KR20160083609A - Light control film and display apparatus comprising the same - Google Patents

Abstract

The present invention provides a light control film capable of narrowing a viewing angle of a display apparatus, and a display apparatus having the same. According to the present invention, the light control film comprises a plurality of viewing angle control patterns provided in a lower surface of a base film. Each of the viewing angle control patterns can be provided in parallel with at least one lengthwise direction from first and second lengthwise directions of the base film.

Description

TECHNICAL FIELD [0001] The present invention relates to a light control film and a display device including the same,

The present invention relates to a light control film for a display device, and more particularly, to a light control film capable of narrowing a viewing angle of a display device and a display device including the same.

2. Description of the Related Art Generally, a display device includes a mobile communication terminal, an electronic notebook, an electronic book, a portable multimedia player (PMP), a navigation device, an UMPC (Ultra Mobile PC), a mobile phone, a smart phone, a tablet PC, phone, and the like, as well as display screens of various products such as televisions, notebooks, monitors, ATMs of banks, and the like.

The display device plays a role of displaying information desired by the user as an image, and generally has a wide viewing angle so that the user can view images at various angles. However, when the viewing angle is wide for each individual product to which the display device is applied, the product characteristics may be adversely affected, and in some cases, the user may be required to have a narrow viewing angle.

As an example, in a case of a bank ATM, it is preferable that a viewing angle of a display device is narrow since a user is required to prevent personal information from being viewed by other persons when the user inputs personal information.

As another example, in the case of navigation of a vehicle, if the viewing angle of the display device is wide, the image displayed on the display device may disturb the driver's concentration and disturb the operation. Further, It may be reflected from the front window of the vehicle and adversely affect the safety of the driver.

As another example, in the case of a computer or a portable electronic device, if the user does not want to expose the privacy of the individual, the wide viewing angle of the display device is contrary to the demand of the user.

As described above, the display device is generally manufactured to have a wide viewing angle, but it is required that the viewing angle be narrowed according to the product to which the display device is applied.

Therefore, it is necessary to manufacture the display device by adjusting the viewing angle to suit the product to which the display device is applied. However, when the display device is separately manufactured according to the product, productivity is decreased.

As a result, there is a demand for a method for narrowing the viewing angle of a display device manufactured to have a wide viewing angle.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object thereof is to provide a light control film capable of narrowing the viewing angle of a display device and a display device including the same.

According to an aspect of the present invention, there is provided a light control film comprising a plurality of viewing angle control patterns provided on a lower surface of a base film, wherein each of the plurality of viewing angle control patterns includes at least one of first and second longitudinal directions And may be provided in parallel with one longitudinal direction.

Further, the light control film according to the present invention may further include a plurality of light absorption patterns provided on the upper surface of the base film so as to overlap with the plurality of viewing angle control patterns.

According to an aspect of the present invention, there is provided a display device including a light control film disposed on a display panel and having a plurality of viewing angle control patterns.

According to an aspect of the present invention, there is provided a display device including a light control film having a plurality of viewing angle control patterns and a plurality of light absorption patterns overlapping with a base film interposed therebetween, .

According to an aspect of the present invention, a light viewing angle of a display device can be narrowed or controlled by blocking light incident at an angle of more than a specific angle through a light control film.

In addition to the effects of the present invention mentioned above, other features and advantages of the present invention will be described below, or may be apparent to those skilled in the art from the description and the description.

1 is a cross-sectional view for explaining a light control film according to a first example of the present invention.
2A to 2C are plan views illustrating various examples of the viewing angle control pattern shown in FIG.
3 is a cross-sectional view for explaining a light control film according to a second example of the present invention.
4 is a plan view for explaining the touch electrode layer shown in FIG.
5 is a cross-sectional view for explaining a light control film according to a third example of the present invention.
6 is a cross-sectional view for explaining a modified example of the light absorption pattern shown in Fig.
FIG. 7 is a simulation graph of an outgoing light distribution by angle incident on the light control film according to the third example of the present invention. FIG.
8 is a view for explaining a display device according to the first example of the present invention.
9 is a view for explaining a display device according to a second example of the present invention.
10 is a view for explaining a modified example of the light control film shown in Fig.
11 is a view for explaining another modification of the light control film shown in Fig.
12 is a graph showing the distribution of vertical angle of view of the display device according to the related art and the present invention.

