JPH05119315A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a liquid crystal display device which is light in weight and has the high display efficiency to allow easy viewing even at night by using an arrayed layer type liquid crystal sheet of a nematic curve system. CONSTITUTION:The main display part 3a of the liquid crystal sheet 3 of the nematic curve system arrayed layer (NCAP) type is illuminated with both of the reflected light from a front surface and a back light. The auxiliary display part 3a disposed on the peripheral edge of the main display part 3a is illuminated with incoming reflected light in the day time and is illuminated with the light from the back light which is passed through a light guiding wall layer provided on the inside wall of a housing 1 and is reflected from the peripheral edge part where the housing 1 is connected to a front cover in dark environment, such as at night. The display efficiency is thereby enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device mounted on an automobile for displaying vehicle speed, rotation speed, etc., and more particularly to a liquid crystal display device using NCAP liquid crystal.

[0002]

2. Description of the Related Art Conventionally developed automobile display devices using a liquid crystal panel include, for example, a transillumination type liquid crystal panel having a display segment for displaying information in an instrument housing and a liquid crystal panel behind the liquid crystal panel. This is a structure in which the illuminating means to be arranged is internally provided and when the illuminating means is turned on, the display information of the liquid crystal plate is displayed by the transmissive illumination.

[0003]

However, in the liquid crystal display panel used in such a conventional display device, a liquid crystal cell in which a liquid crystal is sealed in a gap between at least two glass plates parallel to each other is used. Therefore, the weight of the liquid crystal display plate itself is increased by using at least two glass plates, and the conventional liquid crystal display plate is heavy.

Therefore, in the present situation where the weight of a small-capacity vehicle such as a battery car is being reduced, it is required to reduce the weight of the liquid crystal display panel used in the equipment.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to meet such a demand, and its first object is to reduce the weight of a liquid crystal display device by using NCAP (nematic curvilinear alignment layer) liquid crystal. An object is to provide a liquid crystal display device using a sheet. Secondly, since the display efficiency of the liquid crystal display device using the NCAP liquid crystal sheet is higher in the reflective illumination method than in the transmissive illumination method, it is possible to improve the display efficiency by using the reflective illumination together even in a dark place such as at night. It is to provide a liquid crystal display device capable of

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the embodiments shown in the drawings.

In FIGS. 1 to 3, 1 is an upper housing, 2 is a lower housing, and an NCAP that can be displayed from the opening side of the upper housing 1 in the internal space created by the upper housing 1.
(Nematic curve type alignment layer) A liquid crystal sheet 3 is arranged,
Further, a light diffusing plate 4 is attached and fixed to the back surface of the NCAP liquid crystal sheet 3 by a retainer 5 and a mounting screw 6.

Further, the NCAP liquid crystal sheet 3 has a structure shown in FIG.
As shown in FIG. 3, a main display portion 3a for displaying the vehicle speed and the like is formed in the central portion thereof, and a plurality of sub display portions 3b for displaying warnings and the like are formed in the peripheral portion thereof.

7 is arranged behind the light diffusing plate 4, and NC
This is a circuit board on which a circuit for driving the AP liquid crystal is mounted. On the circuit board 7, an illumination lamp 8 and a reflector 9 of the illumination lamp are arranged. 10 is NCA
A transparent front cover is arranged in front of the P liquid crystal sheet 3 so as to close the front opening 11 of the upper housing 1, and the upper housing 1 is made of a resin made of a transparent material, The surface of the housing 1 is coated with, for example, a white paint layer 12 having excellent light reflectivity, and the surface of the white paint layer 12 is coated with an arbitrary surface coating 13. In this embodiment, in order to prevent the white paint layer 12 applied to the surface of the housing 1 from being visible from the outside when the line of sight from the front of the display device is in the α range, the surface of the housing 1 is not visible. The same coating 13 ′ as the surface coating 13 is applied to the portion within the α range.

