JP4459640B2 - Display device - Google Patents

Description

  The present invention relates to a display device that displays a predetermined image with two substrates facing each other.

  A first substrate having one or more layers formed on a main plane and a second substrate having one or more layers formed on the main plane, the first and 2. Description of the Related Art Display devices that display a predetermined image with each main plane of a second substrate facing each other are widely used. Examples of such a display device include a plasma display panel (PDP) and a liquid crystal display (LCD).

  When combining the first and second substrates so as to face each other, an alignment marker for assembly is formed on any one layer of each substrate, and the alignment markers on each substrate are overlapped, Alignment between the first and second substrates is performed.

  FIG. 8 is a schematic view showing an example of an alignment marker.

  As shown in FIG. 8, for example, a cross-shaped first alignment marker 201 is formed on any layer of the first substrate, and a circle 202 and its center point 203 are formed on any layer of the second substrate. A second alignment marker 204 is formed.

  By aligning the center of the cross-shaped first alignment marker 201 with the center point 203 of the circle 202, alignment between the first substrate and the second substrate is performed.

  In general, a certain amount of misalignment can be avoided between a component of a display device formed in one layer (for example, a light shielding layer or an electrode layer) and another component formed in another layer. Absent. Further, when the display device is assembled, a certain amount of assembly displacement between the first substrate and the second substrate is unavoidable.

  For this reason, when the alignment marker is formed on a single layer, the above-mentioned positional deviation is not caused between the component of the display device formed on the layer and the other component of the display device formed on another layer. As a result, both of the assembly displacements exist, and as a result, there arises a problem that the accuracy of alignment between the components cannot be increased.

  Hereinafter, the above problem will be described using a plasma display panel display device as an example.

  FIG. 9 is an exploded perspective view showing an example of the structure of one display cell in the plasma display panel display device. First, the structure of the plasma display panel display device will be described with reference to FIG.

  As shown in FIG. 9, in this display cell, a front substrate 351 (a substrate closer to the viewer) and a back substrate 352 are provided in parallel to each other.

  The front substrate 351 includes an insulating substrate 302 formed of glass or other transparent material, a plurality of scanning electrodes 303 and a common electrode 304 formed on the surface of the insulating substrate 302 facing the back substrate 352, and the scanning electrode 303. The bus electrode 305 formed above, the bus electrode 306 formed on the common electrode 304, and the dielectric layer formed on the insulating substrate 302 so as to cover the scan electrode 303, the common electrode 304, and the bus electrodes 305 and 306 312, a black dielectric layer 312 a formed on the dielectric layer 312 as a light shielding layer, and a protective layer 313 formed so as to cover the dielectric layer 312 and the black dielectric layer 312 a.

  The scanning electrodes 303 and the common electrodes 304 are alternately arranged in parallel with each other at a predetermined interval.

  The bus electrodes 305 and 306 are formed on the scanning electrode 303 and in order to reduce the electrode resistance value of the common electrode 304.

  The protective layer 313 is formed to protect the dielectric layer 312 from discharge, and is made of, for example, magnesium oxide (MgO).

  The black dielectric layer 312a extends in a direction orthogonal to the bus electrodes 305 and 306, and the black dielectric layer 312a is disposed so as to overlap the vertical partition 315a when the front substrate 351 and the rear substrate 352 are combined. .

  The back substrate 352 includes a plurality of insulating substrates 301 made of glass or other transparent material, and a plurality of back substrates 352 formed on the surface of the insulating substrate 301 facing the front substrate 351 so as to extend in a direction perpendicular to the scanning electrodes 303 and the common electrodes 304. Data electrode 307 (only one is shown in FIG. 9), a dielectric layer 314 formed on the insulating substrate 301 so as to cover the data electrode 307, a partition wall 315 formed on the dielectric layer 314, The phosphor layer 311 is formed on the surface of the dielectric layer 314 and the side surfaces of the partition walls 315.

  The partition wall 315 secures a discharge gas space and partitions the display cell (pixel) 308.

  When viewed from the direction perpendicular to the surface of the insulating substrate 301, the shape of the partition wall 315 is a grid pattern (lattice shape). The partition wall 315 includes a vertical partition wall 315 a extending in the same direction as the data electrode 317 extends, and It consists of a horizontal partition 315b extending in a direction orthogonal to the direction in which 315a extends.

