JPS58136080A - Liquid crystal display to be carried on 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 provides an apparatus for displaying a vehicle-mounted sorter on a liquid crystal display.
A liquid crystal display device for a vehicle that uses a simple structure to prevent the color display portion from appearing hidden even when the display drive is not performed when a white display portion and a color display portion are provided in one liquid crystal cell. Regarding.

Conventionally, as a device that displays meters such as speed and engine rotation speed using a liquid crystal, for example, the 11A
There is something like this.

In Fig. 1, numeral 1 is an ometer panel, and the meter panel has a predetermined display pattern (numerical pattern, graph pattern, graphic pattern, etc.) depending on the arrangement of electrode segments.
For example, 2 is a liquid crystal cell for speed display, 3 is a liquid crystal cell for engine rotation display, and 4 is a liquid crystal cell for displaying engine speed.
5 is a liquid crystal cell for displaying an AT shift position.

In such a liquid crystal display device for an on-vehicle meter, as is clear from FIG. 1, each of the liquid crystal cells 2 to 5 is made large in size to obtain a wide display area in order to increase the degree of freedom in shaping.

For this reason, depending on the model, a single liquid crystal cell can be used to display multiple displays. For example, the liquid crystal cell 4 is modeled so that a gauge display and a warning display are performed in one liquid crystal cell, and the warning display is Color display is used to make it easier to distinguish from other parts.

By the way, the liquid crystal display device shown in FIG. 1 does not have the liquid crystal cell 4 removed.
As shown in FIG. 2, the liquid crystal plate 5 has a structure in which polarizing plates 6 and 6' are stacked on both sides, and
GH liquid crystal (Quest H'ost
) are sealed and stacked in the same direction as the polarization direction of the polarizing plates 6 and 6', and when a driving signal is applied, only the electrode segment part becomes transparent, and the other part becomes transparent due to the dye. A light source 7 is installed behind the liquid crystal cell 4 to provide a negative display with strong black color.
By providing a semi-transparent plate 8 which receives light emitted from the display via a diffuser plate 13 and outputs white illumination light, a gauge pattern 9 that stands out in white on a black background is displayed.

On the other hand, regarding the color display of the warning pattern 10, the colored parts 11a (red), 11b (yellow), 11
C (blue), so that each of the warning patterns 10 can be displayed in color.

However, in such a conventional liquid crystal display device, the light shielding rate of the liquid crystal body 5 when not driven is not 100%, so light from backlighting passes through the liquid crystal plate 5, which is black when not driven. When the surrounding area is dark, especially at night, the colored part 11a on the semi-transparent plate 8,
The colors of llb and IIC appear washed out due to backlighting,
It makes me feel uncomfortable.

Therefore, in order to maintain visibility without changing the brightness of the non-colored parts, the transmittance of the colored parts and their surroundings was lowered, and the colored parts 118 to 11 of the semi-transparent plate 8 were illuminated with backlight.
It is necessary to attenuate the colored light leaking from the liquid crystal panel 5 through C to improve the visibility of the meter.

For this purpose, as shown in FIG. 3, for example, the semi-transparent plate 8 is divided into a portion 8a facing the gauge pattern 9 and a portion 8b facing the warning pattern 10,
It is conceivable to make the transmittance of the semi-transparent plate 8b having a to 11C smaller than the transmittance of the uncolored semi-transparent plate 8a.

However, two semi-transparent plates 3a I with different transmittances
8b and the back of the liquid crystal panel 5, it takes a lot of man-hours to process to calculate the area of the cut surface where the two meet.
Further, although the colored portions 11a to 11b i disappear and become invisible, the seam between the semi-transparent plates 8a and 8b becomes clearly visible due to the difference in transmittance, resulting in a problem that visibility is impaired.

