JPH03196087A - Information display device - Google Patents

Abstract

PURPOSE:To decrease the pitch of moire fringes to a negligible extent by setting the angle formed by the direction where the stripes of a light control film extend and the direction where the raster of a raster display device extends so as to have a prescribed angle. CONSTITUTION:This information display device is used by disposing the raster display device in a bright part of outdoors, etc., and is used for a vehicle, such as automobile. The above-mentioned device is so constituted as to have the prescribed angle in the angle formed by the direction where the stripes of the light control film 4 extend and the direction where the raster of the raster display device 2 extends. This device is, therefore, shielded periodically at the relatively small pitch by the stripes of the light control film 4 disposed at the intentionally relatively shifted angles and is visible in this state to the user's eyes 5. The moire fringes are thereby made into the pitch of the level equal to the pitch of the raster. Thus, the display patterns are visible while the good visibility is maintained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information display device, and the present invention relates to an information display device, such as a raster display device in an in-vehicle information display system, in which a raster display device is installed in a bright place such as outdoors in a vehicle such as an automobile. The present invention relates to an information display device that is used by disposing.

The configuration of a typical in-vehicle information display system is shown in Figure 1.
In the figure, (1) is a vehicle state detection means, (2) is a raster display having rasters arranged in parallel so that the pitch is a, and (3) is a vehicle detected by the fth vehicle state detection stage). An information display controller (4) generates a video signal to be displayed on the raster display (2) based on the state, and (4) is a light control film (for example, manufactured by Sumitomo 3M Co., Ltd., Product name LCF)
, +51 is a user such as a driver, and (5) is an operation input means.

Vehicle condition detection means +1) to detect the condition of the vehicle and the condition around the vehicle
The signal, information obtained by communication from outside the vehicle, and data stored in any storage medium are processed by an information display controller (3) based on an arbitrary algorithm to generate a video signal. This video signal is displayed on a raster display (2) to provide information to the user (5). In addition, conventional information display devices in which the user (5) specifies the type of information required by the manual operation means (6) are, for example,
As described in Publication No. 117125, a light control film (4) is provided on the display surface of the raster display (2), and the raster of the raster display (2) is controlled by the relative position of the light control film (4). The stretching direction was the same as the stretching direction of the stripes of the light control film (4).

This is because this information display device is used in a vehicle such as an automobile with a raster display placed in a bright place such as outdoors. When the raster display (2) is installed near the center console of a car, strong external light such as sunlight coming through the windshield or door glass will hit the display surface of the raster display (2), causing the display to become distorted. Deteriorates image visibility. Alternatively, at night, the image displayed on the display unit is reflected on the windshield and enters the eyes of the user (5). In order to prevent this, a light control film (4) is provided on the display surface of the raster display (2). For this purpose, the direction in which the raster of the raster indicator (2) extends and the light control film (4)
), and the light control film (4) was not arranged at an angle. That is, no attempt was made to reduce the utilization efficiency of the light control film (4) without any particular purpose.

[Problems to be Solved by the Invention l The conventional information display device is configured as described above,
The direction in which the raster on the raster display extends varies slightly depending on the product due to variations in component performance and adjustment. Furthermore, when fixing the light control film over a raster display, it is difficult to make the direction in which the stripes extend constant.

For this reason, especially when the blind pitch of the light control film is a few minutes to several times the raster pitch,
Moiré fringes were generated, and the pitch of these fringes was so large that it could not be ignored, and the color was sometimes too dark. A display device in which these moire fringes overlap with the display that the raster display is originally intended to display, making the user feel uncomfortable and unable to visually recognize the display pattern while maintaining good visibility. There was a fatal problem.

This invention was made to solve the above-mentioned problems, and its purpose is to provide an information display device that can reduce the pitch of moiré fringes to a negligible extent and can display information without deteriorating the original display. shall be.

[Means for Solving the Problems] The information display device according to the present invention is configured such that the angle between the direction in which the stripes of the light control film extend and the direction in which the raster of the raster display extends forms a predetermined angle. .

