WO2012096303A1

WO2012096303A1 - Glass plate for display device, liquid crystal display device provided with the glass plate, method and apparatus for manufacturing glass plate for display device, and method for manufacturing liquid crystal display device

Info

Publication number: WO2012096303A1
Application number: PCT/JP2012/050371
Authority: WO
Inventors: 岩田　正和
Original assignee: 日本電気硝子株式会社
Priority date: 2011-01-14
Filing date: 2012-01-11
Publication date: 2012-07-19
Also published as: TW201232111A; JPWO2012096303A1

Abstract

Provided is a glass plate for display devices, whereby display qualities of the display devices are not easily deteriorated, irrespective of having recesses and projections on the surfaces. A glass plate (20) for display devices is a rectangular glass plate having linear recesses and projections (23) on the surfaces (20e, 20f). In the glass plate (20), the extending direction of the recesses and projections (23) is tilted with respect to one end side.

Description

GLASS PLATE FOR DISPLAY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE INCLUDING THE SAME, MANUFACTURING METHOD AND MANUFACTURING DEVICE FOR GLASS PLATE FOR DISPLAY DEVICE, AND MANUFACTURING METHOD FOR LIQUID CRYSTAL DISPLAY DEVICE

The present invention relates to a glass plate for a display device, a liquid crystal display device including the same, a manufacturing method and a manufacturing device for a glass plate for a display device, and a manufacturing method for a liquid crystal display device.

In recent years, display devices such as liquid crystal displays and plasma displays have been rapidly increasing in definition. In connection with this, the request | requirement of the high quality with respect to the glass plate used for a display apparatus is also increasing. Specifically, glass plates used in display devices are required to have higher surface dimensions with less surface irregularities and optical homogeneity. From such a viewpoint, for example, in Patent Documents 1 and 2 below, a method capable of evaluating the size of the irregularities on the surface of the glass plate is proposed.

JP-A-2-73140 JP 2008-170429 A

However, it is extremely difficult to produce a glass plate having no irregularities on the surface. Moreover, even if such a glass plate can be manufactured, there is a problem that the manufacturing cost is increased.

The present invention has been made in view of such points, and an object of the present invention is to provide a glass plate for a display device that is unlikely to deteriorate the display quality of the display device even though the surface has irregularities. It is in.

The glass plate for a display device according to the present invention is a rectangular glass plate for a display device having linear irregularities formed on the surface. In the glass plate for a display device according to the present invention, the extending direction of the unevenness is inclined with respect to one end side. For this reason, when the glass plate for a display device according to the present invention is used, the display quality of the display device is hardly deteriorated despite the presence of irregularities on the surface of the glass plate. Moreover, even if it is a glass plate which has an unevenness | corrugation, it can use suitably for a display apparatus. The direction in which the unevenness extends is usually inclined with respect to the short side.

The size of the angle formed by the direction in which the unevenness extends and the direction in which the one end extends extends is preferably in the range of 2.5 ° to 86.5 °, and is preferably in the range of 5 ° to 85 °. Is more preferable, and is more preferably within a range of 10 ° to 80 °. By using the glass plate for a display device having this configuration, it is possible to more effectively suppress deterioration in display quality of the display device.

The glass plate for a display device may have a portion having a relatively large thickness and a portion having a relatively small thickness due to unevenness. That is, the glass plate for display devices may have uneven thickness. The height of the unevenness is preferably less than 0.5 μm, and more preferably less than 0.1 μm. By using the glass plate for a display device having this configuration, it is possible to more effectively suppress deterioration in display quality of the display device. Moreover, it is preferable that the uneven | corrugated width | variety is 50 mm or less, and it is more preferable that it is 10 mm or less. In this case, the effect of the present invention appears more remarkably. Conventionally, a glass plate for a display device having a concavo-convex width of more than 10 mm is preferably used, and it has been difficult to use a glass plate for a display device having a concavo-convex width of 10 mm or less for a display device. The effect of the present invention that is inclined with respect to one end side appears more remarkably, and a glass plate for a display device having an uneven width of 10 mm or less can also be suitably used for the display device.

The glass plate for a display device according to the present invention is preferably used for a liquid crystal display device. Thereby, the deterioration of the display quality of a liquid crystal display device can be suppressed more effectively. When unevenness exists, the thickness of the liquid crystal layer changes. For this reason, the light quantity difference of the light which permeate | transmitted the liquid-crystal layer arises in the part with an unevenness | corrugation, and the part without an unevenness | corrugation. For this reason, if the height of the unevenness is too large with respect to the thickness of the liquid crystal layer, the display quality tends to be greatly reduced. Therefore, the height of the unevenness is preferably less than 0.1 μm.

The liquid crystal display device according to the present invention includes two glass plates disposed to face each other at an interval, and a liquid crystal layer disposed between the two glass plates. At least one of the two glass plates is constituted by the glass plate for a display device according to the present invention. Therefore, excellent display quality can be realized.