  The display cell 308 is filled with a discharge gas made of helium, neon, xenon, or another rare gas or a mixed gas of these rare gases. The phosphor layer 311 emits visible light 310 in response to ultraviolet rays generated by the discharge of the discharge gas.

  Note that a region between the front substrate 351 and the rear substrate 352 is divided into a central display region and a non-display region which is a peripheral portion surrounding the display region. Among these, the image is displayed in the display area.

  When the front substrate 351 and the rear substrate 352 are combined in an opposed state, for example, the first alignment marker 201 shown in FIG. 8 is formed in the same layer as the black dielectric layer 312a of the front substrate 351, and further, The second alignment marker 204 shown in FIG. 8 is formed in the same layer as the partition wall 315 of the back substrate 352. By aligning the center of the first alignment marker 201 with the center of the second alignment marker 204, alignment between the front substrate 351 and the back substrate 352 is performed.

  In this case, as described above, the positional deviation amount between the black dielectric layer 312a where the first alignment marker 201 is formed and the partition wall 315 is the amount of assembly deviation between the front substrate 351 and the rear substrate 352. be equivalent to. On the other hand, the amount of positional deviation between the bus electrodes 305 and 306 and the partition wall 315 includes the amount of assembly deviation between the front substrate 351 and the rear substrate 352, the bus electrodes 305 and 306, and the black dielectric layer 312a. It is equal to the sum of the positional deviation amount between.

For example, as shown in FIG. 10, the amount of assembly displacement between the front substrate 351 and the back substrate 352 (the amount of displacement between the black dielectric layer 312a and the partition wall 315) is ± 35 μm, and the bus electrodes 305 and 306 Assuming that the misalignment between the black dielectric layer 312a is ± 20 μm, the misalignment between the partition wall 315 and the bus electrodes 305 and 306 is (± 35 μm) + (± 20 μm) = ± 55 μm.
It becomes.

  As described above, when the amount of misalignment between the partition wall 315 and the bus electrodes 305 and 306 increases, the planar area of the discharge gas space, and consequently the opening area, decreases, and accordingly, it is possible to avoid a decrease in luminance. Absent. Furthermore, as the amount of positional deviation between the partition wall 315 and the bus electrodes 305 and 306 increases, the area where the electrode is hidden increases, and as a result, the counter discharge voltage increases and the power consumption increases.

  For this reason, many measures for reducing the amount of positional deviation between the partition wall 315 and the bus electrodes 305 and 306 have been proposed so far.

  As an example, a substrate described in JP-A No. 200-215816 (Patent Document 1) will be described below.

  FIG. 11 is a plan view of a substrate 400 proposed in the publication. The substrate 400 constitutes the back substrate of the plasma display panel.

  A plurality of partition walls 401 are formed on the substrate 400 at regular intervals and in parallel to each other, and electrodes 402 are formed between adjacent partition walls 401 in parallel to the partition walls 401. As shown in FIG. 11, each of the partition 401 and the electrode 402 is formed as a regular pattern. Further, alignment patterns 404 are formed at the four corners of the substrate 400 while maintaining a relative positional relationship with the partition wall 401, and further with a relative positional relationship maintained with the electrode 402. Thus, an alignment pattern 405 is formed.

  The alignment pattern 404 includes a circle, and the alignment pattern 405 includes a ring shape concentric with the circle forming the alignment pattern 404.

When the substrate 400 is combined with the other substrate (front substrate), it is positioned between the alignment pattern formed on the other substrate (front substrate) using the two alignment patterns 404 and 405. Matching is done.
JP 2000-215816 A (FIG. 6)

  However, the substrate 400 shown in FIG. 11 has the following problems.

  Here, consider a case where the first substrate 501 and the second substrate 502 as shown in FIG. 12 are combined.

  On the first substrate 501, lattice-like structures 503 (layers such as an electrode layer and a partition layer) extending in both the vertical and horizontal directions in FIG. 12 are formed, and the second alignment markers shown in FIG. An alignment marker 504 having the same shape as 204 is formed. On the second substrate 502, a line-shaped structure 505 extending in the horizontal direction in FIG. 12 and a line-shaped structure 506 extending in the vertical direction in FIG. 12 are formed. In addition, alignment markers 507 having the same shape as the alignment patterns 404 and 405 shown in FIG. 11 are formed at the four corners of the second substrate 502.