[Function l] The raster of the raster display in this invention is periodically interrupted at a relatively small pitch by the stripes of the light control film, which are intentionally arranged at an angle of t1, and enters the user's eyes. . Therefore, moiré fringes are created by raster patterns.Example: An example of the present invention will be described below with reference to the drawings. 1st
The devices (11 to (31), (5), and +61 in the figure are the same as the conventional ones.The light control film (4) according to an embodiment of the present invention is different from the conventional one; The extending direction and the raster extending direction of the raster display (2) are at a predetermined angle β, for example l
They are arranged so as to be offset by about 0°. The raster pitch is k, the stripe pitch is ark,
This light control film (4) is reinforced with a glass plate. FIG. 2 is an explanatory diagram showing the rask (straight line A) and stripes (straight line B) when the raster display (2) and the light control film (4) are viewed from the front. The intersection of the raster (straight line A) and the stripe (straight line B) produces moiré fringes with a pitch of p. These moire fringes are indicated by dotted lines C. In this case, the pitch p of the moire fringes is determined by the angle β formed by the stripes of the raster and the light control film, p = I at k/cos β
1/5QRT ((tan β)” +
(1-k/cos β)2) Here, β is the variable 5k
An example of the calculation result of the pitch p of the moiré fringes when the parameter is
(.

), the vertical axis is the pitch p (mm) of moiré fringes, and k is 1D
It is changed every 0.1 up to 0.5. According to this, the pitch of the moiré fringes decreases as the angle β increases, regardless of the magnitude of k. For example, the raster pitch is 0. The pitch of the stripes of the light control film is, for example, about 0° to several mm. If the pitch p of the moire fringes is made equal to or less than the pitch of the raster, the user will not be bothered by the moire fringes. According to FIG. 3, in order to make p≦number III+, it is desirable that the angle β≧31, and in this example, 10
It's about 30 degrees. On the other hand, if the angle β is too large, it is necessary to cut out the light control film diagonally, resulting in poor efficiency from the viewpoint of the manufacturing process.

Experiments have also shown that when the parameter k is a value far from 1, a mode of moiré fringes with a pitch expressed by a formula different from the above formula occurs. It is not limited. In any case,
In a range where the angle β is relatively small, as the angle β increases, the pitch of the moiré fringes can be reduced to the same extent as the pitch of the raster. Thereby, the user can visually recognize the display pattern without feeling any discomfort while maintaining good visibility.

Furthermore, the same problem is not limited to raster displays that have rasters arranged side by side, but also to those that display images by arranging dots in a line, such as dot matrix type liquid crystal displays. , similar effects can be achieved by applying this invention.

[Effects of the Invention] As described above, according to the present invention, there is a raster display device having rasters arranged in parallel and displaying image information, and a raster display device provided on the display surface of the raster display device and comprising blind-like stripes. The pitch of moire fringes can be ignored by configuring the light control film so that the direction in which the stripes of the light control film extend and the direction in which the raster of the raster display unit extends form a predetermined angle. can be made smaller,
This has the effect of providing an information display device that can display information without deteriorating the original display.

[Brief explanation of drawings]

Figure 1 is a configuration diagram showing a general in-vehicle information display system.
FIG. 2 is an explanatory diagram showing stripes of a raster and a light control film according to an embodiment of the present invention, and FIG. 3 is a nexus angle between the stripes and stripes of a raster and a light control film according to an embodiment of the present invention. It is a graph which shows the relationship between (beta) and the pitch (■) of a moiré fringe. (2)...Lascoux indicator, (4)...Light control film.

Claims (1)

[Claims] A raster display having rasters arranged in parallel and displaying image information, and a light control film provided on the display surface of the raster display and composed of blind-like stripes, wherein the stripes of the light control film An information display device characterized in that the angle between the extending direction of the raster and the extending direction of the raster of the raster display is a predetermined angle.