KR20140122446A - reverse prism type optical device - Google Patents

reverse prism type optical device Download PDF

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Publication number
KR20140122446A
KR20140122446A KR20130039124A KR20130039124A KR20140122446A KR 20140122446 A KR20140122446 A KR 20140122446A KR 20130039124 A KR20130039124 A KR 20130039124A KR 20130039124 A KR20130039124 A KR 20130039124A KR 20140122446 A KR20140122446 A KR 20140122446A
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KR
South Korea
Prior art keywords
prism
pattern
reverse
prism pattern
protective sheet
Prior art date
Application number
KR20130039124A
Other languages
Korean (ko)
Inventor
고재호
이정민
이동철
김영일
민지홍
Original Assignee
주식회사 엘엠에스
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Application filed by 주식회사 엘엠에스 filed Critical 주식회사 엘엠에스
Priority to KR20130039124A priority Critical patent/KR20140122446A/en
Publication of KR20140122446A publication Critical patent/KR20140122446A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention relates to a reverse prism optical device and, more specifically, to a reverse prism optical device having improved reliability and durability and minimized optical defects. The reverse prism optical device comprises: a reverse prism sheet which has a first prism pattern to introduce light and which outputs the light introduced into the first prism pattern to the other side; and a reverse prism protection sheet which is arranged on the lower part of the reverse prism sheet to prevent the first prism pattern from being damaged, thereby removing damage due to a contact between a light guide plate and the reverse prism sheet and improving optical defects.

Description

A reverse prism type optical device,

The present invention relates to an inverse prism type optical element, and more particularly, to an inverse prism type optical element capable of improving reliability and durability as well as optical defects.

In general, a liquid crystal display (LCD) requires a backlight unit that provides uniform light throughout the screen unlike a conventional CRT.

FIG. 1 is an exploded perspective view showing a conventional backlight unit, and FIG. 2 is a cross-sectional view illustrating a backlight unit having a conventional reverse prism sheet.

1, the conventional backlight unit includes a light source 1, a reflector 2 for reflecting light emitted from the light source 1, and a light guide plate 3, And reflects the light reflected by the reflective sheet 4 to improve the utilization efficiency of light. Here, the reflection plate 2 reflects the light emitted from the light source 1 toward the light guide plate 3, and is disposed on one side of the light guide plate 3.

In the backlight unit, a diffusion sheet 5 for uniformly diffusing light is disposed on the upper portion of the light guide plate 3, and prism sheets 6 and 7 for condensing scattered light are formed on the diffusion sheet 5, . Here, each of the prism sheets 6 and 7 has prism patterns 8 and 9 including a plurality of prisms projected upward.

The upper and lower prism sheets 6 and 7 are arranged so that the extending directions of the prism patterns 8 and 9 are perpendicular to each other to condense light.

However, since the conventional backlight unit as described above requires two prism sheets 6 and 7 as shown in FIG. 1, the manufacturing cost is increased and the number of processes is increased. The limit of reducing the thickness of the backlight unit have.

In order to solve the above problems, a reverse prism sheet 10 has recently been developed as shown in FIG.

The inverse prism sheet 10 is implemented in such a manner that the prism pattern 12 protrudes in a direction opposite to the conventional direction, that is, toward the light guide plate 3.

In the prism sheet 10, light incident from the light guide plate 3 is totally reflected on the inner surface of the prism 11 and emitted toward the upper side. Accordingly, there is advantageous in terms of the thickness and the fabrication end face rather than using two prism sheets.

However, there is also a problem with the inverse prism sheet 10 as described above. As the protruded prism pattern 12 faces the light guide plate 3, the pressing force of the prism pattern 12 There is a case where the vertex comes into contact with the light guide plate 3. As a result, scratches may be generated in the light guide plate 3, or apexes of the prism patterns 12 may be damaged. Such a problem has a problem in that the optical characteristics of the entire device are changed to cause defective devices, resulting in lower reliability and durability of the device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inverse prism type optical element that can improve reliability, durability, and optical defects.

