JPH11183895A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of setting up the luminance of a virtual image to a comparatively high value. SOLUTION: A display device has a light emission type display unit 10 and a liquid crystal(LC) display unit 15 to which display light L from the display unit 10 is projected. The display unit 15 has an LC cell constituted of sealing LC between a pair of translucent substrates, a front side polarizing member formed on the front side of the LC cell and a rear sie polarizing member formed on the rear side of the LC cell. The front side polarizing member in the display unit 15 is provided with a reflection member 26 for reflecting display light L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device for projecting display light of a light emitting type display onto a liquid crystal display.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a display device in which display light of a light-emitting display device such as a fluorescent display tube is projected on a liquid crystal display device, for example, disclosed in Japanese Patent Application Laid-Open No. 8-185133. As shown in FIG. 9, such a display device reflects display light L emitted from a fluorescent display tube 1 by a reflecting mirror 2 and projects the display light L on a liquid crystal display 3. The fluorescent display tube 1 displays the time by day segments, and the display light L projected on the liquid crystal display 3 becomes a virtual image 4, and the observer 5 observes the virtual image 4 (see FIG. 10). On the other hand, the liquid crystal display 3 has a large number of pixels arranged in a matrix and displays a calendar (see FIG. 11). The liquid crystal display 3
As shown in FIG. 12, a front polarizer 8 and a rear polarizer 9 are placed in a liquid crystal cell 7 in which liquid crystal is sealed between a pair of glass substrates 6.
Are bonded together. However, FIG. 12 shows the polarizing plates 8 and 9 separated from the liquid crystal cell 7.

[0003]

However, the virtual image 4
(I.e., the luminance of the display light L 'reflected by the liquid crystal display 3 in the direction of the observer 5) was low, and the visibility was not always excellent. That is, the transmittance of the front polarizing plate 8 is about 50%, and when the display light L is transmitted through the front polarizing plate 7, a part of the display light L is blocked by the front polarizing plate 7. The luminance is about 50%, and there is also display light L ″ that passes through the liquid crystal cell 7. Therefore, there is a problem that the display light L ′ reflected by the liquid crystal cell 7 and reaching the viewer 5 has low luminance. Had. The present invention has been made in view of the above problems, and provides a display device capable of relatively increasing the brightness of a virtual image.

[0004]

According to the present invention, there is provided a display device comprising: a light-emitting display; and a liquid crystal display on which display light of the light-emitting display is projected. The liquid crystal display includes a liquid crystal cell, a polarizing member provided on the front side of the liquid crystal cell, and a reflecting means provided on a front surface of the polarizing member and reflecting the display light.

The present invention is also a display device comprising: a light-emitting display; and a liquid crystal display having a projection unit on which display light of the light-emitting display is projected. It has a liquid crystal cell in which liquid crystal is sealed between a pair of translucent substrates, and a polarizing member provided on the front side of the liquid crystal cell except for the projection unit.

Further, the present invention has a reflection layer provided on at least one inner surface of the pair of light-transmitting substrates and reflecting the display light.

Further, the present invention has a dark cover provided in front of the liquid crystal display.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device is a light-emitting display device 10.
And a liquid crystal display 15 on which the display light L of the light emitting display 10 is projected. The liquid crystal display 15 includes a liquid crystal cell 16 in which a liquid crystal LC is sealed between a pair of translucent substrates 19 and 20.
And a front polarizing member 17 provided on the front side of the liquid crystal cell 16.
And a rear polarizing member 18 provided on the rear side of the liquid crystal cell 16.
And By providing the reflecting means 26 for reflecting the display light L on the front surface of the front polarizing member 17, the display light L passing through the liquid crystal cell 16 can be reduced, and the luminance of the virtual image 28 can be relatively increased.

The display device has a light emitting display 10 and a liquid crystal display having a projection section S on which display light L of the light emitting display 10 is projected. The liquid crystal display includes a liquid crystal cell in which liquid crystal is sealed between a pair of translucent substrates, a front polarizing member provided on the front side of the liquid crystal cell except for a projection unit S on which display light is projected, and a rear side of the liquid crystal cell. A rear polarizing member provided in the
Having. By removing the front polarizing member 17 of the projection unit S, the display light L emitted from the light emitting display 10 is not blocked by the front polarizing member 17, and the brightness of the virtual image 28 can be relatively increased.