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms. It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one. The term "on" means not only when a configuration is formed directly on top of another configuration, but also when a third configuration is interposed between these configurations.

Hereinafter, preferred embodiments of a light control film and a display device including the same according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a cross-sectional view for explaining a light control film according to a first example of the present invention.

Referring to FIG. 1, a light control film 10 according to a first example of the present invention includes a base film 11, and a plurality of viewing angle control patterns 15.

The base film 11 may be made of an optically isotropic material having a high light transmittance. For example, the base film 11 may be formed of a material such as polyimide (PI), cyclic olefin polymer (COP), polycabonate (PC), polyethyleneterephthalate (PET), polyethylenapthanate (PEN), polynorbornene . As another example, the base film 11 may be a barrier film attached to the upper surface of the encapsulation layer constituting the organic light emitting display panel.

Each of the plurality of viewing angle control patterns 15 controls a wide viewing angle of the display panel 1 by selectively blocking incident light, for example, light traveling from the display panel 1, And may be provided on the lower surface of the base film 11 so as to have a predetermined pitch. Each of the plurality of viewing angle control patterns 15 blocks light incident on the display panel 1 at an angle of more than a specific angle with respect to the vertical plane of the display panel 1.

The thickness of each of the plurality of viewing angle control patterns 15 can be set in accordance with the viewing angle of the display panel 1. [ For example, each of the plurality of viewing angle control patterns 15 preferably has a thickness of several tens of nanometers to several tens of micrometers. However, the present invention is not limited thereto. For example, And / or a thickness capable of blocking light traveling at an angle of +/- 30 degrees to the left and right.

2A, the plurality of viewing angle control patterns 15 have a stripe shape parallel to the first longitudinal direction Y of the base film 11, And may be provided on the lower surface of the base film 11 so as to have a predetermined pitch along the second longitudinal direction X intersecting the first longitudinal direction Y. [ In this case, the present invention can control the lateral viewing angle (or horizontal viewing angle) of the display panel 1 corresponding to the second longitudinal direction X of the base film 11.

2B, the plurality of viewing angle control patterns 15 according to another example have stripe shapes in parallel with the second longitudinal direction X of the base film 11, And may be provided on the lower surface of the base film 11 so as to have a predetermined pitch along the first longitudinal direction Y. [ In this case, the present invention can control the vertical viewing angle (or vertical viewing angle) of the display panel 1 corresponding to the first longitudinal direction Y of the base film 11.

The plurality of viewing angle control patterns 15 according to another example may be provided in the form of a mesh having a light transmitting portion on the lower surface of the base film 11, as shown in Fig. 2C. In this case, the present invention can control both the upper and lower viewing angles and the left and right viewing angles of the display panel 1.

Each of the plurality of viewing angle control patterns 15 is formed of a dark pigment such as a black pigment or a gray pigment, a dark color dye such as a black dye or a gray dye, a carbon black, or a light blocking material such as a photo resist Or a light reflecting material such as a metal such as aluminum (Al) or silver (Ag). Each of the plurality of viewing angle control patterns 15 may be formed by a printing process or a patterning process. For example, the printing process may utilize roll printing, screen printing, gravure printing, gravure-offset printing, or flexo printing methods known in the art. The patterning process may be a process of forming a mask pattern material on the base film 11 and a mask pattern material may be an etch process selectively etched. The etch process may be a wet etching process or a dry etching process, It can be a crybing process.

As described above, the light control film 10 according to the first example of the present invention has a light blocking area corresponding to each of the plurality of viewing angle control patterns 15 and a light blocking area between the plurality of viewing angle control patterns 15, Angle control patterns 15 to block light incident at an angle of more than a specific angle from the display panel 1 through each of the plurality of viewing angle control patterns 15 and to transmit light through the light transmission area between the plurality of viewing angle control patterns 15 The upper and lower and / or right and left viewing angles of the display panel 1 can be controlled at narrow viewing angles by transmitting light incident from the display panel 1 at angles less than a specific angle.