Each of the two glass plates is formed with a portion having a relatively large thickness and a portion having a relatively small thickness due to the unevenness, and the extending direction of the unevenness in one of the two glass plates, It is preferable that the two glass plates are arranged so that the direction in which the unevenness on the other side extends is inclined. In this case, better display quality can be realized.

Further, from the viewpoint of realizing excellent display quality, the size of the angle between the direction in which the unevenness on one side of the two glass plates extends and the direction in which the unevenness on the other side extends is within the range of 5 ° to 85 °. Preferably there is.

The liquid crystal display device according to the present invention may further include a color filter laminated on a liquid crystal layer and two glass plates. The color filter includes a plurality of pixels arranged in a matrix along the first and second directions, and each of the plurality of pixels is formed to extend in the first direction, and the second direction May include a plurality of picture elements arranged along. In that case, it is preferable that the extending direction of the unevenness is inclined with respect to the first direction. According to this configuration, it is possible to reduce the color unevenness of the displayed image.
In the liquid crystal display device according to the present invention, one of the two glass plates has unevenness parallel to one end side of the glass plate, and the other has unevenness inclined with respect to one end side of the glass plate. May be. In that case, in the other of the two glass plates, the angle between one side of the glass plate and the unevenness is tan ⁻¹ (between adjacent unevenness in the direction perpendicular to the one side of the glass plate. Or less than the average value of the distances / the length of one end of the glass plate).
In the liquid crystal display device according to the present invention, both of the two glass plates may have unevenness inclined with respect to one end side. In that case, in each of the two glass plates, the size of the angle formed between the one end side and the unevenness is {tan ⁻¹ (0.5 × the distance between adjacent unevennesses in the direction perpendicular to the one end side. Average value / length of one end side)} or less is preferable.

In the method for manufacturing a glass plate for a display device according to the present invention, after forming a band-shaped glass plate base material, the glass plate base material is cut in a direction inclined with respect to the plate width direction of the glass plate base material at a predetermined interval. By doing so, a glass plate for a display device is obtained. According to this method, the glass plate for a display device according to the present invention can be preferably manufactured.

The manufacturing apparatus of the glass plate for display apparatuses which concerns on this invention is equipped with the shaping | molding part and the cutting part. The forming part forms a band-shaped glass plate base material. The cutting part cuts the glass plate base material at a predetermined interval in a direction inclined with respect to the plate width direction of the glass plate base material. According to this manufacturing apparatus, the glass plate for display devices according to the present invention can be preferably manufactured.
The manufacturing method of the liquid crystal display device which concerns on this invention is related with the manufacturing method of the liquid crystal display device which concerns on this invention. In the method for manufacturing a liquid crystal display device according to the present invention, a first mother glass plate for constituting one of the two glass plates and a second mother glass plate for constituting the other of the two glass plates. Are provided so as to face each other with a liquid crystal layer interposed therebetween, whereby a mother laminate is manufactured. A plurality of liquid crystal display devices are obtained by dividing the mother laminate into a plurality.

According to the present invention, it is possible to provide a glass plate for a display device that is unlikely to deteriorate the display quality of the display device despite the presence of irregularities on the surface.

FIG. 1 is a schematic plan view of a glass plate in one embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 3 is a schematic plan view for explaining the display quality when the unevenness extends along the y direction. FIG. 4 is a schematic plan view for explaining the display quality when the unevenness extends along the direction inclined in the y direction. FIG. 5 is a schematic plan view of a glass plate used in the reference example in which the direction in which the unevenness extends is parallel to the short side of the glass plate. FIG. 6 is a schematic plan view for explaining black lines generated when a liquid crystal layer is sandwiched between two glass plates shown in FIG. FIG. 7 is a schematic plan view for explaining a case where the liquid crystal layer is sandwiched between the two

glass plates

20A and 20B extending in the direction in which the unevenness is inclined with respect to the short side of the glass plate. FIG. 8 is a schematic plan view for explaining black spots generated in the case shown in FIG. FIG. 9 is a schematic plan view for explaining a case in which a liquid crystal layer is sandwiched between a glass plate whose unevenness is parallel to the long side and a glass plate whose unevenness is parallel to the short side. FIG. 10 is a schematic plan view for explaining black spots generated in the case shown in FIG. FIG. 11 illustrates a case where the liquid crystal layer is sandwiched between a glass plate extending in a direction in which the unevenness is inclined with respect to the edge of the glass plate and a glass plate in which the unevenness extends in a direction parallel to the edge of the glass plate. It is a typical top view for doing. FIG. 12 is a graph showing the relationship between the inclination angle of the unevenness and the length of the black spot. FIG. 13 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention. FIG. 14 is a schematic plan view of a part of a color filter according to an embodiment of the present invention. FIG. 15 is a schematic diagram of a glass plate manufacturing apparatus according to an embodiment of the present invention. FIG. 16 is a schematic plan view of a glass plate base material in one embodiment of the present invention. FIG. 17 is a schematic plan view of a glass plate base material in a modified example. FIG. 18 is a schematic diagram for explaining a reference angle when the glass plate embodying the present invention is on one side. 19 (a) and 19 (b) are schematic diagrams for explaining a reference angle when two glass plates each embodying the present invention are combined to face each other. FIG. 20 is a schematic diagram for explaining a method of measuring the inclination angle of the unevenness. FIG. 21 is a schematic plan view for explaining the manufacturing method of the liquid crystal display device. FIG. 22 is a schematic plan view for explaining a method of manufacturing the liquid crystal display device in the reference example.

Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.

(Configuration of glass plate 20)
FIG. 1 is a schematic plan view of a glass plate in the present embodiment. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 3 is a schematic plan view for explaining the display quality when the unevenness extends along the y direction. FIG. 4 is a schematic plan view for explaining the display quality when the unevenness extends along the direction inclined in the y direction.

First, the glass plate 20 according to the present embodiment will be described with reference to FIGS. 1 and 2. The glass plate 20 is a transparent glass plate. Here, in the present invention, “transparent” means that the transmittance in the visible wavelength region (400 nm to 700 nm) is 90% or more. The glass plate includes a crystallized glass plate made of crystallized glass.

As shown in FIG. 1, the glass plate 20 has a rectangular shape. The glass plate 20 has first and second

long sides

20a and 20b facing each other, and first and second

short sides

20c and 20d facing each other. The first and second

long sides

20a and 20b extend along the x direction. The first and second

short sides

20c and 20d extend along the y direction.

In the present invention, the “rectangle” includes a rectangle in which at least one of the four corners is chamfered or R-chamfered.

As shown in FIG. 1, a plurality of linear irregularities 23 are formed on each of the

main surfaces

20 e and 20 f of the glass plate 20. The unevenness 23 is inclined with respect to both the first and second

long sides

20a and 20b and the first and second

short sides

20c and 20d. Specifically, in this embodiment, the size of the angle formed by the direction in which the unevenness 23 extends and the first and second

long sides

20a and 20b and the first and second

short sides

20c and 20d is 2 It is within the range of ° to 88 °.

In the first embodiment, the height H of the unevenness 23 (the distance along the thickness direction between the adjacent bottom and top) H is preferably 0.5 μm or less, and is 0.1 μm or less. Is more preferable. The width of the unevenness 23 (distance between adjacent tops≈distance between adjacent recesses) W is preferably 50 mm or less, and more preferably 10 mm or less.

In the main surface 20e and the main surface 20f, the tops of the irregularities 23 are located at the same position. For this reason, the part in which the top part of the unevenness | corrugation 23 is located among the glass plates 20 is relatively thick, and the part in which the bottom part of the unevenness | corrugation 23 is located is relatively thin.

Note that the unevenness 23 is generated when the glass melt is flowed into a plane in a predetermined direction by performing molding such as overflow molding or float molding. The unevenness 23 is formed in a plurality of lines along the longitudinal direction of the belt-shaped glass plate base material. In general, in order to increase the utilization efficiency of the glass plate base material, the glass plate base material is cut along the lateral direction to produce a rectangular glass plate. For this reason, the unevenness | corrugation of the surface is normally extended in parallel with the edge side of a glass plate.

The glass plate 20 of the present embodiment is used for a display device such as a liquid crystal display device or a plasma display device. For example, in a liquid crystal display device, a plurality of pixels including an R picture element, a G picture element, and a B picture element are stacked on a color filter arranged in a matrix. Usually, the plurality of pixels are arranged in a matrix along the direction in which the short sides of the color filter extend and the direction in which the long sides extend. The plurality of picture elements included in the pixel are arranged along the direction in which the short side or the long side of the color filter extends.

By the way, in a glass plate having unevenness on the surface, uneven optical characteristics may occur due to the unevenness. Specifically, for example, a black line may be generated due to a lens effect or the like due to linear unevenness. In particular, when the width of the unevenness 23 is as narrow as 10 mm or less, black lines are likely to occur. Therefore, for example, when a glass plate having irregularities extending in parallel with the end sides is used, a black line 30 extending along the y direction may be formed as shown in FIG. If the black line 30 is a direction in which the short side or the long side of the glass plate extends and extends along the y direction, which is the direction in which the picture element extends, among the R picture element, the G picture element, and the B picture element There are cases where only the line of a specific picture element overlaps with the black line 30 and the lines of other picture elements do not overlap with the black line 30. Specifically, in the case shown in FIG. 3, the line of the G picture element and the line of the B picture element overlap with the black line 30, and the line of the R picture element does not overlap with the black line 30. For this reason, pixels having a reddish color tone different from the color tone to be displayed are continuously located along the y direction. Therefore, a reddish streak is observed in the vicinity of the black line 30. Accordingly, the display quality is deteriorated.

