JP2004184838A - Fitting structure for composite display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent display of a display device in the back from being hard to see owing to transmitted light from a light leak surface of a transparent display unit as to a fitting structure constituted by fitting a composite display device, constituted by arranging a light self-emission type transparent display unit in a portion of a display area of a display device one over the other on the front side of the dislay device, to a fitted member. <P>SOLUTION: The light leak surface 22, where light leaks, other than the display surface of the transparent display unit 20 overlaps with the display area of the display device 10, and the angle between the light leak surface and a sight line direction Y1 at the time of use, i.e. the angle θ from the light leak surface 22 to the sight line direction Y1 through outside the transparent display unit 20 is ≥180°. Consequently, intense transmitted light from the light leak surface 22 of the transparent display unit 20 does not come directly on the eye of a user K1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure of a composite display device in which a self-luminous type transparent display is superimposed on a front side of a display device such as a liquid crystal display device.
[0002]
[Prior art]
Conventionally, as this type of composite display device, there is an example of a composite display device in which a transparent EL (electroluminescence) display is disposed as a self-luminous type transparent display in front of a liquid crystal display device (for example, Patent Document 1). reference).
[0003]
This is, for example, mounted on a front panel of an automobile and adopted as a meter or the like, and can be displayed in a form in which the display of a liquid crystal display device and the display of a transparent EL display are superimposed.
[0004]
[Patent Document 1]
JP-A-2001-83913 [0005]
[Problems to be solved by the invention]
However, conventionally, the transparent EL display is superimposed over the entire display area of the display device. Therefore, when the transparent display device on the front is actually displayed, the display on the display device on the rear surface is very poor. Would be difficult to see.
[0006]
In addition, in a self-luminous EL display, a plasma display, or the like, which is a transparent display, element destruction or a black spot defect occurs due to fine foreign substances mixed in during a process. Was a major factor in dropping
[0007]
Therefore, a composite display device in which a transparent display is arranged on the front side of the display device so as to overlap a part of the display area of the display device is being studied. However, according to the study of the present inventors, it has been found that the following problem occurs when the transparent display is provided in a part of the display area of the display device on the back surface.
[0008]
Specifically, as shown in FIG. 2, when a transparent display 20 including a transparent EL display is disposed above the front surface 11 of the display device 10, light leakage other than the display surface of the element substrate of the transparent display 20 causes light leakage. The resulting end face (light leakage surface) 22 overlaps the display area of the display device 10, and there is a problem that light leakage generated from the end surface 22 makes it difficult to view the display on the rear display device 10.
[0009]
Here, the light leakage from the end face 22 will be described with reference to FIG. 3 which is an enlarged sectional view of the transparent display 20. The transparent display 20 is formed by forming an EL element 40 as a light emitting element on a front surface of an element substrate 30.
[0010]
Light from the EL element 40 formed on such an element substrate 30 is extracted as emitted light on the front surface, is internally reflected inside the element substrate 30, and propagates in the plate surface direction. Light leakage also occurs at a certain end face 22. Note that this light leakage occurs on the end face of the element substrate even if it is a self-luminous type transparent display, even if it is something other than EL.
[0011]
In this case, among the light leaking from the end face 22, the reflected light (shown by a broken line in FIG. 3) has low intensity, but the transmitted light is stronger than the reflected light (shown by a solid line in FIG. 3). This is caused by the difference in the refractive index between air and the glass constituting the substrate 30. For this reason, the leaked strong transmitted light enters the user's eyes and hinders the display image on the rear surface.
[0012]
In particular, when a display driven by horizontal line scanning is adopted as the display device 10 on the back surface, the end face (light leakage surface) 22 of the transparent display 20 and the scanning line of the display device 10 become parallel, and light leaking from the end face 22 becomes parallel. And the horizontal line scanning light interfere with each other, so that the display image on the back surface becomes difficult to see.