FIG. 3 is a cross-sectional view illustrating a light control film according to a second embodiment of the present invention, and FIG. 4 is a plan view illustrating the touch electrode layer shown in FIG.

3 and 4, a light control film 20 according to a second example of the present invention includes a base film 11, a toothed electrode layer 13, a protective layer 14, and a plurality of viewing angle control patterns 25 ).

Since the base film 11 is the same as the first example of the present invention described above, a duplicate description thereof will be omitted. The base film 11 may be a barrier film attached to the upper surface of the encapsulation layer constituting the organic light emitting display panel.

The touch electrode layer 13 is provided between the base film 11 and the viewing angle control pattern 25 and includes a plurality of transmission lines Tx and a plurality of reception lines Rx.

The plurality of transmission lines Tx are arranged on the lower surface of the base film 11 so as to have a predetermined pitch along the first longitudinal direction Y. [ Each of the plurality of transmission lines Tx includes a plurality of touch driving electrodes TE having a predetermined pitch along a second longitudinal direction X intersecting with the first longitudinal direction Y, And a plurality of first bridges (BG1) electrically connecting between adjacent ones of the plurality of TEs. Here, the touch driving electrode TE may have a polygonal shape, for example, a rhomboidal shape. The first bridge BG1 electrically connects the adjacent touch driving electrodes TE.

The plurality of reception lines (Rx) are arranged on the lower surface of the base film (11) so as to have a predetermined pitch along the second longitudinal direction (X). Each of the plurality of reception lines Rx is connected to a plurality of touch sensing electrodes SE arranged to have a predetermined pitch along the first longitudinal direction Y and between a plurality of touch sensing electrodes SE And a plurality of second bridges BG2. Here, the touch sensing electrode SE has the same planar shape as the touch driving electrode TE and is disposed between the touch driving electrodes TE. Accordingly, the plurality of touch driving electrodes TE and the plurality of touch sensing electrodes SE are arranged on the same side so as to have a checkered pattern. The second bridge BG2 is provided to cross the first bridge BG1 and electrically connects the adjacent touch sensing electrodes SE.

Each of the plurality of transmission lines Tx and the plurality of reception lines Rx is connected to a pad electrode of a touch pad portion PP provided at one side edge portion of the base film 11 through a routing line.

The plurality of transmission lines Tx and the plurality of reception lines Rx are provided so as to cross each other with an insulator layer (or a dielectric layer) therebetween. Accordingly, the insulating layer forms a mutual capacitance between the adjacent touch driving electrode TE and the touch sensing electrode SE. The mutual capacitance serves as a touch sensor for sensing a user's touch to the light control film 10. [

Although the plurality of transmission lines Tx and the plurality of reception lines Rx each include rhombic electrodes TE and SE, the present invention is not limited to this. bar. Further, the touch electrode layer 13 may have an electrode structure of a mutual capacitance type touch screen known in the art.

The protective layer 14 is provided on the lower surface of the base film 11 so as to cover the touch electrode layer 13.

The plurality of viewing angle control patterns 25 are provided on the lower surface of the protective layer 14 and include the light control film 10 according to the first example of the present invention ), And thus a detailed description thereof will be omitted.

The light control film 20 according to the second embodiment of the present invention provides the same effect as the light control film 10 according to the first embodiment of the present invention and serves as a touch screen for sensing the user's touch.

5 is a cross-sectional view for explaining a light control film according to a third example of the present invention.

5, the light control film 30 according to the third embodiment of the present invention includes a base film 31, a plurality of viewing angle control patterns 33, and a plurality of light absorbing patterns 35. As shown in Fig.

The base film 31 may be made of an optically isotropic material having a high light transmittance. For example, the base film 31 may be formed of a material such as polyimide (PI), cyclic olefin polymer (COP), polycarbonate (PC), polyethyleneterephthalate (PET), polyethylenapthanate (PEN), polynorbornene .

