illumination according to the display area is disclosed in Japanese Patent Laid-Open No. 4-100.
It is proposed in Japanese Patent Publication No. 084. As shown in FIG. 10, this is a lamp 11 that emits more ultraviolet light than visible light.
Between the lamp 11 and the liquid crystal display panel 12, and fluorescent substances 13a to 13c that emit fluorescence by the ultraviolet light.
Are arranged according to the display area.

However, in the display device proposed in Japanese Patent Laid-Open No. 4-100084, since only the lamp 11 which emits more ultraviolet light than visible light is provided as a backlight, it is formed on the liquid crystal display panel 12. The displayed information (image) can be displayed in multiple colors in a fantastic color, but there is a problem that other information cannot be displayed.

The present invention has been made in view of the above points, and not only the information obtained by the liquid crystal display element but also a liquid crystal display capable of color-displaying information of a fixed pattern such as characters and pictures. The purpose is to provide a device.

[0012]

A liquid crystal display device according to the present invention is a liquid crystal device in which visible light emitted from a built-in light source is applied to a liquid crystal display element and a display is performed by the transmitted light obtained by the liquid crystal display element. In the display device, in addition to the above light source,
A light emitting lamp that emits only light having a specific wavelength is provided, and at least a part of the light source and the liquid crystal display element emits a fluorescent color in response to a specific wavelength emitted from the light emitting lamp. A member coated with a fluorescent pigment is arranged.

[0013]

In the liquid crystal display device of the present invention, not only can the display be performed by the light transmitted through the liquid crystal display element by using the visible light source, but also the fluorescent pigment emitted by the light emitting lamp can have the specific wavelength. Thus, it is possible to emit a fluorescent color and display information of a fixed pattern coated with the fluorescent pigment.

[0014]

EXAMPLE An example of the liquid crystal display device of the present invention will be described below.
For example, a liquid crystal display device used for an operation display portion of a VTR (video tape recorder) will be described with reference to FIGS. 1 to 6, but the same parts as those of the conventional example will be denoted by the same reference numerals and the description thereof will be omitted.

Here, FIG. 1 is an exploded perspective view showing the liquid crystal display device of this embodiment, FIG. 2 is a side sectional view showing the liquid crystal display device of this embodiment, and FIG. 3 is a liquid crystal display device of this embodiment. To V
An explanatory cross-sectional side view of an essential part showing an example used for the operation display unit of TR,
FIG. 4 is an explanatory view showing an example of various mode displays by liquid crystal display in the liquid crystal display device of the present embodiment, FIG. 5 is an explanatory view showing an example of mode display by fluorescent display in the liquid crystal display device of the present embodiment, and FIG. FIG. 7 is an explanatory diagram showing an example in which a liquid crystal display and a fluorescent display are superimposed and displayed in the liquid crystal display device of the present embodiment.

The liquid crystal display device of this embodiment is shown in FIGS.
As shown in, in addition to the configuration of the conventional liquid crystal display device described above, a black light 21 that emits light having a wavelength near 360 nm can be attached to the reflection plate 7, and
Between the light guide plate 2 and the liquid crystal display element 3, there is provided a transparent sheet 22 directly printed with a fluorescent pigment that emits a fluorescent color in response to light having a wavelength near 360 nm.

The tungsten lamp 1a with the green cap and the tungsten lamp 1b with the red cap are respectively provided with holes 5a in the substrate 5,
The black light 21 inserted into the hole 5a of the reflector 7 is inserted into the power supply terminal 5 of the substrate 5.
It is clamped by c. In addition, the energizing terminal 3a of the liquid crystal display element 3
Is inserted into the hole 5d of the substrate 5 and then soldered and attached.

In the above structure, the tungsten lamp 1
Since a and 1b need to reliably guide light in terms of the amount of light and brightness, the inclined surface 2a is formed on the back surface of the light guide plate 2 to prevent the occurrence of uneven brightness. Since it is sufficient, the shape of the light guide plate 2 does not matter.

The liquid crystal display device having the above-described structure is used for the VT.
When used in the R operation display section, as shown in FIG. 3, the transparent resin window 3 attached to the opening of the front operation panel 31.
The liquid crystal display can be confirmed via the display 2.

When the power of the VTR is turned on, the tungsten lamp 1a is turned on, and the green light is applied to the liquid crystal display element 3 through the light guide plate 2 and the sheet 22. Desired information can be displayed by transmitting and blocking this irradiation light by the liquid crystal display element 3.

Next, when the operation mode of the VTR is changed,
For example, when the recording button is pressed, the tungsten lamp 1a is turned off and the tungsten lamp 1b is turned on. The red light from the tungsten lamp 1b is applied to the liquid crystal display element 3 via the light guide plate 2 and the sheet 22 as in the case of the green light, and liquid crystal display is performed.

Further, when the preset recording mode is set, the tungsten lamps 1a and 1b are turned off and the black light 21 is turned on. The light emitted from the black light 21 reaches the sheet 22 through the light guide plate 2,
Since the fluorescent pigment printed on the sheet 22 is stimulated to develop color, the colored light transmits through the liquid crystal display element 3 and the content (a fixed pattern such as letters or pictures) printed with the fluorescent pigment is displayed in color. Will be done.