Also, for example, when the width of the unevenness is wide, the entire line of pixels along the y direction may be covered by the black line 30 formed by the unevenness. In such a case, a relatively high brightness portion and a relatively low brightness portion are arranged along the x direction. For this reason, luminance unevenness occurs, and the display quality deteriorates.

In contrast, in the present embodiment, the unevenness 23 extends in a direction inclined with respect to the edge of the glass plate 20. For this reason, as shown in FIG. 4, the black line 30 generated due to the unevenness 23 also extends in a direction inclined with respect to the end side of the glass plate 20. Therefore, the line along the y direction of a certain color picture element is not covered by the black line 30. That is, it is difficult for pixels of a specific color tone different from the color tone to be displayed to be continuously located. Therefore, uneven color and uneven brightness are not noticeable. As a result, excellent display quality can be obtained.

As a result of actually producing the liquid crystal display device 1 using the glass plate 20 of the present embodiment and displaying white on the entire surface and observing it, the color unevenness and brightness are higher than when the unevenness is parallel to the edge of the glass plate. It was confirmed that unevenness was improved.

From the viewpoint of realizing superior display quality, the size of the angle formed by the extending direction of the unevenness 23 and the extending direction of the edge of the glass plate 20 is in the range of 2.5 ° to 86.5 °. It is preferably within the range of 5 ° to 85 °, more preferably within the range of 10 ° to 80 °. In this case, it is because the pixel of the specific color tone different from the color tone to be displayed is more effectively suppressed from being continuously located. If the size of the angle formed by the direction in which the projections and depressions 23 extend and the direction in which the edge of the glass plate 20 extends is less than 5 ° or more than 85 °, a picture element of the same color is covered continuously for one pixel or more. There is a risk that.

Further, from the viewpoint of realizing superior display quality, the height H of the unevenness 23 is preferably 0.1 μm or less, and more preferably 0.05 μm or less. Moreover, it is preferable that the width | variety W of the unevenness | corrugation 23 is 10 mm or less.

Also, as will be described in detail below, by using the glass plate 20 of the present embodiment, it is possible to more effectively suppress the generation of black lines and bright lines resulting from the difference in thickness of the liquid crystal layer.

For example, when the liquid crystal layer is sandwiched between two glass plates 120 in which the extending direction of the unevenness 123 shown in FIG. 5 is parallel to the short side of the glass plate, the linear shape of the unevenness 123 of the two glass plates 120 is obtained. The linear thick part produced by the convex part is completely overlapped. For this reason, many linear parts with small thickness of a liquid crystal layer will arise. Therefore, as shown in FIG. 6, for example, a large number of black lines (in some cases, bright lines) 130 are generated.

FIG. 7 is a schematic plan view when the liquid crystal layer is sandwiched between two glass plates 20. In FIG. 7, one of the two glass plates 20 is represented by reference numeral 20A, and the other is represented by reference numeral 20B. The unevenness 23 of the glass plate 20A is represented by reference numeral 23A, and the unevenness 23 of the glass plate 20B is represented by reference numeral 23B.

In the example shown in FIG. 7, the glass plate 20 A and the glass plate 20 B are arranged so that the irregularities 23 A and 23 B are inclined with respect to each other. For this reason, the thick part produced by the unevenness 23A of the glass plate 20A and the thick part produced by the unevenness 23B of the glass plate 20B are difficult to overlap. In addition, the overlapping portion between the thick portions is not linear, but is dotted. Therefore, as shown in FIG. 8, only a small number of black spots 30a are generated.

Thus, by using the glass plate 20 in which the extending direction of the unevenness 23 is inclined with respect to the edge of the glass plate, the generation of black lines can be effectively suppressed.

From the viewpoint of suppressing the generation of black lines, as shown in FIG. 9, a liquid crystal layer is formed using a glass plate 220A in which the unevenness 223A is parallel to the long side and a glass plate 220B in which the unevenness 223B is parallel to the short side. It is also possible to pinch.

However, in this case, a large number of intersections between the thick part caused by the unevenness 223A and the thick part caused by the unevenness 223B occur. For this reason, as shown in FIG. 10, many black spots 230a will be produced.

On the other hand, as in this embodiment, when at least one of the two glass plates 20 holding the liquid crystal layer is extended so that the unevenness 23 is inclined with respect to the end side, black spots are generated. The quantity of 30a can be reduced. Therefore, the display quality of the liquid crystal display device can be further improved.

In the example shown in FIGS. 7 and 8, both of the two glass plates 20 sandwiching the liquid crystal layer extend in the direction in which the unevenness 23 is inclined with respect to the edge of the glass plate 20. Explained. However, the present invention is not limited to this. For example, as shown in FIG. 11, the glass plate 20 A extending in a direction in which the unevenness 23 A is inclined with respect to the edge of the glass plate, and the glass plate 120 in which the unevenness 123 extends in a direction parallel to the edge of the glass plate, May hold the liquid crystal layer. Even in this case, generation of black lines can be prevented and the number of generated black spots can be reduced as in the example shown in FIGS.