[0013]
In view of the above problems, the present invention provides a mounting method in which a composite display device in which a self-luminous type transparent display is arranged on a front side of a display device so as to overlap a part of a display area of the display device is mounted on a member to be mounted. It is an object of the present invention to prevent a display on a rear display device from being difficult to see due to transmitted light from a light leakage surface of a transparent display.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a display device (10) and a self-luminous type that is arranged on a front side of the display device so as to overlap a part of a display area of the display device are provided. In a mounting structure in which a composite display device including a transparent display (20) is mounted on a member to be mounted, a light leakage surface (22) where light leakage occurs other than the display surface of the transparent display is provided in a display area of the display device. The angle (θ) between the light leaking surface and the line of sight (Y1) in use and passing from the light leaking surface to the outside of the transparent display in the line of sight is 180 ° or more. It is characterized by having become.
[0015]
According to this, strong transmitted light from the light leakage surface of the transparent display does not directly enter the user's eyes. Therefore, it is possible to prevent the display of the display device from being difficult to see due to the transmitted light from the light leakage surface of the transparent display.
[0016]
According to the second aspect of the present invention, there is provided a display device (10) and a self-luminous type transparent display device (20) which is arranged on a front side of the display device so as to overlap a part of a display area of the display device. In a mounting structure in which a composite display device comprising: a transparent member is mounted on a member to be mounted, the transparent display is disposed above the display device, and a light leakage surface (22) where light leakage other than the display surface of the transparent display occurs. ) Overlaps a portion between the upper end and the lower end in the display area of the display device, and has a positional relationship such that the line of sight in use is above the light leakage surface. .
[0017]
According to the present invention as well, since strong transmitted light from the light leaking surface of the transparent display does not directly enter the user's eyes, it is possible to prevent the transmitted light from the light leaking surface of the transparent display from obstructing the display of the display device. can do.
[0018]
According to a third aspect of the present invention, in the mounting structure of the composite display device according to the first or second aspect, the cover glass of the transparent display (20) is provided so as to cover the entire display area of the display device (10). It is characterized by having been done.
[0019]
According to this, the user can be prevented from touching the transparent display or the display device, which is preferable.
[0020]
According to a fourth aspect of the present invention, in the mounting structure for a composite display device according to the third aspect, a transparent display device is provided between the display device (10) and the cover glass (50) in a display area of the display device. A dummy substrate (100) made of the same material as that of the element substrate (30) of the transparent display is provided so as to cover all areas where (20) is not overlapped.
[0021]
According to this, on the front surface of the display area of the display device, all the areas where the transparent display does not exist have the form in which the dummy substrate is provided. Therefore, the transmitted light from the light leaking surface of the transparent display passes through the dummy substrate having the same refractive index as the element substrate, and is transmitted from the end surface of the dummy substrate located outside the display area of the display device. You can escape. As a result, it is possible to reduce the amount of transmitted light from the light leakage surface recognized by the user.
[0022]
According to the fifth aspect of the present invention, in the mounting structure of the composite display device according to the fourth aspect, a transparent display is provided between the light leakage surface (22) of the transparent display (20) and the dummy substrate (100). A member (55) having a refractive index close to that of the element substrate (30) and the dummy substrate of the vessel is interposed.
[0023]
According to this, when light transmitted from the light leakage surface of the transparent display is transmitted to the dummy substrate, leakage can be further reduced, which is preferable.
[0024]
It should be noted that reference numerals in parentheses of the above-described units are examples showing the correspondence with specific units described in the embodiments described later.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described. In the following embodiments, the same parts are denoted by the same reference numerals in the drawings.
[0026]
(1st Embodiment)
FIG. 1 is a front view of the composite display device S1 according to the first embodiment of the present invention. FIG. 2 is a right side view of FIG. 1, and FIG. 3 is an enlarged sectional view of a transparent EL display 20 as a transparent display in the present composite display device S1.
[0027]
In the example shown in FIG. 1, an image is projected on the display device 10 on the back, and the weather forecast as a character image is projected on the transparent EL display 20 on the front while overlapping the image on the back.