The structure of this embodiment is as described above. Next, its operation will be described. In the liquid crystal display device having such a structure, when an information signal is inputted to the NCAP liquid crystal sheet 3, the NCAP is formed. A display is appropriately made by each sub-display portion 3b and main display portion 3a of the liquid crystal sheet 3,
In the daytime, this display surface is displayed by the reflection illumination by the external light, and the display by the NCAP liquid crystal is effectively performed without requiring the internal illumination. In particular, the NCAP liquid crystal is advantageous because it has an excellent reflective display property.

In a dark place such as at night, the illumination lamp 8
When the light is turned on, the light emitted from the illumination lamp 8 is emitted by the light diffusing plate 4 substantially uniformly over the entire surface of the light diffusing plate 4, and a part of the received light is guided to the front cover 1. The light received and received by the front cover 1 is reflected by the white paint layer 12 while the front cover 1
To the front opening. The light reaching the opening of the front cover is radiated toward the surface of the NCAP liquid crystal sheet, and as a result, the NCAP liquid crystal sheet 3 is reflected and displayed, and the surface of the light diffusing plate 4 is also transmitted and illuminated.

Therefore, in a dark place such as at night, the NCAP liquid crystal sheet is displayed by the illumination action of both the transmission illumination and the reflection illumination. However, since the reflection illumination action is particularly large, the NCAP liquid crystal sheet is also displayed in the dark place. The display on the liquid crystal sheet will be excellent.

Further, in this embodiment, the main display portion is formed in the central portion of the display surface, and the plurality of sub-display portions are formed in the peripheral portion thereof, which are arranged on the back side of the display plate in a dark place. The light source 8 has a structure in which the main display portion is transmitted and illuminated, and the sub display portion is reflected and illuminated by a light guiding action using the housing as a light guide body. The miniaturization and the economical efficiency are improved.

Furthermore, in this embodiment, even if the line of sight is shifted within the range of α, the white paint layer 12 applied to the surface of the housing 1 is hidden by the paint 13 ', so that the white paint layer 12 is visible. It does not hinder the visibility.

[0015]

As described above, the present invention is provided with the NCAP liquid crystal sheet 3 which is arranged so as to be displayed through the opening 11 of the housing 1 and in which information is displayed by energizing the driving voltage. This is a liquid crystal display device in which the display surface of the NCAP liquid crystal sheet 3 is reflected and illuminated from the front surface. According to this, the liquid crystal display plate is an NCAP liquid crystal display plate. Therefore, the degree of freedom in design is improved, and the manufacturing economy is improved. Further, since the reflective illumination is used together not only in the daytime but also in the nighttime, the effect of significantly improving the visibility of the NCAP liquid crystal can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part in FIG.

FIG. 3 is a front explanatory view of a liquid crystal display device according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Upper housing 2 ... Lower housing 3 ... NCAP liquid crystal sheet 4 ... Light diffusing plate 5 ... Holder 6 ... Mounting screw 7 ... Circuit board 8 ... Lighting lamp 9 ... Reflector 10 ... Front cover 11 ... Opening 12 ... White paint Layer 13 ... Surface coating

Claims (2)

[Claims] 1. An NCAP liquid crystal sheet (3), which is arranged so as to be displayable through an opening (11) of a housing (1) and on which information is displayed by energizing a driving voltage, the NCAP liquid crystal. A liquid crystal display device characterized in that the display surface of the sheet (3) is reflected and illuminated from the front surface. 2. An NCAP liquid crystal sheet (3), which is arranged so as to be displayable through an opening (11) of a housing (1) and on which information is displayed by driving a drive voltage, the NCAP liquid crystal. The main display part (3a) is provided in the center of the display surface of (3), and a plurality of sub-display parts (3b) are provided on the periphery thereof, and the main display part (3a) is transmitted from the rear of the NCAP liquid crystal sheet (3). Illuminated, the sub-display (3
b) is a liquid crystal display device characterized by being reflected and illuminated from the front surface thereof.