  The structure 503 is required to have assembly accuracy in both the vertical and horizontal directions in FIG. 12, the structure 505 is required to have vertical assembly accuracy in FIG. 12, and the structure 506 is required to have horizontal assembly accuracy in FIG. It shall be.

  FIG. 13 is a conceptual diagram showing the amount of positional deviation that occurs when the first substrate 501 and the second substrate 502 are combined.

  When the first substrate 501 and the second substrate 502 are combined, when the center of the alignment marker 504 and the center of the alignment pattern 405 in the alignment marker 507 are first aligned, the structure 503 and the structure 505 are aligned. The amount of misalignment between them is equal to the amount of misalignment between the first substrate 501 and the second substrate 502.

  Next, when the center of the alignment marker 504 and the center of the alignment pattern 404 in the alignment marker 507 are to be aligned, these centers do not coincide with each other, and as a result, the structure 503 and the structure 506 are not aligned. Is equal to the sum of the amount of assembly displacement between the first substrate 501 and the second substrate 502 and the amount of displacement between the structure 505 and the structure 506.

  As described above, even with the substrate 400 (FIG. 11) described in Patent Document 1, the problem of an increase in the amount of misalignment between structures formed on the two substrates has not been solved.

  Although the above description has been made taking a plasma display panel as an example, the above problem is not a problem peculiar to the plasma display panel, but is common to display devices of a type in which two substrates are combined with each other for display. It is a problem to do.

  The present invention has been made in view of the above problems, and in a display device that displays a predetermined image with two substrates each having an electrode layer and other layers formed facing each other, An object of the present invention is to provide a display device that can prevent an increase in the amount of misalignment between layers formed on each of two substrates.

  In order to achieve this object, the present invention provides a first substrate on which at least N layers (N is a positive integer of 2 or more) are formed on a main plane, and at least one layer on the main plane. A display device configured to display a predetermined image with the main plane of the first substrate and the main plane of the second substrate facing each other. Each of the at least N layers of the first substrate is formed with a first alignment marker composed of lines extending in different directions, and the at least one layer of the second substrate has a center A second alignment marker composed of an arbitrary figure having a point is formed, and the first substrate and the second alignment marker are overlapped by overlapping the first alignment marker on the center point of the second alignment marker. Base of It provides a display device characterized by alignment is performed between.

  The different directions are preferably layers in which the first alignment marker is formed, and are parallel to each of the N layers constituting the display device.

  The present invention comprises a first substrate having at least two layers formed on a main plane, and a second substrate having at least one layer formed on the main plane. In the display device for displaying a predetermined image with the main plane of the substrate and the main plane of the second substrate facing each other, one of the at least two layers of the first substrate has a first A first alignment marker comprising a line extending in one direction is formed, and a line extending in a second direction orthogonal to the first direction is formed on the other of the at least two layers of the first substrate. A second alignment marker is formed, and the at least one layer of the second substrate is formed with a third alignment marker having an arbitrary figure having a center point. And the second By superimposing the Imentomaka to the central point of the third alignment markers, to provide a display apparatus characterized by alignment between the first substrate and the second substrate is carried out.

  The first direction is a layer in which the first alignment marker is formed, and is preferably a direction parallel to a layer constituting one component of the display device.

  A circle can be selected as the arbitrary figure constituting the second alignment marker or the third alignment marker.

  The first, second, third, first and second alignment markers are preferably formed outside the display area.

  The display device according to the present invention can be configured as a plasma display device, for example. In this case, it is preferable that the first and second substrates include a front substrate and a back substrate, respectively, and the at least two layers of the first substrate are a light shielding layer and a bus electrode layer. The at least one layer of the second substrate is preferably a partition layer.

  The display device according to the present invention can also be configured as a liquid crystal display device or a cold cathode field emission display.

  In a conventional display device that displays a predetermined image with two substrates facing each other, an alignment marker is formed on a single layer of each substrate, so when combining the two substrates facing each other, In addition to the assembly displacement between the two substrates, a positional displacement between the two layers occurred.

  On the other hand, in the display device according to the present invention, for example, linear alignment markers orthogonal to each other are formed on each of the two layers of one substrate. The positional deviation can be eliminated, and it is possible to suppress only the assembly deviation between the two substrates. For this reason, according to the display device according to the present invention, it is possible to prevent an increase in the amount of positional deviation between the layers formed on each of the two substrates.

