JP3277897B2 - Transmission illumination type display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmissive illumination type display panel used for, for example, an instrument for a vehicle, and more particularly, to a transmissive type panel provided with a dimming layer on the back surface of the display panel for balancing transmission during transmissive illumination. The present invention relates to an illuminated display panel.

[0002]

2. Description of the Related Art A cross section of a transmission illumination type display panel 1 used for a conventional vehicle instrument or the like is as shown in FIG. The transparent display layer 4 is formed by printing with, for example, white transparent ink, and the ground color layer 5 is formed by printing with, for example, black impermeable ink on the transparent display layer 4 except for the display unit 3. I have. When a light source (not shown) disposed on the back side of the transmissive illumination type display panel 1 is turned on, if the display unit 3 is desired to be transmitted and illuminated in red, for example, the red transparent coloring layer 6 And a black dimming layer 7 is printed on the back surface of the substrate 2 in, for example, a halftone dot shape in order to balance the transmission of the display unit 3 at the time of transmitted illumination.

In the transmissive illumination type display panel 1 configured as described above, in the daytime, the display section 3 is visually recognized by external light in white, and the display section 3 except for the display section 3 is viewed in black. When the surroundings are dark, such as at night, by turning on a light source (not shown), direct light or light that enters from the back surface of the substrate 2 other than the portion corresponding to the display unit 3 and travels while repeating reflection within the substrate 2 may be used. The display unit 3 is transparently displayed in a mixed color of white and red, and the portions other than the display unit 3 are visually recognized in black.

[0004] The printing plate for the light control layer of the light control layer 7 is
It is obtained by a method as described in JP-B-6-25679. That is, as shown in FIG. 5, the translucent image capturing flat plate 9 is fixed to the inner unit 8 and stored in a case 10 having an open front surface. As shown in FIG. 6, the image capturing flat plate 9 prints the same white image capturing display layer 11 as the transmissive display layer 4 shown in FIG. 4 on the surface of the colorless and transparent substrate 2A. In addition, on the back surface of the substrate 2A, a coloring layer 12 for capturing a red image, which is the same as the transparent coloring layer 6 shown in FIG. 4, is provided. Then, the light source 13 housed in the case 10 is turned on, and the video camera 14 installed above the image capturing flat plate 9 directly captures the imbalance of the brightness of the entire surface of the image capturing flat plate 9, and is used for image capturing. A printing plate for a light control layer is formed in which halftone dots corresponding to the brightness of the entire surface of the flat plate 9 are formed. The light control layer 7 is provided on the back surface of the substrate 2 by printing using the printing plate for a light control layer obtained in this manner.

[0005]

However, in the transmission illumination type display panel 1 in the above-mentioned conventional example, the direct light from the light source 13 or the light reflected on the case 10 directly irradiates a portion corresponding to the display section 3 to display the display section. In addition to the direct light, light entering the substrate 2 from the back surface of the substrate 2 other than the portion corresponding to the display unit 3 passes through the substrate 2 and passes through the display unit 3, so that the display unit 3 The brightness of 3 is also affected by the light entering the substrate 2. By the way, variations in printing of the transmissive illumination type display panel 1 and variations in emission luminance of the light source 13 may adversely affect the brightness of the display unit 3. That is, in addition to the variation in transmission due to the light directly shining on the display unit 3, the variation in light entering from the back surface of the substrate 2 other than the portion corresponding to the display unit 3 and traveling while repeating reflection in the substrate 2 as described above. Influence of the luminance on the display unit 3 due to the influence was large.

In capturing an image, the direct light from the light source 13 or the light reflected on the case 10 directly irradiates the portion corresponding to the display portion 3 and also corresponds to the portion to be the display portion 3. Since the light entering the substrate 2A from the back surface of the substrate 2A other than the location passes through the interior of the substrate 2A to the location serving as the display unit 3, the location serving as the display unit 3 may be too bright than desired. A halftone dot having a high light-shielding rate at the time of shooting, that is, a printing plate for a light control layer having a large black range is completed. When the light control layer 7 is provided on the back surface of the substrate 2 by printing using the light control layer printing original plate, the non-print area hardly disappears due to the variation at the time of printing where the black range is larger. In some cases, luminance unevenness occurred on the display unit 3.

