JP4115065B2 - Image display element and image display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image display device including, for example, a liquid crystal display (LCD) panel, a plasma display panel (PDP), an electroluminescent (EL) display panel, and the like, and more particularly to a structure of an image display element constituting the device. Is.
[0002]
[Prior art]
In order to realize a high-performance large-scale display at a low price, a system in which a plurality of flat displays (for example, LCD panels, PDPs, EL display panels, etc.) as image display elements (or display units) are arranged in a matrix ( For example, disclosed in Japanese Utility Model Publication No. 4-53675. FIG. 14 is a front view showing only two conventional image display elements 50 constituting a large display, and FIG. 15 is an enlarged side view showing a joint portion 51 of the conventional image display element 50.
[0003]
[Problems to be solved by the invention]
However, in a conventional large display, a sealing portion 55 that seals a light emitting layer (or liquid crystal layer) 54 between the front panel 52 and the back panel 53 at the end of each image display element 50; Since a lead line 56 for applying a voltage to an electrode (not shown) is provided, the sealing width g ₁ of the sealing portion 55 and the electrode lead-out allowance g ₂ provide the adjacent image display element 50. spacing G _a pixel 57 'is extremely larger than the spacing G _B pixels 57 in the same image display element 50 at the joint portion 51, there is a problem that noticeable seam section 51. Further, in order to uniform the arrangement pitch P1 of the pixel 57, when the pixel spacing G _B in the same image display element 50 to match the large pixel spacing G _A 'at the joint portion 51, the high brightness of the large display There has been a problem that the demand for brightening and high resolution cannot be achieved.
[0004]
Therefore, the present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to reduce the width of the seam portion when a plurality of sheets are arranged in a matrix. An object of the present invention is to provide an image display device and an image display device capable of achieving high brightness brightening and high resolution of an image.
[0005]
[Means for Solving the Problems]
The image display element according to claim 1 is provided between a front panel, a back panel facing the front panel at a predetermined interval, and between the front panel and the back panel, and a display state or a non-display state is selected. A plurality of pixels, a plurality of electrodes provided between the front panel and the back panel, for controlling display or non-display of the plurality of pixels, and between the front panel and the back panel A sealing portion that seals secretly, penetrates the back panel between two adjacent pixels , divides the back panel into a plurality of parts, and divides the electrode into a plurality of parts A gap; a plurality of terminals connected to the plurality of electrodes; and a plurality of terminals arranged in the gap; and a wiring arranged through the sealing portion and connecting the plurality of electrodes and the plurality of terminals. That It is a symptom.
[0006]
The image display element according to claim 2, wherein the plurality of electrodes includes a plurality of first electrodes arranged on the front panel side of the pixel and a plurality of electrodes arranged on the back panel side of the pixel. And the terminal includes a first terminal and a second terminal disposed in the gap on the inner surface of the front panel, and the wiring includes both sides of the gap in the sealing portion. And a first wiring that connects the first electrode and the first terminal, on both sides of the gap in the sealing portion. It is arranged through a portion that seals between the front panel and the back panel, and includes a second wiring that connects the second electrode and the second terminal .
[0007]
The image display element according to claim 3 is characterized in that a portion of the sealing portion provided on the outer periphery of the back panel has a sealing structure that does not allow wiring connected to the electrode to pass therethrough . .
[0008]
The image display element according to claim 4 is characterized in that the plurality of pixels are formed of a liquid crystal layer.
[0009]
The image display element according to claim 5 is characterized in that the plurality of pixels are formed of a light emitting layer.
[0010]
According to a sixth aspect of the present invention, there is provided an image display element comprising: a wiring layer formed on the outer surface of the back panel; and wire bonding for connecting the terminal and the wiring layer.
[0011]
According to a seventh aspect of the present invention, there is provided an image display device comprising a screen configured by arranging a plurality of image display elements according to any one of the first to sixth aspects in a matrix.
[0012]
The image display device according to claim 8 is characterized in that the arrangement interval of the pixels is constant over the entire screen.
[0013]
In the image display device according to the ninth aspect, the first interval between adjacent pixels between adjacent image display elements is equal to the second interval between adjacent pixels across the gap , and the same image. In the display element, a third interval between adjacent pixels without sandwiching the gap is narrower than the first interval and the second interval.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
FIG. 1 is a front view schematically showing a case where image display elements 10 according to Embodiment 1 of the present invention are arranged in two rows and two columns on the same plane. 2 is a schematic side view of FIG. 1, FIG. 3 is an enlarged view of part A in FIG. 2, and FIG. 4 is an enlarged view of part B in FIG. A large-screen image display device (not shown) according to the present invention has a screen in which a large number of image display elements 10 shown in FIG. 1 are arranged in a matrix. The image display element 10 is a flat display unit such as an LCD panel, a PDP, or an EL display panel.