[0028]
The display device 10 can adopt a liquid crystal display device, an EL display device, a plasma display, or the like. The display device 10 of the present example has matrix type pixels composed of stripe-shaped electrodes extending in the left, right, up and down directions in FIG. 1 and is driven by horizontal line scanning.
[0029]
On the front surface 11 of the display device 10, a transparent EL display 20 is arranged so as to overlap a part of the display area of the display device 10. As the transparent display 20, a plasma display can be employed in addition to the self-luminous EL display.
[0030]
As shown in FIG. 3, the transparent display device 20 of the present embodiment is an EL display device in which an EL element (light emitting element) 40 is formed on the front surface of an element substrate 30, and as shown in FIG. In addition, a transparent EL display 20 provided with a cover glass 50 for protecting the EL element 40 in the transparent EL display 20 is employed.
[0031]
As shown in FIGS. 1 and 2, the transparent EL display 20 is disposed above the display device 10. Further, a circuit board 60 for driving the display device 10 and the transparent EL display 20 is provided on the back surface 12 of the display device 10. Further, the circuit board 60 and the transparent EL display 20 are electrically connected via a flexible printed board 70 arranged on the upper side of the display device 10.
[0032]
Thus, the transparent EL display 20 has a one-sided electrode take-out structure using the flexible printed circuit board 70. The flexible printed board 70 and the transparent EL display 20 and the circuit board 60 are connected by soldering or the like.
[0033]
A cover 80 made of metal, resin, or the like is provided on the upper part of the display device 10 so as to cover the flexible printed circuit board 70. The cover 80 is fixed to the display device 10 by screws or adhesive, and holds the transparent EL display 20.
[0034]
In such a composite display device S1, the lower end surface 22 and the left and right end surfaces 23 other than the display surface of the element substrate 30 of the transparent EL display 20 are light leakage surfaces. As described above with reference to FIG. 3, the light leaks when light from the EL element 40 formed on the element substrate 30 propagates in the plate surface direction of the element substrate 30 and transmits from the end faces 22 and 23. Is the main.
[0035]
Here, in this example, the left and right end faces 23 are out of the display area of the display device 10 as shown in FIG. 1, and the substantial light leakage surface of the transparent EL display 20 is the display area of the display device 10. The lower end face 22 is exposed between the upper end and the lower end of the lower end.
[0036]
Here, the detailed structure of the transparent EL display 20 will be described including the element structure. FIG. 4 is a schematic sectional view of the element substrate 30 and the EL element 40 in the transparent EL display 20.
[0037]
A first transparent electrode 41 is formed and formed on a glass substrate 30 as an element substrate, a first insulating layer 42 is formed on the first transparent electrode 41, and a light emitting layer 43 is formed on the first insulating layer 42. After the second insulating layer 44 is formed on the light emitting layer 43, the second transparent electrode 45 is formed on the second insulating layer 44.
[0038]
The first transparent electrode 41 and the second transparent electrode 45 are formed, for example, by depositing ITO (indium tin oxide) by an electron beam welding method or a sputtering method, and by photo etching to have a predetermined shape. The first and second insulating layers 42 and 44 and the light emitting layer 43 are formed by a sputtering method, a vapor deposition method, or the like using a material generally used for an inorganic EL element.
[0039]
FIG. 5 is a partially enlarged sectional view of the transparent EL display 20. After the EL element 40 is formed inside the glass substrate (element substrate) 30, the cover glass 50 is adhered to the front side of the glass substrate 30 at regular intervals with an adhesive 55 made of a transparent epoxy resin or the like. ing.
[0040]
In this example, a two-component epoxy adhesive (XN1233) manufactured by Nagase Chemtech was used as the adhesive 55, and the curing conditions were 120 ° C. and 10 hours. The adhesive 55 has a refractive index substantially equal to the refractive index of glass 1.5 to 1.55 in order to ensure the transparency of the transparent display portion 25 (see FIG. 6) in the transparent EL display 20. 1.51 to 1.55 are used, and reflection generated at the interface between the cover glass 50 and the adhesive 55 is reduced.