(First embodiment)
The display device according to the first embodiment of the present invention is configured as a plasma display device. Its structure is the same as that of the plasma display device shown in FIG.

  However, in the front substrate 351 as the first substrate of the plasma display device as the display device according to the present embodiment, the first alignment marker 10 is formed in the same layer as the black dielectric layer 312a, and the bus electrode The second alignment marker 11 is formed in the same layer as the layers 305 and 306.

  The first alignment marker 10 and the second alignment marker 11 are shown in FIG.

  As shown in FIG. 1, the first alignment marker 10 is composed of a line extending in the first direction, and the second alignment marker 11 is composed of a line extending in a second direction orthogonal to the first direction. Here, as the first direction, a direction in which the black dielectric layer 312a in the same layer as the first alignment marker 10 extends is selected. This first direction is a direction orthogonal to the direction 10A in which the positional accuracy of the black dielectric layer 312a is required. Similarly, the second direction orthogonal to the first direction selects a direction in which the bus electrode layers 305 and 306 in the same layer as the second alignment marker 11 extend. This second direction is a direction orthogonal to the direction 11A in which the positional accuracy of the bus electrode layers 305 and 306 is required.

  As shown in FIG. 1, a circle 13 having a center point 12 is formed on the back substrate 352 as a third alignment marker 14.

  FIG. 2 is a perspective view showing the formation position of each alignment marker.

  As shown in FIG. 2, the first alignment marker 10 and the second alignment marker 11 are formed at the four corners of the front substrate 351. Similarly, the third alignment markers 14 are formed at the four corners of the back substrate 352.

  In the plasma display device as the display device according to the present embodiment, the line-shaped first alignment marker 10 is overlapped with the center point 12 of the third alignment marker 14 and the line-shaped second alignment marker 10 is overlapped. By making the alignment marker 11 overlap the center point 12 of the third alignment marker 14, that is, so that the intersection of the first alignment marker 10 and the second alignment marker 11 overlaps the center point 12. Alignment between the front substrate 351 as the first substrate and the back substrate 352 as the second substrate is performed.

  FIG. 3 is a conceptual diagram showing the effect of the display device according to the present embodiment.

  For example, as in the case of FIG. 10, the assembly displacement amount between the front substrate 351 and the back substrate 352 (that is, the displacement amount between the black dielectric layer 312a and the partition 315) is ± 35 μm, and the bus electrode 305 , 306 and the black dielectric layer 312a are assumed to be ± 20 μm, the vertical positional deviation between the partition walls 315 and the bus electrodes 305 and 306 is ± 35 μm. The amount of lateral displacement between the layer 312a is also ± 35 μm.

  In the case of the conventional display device shown in FIG. 10, both the misalignment amount between the partition wall 315 and the bus electrodes 305 and 306 and the misalignment amount between the partition wall 315 and the black dielectric layer 312a are both bus electrode 305. , 306 and the black dielectric layer 312a are added to each other. However, according to the display device of this embodiment, the bus electrodes 305 and 306 and the black dielectric layer 312a are added. It is possible to ignore the positional deviation amount ± 20 μm between the front substrate 351 and the position accuracy between the front substrate 351 and the rear substrate 352 accordingly.

FIG. 4 shows the amount of positional deviation (unit: μm) between the partition 315 and the black dielectric layer 312a in the plasma display device having the structure shown in FIG. 9, and the luminance (unit: cd / cm ² ) of the display device. It is a graph which shows correlation of these.

  As shown in FIG. 4, the luminance decreases as the positional shift amount increases.

In the plasma display device as the display device according to the present embodiment, as described above, the positional deviation amount between the partition 315 and the black dielectric layer 312a is 35 μm. In the conventional plasma display device, the partition 315 and the black positional deviation amount between the dielectric layer 312a is 55 .mu.m, brightness corresponding to these positional shift amount is 4, each about 80 cd / cm ^2, about 67cd / cm ^2.

  Thus, according to the display device according to the present embodiment, the luminance can be improved by (80−67) /67=19.4 (%) as compared with the conventional display device.

  FIG. 5 shows the correlation between the amount of positional deviation (unit: μm) between the barrier ribs 315 and the black dielectric layer 312a in the plasma display device having the structure shown in FIG. 9 and the discharge voltage (unit: V) of the display device. It is a graph which shows a relationship.