[0015]
As shown in any of FIGS. 1 to 4, the image display element 10 according to the first embodiment includes a front panel 11 and a back panel 12 made of a glass plate or the like. The front panel 11 and the back panel 12 are opposed to each other with a predetermined interval. Further, the image display element 10 is provided between the front panel 11 and the back panel 12, and is provided between the front panel 11 and the back panel 12, and a plurality of pixels 13 whose display state or non-display state is selected. And a plurality of electrodes (not shown in FIGS. 1 to 4) for controlling display or non-display of the plurality of pixels 13. The pixels 13 are formed in a light emitting layer (or liquid crystal layer) 14 provided between the front panel 11 and the back panel 12. The pixel 13 includes, for example, a plurality of row electrodes (not shown in FIGS. 1 to 4) disposed on the front panel 11 side of the light emitting layer 14 and a plurality of rows electrodes disposed on the back panel 12 side of the light emitting layer 14. The column electrode (not shown in FIGS. 1 to 4) is formed in a portion (overlapping portion) that faces the column electrode.
[0016]
In the first embodiment, the back panel 12 is divided into a first part 12a and a second part 12b, and a gap 15 is formed between the first part 12a and the second part 12b. Is formed. As shown in FIG. 4, terminals 22 (FIG. 4) connected to the row electrodes and the column electrodes (not shown in FIGS. 1 to 4) are formed in the gap 15. However, the back panel 12 is not necessarily divided into two parts as long as the terminal 22 can be exposed (for example, a structure having a through window). Further, the back panel 12 may be divided into three or more to increase the number of through portions. The position to be divided is not necessarily the center of the image display element 10, and may be another position as long as it is between adjacent pixels 13 in the same image display element 10.
[0017]
5 to 10 are diagrams showing manufacturing steps of the image display element 10 (for example, organic EL) of the first embodiment. Here, FIGS. 5A and 5B, FIGS. 6A and 6B, FIGS. 7A and 7B, and FIGS. 8A and 8B are a front view and a cross section, respectively. FIG. 9 and FIG. 10 are sectional views.
[0018]
When manufacturing the image display element 10, first, as shown in FIGS. 5A and 5B, the row electrode 21, the terminal 22, and the row electrode 21 are connected to the terminal 22 on the inner surface of the front panel 11. A wiring 23 is formed. The row electrode 21 is composed of a transparent electrode such as ITO so that light from the light emitting layer (not shown in FIG. 5) can be transmitted. The terminals 22 and the wirings 23 are simultaneously formed of the same material. For example, the terminals 22 and the wirings 23 are formed on the front panel 11 by thick film printing of silver (Ag) or the like and are electrically connected to the row electrodes 21.
[0019]
Next, as shown in FIGS. 6A and 6B, the light emitting layer 14 is formed so as to cover the row electrodes 21. The light emitting layer 14 is, for example, an organic EL layer.
[0020]
Next, as shown in FIGS. 7A and 7B, the column electrode 24 is formed in a direction orthogonal to the row electrode 21 with the light emitting layer 14 interposed therebetween. Each column electrode 24 is connected to a terminal 22 by a wiring 25. The wiring 25 is also formed by, for example, thick film printing of silver (Ag). Here, the case where the four row electrodes 21, the four column electrodes 24, and the eight terminals 22 are provided has been described, but the present invention is not limited to these numbers.
[0021]
Next, as shown in FIGS. 8A and 8B, the back panel 12 is disposed to face the front panel 11. Here, the back panel 12 includes a first portion 12a and a second portion 12b. The inner side of the back panel 12 is sealed with a filler 26 in a secret manner. At this time, the terminal 22 electrically connected to the electrode 21 or 24 is not covered with the filler 26 and is exposed in the gap 15 of the back panel 12.
[0022]
Next, as shown in FIG. 9, electrode pins 27 are vertically erected on the terminals 22 in the gap 15 of the back panel 12 using a conductive paste or the like, and on the back panel 12 as shown in FIG. 10. The plug 28 is attached. At this time, the electrode pin 27 and the electrode 29 of the plug 28 are electrically connected via a wiring route (not shown) in the plug 28. The electrode 29 of the plug 28 extends perpendicularly to the back panel 12. For this reason, the image display element 10 can be mounted simply by inserting the electrode 29 of the plug 28 into a socket formed on a substrate (not shown) for holding a large number of image display elements 10. Since the image display element 10 can be removed simply by pulling 10 out, work efficiency in maintenance is good.