From the viewpoint of reducing the number of generated black spots, it is preferable that the angle formed by the direction in which the unevenness of one glass plate 20 extends and the direction in which the unevenness of the other glass plate 20 extend is small. This is because the thick portions of the respective glass plates 20 are difficult to overlap. However, if the angle between the direction in which the unevenness of one glass plate 20 extends and the direction in which the unevenness of the other glass plate 20 extends is too small, the length of each black spot tends to be long. For example, when the width of the thick part is 1 mm, as shown in FIG. 12, when the intersection angle of the unevenness is less than 5 °, the black spot is abruptly increased.

Therefore, the angle formed by the extending direction of one of the two glass plates sandwiching the liquid crystal layer and the extending direction of the other unevenness is preferably 5 ° to 85 °. More preferably, the angle is 20 ° to 70 °. Therefore, when one glass plate is assumed to be parallel to the edge side and the other glass plate is inclined to the edge side, The extending direction is preferably 5 ° to 85 °, more preferably 10 ° to 80 °, and still more preferably 20 ° to 70 ° with respect to the edge of the glass plate. On the other hand, in the case where both the glass plates are inclined in the direction in which the unevenness extends with respect to the end side, the extending direction of the unevenness is 2.5 ° to 86.5 ° with respect to the end side of the glass plate. It is preferably 5 ° to 85 °, more preferably 10 ° to 80 °.

When one glass plate of the two glass plates sandwiching the liquid crystal layer is a glass plate whose unevenness is parallel to one end side, the other glass plate extends in the direction in which the unevenness of the other glass plate extends. The angle formed with the direction in which one end side of the film extends is θave. Or less, more preferably θmin or less.

here,
θave. = Tan ⁻¹ (dave./h) (1)
θmin = tan ⁻¹ (dmin / h) (2)
h: length of one end side of the glass plate. : Average value dmin between adjacent irregularities in the direction in which the other end of the glass plate extends dmin: Minimum distance between adjacent irregularities in the direction in which the other end of the glass plate extends.

Specifically, as shown in FIG. = (D1 + d2 + d3 + d4) / 4, and dmin = d2.
The angle formed by the direction in which the unevenness of the other glass plate extends and the direction in which one end of the other glass plate extends is θave. By setting it as the following, the number of the unevenness | corrugation which cross | intersects the unevenness | corrugation of one glass plate over multiple times among the unevenness | corrugations of the other glass plate can be decreased. Further, by setting the angle formed between the extending direction of the unevenness of the other glass plate and the extending direction of one end of the other glass plate to θmin or less, the unevenness can be prevented from intersecting a plurality of times.

When h is 2160 mm with a glass plate size (2460 × 2160), d is 500 mm, θ is 13 °, d is 800 mm, θ is 20 °, d is 1000 mm, and θ is 25 °.

For the same reason, both glass plates of the two glass plates sandwiching the liquid crystal layer have an uneven surface inclined with respect to one side as shown in FIG. When the glass plate is in a mirror image relationship, as shown in FIG. 19 (b), the angle formed by the extending direction of the unevenness and the extending direction of one end of the other glass plate is θave obtained by the equation (3). . The following is preferable, and it is more preferable that it is θmin or less obtained by the equation (4).
θave. = Tan ⁻¹ (0.5 × dave. / H) (3)
θmin = tan ⁻¹ (0.5 × dmin / h) (4)

In addition, dave. When obtaining d and dmin, it is preferable to process using data of a plurality of glass plates.
Further, the size of the angle formed by one end side of the glass plate and the direction in which the unevenness extends can be measured by applying the method described in JP-A-2003-42738. Specifically, as shown in FIG. 20, the glass plate 52 is inclined (α) with respect to the optical axis of the irradiation light 51 from the light source 50. In this state, light 52 is irradiated from the light source 50 to the glass plate 52, and the glass plate is projected onto the projection surface 53. When the glass plate 52 is rotated around the rotation axis 54 extending in the normal direction of the glass plate 52, the shade of the unevenness is projected at a certain rotation angle. By measuring the angle formed by the shade of the unevenness and the shade of the one end side at that time, the size of the angle formed by the one end side of the glass plate and the extending direction of the unevenness can be measured.

(Configuration of the liquid crystal display device 1)
Next, an example of a liquid crystal display device using the glass plate 20 will be described.

FIG. 13 is a schematic cross-sectional view of the liquid crystal display device according to the present embodiment. As shown in FIG. 13, the liquid crystal display device 1 includes a planar light emitting device 10 and a liquid crystal display 11.