  As shown in FIG. 5, the discharge voltage increases as the positional deviation amount increases.

  In the plasma display device as the display device according to the present embodiment, as described above, the positional deviation amount between the partition 315 and the black dielectric layer 312a is 35 μm. In the conventional plasma display device, the partition 315 and the black The amount of misalignment with the dielectric layer 312a is 55 μm, and the discharge voltages corresponding to these misregistration amounts are about 52V and about 62V, respectively, from FIG.

  Thus, according to the display device according to the present embodiment, the discharge voltage can be reduced by (62−52) /62=16.1 (%) as compared with the conventional display device.

  In the conventional display device, when the amount of positional deviation between the partition wall 315 and the bus electrodes 305 and 306 increases, the planar area of the discharge gas space, and consequently the opening area of the display cell, decreases. It was inevitable that the luminous efficiency decreased. Furthermore, as the amount of displacement between the partition wall 315 and the bus electrodes 305 and 306 increases, the area where the electrode is hidden increases, and as a result, the counter discharge voltage increases and the power consumption increases.

  On the other hand, according to the display device according to the present embodiment, as shown in FIGS. 4 and 5, the luminance can be improved and the discharge voltage can be reduced as compared with the conventional display device. be able to.

  The first embodiment is not limited to the configuration as described above, and various modifications can be made.

  For example, although the first alignment marker 10 and the second alignment marker 11 are both formed in a line shape, any shape can be selected as long as the shapes can define two directions orthogonal to each other. it can. For example, a broken line or a dotted line can be used.

  Moreover, although the 3rd alignment marker 14 was formed as the circle | round | yen 13 which has the center point 12, the shape of the 3rd alignment marker 14 is not limited to a circle | round | yen. Any graphic can be selected as long as it can identify the center point. For example, as the third alignment marker 14, an ellipse, a regular triangle, a square, other regular polygons, a star shape, a cross shape, or the like can be selected.

  In addition, the first linear alignment marker 10 is formed to be parallel to the black dielectric layer 312a. However, for the convenience of forming the first alignment marker 10, the linear first alignment marker 10 forms an angle with the black dielectric layer 312a. It is possible to form as follows. Also in this case, the second alignment marker 11 is formed so as to be orthogonal to the first alignment marker 10.

  In the display device according to the present embodiment, the first alignment marker 10, the second alignment marker 11, and the third alignment marker 14 are formed at the four corners of each substrate. The second alignment marker 11 can be formed in any position as long as it is in the non-display area of the front substrate 351, that is, in the area outside the display area. Similarly, the third alignment marker 14 is the rear substrate. It can be formed at an arbitrary position as long as it is within the non-display area 352, that is, outside the display area.

  In the display device according to the present embodiment, the first alignment marker 10 and the second alignment marker 11 are formed in the same layer as the black dielectric layer 312a and the bus electrode layers 305 and 306, respectively. The layers forming the one alignment marker 10 and the second alignment marker 11 are not limited to the black dielectric layer 312a and the bus electrode layers 305 and 306, but a layer that requires positional accuracy with respect to the partition layer 315. Any layer can be selected.

  In the display device according to the present embodiment, the two alignment markers 10 and 11 are set as the alignment markers formed on the front substrate 315. However, the number of alignment markers formed on the front substrate 315 is not limited to two. It is also possible to form three or more alignment markers on the front substrate 315. For example, if there are M layers (M is a positive integer greater than or equal to 3) on the front substrate 315 that require positional accuracy, M alignment markers can be formed on the front substrate 315. In this case, the M alignment markers can be formed as lines extending in different directions, for example. By superimposing each of these lines on the center point 12 of the third alignment marker 14 formed on the back substrate 352, the positional accuracy of each of the M layers with respect to the partition layer 315 formed on the back substrate 352 is improved. Can be made.

(Second embodiment)
The display device according to the second embodiment of the present invention is configured as a liquid crystal display device. FIG. 6 is a cross-sectional view of a liquid crystal display device as a display device according to the present embodiment.

  The liquid crystal display device functions as a transmissive liquid crystal display device having a backlight as a light source, a reflective liquid crystal display device having a reflector instead of the backlight and using ambient light as a light source, and a transmissive liquid crystal display device And a transflective liquid crystal display device having both a transmissive region and a reflective region functioning as a reflective liquid crystal display device.