As a result, not only the display of various modes by the liquid crystal display element 3 as shown in FIG. 4 but also the content printed with the fluorescent pigment as shown in FIG. 5 (reservation-character indicating inoperable) Can be displayed. further,
As shown in FIG. 6, the display by the transmitted light of the liquid crystal display element 3 (the counter display indicating the recording time) and the display by the emission of the printed fluorescent pigment (the character display indicating the absence recording) are overlapped and displayed. As a result, a multicolor display with a wide variety of variations is possible. At this time, the black light 21 may be used as a backlight of the liquid crystal display element 3 by removing the visible light cut filter and emitting visible light.

The fluorescent pigment is Y ₂ O ₂ S: Eu.
(Red), Sr ₅ (PO ₄ ) Cl: Eu (blue), Zn
_It can be formed by mixing materials containing ₂ GeO ₄ : Mn (green). Further, since the fluorescent pigment is transparent or has a color close to white, it is hardly visible even when it is illuminated by the tungsten lamp 1. Furthermore, 13 basic colors can be produced by the fluorescent paint, which is sufficient for practical use.

In the above-described embodiment of the present invention, the one in which the color display of one pattern can be performed in addition to the display by driving the liquid crystal display element has been described. Another embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The liquid crystal display device of this embodiment is shown in FIGS.
As shown in FIG. 5, in addition to the configuration of the above-described embodiment of the present invention, an ultraviolet lamp 41 that emits ultraviolet light having a specific wavelength on the side opposite to the black light 21 of the reflection plate 7.
The light guide plate 2 and the liquid crystal display element 3 can be mounted.
And a transparent sheet 42 on which a fluorescent pigment that emits a fluorescent color in response to light having the above-mentioned specific wavelength is directly printed. The ultraviolet lamp 41 inserted in the hole 7b of the reflection plate 7 is sandwiched by the power supply terminals 5e of the substrate 5.

In the liquid crystal display device constructed as described above, the tungsten lamp 1 and the black light 21 are turned off and the ultraviolet lamp 41 is turned on, so that the light emitted from the ultraviolet lamp 41 passes through the light guide plate 2. After reaching the sheet 42, the fluorescent pigment printed on the sheet 42 is stimulated to develop color, and thus the colored light passes through the liquid crystal display element 3 and the content (characters, pictures, etc.) on which the fluorescent pigment is printed. Will be displayed in color.

As a result, in addition to the monochrome liquid crystal display by the light from the tungsten lamp 1 and the color display by the fluorescence in response to the light from the black light 21, the color display by the fluorescence in response to the specific ultraviolet light from the ultraviolet lamp 41. It becomes possible to realize a richer display.

The light guide plate 2 in this embodiment may be molded from a general methacrylic resin, but it is necessary to select a material that does not contain an ultraviolet absorber.

As described above, in the embodiment of the liquid crystal display device of the present invention, it is necessary to display various contents in a small display area with the miniaturization and higher functionality of electronic equipment such as VTR. Very effective in case,
Display contents can be displayed easily and easily.

[0031]

Since the liquid crystal display device of the present invention is configured as described above, not only can the display be performed by the light transmitted through the liquid crystal display element using the visible light source, but also the light emitted from the light emitting lamp. It is possible to display multiple patterns of information at the same position because the fluorescent pigment emits a fluorescent color by the light having a specific wavelength and the information of a certain pattern coated with the fluorescent pigment can be displayed. Is.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a side sectional explanatory view showing an embodiment of the liquid crystal display device of the present invention.

FIG. 3 is a side cross-sectional explanatory view of essential parts showing an example in which the liquid crystal display device of one embodiment of the liquid crystal display device of the present invention is used as an operation display portion of a VTR.

FIG. 4 is an explanatory diagram showing an example of various mode displays by liquid crystal display in the liquid crystal display device of one embodiment of the liquid crystal display device of the present invention.

FIG. 5 is an explanatory diagram showing an example of mode display by fluorescent display in the liquid crystal display device of one embodiment of the liquid crystal display device of the present invention.

FIG. 6 is an explanatory diagram showing an example in which a liquid crystal display and a fluorescent display are overlapped and displayed in the liquid crystal display device of the embodiment of the liquid crystal display device of the present invention.

FIG. 7 is an exploded perspective view showing another embodiment of the liquid crystal display device of the present invention.

FIG. 8 is a side sectional explanatory view showing another embodiment of the liquid crystal display device of the present invention.

FIG. 9 is an explanatory side cross-sectional view schematically showing the configuration of a conventional edge light type liquid crystal display device.

FIG. 10 is a side cross-sectional explanatory view showing another conventional liquid crystal display device.

[Explanation of symbols]

 1 Tungsten lamp 2 Light guide plate 3 Liquid crystal display element 4 Protective cover 5 Substrate 6 Cabinet 7 Reflector 21 Black light 22 Sheet with fluorescent light emitting layer 41 UV lamp 42 Sheet with fluorescent light emitting layer printed

Claims (3)

[Claims] 1. A liquid crystal display device for irradiating a liquid crystal display element with visible light emitted from a built-in light source, and displaying by using transmitted light obtained by the liquid crystal display element, in addition to the light source, A fluorescent pigment that emits fluorescent light in response to a specific wavelength emitted from the light emitting lamp is provided at least in part between the light source and the liquid crystal display element while providing a light emitting lamp that emits only light having a wavelength. A liquid crystal display device in which a member coated with is disposed. 2. The liquid crystal display device according to claim 1, wherein the light emitting lamp is a black light which emits light having a wavelength of about 360 nm. 3. The liquid crystal display device according to claim 1, wherein the light emitting lamp is an ultraviolet lamp that emits light having a specific wavelength.