The plurality of viewing angle control patterns 33 selectively shield the incident light, for example, the light path from the backlight unit 3 of the liquid crystal display device, so that the wide viewing angle of the liquid crystal display panel 5 is changed to a narrow viewing angle And may be provided on the lower surface of the base film 31 so as to have a preset pitch and width. Each of the plurality of viewing angle control patterns 33 is moved toward the light absorption pattern 35 by blocking light L1 incident at an angle of more than a specific angle from the backlight unit 3, that is, toward the backlight unit 3 And the light efficiency of the backlight unit 3 is improved through the recycling of the reflected light.

The thickness T1 of each of the plurality of viewing angle control patterns 33 can be set according to a narrow viewing angle set in the liquid crystal display panel 5 having a relatively wide viewing angle. For example, each of the plurality of viewing angle control patterns 33 preferably has a thickness of less than 10 mu m, but the present invention is not limited thereto and may be applied to the display panel 1 vertically and / And may have a thickness capable of blocking light traveling at an angle of more than +/- 30 degrees to the left and right.

A plurality of viewing angle control patterns 33 according to an example have the same first and second lengths as the viewing angle control pattern 15 shown in Figs. Direction and at least one of the directions.

The plurality of viewing angle control patterns 33 may have a predetermined pitch and width for each region so as to correspond to the viewing angle distribution diagram of the liquid crystal display panel 5. [

Each of the plurality of viewing angle control patterns 33 may be formed of a light reflecting material such as a metal such as aluminum (Al) or silver (Ag). Each of the plurality of viewing angle control patterns 33 may be formed by a printing process or a patterning process. For example, the printing process may utilize roll printing, screen printing, gravure printing, gravure-offset printing, or flexo printing methods known in the art. The patterning process may include a step of forming a mask pattern material on the base film 31 and a mask pattern material may be an etching process for selectively etching. The etching process may be a wet etching process or a dry etching process, It can be a crybing process.

The width W of each of the plurality of viewing angle control patterns 33 may be set to 10% or more and 50% or less of the pitch P between the adjacent viewing angle control patterns 33. [ When the width W of each of the viewing angle control patterns 33 is 10% or less of the pitch P of the viewing angle control pattern 33, the amount of light passing through the light transmission areas between the plurality of viewing angle control patterns 33 There is a limit in narrowing the viewing angle of the liquid crystal display panel 5. When the width W of each of the viewing angle control patterns 33 exceeds 50% of the pitch P of the viewing angle control pattern 33, the light is transmitted through the light transmission areas between the plurality of viewing angle control patterns 33 The brightness of the liquid crystal display panel 5 is lowered.

The plurality of light absorption patterns 35 control the wide viewing angle of the liquid crystal display panel 5 by absorbing the light L2 incident at a specific angle through the light transmission region between the plurality of viewing angle control patterns 33 And may be provided on the upper surface of the base film 31 so as to be overlapped with each of the plurality of viewing angle control patterns 33 on a one-to-one basis. At this time, the width W of each of the plurality of absorption patterns 35 may be narrower than the width of the overlapping viewing angle control pattern 33.

Each of the plurality of light absorbing patterns 35 is formed of a dark pigment such as a black pigment or a gray pigment, a dark color dye such as a black dye or a gray dye, a carbon black, or a light absorbing material such as a photo resist Lt; / RTI > Each of the plurality of light absorbing patterns 35 may be formed by the same process as the viewing angle control pattern 33.

Each of the plurality of light absorption patterns 35 may have a thickness T2 that is set according to a viewing angle of the liquid crystal display panel 5 and may have a thickness greater than the viewing angle control pattern 33. [ For example, it is preferable that each of the plurality of light absorbing patterns 35 has a thickness of 10 탆 or more. However, the present invention is not limited thereto and may be applied to the display panel 1 up and down and / And may have a thickness capable of blocking light traveling at an angle of +/- 30 degrees or more. Since the viewing angle of the liquid crystal display panel 5 may become narrower as the thickness T2 of the light absorption pattern 35 increases, the thickness T2 of the light absorption pattern 35 may be smaller than the thickness T2 of the liquid crystal display panel 5. [ May be set to a thickness of 10 [micro] m or more according to a narrow viewing angle set at a predetermined angle.