  The liquid crystal display device as the display device according to the present embodiment is configured as a transflective liquid crystal display device.

  A liquid crystal display device 100 as a display device according to this embodiment includes a first substrate 101, a second substrate 102, and a liquid crystal layer 103 sandwiched between the first substrate 101 and the second substrate 102. Yes.

  The second substrate 102 is formed on the second insulating transparent substrate 104, the counter electrode 105 made of ITO (Indium Tin Oxide) formed on the second transparent substrate 104 on the liquid crystal layer 103 side, and the counter electrode 105. An alignment film 106, an optical compensator 107 formed on the second insulating transparent substrate 104 on the opposite side of the liquid crystal layer 103, and a polarizing plate 108 disposed on the optical compensator 107 Has been.

  The transflective liquid crystal display device 100 includes a reflective region 120 and a transmissive region 121, and the structure of the first substrate 101 in the reflective region 120 is different from the structure of the first substrate 101 in the transmissive region 121.

  In the reflective region 120, the first substrate 101 is formed on the first insulating transparent substrate 109, the passivation film 110 formed on the first insulating transparent substrate 109 on the liquid crystal layer 103 side, and the passivation film 110. A pixel electrode 111 made of aluminum, a dielectric layer 112 formed on the pixel electrode 111 and having a concavo-convex surface, and a pixel electrode 113 made of aluminum that is rugged and covers the dielectric layer 112. An alignment film 114 formed so as to cover the pixel electrode 113, an optical compensation plate 115 formed on the first insulating transparent substrate 109 on the side opposite to the liquid crystal layer 103, and an optical compensation plate 115 The polarizing plate 116 is disposed.

  On the other hand, in the transmissive region 121, the first substrate 101 is formed on the first insulating transparent substrate 109, the passivation film 110 formed on the first insulating transparent substrate 109 on the liquid crystal layer 103 side, and the passivation film 110. A pixel electrode 111 made of ITO, an alignment film 114 formed on the pixel electrode 111, an optical compensator 115 formed on the first insulating transparent substrate 109 on the opposite side of the liquid crystal layer 103, and an optical And a polarizing plate 116 disposed on the compensation plate 115.

  In the liquid crystal display device 100 according to the present embodiment, the first substrate 101 and the second substrate 102 are formed separately, and then combined in a state where the substrates face each other. For this reason, the alignment accuracy between the 1st board | substrate 101 and the 2nd board | substrate 102 may become a problem similarly to the plasma display apparatus as a display apparatus which concerns on 1st embodiment.

  As in the case of the first embodiment, for example, the linear first alignment marker 10 shown in FIG. 1 is formed in the same layer as the pixel electrode 111 of the first substrate 101, and the same as the dielectric layer 112. A line-shaped second alignment marker 11 is formed on the layer. Further, the third alignment marker 14 shown in FIG. 1 is formed in the same layer as the counter electrode 105 of the second substrate 102.

  These first to third alignment markers 10, 11, 14 are all formed in a non-display area outside the display area (reflection area 120 and transmission area 121) of each substrate 101, 102.

  In the liquid crystal display device as the display device according to the present embodiment, the linear first alignment marker 10 overlaps the center point 12 of the third alignment marker 14 and the linear second By making the alignment marker 11 overlap the center point 12 of the third alignment marker 14, that is, so that the intersection of the first alignment marker 10 and the second alignment marker 11 overlaps the center point 12. The alignment between the first substrate 101 and the second substrate 102 is performed.

  Also in the liquid crystal display device as the display device according to the present embodiment, the same effects as the plasma display device as the display device according to the first embodiment can be obtained.

  That is, both the positional deviation amount between the counter electrode 105 and the pixel electrode 111 and the positional deviation amount between the counter electrode 105 and the dielectric layer 112 are the assembly between the first substrate 101 and the second substrate 102. The positional deviation amount between the dielectric layer 112 and the pixel electrode 111 is negligible, which is equal to the deviation amount. Therefore, the alignment accuracy between the first substrate 101 and the second substrate 102 can be improved by the amount of positional deviation between the dielectric layer 112 and the pixel electrode 111.