[0023]
As described above, the image display element 10 according to the first embodiment is provided with a portion that penetrates the back panel 12 between two adjacent pixels in the same image display element 10, that is, a gap 15. A terminal 22 connected to the electrode 21 or 24 is provided in the gap 15. Therefore, as shown in FIG. 1, the distance G _A most adjacent pixels 13 each other mutual image display device 10 adjacent to each twice the sealing width g ₁ of the sealing portion shown in FIG. 3 ( That is, it can be slightly wider than 2 × g ₁ ) (that is, 2 × g ₁ + α (α can be made substantially zero), and in the conventional joint 51 shown in FIG. For this reason, in the screen in which the image display elements 10 of Embodiment 1 are arranged in a matrix, the joint portion of the image display elements 10 can be made smaller than the pixel interval (that is, 2 × (g ₁ + g ₂ )). 51 can be made inconspicuous.
[0024]
Further, in the image display element 10 of the first embodiment, as shown in FIG. 4, the interval G _C between the adjacent pixels 13 with the gap 15 interposed therebetween is twice the sealing width g ₁ of the sealing portion. The width is the sum of the formation region β of the terminal 22 (that is, 2 × g ₁ + β). However, this pixel interval G _C can also be made narrower than the pixel interval G _A ′ (that is, 2 × (g ₁ + g ₂ )) in the joint portion 51 in the conventional case shown in FIG. It can be inconspicuous enough to give an unnatural impression.
[0025]
For this reason, while reducing the arrangement pitch of the pixels 13, the gap G _A between the adjacent pixels 13 between the adjacent image display elements 10, and the gap G _C between the adjacent pixels 13 across the gap 15, it is possible to equalize the distance G _B pixels 13 adjacent to each other without interposing the gap 15 in the same image display device 10. Therefore, according to the image display device having a screen configured by arranging the image display elements 10 of Embodiment 1 in a matrix, an image with high luminance and high resolution can be displayed.
[0026]
Embodiment 2
FIG. 11 is a front view schematically showing a case where the image display elements 10 according to the second embodiment of the present invention are arranged in two rows on the same plane. The image display element of the second embodiment is different from the first embodiment in the arrangement pitch of the pixels 13. As shown in FIG. 11, in the image display device 40 of the second embodiment, adjacent pixels 13 to each other across the image display device 40 pixel 13 intervals G _A and the gap 15 between the closest between mutually adjacent equal to the distance G _C of the spacing G _B pixels 13 adjacent to each other without interposing the gap 15 in the same image display element 40 is, constitutes narrower than the distance G _a and the distance G _C. In this case, the area of the light emitting pixel with respect to the area of the display screen can be increased, and the luminance can be improved by the increased amount. The second embodiment is the same as the first embodiment except for the points described above.
[0027]
Embodiment 3
FIG. 12 is a front view of the image display element 41 according to Embodiment 3 of the present invention as viewed from the back panel 12 side. FIGS. 13A and 13B are views showing a state in which the electrode plug 33 is attached to FIG. A wiring layer 31 is provided on the back surface of the back panel 12 of the image display element of Embodiment 3 by printing or the like. Since the wiring layer 31 can be formed in an arbitrary pattern, the structure of the plug 33 and the arrangement of the electrodes of the plug 33 can also be designed arbitrarily. The terminals 22 in the gap 15 between the wiring layer 31 and the back panel 12 are connected by wire bonding 32. By reducing the thickness of the back panel 12, the gap 15 necessary for drawing can be shortened. In conjunction with the shortening of the gap 15, the interval between the pixels 13 can be shortened, and the resolution of the displayed image can be increased. Further, by mounting the plug 33 on the back surface of the image display element 41, a display device in which a large number of image display elements 41 can be freely attached to and detached from a substrate (not shown) can be realized. The electrode 34 of the plug 33 and the wiring layer 31 formed on the back panel 12 are connected by wire bonding 35. With such a configuration, a lead frame or the like for drawing out the electrode of the image display element 10 is not necessary, and accordingly, the cost can be reduced and the reliability can be improved. Further, when the wire bondings 32 and 35 are molded with resin or the like, the reliability is further increased. In the third embodiment, points other than the above are the same as those in the first or second embodiment.
[0028]
【The invention's effect】
As described above, according to the first to sixth aspects of the present invention, the gap penetrating the back panel is provided between two adjacent pixels in the same image display element, and the terminal is disposed in the gap . Therefore, the interval between the adjacent pixels between the adjacent image display elements can be reduced, and the joint portion of the image display elements can be made inconspicuous, and as a result, the image is displayed on the screen constituted by the image display elements. There is an effect that high brightness and high resolution of the image can be achieved.
[0029]
According to the seventh to ninth aspects of the present invention, the interval between the adjacent pixels between adjacent image display elements can be narrowed, so that the joint between the image display elements can be made inconspicuous. As a result, there is an effect that high brightness and high resolution of the image can be achieved.