The critical angle θ between one side S1 of the viewing angle control pattern 33 and the other side S2 of the light absorption pattern 35 which are adjacent to each other in the oblique direction with the base film 31 sandwiched therebetween, It is preferable that the lower surface is set at 40 to 45 degrees. The critical angle may be set by the thickness of the base film 31 or may be set by the pitch P of the viewing angle control patterns 33 and the pitch P of the light absorption patterns 35 have. In this case, the present invention can prevent an increase in the viewing angle due to the light that is not absorbed by the light absorption pattern 35 but is directed toward the liquid crystal display panel 5 without being reflected by the viewing angle control pattern 33, have.

In addition, when each of the plurality of light absorbing patterns 35 is formed by a printing process, each of the plurality of light absorbing patterns 35 includes a plurality of light absorbing pattern layers 35a and 35b, And a transparent adhesive layer 36 interposed between the plurality of light absorption pattern layers 35a and 35b. Here, the transparent adhesive layer 36 may be an optical clear adhesive (OCA), an optical curable resin (OCR), or an ultraviolet resin.

In addition, when the plurality of viewing angle control patterns 33 are formed by a printing process, the plurality of viewing angle control patterns 33 may be formed of a plurality of viewing angle control pattern layers having a transparent adhesive layer interposed therebetween as in the case of the plurality of light absorption patterns 35.

FIG. 7 is a simulation graph of an outgoing light distribution by angle incident on the light control film according to the third example of the present invention. FIG.

First, in the simulation, the viewing angle of the light control film was set to 47 degrees, and the pitch of the viewing angle control pattern of the light control film was set to 100 mu m, the width of each of the viewing angle control pattern and the light absorption pattern was set to 60 mu m, The thickness was set to 70 mu m.

As can be seen from Fig. 7, it can be seen that light of 47 degrees or more incident on the light control film is blocked by the light absorption pattern, and only light having an angle of 47 degrees or less is emitted.

The light control film 30 according to the third embodiment of the present invention is provided with a plurality of viewing angle control patterns 33 and a plurality of light absorption patterns 35 overlapping each other with the base film 31 interposed therebetween, The left and right viewing angles of the liquid crystal display panel 5 are changed to the narrow viewing angle (left and right viewing angles) by blocking the light incident at an angle of more than a specific angle from the backlight unit 3, .

8 is a view for explaining a display device according to a first example of the present invention, which constitutes a display device including a light control film according to the first or second example of the present invention.

Referring to FIG. 8, a display device 100 according to a first example of the present invention includes a display panel 110, a barrier film 130, a polarizing film 150, and a cover window 170.

The display panel 110 includes a substrate 111, a thin film transistor (TFT), a planarization layer 112, an anode electrode 113, a bank layer 114, an organic light emitting diode 115, a cathode electrode 116, And an encapsulation layer (117).

Glass is mainly used for the substrate 111, but transparent plastic such as polyimide which can be bent or rolled can be used.

The thin film transistor (TFT) is provided in a transistor region TA of each of a plurality of pixel regions PA defined on a substrate 111 and includes a gate electrode, a semiconductor layer, a source electrode, and a drain electrode have. Here, the thin film transistor may be an a-Si TFT, a poly-Si TFT, an oxide TFT, an organic TFT or the like.

The planarization layer 112 is provided on the substrate 111 so as to cover the thin film transistor TFT and is provided with a flat surface on the substrate 111 including the thin film transistor TFT.

The anode electrode 113 is provided in a pattern on the planarization layer 112 overlapping the opening area OA provided in each pixel area PA of the substrate 111. [ The anode electrode 113 is connected to the source electrode of the thin film transistor TFT through a contact hole provided in the planarization layer 112. The anode electrode 113 may be made of a metal having a high reflectivity.

The bank layer 114 is provided on the planarization layer 112 so as to cover the edge portions of the anode electrode 113 and the thin film transistors TFT and define the opening regions OA of the pixel regions PA.