  The present embodiment can be applied to a transmissive liquid crystal display device and a reflective liquid crystal display device in addition to the above-described transflective liquid crystal display device, and further to a lateral electric field type active matrix liquid crystal display device. Is applicable. In a horizontal electric field type active matrix liquid crystal display device, a data electrode and a common electrode are formed on a back substrate so as to extend in a first direction, and a black matrix layer is formed on the front substrate so that the black matrix layer is orthogonal to the first direction. It is formed to extend in two directions. Therefore, for example, the linear first and second alignment markers 10 and 11 are formed in the same layer as the data electrode and the common electrode, and the third alignment marker 14 is formed in the same layer as the black matrix layer.

  In a horizontal electric field type active matrix liquid crystal display device, at least a thin film transistor, a pixel electrode, a common electrode, a data electrode, and a scanning line are formed on one substrate. The pixel electrode can be formed in a zigzag shape, for example. When the pixel electrodes are formed in a zigzag shape in this way, the first linear alignment marker 10 is formed in the same layer as the data electrode, the second alignment marker 11 is formed in the same layer as the common electrode, Three alignment markers 14 are formed in the same layer as the black matrix layer on the counter substrate side. Furthermore, an angle (for example, 45 degrees) passes through the intersection of the first and second alignment markers 10 and 11 that are orthogonal to each other, and with respect to both the first and second alignment markers 10 and 11. The formed line can be formed in the same layer as the pixel electrode as a fourth alignment marker (this is described as a deformable example in the first embodiment, and M layers requiring positional accuracy are formed on the front substrate. (M is a positive integer greater than or equal to 3).

(Third embodiment)
The display device according to the third embodiment of the present invention is configured as a cold cathode field emission display. FIG. 7 is a cross-sectional view of a cold cathode field emission display device as a display device according to the present embodiment.

  The cold cathode field emission display device as a display device according to the present embodiment includes a first substrate 201 and a second substrate 202 which are arranged to face each other.

  The first substrate 201 includes a base 210, an anode 211 formed on the base 210, and a light emitting layer 212 formed on the anode 211.

  The second substrate 202 includes a conductive substrate 220, an insulating film 221 formed on the conductive substrate 220, and an emitter formed on the conductive substrate 220 in a gate opening 221 a formed in the insulating film 221. A cone 222, a first resistance film 223 formed on the insulating film 221, and a second resistance film 224 formed on the first resistance film 223 are configured. The first resistance film 223 has a larger resistance than the second resistance film 224.

  In the cold cathode field emission display according to this embodiment, the first substrate 201 and the second substrate 202 are separately formed, and then combined in a state where the substrates are opposed to each other. For this reason, the alignment accuracy between the 1st board | substrate 201 and the 2nd board | substrate 202 may become a problem similarly to the plasma display apparatus as a display apparatus which concerns on 1st embodiment.

  As in the case of the first embodiment, for example, the line-shaped first alignment marker 10 shown in FIG. 1 is formed in the same layer as the insulating film 221 of the second substrate 202, and the second resistance film 224 A line-shaped second alignment marker 11 is formed in the same layer. Further, the third alignment marker 14 shown in FIG. 1 is formed in the same layer as the light emitting layer 212 of the first substrate 201.

  In the cold cathode field emission display device as the display device according to the present embodiment, the line-shaped first alignment marker 10 overlaps the center point 12 of the third alignment marker 14, and the line-shaped By aligning the second alignment marker 11 with the center point 12 of the third alignment marker 14, that is, the intersection of the first alignment marker 10 and the second alignment marker 11 is the center point 12. The first substrate 201 and the second substrate 202 are aligned so as to overlap with each other.

  Also in the liquid crystal display device as the display device according to the present embodiment, the same effects as the plasma display device as the display device according to the first embodiment can be obtained.

  That is, both the misalignment amount between the light emitting layer 212 and the insulating film 221 and the misalignment amount between the light emitting layer 212 and the second resistance film 224 are both between the first substrate 201 and the second substrate 202. The positional deviation amount between the second resistance film 224 and the insulating film 221 can be ignored, which is equal to the assembly deviation amount. Therefore, the alignment accuracy between the first substrate 201 and the second substrate 202 can be improved by the amount of positional deviation between the second resistance film 224 and the insulating film 221.