According to an aspect of the present invention, there is provided an inverse prism type optical element including a first prism pattern through which light is incident, and a second prism pattern including an inverse prism And a reverse prism type protective sheet disposed under the reverse prism sheet to prevent damage to the first prism pattern.

Preferably, the reverse prism type protective sheet may include a second prism pattern having a plurality of prisms arranged on a lower surface thereof.

The second prism pattern may be formed at a lower height than the first prism pattern.

The height of the second prism pattern may be 1 to 3 탆.

The second prism pattern may be formed at a larger pitch than the first prism pattern.

Preferably, the pitch of the second prism pattern may be 50 to 170 탆.

Preferably, the second prism pattern has a smaller internal angle than the first prism pattern.

Preferably, the internal angle of the second prism pattern may be 0.5 to 7 degrees.

Preferably, the reverse prism type protective sheet further includes a second prism pattern having a plurality of prisms arranged on a lower surface thereof, and a non-planar pattern having a random cross-sectional shape on an upper surface facing the first prism pattern .

Preferably, the reverse prism type protective sheet may have a haze ranging from 1 to 35%.

Preferably, the non-planar pattern included in the inverse prism-type protective sheet may be formed as a surface having a plurality of fine protrusions.

Preferably, the non-planar pattern included in the reverse prism type protective sheet may be formed as a surface having a plurality of fine grooves.

Preferably, the non-planar pattern included in the inverse prism-type protective sheet may be formed as a surface having a plurality of convex divided regions.

The first prism pattern may be formed of a material having a first refractive index, and the second prism pattern may be formed of a material having a second refractive index different from the first refractive index.

Preferably, the first refractive index may have a value greater than the second refractive index.

The material of the first prism pattern and the material of the second prism pattern may have different intensities.

Preferably, the reverse prism sheet may be adhered to the reverse prism type protective sheet by an adhesive layer.

In the inverse prism type optical element according to the present invention, since the inverse prism type protective sheet for preventing damage is disposed between the light guide plate and the reverse prism sheet, the damage due to the contact between the light guide plate and the reverse prism sheet is eliminated, It is effective.

By disposing the reverse prism type protective sheet as in the present invention between the light guide plate and the reverse prism sheet, it is possible to solve the problem that scratches occur in the light guide plate due to assembly or pressing during use or that the vertex of the prism pattern formed on the reverse prism sheet is damaged . Therefore, reliability and durability of the entire device can be improved.

1 is an exploded perspective view showing a conventional backlight unit;
FIG. 2 is a cross-sectional view illustrating a backlight unit having a conventional reverse prism sheet; FIG.
3 is an exploded perspective view showing the configuration of a backlight unit including an inverted prism type optical element according to an embodiment of the present invention;
4 is a cross-sectional view illustrating the configuration of an inverse prism type optical element according to an embodiment of the present invention;
FIGS. 5 to 7 are plan views showing upper surface patterns of an inverted prism type protective sheet disposed between an inverse prism sheet and a light guide plate in an inverted prism type optical element according to the present invention; FIG.
8 to 9 are schematic diagrams showing a convex divided area pattern formed on an inverse prism type protective sheet;
10 is a cross-sectional view showing a configuration in which a separate adhesive layer is further included in an inverse prism type optical element; And
11 is a cross-sectional view showing a configuration in which a separate adhesive layer is further provided between the light guide plate and the reverse prism type optical element.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

In the following description, an inverse prism type optical element according to an embodiment of the present invention will be described as an example in which the present invention is applied to a backlight unit of a liquid crystal display device. However, the present invention is not limited thereto, and may be used alone or in a backlight unit applied to a device other than a liquid crystal display device, But may be applied to any device.

FIG. 3 is an exploded perspective view illustrating a configuration of a backlight unit according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating the configuration of an inverse prism type optical element according to an embodiment of the present invention.

3, the backlight unit includes a light source 1, a reflection plate 2, a light guide plate 3, and an inverted prism type optical element, wherein the inverted prism type optical element includes an inverted prism sheet 110, Type protective sheet 140 as shown in FIG.