[0041]
FIG. 6 is a plan view of the transparent EL display 20 of the present example having a one-sided electrode extraction structure. The transparent EL display 20 has a dot matrix transparent display section 25.
[0042]
That is, in this transparent EL display 20, a first transparent electrode 41 as a scanning electrode is formed in a vertical (upper and lower) stripe shape on a glass substrate 30, and a first insulating layer 42, a light emitting layer 43, Two insulating layers 44 are formed in this order, and a second transparent electrode 45 as a data electrode is formed on the second insulating layer 22 in a horizontal (left and right) stripe shape.
[0043]
As a result, the first transparent electrode 41 and the second transparent electrode 45 are arranged in a matrix, and light is emitted at the intersection thereof to perform dot display.
[0044]
In the transparent EL display 20, a connection terminal 26 is formed only on the upper edge of the transparent display 25, and the connection terminal 26 extends from each of the first transparent electrodes 41 and each of the second transparent electrodes 45. The provided transparent connection lines are connected. The connection terminal is connected to the flexible printed circuit board 70 via an anisotropic conductive adhesive (ACF) or the like, and is connected to the circuit board 60 having a drive circuit.
[0045]
By the way, in the present embodiment, as shown in FIG. 2, when the composite display device S1 is attached to the member to be attached, the light leakage surface 22 of the transparent EL display 20 overlapping the display area of the display device 10 is used. , The angle θ from the light leak surface 22 to the outside of the transparent EL display 20 toward the line of sight Y1 is 180 ° or more.
[0046]
By doing so, strong transmitted light (see FIG. 3) from the light leakage surface 22 of the transparent EL display 20 does not directly enter the eyes of the user K1. Therefore, it is possible to prevent the display of the display device 10 from being difficult to see due to the transmitted light from the light leakage surface 22 of the transparent EL display 20.
[0047]
In FIG. 2, the transparent EL display 20 is disposed above the display device 10, and the light leakage surface 22 of the transparent EL display 20 is positioned between the upper end and the lower end in the display area of the display device 10. At this time, the positional relationship is such that the line of sight of the user K1 is higher than the light leakage surface 22 at the time of use.
[0048]
Even in such a positional relationship, strong transmitted light (see FIG. 3) from the light leaking surface 22 of the transparent EL display 20 does not directly enter the eyes of the user K1. It is possible to prevent the display of the display device 10 from becoming difficult to see.
[0049]
FIG. 7 shows an example of mounting such a composite display device S1. FIG. 7 is a diagram showing an example in which the present composite display device S1 is actually mounted on the back of the driver's seat of a taxi as a member to be mounted. The effect in this case is as described above.
[0050]
In this mounting example, the information to be displayed on the transparent EL display 20 may be not only a text broadcast such as a weather forecast, a professional baseball bulletin, and a news bulletin, but also an advertisement if there is a possibility that an unspecified number of people may see it. .
[0051]
This can be used for a business in which the owner (in this case, a taxi company) of the composite display device S1 and a person who desires an advertisement make a contract (pay a contract fee to the owner) and perform an advertisement for a certain period of time.
[0052]
The conventional advertising method is a poster, a signboard, and the like.However, since it takes time to replace the poster and rewrite the signboard, if the combined display device as the electronic display is used as in the present embodiment, the data is changed. It is possible simply by doing.
[0053]
(2nd Embodiment)
FIG. 8 is a front view of the composite display device S2 according to the second embodiment of the present invention. FIG. 9 is a right side view in FIG.
[0054]
When the transparent EL display 20 is partially overlapped as in the first embodiment, since the user K1 can directly touch the end surface of the element substrate 30, the device may be broken. . Therefore, in the second embodiment, only the cover glass 50 of the transparent EL display 20 is disposed so as to cover the entire display area of the display device 10.