The organic light emitting diode 115 is formed on the anode electrode 113 of the opening region OA defined by the bank layer 114. [ Although not shown, the organic light emitting diode 115 may have a structure in which a hole injecting layer, a hole transporting layer, an organic light emitting layer, an electron transporting layer, and an electron injecting layer are sequentially stacked. Here, one or two or more of the hole injecting layer, the hole transporting layer, the electron transporting layer, and the electron injecting layer may be omitted. The organic light emitting layer may be formed to emit light of the same color, for example, white for each pixel, and may be formed to emit light of different colors, for example, red, green, or blue for each pixel.

The cathode electrode 116 is provided on the organic light emitting diode 115 and the bank layer 114 and is commonly connected to the organic light emitting diode 115 provided in each pixel region PA. The cathode electrode 134 may be made of a transparent metal material having a high light transmittance.

The sealing layer 117 is provided on the substrate 111 so as to cover the cathode electrode 116 in order to prevent moisture penetration into each pixel. Here, the sealing layer 117 may be formed in a multi-layer structure in which an organic material layer or an inorganic material layer, an organic material layer and an inorganic material layer are alternately laminated.

The barrier film 130 is disposed on the display panel 110 and controls the viewing angle of the display panel 110 by blocking light incident on the display panel 110 at a predetermined angle or more. In addition, the barrier film 130 prevents moisture penetration into the display panel 110 and protects the front surface of the display panel 110. At this time, the barrier film 131 may be directly attached to the sealing layer 117 of the display panel 110 by the transparent adhesive 120. Here, the transparent adhesive layer 120 may be an optical clear adhesive (OCA), an optical curable resin (OCR), or an ultraviolet resin.

The barrier film 130 may include a plurality of viewing angle control patterns 133 provided on the lower surfaces of the base film 131 and the base film 131. 1 to 4 except that each of the plurality of viewing angle control patterns 133 is superimposed on the bank layer 114 provided in the display panel 110. The first or second aspect of the present invention shown in Figs. The light control films 10 and 20 according to the second embodiment are the same as those of the light control films 10 and 20 according to the second example. However, it is preferable that the base film 131 of the barrier film 130 is made of a material having a low moisture permeability, for example, a polymer material.

The polarizing film 150 is attached to the upper surface of the barrier film 130 to polarize light emitted from the display panel 110.

The cover window 170 is made of transparent glass or a transparent plastic material and attached to the upper surface of the polarizing film 150. The cover window 170 is attached to the upper surface of the polarizing film 150 by a transparent adhesive such as OCA (Optical Clear Adhesive) to transmit light emitted from the display panel 110 to the outside, (110).

The display device 100 according to the first exemplary embodiment of the present invention is configured such that a plurality of viewing angle control patterns 133 overlapping the bank layer 114 of the display panel 110 form a viewing angle control pattern 133, It is possible to have a narrow viewing angle of less than a specific angle. That is, according to the present invention, a barrier film (or a light control film) having a viewing angle control pattern 133 is disposed between the display panel 110 and the polarizing film 150, thereby changing the vertical and / or left and right viewing angles of the display device to narrow viewing angles Can be controlled.

9 is a view for explaining a display device according to a second example of the present invention, which constitutes a display device including a light control film according to the third example of the present invention.

Referring to FIG. 9, a display device 200 according to a second example of the present invention may include a display panel 210, a backlight unit 220, and a light control film 230.

The display panel 210 displays an image using light that is emitted from the backlight unit 220 and transmitted through the light control film 230. For this, the display panel 210 may include first and second substrates 211 and 213 which are bonded together by a sealant 219 with a liquid crystal layer 212 interposed therebetween.

The first substrate 211 may include a plurality of pixels having a pixel electrode coupled to the thin film transistor connected to the gate line and the data line, and a common electrode for forming an electric field in the liquid crystal layer 212 together with the pixel electrode. have.

The second substrate 213 may include a color filter superimposed on each pixel. In addition, the color filter may be provided on the first substrate 211 so as to overlap with the pixel electrode of each pixel. In this case, the second substrate 213 is used as a cover substrate.