The light source 1 is a kind of lamp, and generates light in response to the driving power source.

For example, the light source 1 may be formed of a cold cathode fluorescent lamp (CCFL) having a long and long cylindrical shape. Alternatively, the light source 1 may be formed of an external electrode fluorescent lamp (EEFL) having electrodes formed on the outer surfaces of both ends thereof. In addition, the light source 1 may include a plurality of light emitting diodes (LEDs).

The reflection plate 2 reflects the light generated from the light source 1 toward the light guide plate 3.

The light incident from the light source 1 toward the light guide plate 3 propagates while causing total internal reflection within the light guide plate 3 and the light incident on the surface of the inside of the light guide plate 3 at an incident angle smaller than the critical angle is transmitted without being totally reflected . The light emitted to the upper side of the light guide plate 3 travels toward the reverse prism sheet 110.

The light guide plate 3 may be formed of, for example, polymethyl methacrylate (PMMA) or polycarbonate (PC).

The prism sheet 110 includes a base film 130 formed of a transparent material such as polyester or the like and a first prism pattern 120. The first prism pattern 120 includes a base film 130, A UV curable resin or a thermosetting resin may be used for the lower surface of the substrate. That is, the first prism pattern 120 is formed by applying a curable resin on the lower surface of the base film 130, pressing it with a stamp having a predetermined pattern, and curing the curable resin using UV or heat It is possible.

The first prism pattern 120 included in the inverse prism sheet 110 includes a plurality of prisms protruding in the direction of the light guide plate 3.

The prisms of the first prism pattern 120 are configured to be parallel to the edge of the light guide plate 3 adjacent to the light source 1. [

It is preferable that a plurality of prisms of the first prism pattern 120 are formed parallel to each other.

The reverse prism type protective sheet 140 is disposed between the light guide plate 3 and the reverse prism sheet 110. In other words, the reverse prism type protective sheet 140 is disposed on the lower portion of the reverse prism sheet 110 while being disposed on the upper side of the light guide plate 3.

The inverse prism type protective sheet 140 transmits the light emitted from the light guide plate 3 to the inverse prism sheet 110 while preventing the first prism pattern 120 from being damaged.

The reverse prism type protective sheet 140 includes a transparent substrate 160 formed of a transparent material such as polyester and a second prism pattern 150 through which light emitted from the light guide plate 3 is incident, The second prism pattern 150 may be formed on the lower surface of the transparent substrate 160 using a UV curable resin or a thermosetting resin. In other words, the second prism pattern 150 is formed by applying a curable resin on the lower surface of the transparent substrate 160, pressing it with a stamp having a predetermined pattern, and curing the curable resin using UV or heat It is possible.

The second prism pattern 150 included in the inverse prism type protective sheet 140 includes a plurality of prisms protruding toward the light guide plate 3.

The prisms of the second prism pattern 150 are configured to be parallel to the edge of the light guide plate 3 adjacent to the light source 1. [

It is preferable that a plurality of prisms forming the second prism pattern 150 are formed parallel to each other.

Next, the first prism pattern 120 included in the inverted prism sheet 110 and the second prism pattern 150 included in the inverted prism type protective sheet 140 will be described.

4 is a cross-sectional view illustrating the configuration of an inverse prism type optical element according to an embodiment of the present invention.

The pitch P2 of the second prism patterns 150 included in the inverse prism type protective sheet 140 is relatively larger than the pitch P1 of the first prism patterns 120 included in the inverse prism sheet 110 . That is, the second prism patterns 150 are formed to have a larger pitch than the first prism patterns 120. Here, the pitch P1 of the first prism patterns 120 is a distance between vertices of two adjacent prisms in the prisms constituting the first prism pattern 120, and the pitch P2 of the second prism patterns 150 is Is the distance between the vertexes of two neighboring prisms in the prisms constituting the second prism pattern (150).

For example, the pitch P1 of the first prism patterns 120 is preferably 10 to 50 mu m, and the pitch P2 of the second prism patterns 150 is preferably 50 to 170 mu m.