Further, the transparent substrates 19, 2 of the liquid crystal cell 16
By providing the reflective layer 31 for reflecting the display light L on the inner surface of the pixel 0, the display light L transmitted through the liquid crystal cell 16 can be reduced, and the luminance of the virtual image 28 can be further increased.

It is desirable to provide a dark cover 29 in front of the liquid crystal display 15, so that the reflection means 26 and the front polarizing member 17 are not noticeable.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a display device for a vehicle will be described below with reference to the accompanying drawings. 1 to 6
Shows a first embodiment.

Reference numeral 10 denotes a fluorescent display tube (light emitting display), which is embedded in a dashboard 11 of the vehicle. The fluorescent display tube 10 displays the speed of the vehicle, and includes a numeric display unit 1 composed of day segments.
2 and a unit display section 13 (see FIG. 2). 14
Is a circuit board, and the circuit board 14 is a fluorescent display tube 10
Is connected to A drive circuit (not shown) is mounted on the circuit board 14, and the drive circuit drives the fluorescent display tube 10.

Reference numeral 15 denotes a liquid crystal display. The liquid crystal display 15 is obtained by bonding a front polarizing plate 17 (polarizing member) and a rear polarizing member 18 to a liquid crystal cell 16 (see FIG. 3). The liquid crystal cell 16 has a nematic liquid crystal LC sealed between a pair of glass substrates 19 and 20 (translucent substrates). The liquid crystal display 15 has a bar graph display section 21 which displays the speed of the vehicle. The bar graph display section 21 is composed of a large number of segments 22 arranged in an annular shape and arc segments 23 (see FIG. 4).

FIG. 5 is a sectional view of a main part of the liquid crystal display. 2
Reference numeral 4 denotes a segment electrode, and the segment electrode 24 is formed on the inner surface of the glass substrate 19. Reference numeral 25 denotes a common electrode. The common electrode 25 is formed on the inner surface of the glass substrate 20.

Reference numeral 26 denotes a reflection film (reflection means).
The reflection film 26 is attached to the front surface of the front polarizing plate 17. The display light L emitted from the fluorescent display tube 10 is reflected by the reflective film 26 in the direction of the observer 27. As shown in FIG. 6, the observer 27 makes the virtual image 28 (that is, the display light L ′ reflected by the reflective film) and the liquid crystal display element 1
5 is visually recognized. Liquid crystal display 15
A light source (not shown) such as a cold-cathode tube is disposed behind the liquid crystal display device, and the liquid crystal display element 15 is illuminated from behind by this light source, so that good visibility can be obtained. 2
Reference numeral 9 denotes a smoke cover (dark cover), which is provided in front of the liquid crystal display.

According to the first embodiment described above, the display light L
Is adhered to the front polarizing plate 17, the display light L emitted from the fluorescent display tube 10 is not blocked by the front polarizing member 17, and the brightness of the virtual image 28 can be relatively increased. In this embodiment, the reflection means is the reflection film 26, but may be a reflection layer printed on the front polarizing plate 17, for example. The reflecting means may be a semi-transmissive film, but is preferably a reflective film 26 which can reduce the display light transmitted through the liquid crystal cell 16 as much as possible. Further, the smoke cover 29 may not be provided, but it is preferable to provide the smoke cover 29 as in this embodiment, so that the reflection film 26 can be made inconspicuous.

FIGS. 7 and 8 show a second embodiment. The second embodiment differs from the first embodiment only in the liquid crystal display 15, and other configurations are the same as those in the first embodiment.

The liquid crystal display 15 has a liquid crystal cell 16 on which a front polarizing plate 17 and a rear polarizing member 18 are bonded. The liquid crystal cell 16 has a nematic liquid crystal LC sealed between a pair of glass substrates 19 and 20. Front polarizing plate 1
Reference numeral 7 has an opening 30 in the projection section S on which the display light L is projected. FIG. 8 is a sectional view of a main part of the liquid crystal display 15. The segment electrodes 24 are provided on the inner surfaces of the glass substrates 19 and 20, respectively.
And a common electrode 25 are formed. Reference numeral 31 denotes a light-shielding layer, and the light-shielding layer 31 is made of chromium (Cr). The light shielding layer 31 is formed on the inner surface of the glass substrate 19 by a vapor deposition method. Display light L emitted from the fluorescent display tube 10
Is the viewer 2 due to the reflection layer 31 and the front surface of the glass substrate 19.
7 is reflected. It should be noted that the glass substrate 19 is sufficiently thin, so that even if the display light L is reflected by the reflection layer 31 and the glass substrate 19, there is no possibility that the virtual image 28 becomes a double image.