The planar light emitting device 10 is a device for supplying planar light to the liquid crystal display 11. The planar light emitting device 10 is a so-called direct type planar light emitting device having a plurality of light sources arranged in a plane and a diffusion member such as a diffusion plate or a prism sheet that diffuses light from the plurality of light sources. There may be. The planar light emitting device 10 may be a so-called edge light type planar light emitting device having a light guide plate and one or more light sources that emit light to the side surface of the light guide plate.

In addition, since the liquid crystal display device 1 of this embodiment is a self-luminous type liquid crystal display device, the planar light emitting device 10 is provided. However, when the liquid crystal display device is a so-called reflection type using reflected light, the planar light emitting device 10 is not necessarily an essential component.

The liquid crystal display 11 is arranged so that planar light from the planar light emitting device 10 enters. The liquid crystal display 11 includes the first polarizing plate 12, the glass plate 20, the first electrode 14, the first alignment film 15, the liquid crystal layer 16, and the first light emitting device 10 from the planar light emitting device 10 side. The second alignment film 17, the second electrode 18, the color filter 19, the glass plate 20, and the second polarizing plate 21 are stacked in this order. In other words, the liquid crystal display 11 includes two glass plates 20.

Each of the first and second

polarizing plates

12 and 21 has a property of transmitting light of a specific polarization direction, but substantially not transmitting light of a polarization direction perpendicular to the specific polarization direction. It is. In general, the first and second

polarizing plates

12 and 21 are arranged so that the polarization directions of the transmitted light are orthogonal to each other. The first polarizing plate 12 is provided on the main surface of one glass plate 20 on the planar light emitting device 10 side. On the other hand, the second polarizing plate 21 is provided on the main surface of the other glass plate 20 on the light emitting surface side.

The first or

second electrode

14 or 18 is provided on the main surface of the glass plate 20 opposite to the

polarizing plate

12 or 21. These first and

second electrodes

14 and 18 are electrodes for applying a voltage to the liquid crystal layer 16.

Alignment films

15 and 17 are provided on the

electrodes

14 and 18. The

alignment films

15 and 17 are layers having a function of aligning liquid crystal molecules in the liquid crystal layer 16 in a predetermined direction. Since these

alignment films

15 and 17 are provided, the liquid crystal molecules are aligned in a predetermined direction by the function of the

alignment films

15 and 17 in a state where no voltage is applied to the liquid crystal layer 16 by the

electrodes

14 and 18. ing. When a voltage is applied to the liquid crystal layer 16 by the

electrodes

14 and 18, the orientation of the liquid crystal molecules changes. As a result, the polarization characteristics of the liquid crystal molecules in the liquid crystal layer 16 change. As a result, the amount of light transmitted through the liquid crystal display 11 changes. In the liquid crystal display device 1, image display is performed using this change in light transmission.

In the liquid crystal display device 1, a color filter 19 is disposed between the glass plate 20 and the second electrode 18 in order to enable display of a color image.

FIG. 14 shows a plan view of a part of the color filter 19. As shown in FIG. 14, the color filter 19 includes a plurality of pixels 22 arranged in a matrix along the x and y directions orthogonal to each other. That is, the plurality of pixels 22 are arranged in a matrix along the direction in which the short sides of the color filter 19 extend and the direction in which the long sides extend.

Each of the plurality of pixels 22 includes a plurality of picture elements. Specifically, in the present embodiment, each pixel 22 includes a red (R) picture element 22R, a green (G) picture element 22G, and a blue (B) picture element 22B. . Each of the

picture elements

22R, 22G, and 22B is formed in a rectangular shape that extends in the y direction (the direction in which the short side of the color filter 19 extends). The

picture elements

22R, 22G, and 22B are arranged along the x direction (the direction in which the long side of the color filter 19 extends). In each of the plurality of pixels 22, the

picture elements

22R, 22G, and 22B are arranged in the x direction in the same order. For this reason, each of the

picture elements

22R, 22G, and 22B is arranged along the y direction. In other words, picture elements of the same color are continuously arranged along the y direction.

In the present invention, each of the plurality of pixels does not necessarily need to be composed of three picture elements arranged in a predetermined direction. For example, the pixel may be composed of one picture element, or may be composed of two picture elements or four or more picture elements. The picture element may be of a color other than red (R), green (G), or blue (B). Moreover, it is not always necessary that all the picture elements of the plurality of picture elements are arranged along one direction.

As mentioned above, although the glass plate 20 which concerns on this invention demonstrated the form used for a liquid crystal display device, the use of the glass plate 20 is not limited to a liquid crystal display device. The glass plate 20 can be used for other flat panel displays such as a self-luminous display such as a plasma display and an organic EL display.

(Manufacturing method of the glass plate 20)
Next, an example of the manufacturing method of the glass plate 20 and a manufacturing apparatus used therefor will be described.