The height H1 of the first prism pattern 120 included in the inverse prism sheet 110 is relatively larger than the height H2 of the second prism pattern 150 included in the inverse prism type protective sheet 140, . That is, the second prism pattern 150 is formed at a lower height than the first prism pattern 120. The height H1 of the first prism pattern 120 is a vertical distance from the horizontal plane to the vertex of the prism and the height H2 of the second prism pattern 150 is a vertical distance from the horizontal plane to the vertex of the prism. The horizontal plane may be a plane D1 or D2 including an imaginary straight line connecting the prism valleys constituting the first and second prism patterns 120 and 150.

For example, the height H1 of the first prism pattern 120 is preferably 10 to 40 mu m, and the height H2 of the second prism pattern 150 is preferably 1 to 3 mu m.

The inner angle C2 of the second prism pattern 150 included in the inverted prism type protective sheet 140 is relatively larger than the inner angle C1 of the first prism pattern 120 included in the inverted prism sheet 110 As shown in Fig. The inner angles C1 and C2 of the first prism pattern 120 and the second prism pattern 150 are set such that the sides E1 and E2 of the prism constituting the first and second prism patterns 120 and 150 are parallel to the horizontal plane Respectively. The horizontal surface may be an upper surface or a lower surface of the base film 130 included in the reverse prism sheet and may be an upper surface or a lower surface of the transparent substrate 160 included in the reverse prism type protective sheet 140. The horizontal plane may be a plane D1 or D2 including an imaginary straight line connecting the prism valleys constituting the first and second prism patterns 120 and 150.

For example, the inner angle C1 of the first prism pattern 120 is preferably 25 to 65 degrees, and the inner angle C2 of the second prismatic pattern 150 is preferably 0.5 to 7 degrees.

The first prism pattern 120 included in the inverted prism sheet 110 is formed of a material having a first refractive index and the second prism pattern 150 included in the inverted prism type protective sheet 140 has a second refractive index The branch is formed of a material. Here, the first refractive index and the second refractive index may be different from each other, and the first refractive index may be greater than the second refractive index.

For example, the material of the first prism pattern 120 may have a first refractive index of 1.45 to 1.65, and the material of the second prism pattern 150 may have a second refractive index of 1.4 to 1.6.

The material of the second prism pattern 150 included in the reverse prism type protective sheet 140 may be formed of a material different from that of the material of the first prism pattern 120 included in the reverse prism sheet 110.

For example, the material of the second prism pattern 150 included in the reverse prism type protective sheet 140 is a soft material having a smaller strength than the material of the first prism pattern 120 included in the reverse prism sheet 110 .

As another example, the material of the second prism pattern 150 included in the reverse prism type protective sheet 140 may be formed of a soft material having the same strength or a small strength as the material of the light guide plate 3.

The inverted prism type protective sheet 140 further includes a non-planar pattern having a random cross-sectional shape formed on the upper surface of the transparent substrate 160, including a second prism pattern 150 formed on a lower surface of the transparent substrate 160 can do. That is, the reverse prism type protective sheet 140 may further include a non-flat pattern formed on the upper surface facing the reverse prism sheet 110.

The inverse prism type protective sheet 140 may have a haze ranging from 1 to 35% by a non-planar pattern that may be formed on the upper surface of the transparent substrate 160. Here, the turbidity refers to the degree of fog which appears when light passes through the sample, and the sample in the present invention refers to the reverse prism type protective sheet 140. The turbidity is expressed by the ratio of Diffuse Transmittance (DT) divided by Total Transmittance (TT) and is calculated as follows.

Haze = (DT / TT) x 100 (unit,%)

Here, the diffused transmitted light (DT) is the amount of scattered light (lux) among the light transmitted through the sample, and the total transmitted light (DT) is the amount of all light transmitted through the sample. Parallel transmittance (PT), on the other hand, can be expressed as TT - DT, where PT is the amount of light transmitted without causing scattering in the transmitted light.