According to the second embodiment described above, the projection section S of the fluorescent display tube 10 on which the display light L is projected is formed by the front polarizing plate 1.
7, the display light L is not blocked by the front polarizer 17, and the virtual image 28 can be displayed with relatively high luminance. Further, by providing the reflective layer 31, the display light L can be reflected in the direction of the observer 27, and the display light L does not pass through the liquid crystal cell 16, so that the brightness of the virtual image 28 can be further increased. it can. Although the reflection layer 31 was made of chromium, for example, nickel (N
i). Further, although the reflection layer 31 is formed on the glass substrate 19, it may be formed on the glass substrate 20.

Although the light emitting display of the first and second embodiments is the fluorescent display tube 10, it is a liquid crystal display having a backlight or a display using a light emitting diode or an electroluminescent element. Is also good.

[0023]

According to the present invention, there is provided a display device having a light emitting display and a liquid crystal display on which display light of the light emitting display is projected, wherein the liquid crystal display comprises a liquid crystal cell; It has a polarizing member provided on the front side of the liquid crystal cell, and a reflecting means provided on the front surface of the polarizing member and reflecting the display light, and can reduce display light transmitted through the liquid crystal cell. , The brightness of the virtual image can be relatively increased.

The present invention is also a display device comprising: a light-emitting display; and a liquid crystal display having a projection unit onto which display light of the light-emitting display is projected, wherein the liquid crystal display comprises: A liquid crystal cell in which liquid crystal is sealed between a pair of light-transmitting substrates, and a polarizing member provided on the front side of the liquid crystal cell except for the projection unit, wherein the front polarization member of the projection unit is removed. Thereby, the display light emitted from the light emitting display does not pass through the front polarizing member, and the brightness of the virtual image can be relatively increased.

Further, the present invention has a reflection layer provided on at least one inner surface of the pair of translucent substrates to reflect the display light, and reduces the display light transmitted through the liquid crystal cell. And the luminance of the virtual image can be further increased.

Further, the present invention has a dark cover provided in front of the liquid crystal display, and the reflection means and the front polarizing member are not noticeable.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a front view of the fluorescent display tube showing the embodiment.

FIG. 3 is an exploded perspective view of the liquid crystal display showing the embodiment.

FIG. 4 is a front view of the liquid crystal display showing the embodiment.

FIG. 5 is a sectional view of a principal part of the liquid crystal display showing the embodiment.

FIG. 6 is a display explanatory diagram of the liquid crystal display showing the embodiment.

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

FIG. 8 is a sectional view of an essential part of the liquid crystal display showing the embodiment.

FIG. 9 is a sectional view showing a conventional example.

FIG. 10 is a display explanatory diagram showing a conventional example.

FIG. 11 is a display explanatory diagram showing a conventional example.

FIG. 12 is an exploded view showing the conventional example.

[Explanation of symbols]

 Reference Signs List 10 fluorescent display tube (light-emitting display) 15 liquid crystal display 16 liquid crystal cell 17 front polarizer (polarizing member) 18 rear polarizer 19 glass substrate (light-transmitting substrate) 20 glass substrate (light-transmitting substrate) 26 reflection Film (reflection means) 31 Reflective layer L Display light LC Nematic liquid crystal (liquid crystal)

Claims (4)

[Claims] 1. A display device comprising: a light emitting display; and a liquid crystal display on which display light of the light emitting display is projected, wherein the liquid crystal display includes a liquid crystal cell and a liquid crystal cell. A display device comprising: a polarizing member provided on a front side; and a reflecting unit provided on a front surface of the polarizing member and reflecting the display light. 2. A display device comprising: a light-emitting display; and a liquid crystal display having a projection unit onto which display light of the light-emitting display is projected. A display device comprising: a liquid crystal cell in which liquid crystal is sealed between conductive substrates; and a polarizing member provided in front of the liquid crystal cell except for the projection unit. 3. The display device according to claim 2, further comprising: a reflection layer provided on at least one inner surface of the pair of light-transmitting substrates and reflecting the display light. 4. The display device according to claim 1, further comprising a dark cover provided in front of the liquid crystal display.