JPS59202487A - Liquid crystal display for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device for a vehicle in which a reflective liquid crystal display device is installed at a predetermined position in a vehicle interior.

Recently, the use of electronic devices such as automobile meters and gauges has progressed rapidly, but the visibility of conventional displays using light emitting diodes and the like during daytime is poor, so the development of displays using liquid crystals has progressed. There is. In particular, reflective liquid crystal displays are very suitable for use in vehicles because visibility improves as the surroundings become brighter.

However, since the liquid crystal is a light-receiving element, external illumination is essential in shadows and at night.

Conventionally, most displays of this type have been illuminated from the side of the liquid crystal, as typified by digital clocks, and this method has the problem of uneven display. In addition, when lighting a liquid crystal, it is necessary to take into consideration the viewing angle dependence of the liquid crystal (the appearance varies greatly depending on the viewing angle). In other words, as shown in Fig. 1, if the viewing angle with the best viewing angle dependence for the liquid crystal display A is θ, then if the illumination is placed at the position θ-θ' (then the illumination with the best contrast will be However, when the illumination is placed in such a position, there is a problem in that the illumination light reflected by the liquid crystal surface glass of the liquid crystal display enters the driver's eyes, making it difficult to see the display.

The present invention has been made in view of the above problems, and its purpose is to improve the illumination of a reflective liquid crystal display by reducing display unevenness (and improving the contrast of the display), and to improve the illumination reflected by the liquid crystal surface glass. To provide a liquid crystal display device for a vehicle in which light does not enter the eyes of a driver.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 is an electrical wiring diagram showing the electrical wiring part of one embodiment. Reference numeral 100 denotes a liquid crystal display device, which includes a display section 1 including a reflective liquid crystal display 11, an input section 21 for inputting signals such as brake on/off, small lamp on/off, etc.
The illumination section 2 includes a lamp 22 as a light emitting means. 4 closes when you step on the brake and brake light 4
1 is a brake switch that lights up, and 5 is a lighting switch that lights up a small lamp 51. 6 is a battery mounted on the vehicle. Therefore, the brake switch 4 or the lighting switch 5 is turned on. Then, the lamp 22 is turned on in response to power supplied from the on-vehicle battery 6. Further, the liquid crystal display device 100 is entirely held in an appropriate positional relationship by an outer container 3, as shown in FIG. This outer container 3 is installed on the rear tray, and the liquid crystal display 11
is for detecting and displaying rear obstacles (the detecting section is not shown). FIG. 4 is a plan view thereof. Here, as is clear from the positional relationship between the lamp 22, the liquid crystal display 11, and the driver, the illumination by the lamp 22 prevents the light reflected from the liquid crystal surface glass from entering the driver's eyes when the driver is seated. It looks like this.

Further, as shown in FIG. 5, the illumination means 200 has a transparent acrylic cover 23 on the front surface of the lamp 22, and a light shielding part 24 that prevents the transparent light from the lamp 22 from directly entering the eyes. have.

According to the above configuration, since the lamp 22 is disposed in front of the liquid crystal display 11 in plan view, a clear display contrast can be obtained due to the viewing angle dependence of the liquid crystal. Furthermore, due to the positional relationship between the lamp 22, the liquid crystal display 11, the driver, and the effect of the light shielding part 24, the illumination from the lamp 22 does not directly or indirectly enter the driver's eyes, making the display easy to see. I can do it.

In the above embodiment, the outer container 3 is installed on the rear tray, but depending on the installation location, it is often impossible to adopt the configuration shown in FIG. 3 due to restrictions on the outer container. 6 and 7 (al, (bl) are examples in which the outer container is installed in a place where there are restrictions on the outer container, for example, in front of the driver's seat.

In FIG. 6, 22a, lla, and 3a are a lamp, a liquid crystal display, and an outer container, respectively, and 25 is a light guide material such as an optical fiber. Therefore, the front surface of the liquid crystal display 11a can be illuminated by the illumination light from the lamp 22a via the light guide material 25.

Figure 7 (al, (bl), (al is its front view,
(b) is a schematic cross-sectional view of 22b, llb, 3
b is a lamp, a liquid crystal display, an outer container, and 26 is a mirror. Note that, as shown in FIG. 7(a), the lamp 22b
There are three mirrors 26, and the mirror 26 has an elongated shape.

Therefore, the front surface of the liquid crystal display 11b can be illuminated by the illumination light from the lamp 22b via the mirror 26.

In the embodiments shown in FIGS. 6 and 7, ta+ and (b), the light emitting means illuminates the liquid crystal display from above, so when the driver is seated,
The illumination light reflected by the liquid crystal surface glass does not enter the driver's eyes.

In the above embodiment, the liquid crystal display is illuminated from below or above, but it may be arranged laterally, or they may be combined. Also,
Although a lamp is used as the light emitting means, a fluorescent lamp, a light emitting diode, etc. may also be used.

As described above, in the present invention, since the liquid crystal display is illuminated from the front, it is possible to reduce display unevenness and improve the display contrast.In addition, the illumination light reflected by the liquid crystal surface glass can be reduced. This has the excellent effect of making the display easier to see while keeping it out of the driver's eyes.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram for explaining the viewing angle dependence of liquid crystal, Fig. 2 is an electrical wiring diagram showing an electrical connection part of an embodiment of the present invention, and Fig. 3 is a schematic diagram showing an embodiment of the invention. 4 is a plan view of the structure shown in FIG. 3, FIG. 5 is a sectional view showing the detailed structure of the illumination means, and FIG. 6 is a schematic sectional view showing another embodiment of the present invention. 7(a) and 7(b) are a front view and a schematic sectional view showing another embodiment of the present invention. 11...Liquid crystal display, 22...Lamp, 200...
・Lighting means. Representative Patent Attorney Takashi Okabe Figure 3, Figure 4, Figure 6, Figure 5, 25, Figure 7

Claims (2)

[Claims] (1) In a liquid crystal display device for a vehicle in which a reflective liquid crystal display is installed at a predetermined position in a vehicle interior, an illumination means for illuminating the liquid crystal display from the front is provided, and the illumination light of the illumination means illuminates the A liquid crystal display device for a vehicle, characterized in that the liquid crystal display device is provided at a position where the light is reflected by the liquid crystal surface glass of the liquid crystal display device and passes through the driver's eyes when the driver is seated. (2) The vehicle according to claim 1, wherein the illumination means has a light shielding part that prevents the illumination light from directly entering the driver's eyes when the driver is seated. liquid crystal display device.