The inverted prism type protective sheet 140 forms a non-planar pattern on the upper surface of the transparent substrate 160 so that the vertex of the first prism pattern 120 included in the inverted prism sheet 110 and the vertex of the inverted prism type protective sheet 140 Can be reduced to reduce optical defects such as " wet-out ". Here,? -Out (Wet-Out) is a phenomenon that occurs when the two sheet surfaces are in optical contact with each other and the change in refractive index is removed when light is transmitted from one sheet to the next, And is recognized as an abnormal or defective part.

The non-planar pattern included in the inverse prism-type protective sheet 140 may be formed as a surface having a plurality of fine protrusions. The protrusion height of the fine protrusions is preferably 1 to 20 占 퐉, and the diameter of the fine protrusions is preferably 1 to 40 占 퐉.

As another example, the uneven pattern included in the inverse prism type protective sheet 140 may be formed as a surface having a plurality of fine grooves. The depth of the fine grooves is preferably 1 to 20 占 퐉, and the diameter of the fine grooves is preferably 1 to 40 占 퐉.

The fine protrusions and the fine grooves generally have a circle shape in planar projection, but may have various shapes such as an ellipse, a polygon, and the like, and shapes and sizes may be different from each other. The diameter when the planar projection shape of the fine protrusions and the fine grooves is not a circle is defined as a maximum value of the distances between two points on the edge of the planar projection shape.

As another example, the non-planar pattern included in the inverse prism-type protective sheet 140 may be formed of a wave-shaped surface or a surface having a plurality of convex divided regions. The width of the divided region is preferably 10 to 100 mu m.

The width of the divided area is defined as a maximum value of the distances between two points on the border of each divided area in a planar projection.

5 to 7 are plan views showing top surface shapes of an inverted prism type protective sheet 140 of the present invention.

5 to 7 show examples of non-planar patterns, wherein FIG. 5 shows a case where the inverted prism type protective sheet 140 has a turbidity of 7% as a non-planar pattern having a plurality of fine projections, and FIG. Lt; / RTI > shows a non-planar pattern in which a plurality of fine grooves are formed so as to have a turbidity of 10%. Figure 7 also shows a non-planar pattern with a large number of convex partitions, with a turbidity of 7%. The divided regions may be formed in various shapes as shown in the schematic diagrams of FIGS. Specifically, the shape of each divided area may be circular or elliptical, and may have other shapes such as rhombus and polygon. Also, the size and shape of such a partition are not limited. When the non-planar pattern is formed in such a divided region, the area of flatness is reduced as compared with the case having fine protrusions of FIG. 5 and the fine groove of FIG. 6, so that the contact area with the apex of the first prism pattern 120 can be further reduced. Out phenomenon can be further reduced.

Here, the turbidity may vary depending on the surface roughness and the degree of surface waviness.

Next, a case where the reverse prism sheet 110 is adhered to the reverse prism type protective sheet 140 will be described.

10 is a cross-sectional view showing a configuration in which a separate adhesive layer 170 is further included in the inverse prism type optical element.

 As illustrated, the reverse prism type optical element may include an inverted prism sheet 110, an inverted prism type protective sheet 140, and an adhesive layer 170.

The adhesive layer 170 may be included between the reverse prism sheet 110 and the reverse prism type protective sheet 140 and the reverse prism sheet 110 may be formed by the reverse prism type protection sheet 140 by the adhesive layer 170. [ And can be joined to the sheet 140.

The adhesive layer 170 may be formed on the upper surface of the transparent substrate 160.

However, when the reverse prism sheet 110 is adhered to the reverse prism type protective sheet 140, the first prism pattern 120 is formed of a material having adhesiveness without using a separate adhesive layer 170, And the apex portion of the prism pattern 120 may be adhered to the upper portion of the reverse prism type protective sheet 140. [

5 to 9 may be formed of an adhesive material without using a separate adhesive layer 170 so that the vertex of the first prism pattern 120 may be adhered to the surface of the reverse prism type protective sheet 140 It can be configured to adhere to the non-planar pattern.

Next, a case in which the reverse prism type protective sheet 140 is formed by adhering to the light guide plate 3 will be described.