The present invention has been made in view of the above, and in order to prevent the colored part for warning display of the semi-transparent plate provided behind the liquid crystal cell from being seen through due to light leakage from the light source, with a simple structure.
The coloring of the semi-transparent plate is painted in the same color as the color.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 4 is an exploded view showing one embodiment of the present invention. First, to explain the structure, polarizing plates 6 and 6' having the same polarization direction are stacked on both sides of the liquid crystal plate 50, which is a 4H liquid crystal cell and has a negative display structure, with GH liquid crystal sealed between glass plates. , an electrode segment 9 forming a gauge display pattern and an electrode segment forming a warning display pattern 10 minutes are arranged on the liquid crystal body 5.
When a driving signal is applied to the electrode segment, the alignment of the liquid crystal structure in the electrode segment portion changes so that light ft is transmitted. A semi-transparent plate 8 is provided behind the liquid crystal cell 4,
The semi-transmissive plate 8 has a milky white color, and receives the light from the light source 7 to backlight the liquid crystal cell 4 with white illumination light. On the right side of the semi-transparent plate 8 facing the warning display pattern 10, colored parts 11a to IIC are formed by painting with paint of a predetermined color, and when the warning display pattern of the liquid crystal cell 4 and the display are driven, colored parts 11a to IIC are formed. The warning pattern 10 can be displayed in transparent color using the colored lights of the colored parts 118 to 11C. The areas where the colored parts 11a to IIC are printed or painted and their surroundings are coated with a white coating 2 as shown by diagonal lines, and the white coating 2 is applied to other parts of the semi-transparent plate 8. The transmittance is reduced by the amount applied.

That is, as is clear from the side view of the semi-transparent plate 8 taken out and shown in FIG.
is applied, so the light from the light source that passes through the white-painted part 12 is as much as the white-painted part 121, compared to the other Mi parts that are not white-painted. The intensity of the light decreases, and as a result, the intensity of the light that enters the liquid crystal cell 4 from the colored parts 118 to 11C weakens, and even if backlighting is performed by the light source 7, the semi-transparent plate 80 and the colored part 111 are not illuminated at night. -11C is reliably prevented from being seen through the liquid crystal cell 4 17.

In addition, the transmittance in the colored parts 118 to 11C of the semi-transparent plate 8 can be easily reduced by painting with white paint, and there is no increase in the number of assembly lines, and the cost is small. .

Furthermore, in order to prevent the formation of a boundary due to the difference in transmittance at the boundary between the white painted part 12 and the part not coated with white, the white painting at the boundary can be done by using a gradation painting. By applying the gradation coating, it is possible to reliably prevent the boundary between the white painted portion 12 and the portion not coated with white from being visible.

Incidentally, although the above embodiment takes as an example the case where the gauge display and the warning display are performed using a single liquid crystal cell,
The present invention is not limited thereto, and can be applied as is to any suitable liquid crystal display device in which a single liquid crystal cell has a white display pattern based on backlight transmitted illumination and a color display pattern based on colored portions provided on a semi-transparent plate. . Further, it goes without saying that the colored parts 118 to 11C formed on the semi-transparent plate 8 may be colored with paint, or may be formed by interposing or adhering a color filter or the like.