FIG. 15 is a schematic diagram of a glass plate manufacturing apparatus 40 in the present embodiment. First, the configuration of the manufacturing apparatus 40 will be described with reference to FIG. The manufacturing apparatus 40 includes a forming part 41 and a cutting part 45.

The forming part 41 is a part for forming the strip-shaped glass plate base material 44 by allowing the molten glass melt to flow out in a plate shape along the y direction. The molding part 41 includes a melting part 42 and a molding member 43. The melting part 42 is a part that is clarified and homogenized after a glass raw material such as batch or cullet is melted to prepare a glass melt. Usually, the melting part 42 has a melting part for melting the glass raw material, a clarification part for clarifying the glass melt, and a homogenization part for homogenizing the glass melt.

The forming member 43 is a member that forms the glass plate base material 44 by causing the glass melt supplied from the melting portion 42 to flow out in a planar shape in the y direction (in this embodiment, the vertical direction). By this forming member 43, the glass plate base material 44 is formed in a strip shape extending along the y direction.

The cutting part 45 cuts the glass plate base material 44 in a direction inclined with respect to the y direction at intervals determined in the y direction. The cutting unit 45 includes a cutter 46 and a slider 47 that moves the cutter 46 linearly in a predetermined direction.

The slider 47 can move the cutter 46 in an arbitrary direction at an arbitrary speed. For example, when the glass plate base material 44 is to be cut at a speed v ₀ in a direction inclined by α (°) with respect to the x direction, the traveling speed of the glass plate base material 44 along the y direction is represented by v ₁ . Then, the slider 47 moves the cutter 46 in a direction inclined by β = tan ⁻¹ ((v ₁ −v ₀ sin α) / (v ₀ cos α)) (°) with respect to the x direction at the speed v ₂ . .

The cutter moving speed v ₂ can be expressed by v ₂ = v ₀ (cos α / cos β).

Next, the manufacturing method of the glass plate 20 using the manufacturing apparatus 40 is demonstrated.

First, a glass raw material is put into the melting part 42 and melted to obtain a glass melt. The glass melt is caused to flow out along the y direction by the forming member 43, thereby forming a band-shaped glass plate base material 44 extending in the y direction.

Next, the glass plate base material 44 is cut at a predetermined interval in the y direction in a direction inclined with respect to the y direction as shown in FIG. Thereby, the parallelogram-shaped glass plate piece 44a is obtained. Next, the rectangular glass plate 20 is obtained by cutting off the acute corner portion of the glass plate piece 44a.

By using the above manufacturing apparatus and manufacturing method, the glass plate 20 can be preferably manufactured.

For example, as shown in FIG. 17, the glass plate base material 44 may be cut along the x direction to obtain a rectangular glass plate piece 44a, and the glass plate 20 may be cut out from the glass plate piece 44a. However, in this case, the number of the glass plates 20 obtained from the glass plate base material 44 is reduced, and an inclination angle of 45 ° requires about twice the base material area, and 15 ° requires about 1.5 times the area. Therefore, 15 ° or less is desirable from the viewpoint of production. For this reason, it is preferable to form the glass plate 20 from the glass plate piece 44a after once forming the parallelogram type glass plate piece 44a as in the above embodiment.

When the liquid crystal display device 1 is assembled, the glass plate 20 in which the extending direction of the unevenness 23 is inclined with respect to the one end side may be used, or larger than the liquid crystal layer 16 and the extending direction of the unevenness 23 is the one end side. Assembling the laminate by inclining the glass plate 20 parallel to the surface, and then cutting the portion of the glass plate 20 protruding from the liquid crystal layer 16 in a direction inclined with respect to the direction in which the unevenness 23 extends. Thus, the extending direction of the unevenness 23 and one end side may be inclined.

(Manufacturing method of liquid crystal display device)
Next, an example of a method for manufacturing a liquid crystal display device will be described. Specifically, here, a method for manufacturing a small-sized liquid crystal display device for a portable terminal or a mobile terminal will be described.

A first mother glass plate for forming a glass plate 20 on which a first polarizing plate 12, a first electrode 14 and a first alignment film 15 are formed, a second polarizing plate 21, A plurality of liquid crystal display devices 1 are constructed by laminating a second mother glass plate for constituting the glass plate 20 on which the two electrodes 18 and the second alignment film 17 are formed with a liquid crystal layer interposed therebetween. A mother laminate 60 (see FIG. 21) is prepared. Next, a plurality of liquid crystal display devices 1 can be completed by dividing the mother laminate 60 along the cut lines CL1 and CL2.

For example, when both the first mother glass plate and the second mother glass plate have unevenness parallel to one side, if the unevenness of both mother glass plates overlap, as shown in FIG. There is a possibility that all of the plurality of liquid crystal display devices arranged along the extending direction of the unevenness will be defective.

On the other hand, when at least one of the first mother glass plate and the second mother glass plate is a glass plate extending in a direction in which the unevenness is inclined with respect to one end side, as shown in FIG. Since black spots or bright spots occur only at the intersections, the number of defective liquid crystal display devices can be reduced. Therefore, a liquid crystal display device can be manufactured with a high yield rate.