11 is a cross-sectional view showing a configuration in which a separate adhesive layer 180 is further provided between the reverse prism type protective sheet 140 and the light guide plate 3.

 The adhesive layer 180 may be included between the lower portion of the reverse prism type protective sheet 140 of the inverted prism type optical element and the upper portion of the light guide plate 3, The inverse prism type protective sheet 140 of the inverse prism type optical element can be bonded to the light guide plate 3.

The adhesive layer 180 may be formed on the upper surface of the light guide plate 3.

The second prism pattern 150 of the inverted prism type protective sheet 140 using an adhesive layer 170 is formed of an adhesive material so that the inverted prism type protective sheet 140 and the light- As shown in Fig.

The case where the reverse prism sheet 110 is formed by adhering to the reverse prism type protective sheet 140 or the reverse prism type protective sheet 140 is formed by adhering to the light guide plate 3 is described above, Prism type protective sheet 140, and the light guide plate 3 may be adhered to each other by a bonding method as described above.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them. Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

1: Light source
2: Reflector
3: Light guide plate
6, 7: prism sheet
110: reverse prism sheet
120: first prism pattern
130: base film
140: Reverse prism type protective sheet
150: second prism pattern
160: transparent substrate
170, 180: adhesive layer

Claims (17)

A reverse prism sheet including a first prism pattern on which light is incident and emitting light incident on the first prism pattern toward the other side; And
A reverse prism type protective sheet disposed under the reverse prism sheet to prevent damage to the first prism pattern;
And a second prism-type optical element. The method according to claim 1,
The reverse prism type protective sheet may include:
And a second prism pattern having a plurality of prisms arranged on a lower surface thereof. 3. The method of claim 2,
Wherein the second prism pattern is formed by:
Wherein the first prism pattern is formed at a lower height than the first prism pattern. The method of claim 3,
And the height of the second prism pattern is 1 to 3 占 퐉. 3. The method of claim 2,
Wherein the second prism pattern is formed by:
Wherein the first prism pattern is formed at a larger pitch than the first prism pattern. 6. The method of claim 5,
And the pitch of the second prism pattern is 50 to 170 占 퐉. 3. The method of claim 2,
Wherein the second prism pattern is formed by:
Wherein the first prism pattern is formed to have a smaller internal angle than the first prism pattern. 8. The method of claim 7,
And an internal angle of the second prism pattern is 0.5 to 7 degrees. The method according to claim 1,
The reverse prism type protective sheet may include:
And a second prism pattern having a plurality of prisms arranged on a lower surface thereof,
And a non-planar pattern having a random cross-sectional shape on an upper surface facing the first prism pattern. 10. The method of claim 9,
Wherein the inverse prism type protective sheet has a haze ranging from 1 to 35%. 10. The method of claim 9,
Wherein the non-planar pattern included in the inverse prism-type protective sheet is formed as a surface having a plurality of fine protrusions. 10. The method of claim 9,
Wherein the non-planar pattern included in the inverse prism type protective sheet is formed of a surface having a plurality of fine grooves. 10. The method of claim 9,
Wherein the non-planar pattern included in the inverse prism-type protective sheet is formed as a surface having a plurality of convex divided areas. 3. The method of claim 2,
Wherein the first prism pattern is formed of a material having a first refractive index and the second prism pattern is formed of a material having a second refractive index different from the first refractive index. 15. The method of claim 14,
Wherein the first refractive index has a larger value than the second refractive index. 3. The method of claim 2,
Wherein the material of the first prism pattern and the material of the second prism pattern have different intensities. The method according to claim 1,
And the reverse prism sheet is bonded to the reverse prism type protective sheet by an adhesive layer.
KR20130039124A 2013-04-10 2013-04-10 reverse prism type optical device KR20140122446A (en)

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KR20130039124A KR20140122446A (en) 2013-04-10 2013-04-10 reverse prism type optical device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108562964A (en) * 2018-01-10 2018-09-21 京东方科技集团股份有限公司 Front located light source module and reflective display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108562964A (en) * 2018-01-10 2018-09-21 京东方科技集团股份有限公司 Front located light source module and reflective display

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