[0055]
By making the cover glass 50 arranged on the user (observer) side larger than the element substrate 30, the user cannot easily touch the element substrate 30. Further, the user cannot touch the display device 10. Therefore, there is no danger that the transparent EL display 20 or the display device 10 will be damaged.
[0056]
In addition, if the surface reflection of the cover glass 50 is a concern by disposing the cover glass 50 on the entire display device 10, as shown in FIG. 9, a known low reflection film 90 made of resin or the like is used. What is necessary is just to stick and arrange | position on the front surface of the cover glass 50.
[0057]
Further, when a liquid crystal display device is used as the display device 10, the low reflection film 90 is shared with the polarizing plate of the liquid crystal display device 10 on the back surface, so that one polarizing plate on the surface of the liquid crystal display device 10 is not required. There is an advantage that it becomes. By sticking the low-reflection film 90 in this way, even if the cover glass 50 is broken by any impact, scattering of the glass can be prevented.
[0058]
(Third embodiment)
FIG. 10 is a side view of the composite display device S3 according to the third embodiment of the present invention, and FIG. 11 is an enlarged view of a portion A in FIG. In the second embodiment, there is a problem that the end face of the element substrate 30 that contacts the air, that is, the light leakage surface 22 is conspicuous.
[0059]
Therefore, in the present embodiment, as shown in FIG. 10, a dummy substrate 100 made of the same material as the element substrate 30 (in this example, glass) is attached to the cover glass 50. This can be realized by attaching the dummy substrate 100 with the adhesive 55 at the same time as attaching the cover glass 50 to the element substrate 30.
[0060]
Thereby, the dummy substrate 100 is interposed between the display device 10 and the cover glass 50 so as to cover all of the display region of the display device 10 where the transparent EL display 20 is not superimposed.
[0061]
By doing so, in the front surface of the display area of the display device 10, all areas where the transparent EL display 20 does not exist are provided with the dummy substrate 100.
[0062]
Therefore, the transmitted light from the light leakage surface 22 passes through the dummy substrate 100 having the same refractive index as that of the element substrate 30 and passes from the end surface of the dummy substrate 100 located outside the display area of the display device 10 to the transmitted light. Can escape. As a result, the amount of transmitted light from the light leakage surface 22 that can be recognized by the user can be reduced.
[0063]
Here, in order to prevent light leakage from the end face (light leakage surface) 22 of the element substrate 30, the adhesive 55 is made of a member having a refractive index close to that of the element substrate 30 and the dummy substrate 100, as shown in FIG. Preferably, the adhesive 55 is interposed between the light leakage surface 22 of the transparent EL display 20 and the dummy substrate 100. Specifically, the adhesive 55 having a refractive index close to that of the glass described in the first embodiment is used.
[0064]
By interposing the adhesive 55 as a member having a refractive index close to that of the element substrate 30 and the dummy substrate 100 between the light leakage surface 22 and the dummy substrate 100, the transmitted light from the light leakage surface 22 When transmitted to the substrate 100, the leakage can be reduced, which is preferable.
[0065]
The dummy substrate 100 is not required if the element substrate 30 is made to have a size that covers the entire display area on the rear surface and the display area in the transparent EL display 20 is only the upper part. Increasing the size is not suitable for a mass production process because an unnecessary portion of the element substrate 30 becomes large and the number of chamfers decreases.
[0066]
(Fourth embodiment)
FIG. 12 is a front view of the composite display device S4 according to the fourth embodiment of the present invention. FIG. 13 is a right side view in FIG.
[0067]
In the present embodiment, the light absorbing member 110 is further provided on the end faces 22 and 23 of the element substrate 30 of the transparent EL display 20 in the first embodiment shown in FIG. Thereby, the degree of light leakage from these end faces 22 and 23 due to internal reflection of the element substrate 30 can be reduced, which is more effective in improving visibility.
[0068]
The light absorbing member 110 may be formed on an end surface of the cover glass 50. Specifically, the light absorbing member 110 can be formed by applying a black paint by a spray method. The present invention is not limited to this, and may be formed by printing, for example, or may be formed by attaching a tape-shaped material.