  The display device according to the present invention has been described above using the plasma display device, the liquid crystal display device, and the cold cathode field emission display device as examples. However, the application target of the present invention is not limited to these display devices. The display device can be applied to any display device as long as it can display a predetermined image with the two substrates facing each other.

It is the schematic which shows an example of the 1st alignment marker in the display apparatus which concerns on 1st embodiment of this invention, the 2nd alignment marker, and the 3rd alignment marker. It is a perspective view which shows the formation position of the 1st alignment marker in each board | substrate, the 2nd alignment marker, and the 3rd alignment marker. It is a conceptual diagram which shows the effect of the display apparatus which concerns on 1st embodiment of this invention. In the plasma display panel display device shown in FIG. 9, a graph showing the correlation between the amount of positional deviation (unit: μm) between the barrier ribs and the black dielectric layer and the luminance of the display device (unit: cd / cm ² ). is there. 10 is a graph showing a correlation between a positional deviation amount (unit: μm) between a partition wall and a black dielectric layer and a discharge voltage (unit: V) of the display device in the plasma display panel display device shown in FIG. 9. It is sectional drawing of the liquid crystal display device as a display apparatus which concerns on 2nd embodiment of this invention. It is sectional drawing of the cold cathode field emission display as a display apparatus which concerns on 3rd embodiment of this invention. It is the schematic which shows an example of an alignment marker. It is a disassembled perspective view which shows an example of the structure of one display cell in a plasma display panel display apparatus. It is a conceptual diagram which shows the amount of position shift in the conventional plasma display apparatus. It is a top view of the conventional board | substrate which has an alignment marker. It is a conceptual diagram assuming the case where two substrates are combined. In the conventional display apparatus, it is a conceptual diagram showing the amount of position shift which arises when the 1st substrate and the 2nd substrate are combined.

Explanation of symbols

10 First alignment marker 11 Second alignment marker 12 Center point 13 Circle 14 Third alignment marker 302 Insulating substrate 303 Scan electrode 304 Common electrode 305, 306 Bus electrode 312 Dielectric layer 312a Black dielectric layer 313 Protective layer 301 Insulating substrate 307 Data electrode 314 Dielectric layer 315 Partition 311 Phosphor layer 351 Front substrate 352 Back substrate

Claims (11)

A first substrate on which at least N layers (N is a positive integer of 2 or more) are formed on a main plane;
A second substrate having at least one layer formed on the main plane,
In the display device for displaying a predetermined image by causing the main plane of the first substrate and the main plane of the second substrate to face each other,
Each of the at least N layers of the first substrate has a first alignment marker formed of lines extending in different directions,
The at least one layer of the second substrate has a second alignment marker formed of an arbitrary figure having a center point,
The display device according to claim 1, wherein the first alignment marker and the second substrate are aligned by overlapping the first alignment marker on the center point of the second alignment marker.   2. The different direction is a layer in which the first alignment marker is formed, and is a direction parallel to each of N layers constituting a component of the display device. The display device described. A first substrate having at least two layers formed on a main plane;
A second substrate having at least one layer formed on a main plane,
In the display device for displaying a predetermined image by causing the main plane of the first substrate and the main plane of the second substrate to face each other,
On one of the at least two layers of the first substrate, a first alignment marker consisting of a line extending in a first direction is formed,
A second alignment marker consisting of a line extending in a second direction perpendicular to the first direction is formed on the other of the at least two layers of the first substrate.
The at least one layer of the second substrate has a third alignment marker formed of an arbitrary figure having a center point,
Positioning between the first substrate and the second substrate is performed by superimposing the first and second alignment markers on the center point of the third alignment marker. Display device.   4. The display according to claim 3, wherein the first direction is a layer in which the first alignment marker is formed and is parallel to a layer constituting one component of the display device. apparatus.   The display device according to claim 1, wherein the arbitrary figure is a circle.   6. The display device according to claim 1, wherein the first, second, third, first, and second alignment markers are formed outside a display region.   The display device according to claim 3, wherein the display device is a plasma display device.   8. The display according to claim 7, wherein the first and second substrates are respectively a front substrate and a back substrate, and the at least two layers of the first substrate are a light shielding layer and a bus electrode layer. apparatus.   The display device according to claim 7, wherein the at least one layer of the second substrate is a partition layer.   The display device according to claim 3, wherein the display device is a liquid crystal display device. The display device according to claim 3, wherein the display device is a cold cathode field emission display device.

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