As explained above, according to the present invention, a white display pattern and a color display pattern are formed in the liquid crystal cell by the configuration and the arrangement of the electrode segments, and the back of the liquid crystal cell receives light from the light source. In a device equipped with a semi-transmissive plate that outputs white illumination light, the colored part of the semi-transmissive plate and its surroundings are painted white in a device in which the part of the semi-transmissive plate facing the color display pattern of the liquid crystal cell is colored in a prescribed manner. Since the transmittance is lower than that of the non-colored parts, the transmittance of the colored parts and their surroundings can be reduced while maintaining visibility without changing the brightness of the non-colored parts by just applying white paint. It is possible to color the transmissive plate by attenuating the colored light leaking from the liquid crystal through the colored part of the semi-transmissive plate using backlighting without increasing the number of assembly lines or increasing costs. This has the effect of preventing parts from being seen through and improving the visibility of a meter using a liquid crystal.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional liquid crystal display device with water separated, Fig. 2 is an exploded assembly diagram of the liquid crystal display device, and Fig. 3 is a conventional transparent material with a divided structure that lowers the transmittance of the colored part. A perspective view of the plate; FIG. 4 is a split assembly view showing an embodiment of the present invention;
FIG. 5 is a side view of the semi-transparent plate in the embodiment of FIG. 4. 4...Liquid crystal cell 5...Liquid crystal body 6.6'・
...Polarizing plate 7...Light source 8...Semi-transparent plate
11a to 11c... Colored portion 12... White painted portion 13... Diffusion plate patent applicant Nissan Motor Co., Ltd. agent Patent attorney Tsuchihashi Kaoru l7i2'',''
・Changes to the contents of the engraving 1. Figure 1, Figure 4, Figure 13) / 10 Figure 5 Procedural amendment (method) % formula % 1 Indication of the incident Showa FI7 Relationship with the case of a person who does
r, name) (199) Nissai Automatic Co., Ltd. 4, Agent 105 Telephone: 580-8931 6 Number of inventions increased by amendment 7 Specifications subject to amendment*, drawings, and qualifications 8 Contents of amendment (1) Submission of specification and illustrations (without any change in content; 2) Submission of letter of appointment. Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Indication of the case, 1981 Percentage Application No. 018145, 2, Name of the invention, Liquid crystal display device for vehicles 3, Person making the amendment, Relationship to the case, Patent applicant address, Kanna, Yokohama City, Kamiyoyoukei Yoku Takaracho 2 survey area name (
399) Nissan Motor Co., Ltd. 4 Agent Address: 105 Telephone: 580-8931 Address: 1-17 Toranomon, Minato-ku, Tokyo, No. 3 (Claims column of detailed expenses, detailed description of the invention 6, contents of amendments) (1) The statement in the claims column of the specification of the procedural amendment dated June η, 1980 is amended as shown in the attached sheet. (2) Specification No. 1 of written amendment dated June 23, 1988
Page 16th-17th line “Do...
・Correct "colors that appear off-color" to "displayed colors on the color display section appear off-color when not in use." (3) ``Meter panel'' in the 3rd and 4th lines of page 2 of the Procedural Amendment dated June 1980 is amended to ``1 instrument panel.'' (4) Amend JATj to rA/TJ on page 2, line 9 of the 1986 6% Procedural Amendment. (5) Procedural Amendment No. 2jt No. 1 dated June 23, 1988
As for the 9~ line 1 kakuri...
"Display in color" should be amended to "display in color due to legal restrictions and for ease of identification from other parts." (6) Procedural amendment dated June n, 1988: 9i) Page 5, line 3, "11a-11b" was amended to "11a-11C". (7) 5th negative 7th date of June 1982 procedural amendment '4
~Line 12 [From the light source...
・It was designed to do so. J is "In order to prevent the colored part for alarm display of the semi-transparent plate installed behind the liquid crystal cell from being seen through when the liquid crystal is not driven due to light leakage from the night light source, the colored part is A coating film of the same color as the light source color is formed on the surface area of the semi-transparent plate. (8) ``Liquid crystal plate'' in the 17th line of the 5th edition of the Procedural Amendment Form dated June 1980 is corrected to ``1 liquid crystal body.'' (9) "Prevented" in the 10th line of page 7 of the Procedure Drawing Honor dated June n, 1980, "prevented.""It is installed on the side." 00) Procedural amendment dated June 23, 1981, page 7, No. 13
- Line 14: "No increase in the number of assembly lines" is corrected to "No increase in the number of assembly steps." (11) Procedural Amendment IIF No. 8 dated June 1982
The first line of the page, ``It can be prevented.'' 1 can be prevented. By applying the above coating, even if strong light enters from the outside and the display is viewed in a reflective manner, the painted surface is on the opposite side of the liquid crystal cell (illumination source 1g11), so there is no effect on the reflectance of the semi-transmissive plate 80. It has no effect. ”. α's 1986 6% date procedure sleeve official book, page 9, 4-5
Line ``Assembling the number of lines...4...without serving''
"without compromising the increase in assembly man-hours and costs"
Correct to. , Q3) Ministry of Procedure and Correction dated June 1982, page 9, line 16, ``Figure 5'' is corrected to ``1 Figure 5, Figure 6 is''. σΦ Date of June 1980, amended procedure, attached drawing 1.
Figure 6 will be additionally corrected as per the attached correction direction. Claims (after amendment) In an apparatus, a colored portion of a semi-transmissive plate disposed behind a liquid crystal cell is placed on a surface area of the semi-transmissive plate where the colored portion is to be formed,
A product display device for a vehicle, characterized in that a coating film is formed in the same color as a light source color.

Claims (2)

[Claims] (1) In a device that displays a colored portion of a semi-transparent plate disposed behind a liquid crystal cell in color by backlighting from a light source, a coating film of the same color as the light source is formed on the colored portion of the semi-transparent plate. A liquid crystal display device for a vehicle characterized by the following. (2) The liquid crystal display device for a vehicle according to claim 1, wherein the paint layer is formed on a colored portion of the semi-transparent plate and in the vicinity thereof.