A light control layer 7 is formed by using a light control layer printing original plate obtained by determining a halftone dot in the absence of the black ground color layer 5.
A black ground color layer 5 is provided on the transmissive display layer 4 on the surface of the transmissive illumination type display panel 1 on which is printed. For this reason, there is a portion where the light entering the substrate 2 is absorbed in black from a portion other than the portion corresponding to the display portion 3, which is different from the transmission balance at the time of preparing the printing plate for the light control layer.
May have uneven brightness.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object of the present invention is to provide a transmissive illumination type display panel having a good transmission balance of the entire transmissive display section at the time of transmissive illumination.

[0009]

In order to solve the above-mentioned problems, the present invention provides a light-transmitting substrate and a light-transmitting display portion formed on the front or back surface of the substrate and illuminated from the back surface. A transmissive display layer, a ground color layer formed on the surface of the substrate except for the display unit, and a transmission balance of the display unit formed on the rear surface of the substrate corresponding to the display unit and the vicinity thereof a light control layer for, together with the formed by the dimming layer for restricting the light attempting to enter into the substrate is formed on the back surface of the substrate except the light control layer, before
The light control layer is formed on the front surface or the back surface of the image capturing flat plate.
Image capture table that is the same or similar color as the transmissive display layer
An indicator layer was formed, and the display portion and its vicinity were removed.
On the surface of the image capturing flat plate corresponding to the area,
Use a ground color layer for image capture that is the same or similar to the ground color layer.
Forming said image corresponding to said image capturing ground color layer
The light-reducing layer is formed on the back surface of the capturing flat plate, and this image is formed.
Capture images with illumination from the back side of the capture plate
Imbalance of the brightness of the flat plate surface
This is a dimming mode corresponding to the brightness to be obtained.

[0010]

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A scale is provided on the surface of a colorless and transparent substrate 2.
For example, a white transmissive display layer 4 serving as a display unit 3 for numbers and characters is printed and formed, and a black ground color layer 5 is printed and formed on the transmissive display layer 4 except for the display unit 3. When a light source (not shown) disposed on the back side of the transmissive illumination type display panel 1 is turned on, if the display unit 3 is desired to be transmitted and illuminated in red, for example, the red transparent coloring layer 6 In addition, in order to balance the transmission of the display unit 3 during transmission illumination, the black dimming layer 7 is printed, for example, in a halftone dot area in a range wider by 2 to 3 mm on a side corresponding to the display unit 3. In order to limit the amount of light transmitted to the display unit 3, a black dimming layer 15 is printed in, for example, a halftone dot area in a range excluding the dimming layer 7.

As described above, the light control layer 7 is provided at a position corresponding to the display unit 3 and at a position in the vicinity thereof, and the portions other than the light control layer 7 are covered with the halftone dot-like light reducing layer 15. Light that tries to enter the substrate 2 from a location other than the location corresponding to the location 3 and the vicinity thereof is restricted by the light reducing layer 15. Therefore, even if light enters the substrate 2 from a portion other than the portion corresponding to the display portion 3 and the vicinity thereof, the adverse effect on the display portion 3 is small, and the luminance unevenness of the display portion 3 is small.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to each embodiment. The same or corresponding parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted. FIGS. 1 and 2 show a transmissive illuminated display panel 1 according to a first embodiment of the present invention, in which a transparent display layer 4 serving as a display section 3 for scales, numerals, characters, etc. is provided on a surface of a colorless and transparent substrate 2, for example. A print is formed with a white transmissive ink, and a ground color layer 5 is formed on the transmissive display layer 4 with, for example, a black impermeable ink except for the display unit 3. When a light source (not shown) disposed on the back side of the transmissive illumination type display panel 1 is turned on, if the display unit 3 is desired to be transmitted and illuminated in red, for example, the red transparent coloring layer 6 In addition, in order to balance the transmission of the display unit 3 during transmission illumination, the black dimming layer 7 is printed, for example, in a halftone dot area in a range wider by 2 to 3 mm on a side corresponding to the display unit 3. Also,
In order to limit the amount of light transmitted to the display unit 3, a black dimming layer 15 is printed in, for example, a halftone dot shape in a range excluding the dimming layer 7.

In the transmissive illumination type display panel 1 configured as described above, the display portion 3 such as scales, numerals, characters, etc. is visually recognized by external light in the daytime in white, and the display portions 3 other than the display portion 3 are viewed in black. Also, when the surroundings are dark, such as at night, the display unit 3 is brightly transmitted and displayed in a mixed color of white and red mainly by direct light by turning on a light source (not shown), and the portions other than the display unit 3 are visually recognized in black.