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device 10 ... Planar light-emitting device 11 ... Liquid crystal display 12 ... 1st polarizing plate 13 ...

Glass plate

13a, 20a, 13b, 20b ...

Long side

13c, 20c, 13d, 20d ...

Short side

13e, 20e , 13f, 20f ... main surface 14 ... first electrode 15 ... first alignment film 16 ... liquid crystal layer 17 ... second alignment film 18 ... second electrode 19 ... color filter 20 ... glass plate 21 ... second Polarizing plate 22 ... Pixel 22B ... B picture element 22G ... G picture element 22R ... R picture element 23 ... Unevenness 30 ... Black line 40 ... Manufacturing apparatus 41 ... Molding part 42 ... Melting part 43 ... Molding member 44 ... Glass plate base material 44a ... Glass plate piece 45 ... Cutting part 46 ... Cutter 47 ... Slider 50 ... Light source 52 ... Light 53 ... Projection surface 60 ... Mother laminate

Claims

It is a rectangular glass plate for a display device in which linear irregularities are formed on the surface,
A glass plate for a display device, wherein the extending direction of the unevenness is inclined with respect to one end side.
2. The glass plate for a display device according to claim 1, wherein the angle formed by the extending direction of the unevenness and the extending direction of the one end side is in a range of 2.5 ° to 86.5 °.
The glass plate for a display device according to claim 1 or 2, wherein a portion having a relatively large thickness and a portion having a relatively small thickness are formed by the unevenness.
The glass plate for a display device according to any one of claims 1 to 3, wherein a height of the unevenness is less than 0.5 µm, and a width of the unevenness is 50 mm or less.
The glass plate for a display device according to claim 4, wherein the height of the unevenness is less than 0.1 μm, and the width of the unevenness is 10 mm or less.
The glass plate for a display device according to any one of claims 1 to 5, which is used for a liquid crystal display device.
Two glass plates arranged to face each other at an interval, and a liquid crystal layer arranged between the two glass plates,
A liquid crystal display device, wherein at least one of the two glass plates comprises the glass plate for a display device according to any one of claims 1 to 6.
Each of the two glass plates is formed with a portion having a relatively large thickness and a portion having a relatively small thickness due to unevenness,
The liquid crystal display according to claim 7, wherein the two glass plates are arranged so that a direction in which the unevenness extends in one of the two glass plates and a direction in which the unevenness extends in the other are inclined. apparatus.
The liquid crystal according to claim 8, wherein the angle formed by the extending direction of the unevenness in one of the two glass plates and the extending direction of the unevenness in the other is in the range of 5 ° to 85 °. Display device.
A color filter laminated on the liquid crystal layer and the two glass plates;
The color filter includes a plurality of pixels arranged in a matrix along the first and second directions,
Each of the plurality of pixels is formed to extend in the first direction, and includes a plurality of picture elements arranged along the second direction,
The liquid crystal display device according to any one of claims 7 to 9, wherein a direction in which the unevenness extends is inclined with respect to the first direction.
One of the two glass plates has unevenness parallel to one end side of the glass plate, and the other has unevenness inclined with respect to one end side of the glass plate,
In the other of the two glass plates, the angle between one side of the glass plate and the unevenness is tan −1 (distance between adjacent unevenness in the direction perpendicular to the one side of the glass plate. The liquid crystal display device according to any one of claims 7 to 10, wherein the average value is equal to or less than an average value of one end side of the glass plate.
Both of the two glass plates have unevenness inclined with respect to one end side,
In each of the two glass plates, the size of the angle formed by one end side and the unevenness is {tan −1 (0.5 × average value of distances between adjacent unevennesses in the direction perpendicular to one end side. The liquid crystal display device according to any one of Claims 7 to 10, wherein
A method for producing a glass plate for a display device according to any one of claims 1 to 6,
Forming a band-shaped glass plate base material;
And a step of cutting the glass plate base material in a direction inclined with respect to the plate width direction of the glass plate base material at a predetermined interval.
A glass plate manufacturing apparatus for a display device according to any one of claims 1 to 6,
A molding part for molding a belt-shaped glass plate base material;
An apparatus for manufacturing a glass plate for a display device, comprising: a cutting unit that cuts the glass plate base material in a direction inclined with respect to a plate width direction of the glass plate base material at a predetermined interval.
A method for manufacturing a liquid crystal display device according to any one of claims 7 to 12,
A first mother glass plate for constituting one of the two glass plates and a second mother glass plate for constituting the other of the two glass plates are opposed to each other through the liquid crystal layer. Providing the mother laminated body by providing the
A method for manufacturing a liquid crystal display device, wherein a plurality of liquid crystal display devices are obtained by dividing the mother laminate into a plurality of pieces.