[0030]
According to the invention of claim 9, since the pixel area can be increased, there is an effect that it is possible to achieve high brightness of the image.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a case where image display elements according to Embodiment 1 of the present invention are arranged in two rows and two columns on the same plane.
FIG. 2 is a schematic side view of FIG. 1;
FIG. 3 is an enlarged view of a part A in FIG. 2;
FIG. 4 is an enlarged view of a portion B in FIG.
FIGS. 5A and 5B are a front view (No. 1) and a longitudinal sectional view (No. 1) showing a manufacturing process of the image display element of FIG. 1, respectively.
FIGS. 6A and 6B are a front view (No. 2) and a longitudinal sectional view (No. 2) showing a manufacturing process of the image display element of FIG. 1, respectively.
FIGS. 7A and 7B are a front view (No. 3) and a longitudinal sectional view (No. 3) showing a manufacturing process of the image display element of FIG. 1, respectively.
FIGS. 8A and 8B are a front view (No. 4) and a longitudinal sectional view (No. 4) showing a manufacturing process of the image display element of FIG. 1, respectively.
9 is a longitudinal sectional view (No. 5) showing a manufacturing process of the image display element of FIG. 1; FIG.
10 is a longitudinal sectional view (No. 6) showing a manufacturing process of the image display element in FIG. 1; FIG.
FIG. 11 is a front view schematically showing a case where image display elements according to the second embodiment of the present invention are arranged in two rows on the same plane.
FIG. 12 is a front view schematically showing a back panel side of an image display element according to Embodiment 3 of the present invention.
FIGS. 13A and 13B are a front view and a side view, respectively, schematically showing a state in which a plug is attached to the back panel of the image display element of FIG.
FIG. 14 is a front view showing two of image display elements constituting a conventional large display.
15 is an enlarged side view showing a joint portion of the image display element in FIG. 14;
[Explanation of symbols]
10, 40, 41 Image display element, 11 Front panel, 12 Back panel, 12a First part, 12b Second part, 13 pixels, 14 Light emitting layer, 15 Gap, 21 Row electrode, 22 Terminal, 23, 25 Wiring , 24 column electrodes, 26 fillers, 27 electrode pins, 28, 33 plugs, 29 plug electrodes, 32, 35 wire bonding, 51 joints, GA _A spacing between adjacent pixels between adjacent image display elements G _C Interval between adjacent pixels across the gap, G _B Interval between adjacent pixels in the same image display element without interposing the gap.

Claims (9)

A front panel;
A back panel facing the front panel with a predetermined interval;
A plurality of pixels provided between the front panel and the back panel, the display state or the non-display state being selected;
A plurality of electrodes provided between the front panel and the back panel, for controlling display or non-display of the plurality of pixels ;
In an image display element having a sealing portion that secretly seals between the front panel and the back panel ,
A gap that penetrates the back panel between two adjacent pixels , divides the back panel into a plurality of portions, and divides the electrode into a plurality of portions;
A plurality of terminals connected to the plurality of electrodes and disposed within the gap ;
An image display element comprising: wirings arranged through the sealing portion and connecting the plurality of electrodes and the plurality of terminals . The plurality of electrodes includes a plurality of first electrodes arranged on the front panel side of the pixel and a plurality of second electrodes arranged on the back panel side of the pixel,
  The terminal includes a first terminal and a second terminal disposed in the gap on the inner surface of the front panel,
The wiring is disposed through a portion of the sealing portion that seals between the front panel and the back panel on both sides of the gap, and connects the first electrode and the first terminal. A wiring and a second wiring that is disposed through a portion of the sealing portion that seals between the front panel and the back panel on both sides of the gap, and connects the second electrode and the second terminal. And including
The image display element according to claim 1. 3. The image display element according to claim 1, wherein, of the sealing portion, a portion provided on an outer periphery of the back panel has a sealing structure that does not allow wiring connected to the electrode to pass therethrough. .   4. The image display element according to claim 1, wherein the plurality of pixels are formed of a liquid crystal layer.   The image display element according to claim 1, wherein the plurality of pixels are made of a light emitting layer. A wiring layer formed on the outer surface of the back panel;
The image display element according to any one of claims 1 to 5, further comprising: wire bonding for connecting the terminal and the wiring layer.   7. An image display apparatus comprising a screen configured by arranging a plurality of image display elements according to claim 1 in a matrix.   The image display device according to claim 7, wherein the pixel arrangement interval is constant over the entire screen. The first interval between adjacent pixels between adjacent image display elements is equal to the second interval between adjacent pixels across the gap ,
8. The image display device according to claim 7, wherein a third interval between adjacent pixels without narrowing the gap in the same image display element is narrower than the first interval and the second interval. .

Images