The printing plate for the light control layer of the light control layer 7 in this embodiment is prepared by the same method as the conventional method shown in FIG. 5, but the image capturing flat plate 9 used for this is as shown in FIG. is there. On the surface of the colorless and transparent substrate 2A, the same white image capturing display layer 11 as the transmissive display layer 4 shown in FIG. 1 is formed by printing, and the display shown in FIG. A ground color layer 16 for capturing an image of black, which is the same as the ground color layer 5 shown in FIG. Further, on the back surface of the substrate 2A, there is a coloring layer 12 for capturing an image of red which is the same as the transparent coloring layer 6 shown in FIG. 1, and a ground color layer 16 for capturing an image below the coloring layer 12 for capturing an image. The black dimming layer 15 is provided in, for example, a halftone dot shape in substantially the same range.

The respective color tones of the image capturing display layer 11, the image capturing ground color layer 16, and the image capturing coloring layer 12 correspond to the respective printing layers formed on the transmission illumination type display panel 1 shown in FIG. Although it is desirable that the color is the same as the color, it is not always necessary that the color is the same, and it is sufficient if the color is an approximate color. Also, if the ground color layer 16 for image capture is in the same range as the ground color layer 5, the light control layer 7 to be formed will be in the same range as the display unit 3,
There is a case where oblique direct light from the light source passes through the display unit 3 without passing through the light control layer 7. In order to prevent this phenomenon, consider that the light control layer 7 is formed in a wider area than a portion corresponding to the display unit 3. Thus, the image capturing ground color layer 16 is formed, and the present invention is not limited to the above numerical values.

The halftone dot range of the printing plate for a light control layer obtained in this manner is a range excluding the ground color layer 16 for taking an image (also a range excluding the dimming layer 15), that is, FIG.
The printing range of the dimming layer 7 formed on the transmissive illumination type display panel 1 shown in FIG. 1 is not necessarily provided in the entire range except for the image capturing ground color layer 16.
As described above, since the halftone dots are formed corresponding to the brightness of the entire surface of the image capturing flat plate 9, no halftone dots are formed at the low brightness portions. Therefore, some of the plurality of display units 3 of the transmissive illumination type display panel 1 shown in FIG. 1 include a display unit in which the light control layer 7 is not provided at all and a display unit in which the light control layer 7 is provided only partially.

As described above, the dimming layer 7 is provided on all or a part of the portion corresponding to the display section 3 and the vicinity thereof, and the portions other than the dimming layer 7 are covered with the halftone dot-like dimming layer 15. Because
Light that is going to enter the substrate 2 from a portion other than the portion corresponding to the display portion 3 and the vicinity thereof is restricted by the dimming layer 15. Therefore, even if light enters the substrate 2 from a portion other than the portion corresponding to the display portion 3 and the vicinity thereof, the adverse effect on the display portion 3 is small, and the luminance unevenness of the display portion 3 is small. At this time, the formation portion of the dimming layer 15 corresponds to the substrate 2 other than the dimming layer 7.
The whole area on the back surface may be simple, but may be only the area that affects the transmission to the display unit 3.

Further, at the time of capturing an image, since the dimming layer 15 is provided on the back surface of the substrate 2A corresponding to the ground color layer 16 for capturing an image, a portion corresponding to a portion excluding the ground color layer 16 for capturing an image is provided. Light that tries to enter the substrate 2A from other sources is limited by the dimming layer 15. Therefore, the light-shielding ratio of the light-adjusting layer 7 of the light-adjusting-layer printing original plate to be formed can be lower than that of the conventional example, and unlike the conventional example, troubles during printing hardly occur, and the luminance unevenness of the display unit 3 is small.

Further, at the time of capturing an image, the ground color layer 1 for capturing a black image in substantially the same range as the ground color layer 5 shown in FIG.
6 was performed using the image capturing flat plate 9 printed thereon, so that halftone dots were formed in the same state as in consideration of the ground color layer 5,
The dimming mode of the dimming layer 7 obtained in this manner is also a mode in which the transmission balance at the time of preparing the printing master for the dimming layer can be obtained, the luminance unevenness of the display unit 3 is small, and the transmission balance of the display unit 3 is improved.