[0069]
(Other embodiments)
In FIG. 2 described above, the light leakage surface 22 of the transparent EL display 20 overlapping the display area of the display device 10 is in the horizontal direction. However, as shown in FIGS. Even when 22 is inclined from the horizontal plane, the angle θ between the light leakage surface and the direction of the line of sight during use may be 180 ° or more.
[0070]
In addition, even when the light leakage surface of the transparent display overlapping the display area of the display device is the upper end surface or the left and right end surfaces of the transparent display, at the time of mounting, the distance between the light leakage surface and the line-of-sight direction at the time of use. What is necessary is just to make the said angle (theta) 180 degrees or more.
[Brief description of the drawings]
FIG. 1 is a front view of a composite display device according to a first embodiment of the present invention.
FIG. 2 is a right side view in FIG.
FIG. 3 is an enlarged sectional view of the transparent EL display in FIG.
FIG. 4 is a schematic sectional view of an element substrate and an EL element in the transparent EL display shown in FIG.
FIG. 5 is a partially enlarged cross-sectional view of the transparent EL display in FIG.
FIG. 6 is a plan view of the transparent EL display in FIG. 1;
FIG. 7 is a diagram showing an example in which the composite display device shown in FIG. 1 is actually mounted on the back of the driver's seat of a taxi as a member to be mounted.
FIG. 8 is a front view of a composite display device according to a second embodiment of the present invention.
FIG. 9 is a right side view in FIG.
FIG. 10 is a side view of a composite display device according to a third embodiment of the present invention.
FIG. 11 is an enlarged view of a portion A in FIG.
FIG. 12 is a front view of a composite display device according to a third embodiment of the present invention.
FIG. 13 is a right side view in FIG.
FIG. 14 is a diagram showing another embodiment.
[Explanation of symbols]
10: display device, 20: transparent EL display as a transparent display,
22: light leakage surface, 30: element substrate, 50: cover glass, 55: adhesive
100 ... Dummy substrate, Y1 ... Gaze direction when using,
θ: An angle from the light leakage surface to the outside of the transparent EL display toward the line of sight.

Claims (5)

A composite display device comprising a display device (10) and a self-luminous type transparent display device (20) arranged on the front side of the display device so as to overlap a part of the display area of the display device is provided. In a mounting structure mounted on a mounting member, a light leakage surface (22) where light leakage occurs other than a display surface of the transparent display overlaps a display area of the display device,
An angle (θ) between the light leakage surface and the line of sight direction (Y1) at the time of use, which is directed from the light leakage surface to the outside of the transparent display and toward the line of sight, is 180 ° or more. A mounting structure for a composite display device, comprising: A composite display device comprising a display device (10) and a self-luminous type transparent display device (20) arranged on the front side of the display device so as to overlap a part of the display area of the display device is provided. In the mounting structure attached to the mounting member,
The transparent display is disposed on the upper portion of the display device,
A light leakage surface (22) where light leakage other than the display surface of the transparent display occurs, where the light leakage surface overlaps a portion between an upper end portion and a lower end portion in a display area of the display device;
A mounting structure for a composite display device, wherein the positional relationship is such that a line of sight during use is higher than the light leakage surface. 3. The composite according to claim 1, wherein a cover glass is provided on a front surface of the transparent display so as to cover an entire display area of the display device. 4. Display device mounting structure. The transparent display is provided between the display device (10) and the cover glass (50) so as to cover all of the display area of the display device on which the transparent display (20) is not superimposed. 4. The mounting structure according to claim 3, wherein a dummy substrate (100) made of the same material as the element substrate (30) of the container is provided. Between the light leak surface (22) of the transparent display (20) and the dummy substrate (100), an element substrate (30) of the transparent display and a member (55) having a refractive index close to that of the dummy substrate. The mounting structure of the composite display device according to claim 4, wherein a mounting member is interposed.

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