FIG. 3 shows a second embodiment of the present invention. The transilluminated display panel 1 of this embodiment is the same as that of the first embodiment, except that a light-transmitting light guide plate 17 is provided on the back side of the transilluminated display panel 1.
The light source 13 is disposed on the side end side of the light guide plate 17, and the light guided from the light guide plate 17 is applied to the back surface of the transmissive illumination type display panel 1, which is the same as in the first embodiment. The effect can be obtained. As described above, as a method of illuminating the transmissive illumination type display panel 1 from the back side, the light source 13 does not necessarily have to be arranged on the back side of the transmissive illumination type display panel 1.

In the present invention, the light-attenuating layer 15 has a halftone dot shape. However, solid printing with low transmittance or solid light-shielding printing may be used. In the case of shading printing, the display unit 3
Light does not enter the substrate 2 from a location other than the location corresponding to the location and the vicinity thereof, so that the display section 3 is less adversely affected and luminance unevenness of the display section 3 hardly occurs. The light control layer 7
Of the light-shielding layer 15 can be made even lower than when the light-attenuating layer 15 is formed in a halftone dot shape, and problems during printing are less likely to occur.
Is less likely to occur.

[0023]

According to the present invention, there is provided a light-transmitting substrate, a light-transmitting display layer formed on the front surface or the rear surface of the substrate and serving as a light-transmitting display portion by illumination from the rear surface, and a front surface of the substrate. A light-adjusting layer formed on the back surface of the substrate corresponding to the display portion and a portion near the display portion for balancing the transmission of the display portion; Except for the layer, form it on the back side of the substrate and insert it into the substrate.
The provision of the dimming layer for restricting the light to be transmitted restricts the light that is going to enter the substrate from a portion other than the portion corresponding to the display portion and its vicinity.
Therefore, even if light enters the substrate from a portion other than the portion corresponding to the display portion and the vicinity thereof, the adverse effect on the display portion is small, and the luminance unevenness of the display portion is small.

When a printing master for a light control layer is prepared, a dimming layer is provided on the back surface of the substrate corresponding to the ground color layer for image capture, so that the location corresponding to the location excluding the ground color layer for image capture is provided. Light entering the substrate from other sources is limited by the dimming layer. Therefore, the light-shielding ratio of the light-modulating layer of the printing plate for the light-modulating layer to be formed can be lower than that of the conventional example, and unlike the conventional example, troubles during printing hardly occur, and luminance unevenness of the display portion is small.

Further, when the printing master for the light control layer was prepared, the printing was performed using a flat plate for image capturing on which a black image capturing ground color layer having substantially the same range as the ground color layer was printed. The dimming layer is formed in the same state as considered, and the dimming mode of the dimming layer obtained thereby becomes a mode in which the transmission balance at the time of preparing the printing master for the dimming layer is obtained, and the luminance unevenness of the display unit is small, The transmission balance of the display unit is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a transmission illumination type display panel showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of an image capturing flat plate when the printing plate for a light control layer of the embodiment is formed.

FIG. 3 is a side view of a transmitted illumination type display panel showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part of a transmission illumination type display panel showing a conventional example.

FIG. 5 is an explanatory diagram when a printing plate for a light control layer is prepared.

FIG. 6 is a cross-sectional view of a main part of an image capturing flat plate when a printing plate for a light control layer according to a conventional example is prepared.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmissive illumination display panel 2, 2 A substrate 3 display unit 4 transmissive display layer 5 ground color layer 7 dimming layer (halftone dot) 9 flat plate for image capture 11 display layer for image capture 15 darkening layer 16 image capture Ground color layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01D 13/04 G01D 11/28 G09F 13/04

Claims (1)

(57) [Claims] 1. A light-transmissive substrate, a transmissive display layer formed on a front surface or a back surface of the substrate and serving as a light-transmissive display unit by illumination from the back surface, and the display unit on the surface of the substrate. And a light control layer formed on the back surface of the substrate corresponding to the display portion and the vicinity thereof to balance the transmission of the display portion, except for the light control layer. together and to be formed by the dimming layer for restricting the light attempting to enter the formed within the substrate on the back surface of the substrate
The light modulating layer may be a front surface or a back surface of a flat plate for capturing an image.
The image capture having the same or similar color as the transparent display layer
Only a display layer, and the display portion and its vicinity
Surface of the flat plate for image capture corresponding to the removed area
For capturing an image having the same or similar color as the ground color layer
A ground color layer is formed and corresponds to the ground color layer for image capture.
Forming the dimming layer on the back surface of the image capturing flat plate,
Image by illumination from the back side of this image capturing flat plate
Immediately captures the imbalance in the brightness of the surface
A transmissive illumination type display panel having a dimming mode corresponding to the brightness obtained by imaging .