A first polarizing film 215 is attached to the lower surface of the first substrate 211 and a second polarizing film 217 is attached to the lower surface of the second substrate 213. At this time, the polarization axis of the first polarizing film 215 and the polarization axis of the second polarizing film 217 are set to cross each other.

In addition, the positions of the first and second substrates 211 and 213 may be reversed from each other. That is, the second substrate 213 having a color filter may be disposed on the lower surface of the first substrate 211 having a plurality of pixels.

The backlight unit 220 may include a light guide plate 221, a light source 223, a reflective sheet 225, and an optical sheet unit 227 for irradiating the display panel 210 with light.

The light guide plate 221 is disposed at a lower portion of the display panel 210 and advances the light incident through the light-incident portion provided at one side thereof toward the display panel 210.

The light source 223 irradiates the light entering portion of the light guide plate 221 with light. For example, the light source 223 may include a light source lamp or a light emitting diode module.

The reflective sheet 225 is disposed under the light guide plate 221 and minimizes the loss of light by reflecting light incident through the lower surface of the light guide plate 221 to the inside of the light guide plate 221.

The optical sheet portion 227 is disposed on the light guide plate 221 and improves the luminance characteristics of light emitted from the light guide plate 221. The optical sheet portion 227 according to an example may be composed of at least two of a diffusing sheet, a condensing sheet, and a reflective polarizing sheet, or a combination thereof.

The light control film 230 is disposed between the display panel 210 and the backlight unit 220 and controls the viewing angle of the display panel 210 by blocking light incident on the backlight unit 220 at a predetermined angle or more . Since the light control film 230 is the same as the light control film 30 according to the third embodiment of the present invention shown in FIG. 5 or 6, a duplicate description thereof will be omitted.

The viewing angle control pattern 33 and the light absorption pattern 35 provided on the light control film 230 may have a pitch of about 1/2 to 1/5 of the pitch of the pixels provided on the display panel 210. That is, two to five light absorption patterns may be provided on each pixel of the display panel 210.

The display device 200 according to the second exemplary embodiment of the present invention includes a backlight unit 220 and a display panel 210. The backlight unit 220 includes a light control film 230 disposed between the display panel 210 and the backlight unit 220, ), It is possible to have a narrow viewing angle of less than a specific angle. That is, according to the present invention, the viewing angle control pattern and the light control film 230 having a light absorption pattern are interposed between the display panel 210 and the backlight unit 220 to block light exceeding a specific angle, / Or the right and left viewing angles can be controlled with a narrow viewing angle.

10, the light control film 230 may be disposed on the upper portion of the display panel 210 so as to be in contact with the display panel 210. In this case, It is also possible to control the viewing angle of the display device up / down and / or the left / right viewing angle to a narrow viewing angle by blocking light emitted above the angle. In this case, the plurality of viewing angle control patterns 33 provided on the lower surface of the light control film 230 may be omitted.

On the other hand, in the display device 200 according to the second example of the present invention, the light control film 230 is embedded in the display panel 210, as shown in Fig. 11, It is possible to control the viewing angle of the display device up / down and / or the left / right viewing angle to a narrow viewing angle. At this time, the light control film 230 may be interposed between the second substrate 213 and the second polarizing film 217 of the display panel 210. In this case, the plurality of viewing angle control patterns 33 provided on the lower surface of the light control film 230 may be omitted.

12 is a graph showing the distribution of vertical angle of view of the display device according to the related art and the present invention.

12, the solid line A shows the vertical viewing angle distribution of the conventional display device, and the dotted line B and the one-dot chain line C show the vertical viewing angle distribution of the display device according to the present invention.

First, since the conventional display device does not have the light control film according to the present invention, it can be seen that the display device has a wide vertical viewing angle of +/- 80 degrees.

On the other hand, the display device of the present invention has a vertical viewing angle of ± 30 degrees according to the viewing angle control of the light control film as indicated by a dotted line B, or a vertical viewing angle of ± 45 degrees as indicated by a chain line C.

Therefore, the present invention can control the viewing angle of the display device through the viewing angle control pattern and / or the light absorption pattern provided on the light control film.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of. Therefore, the scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention.

1, 5, 110, 210: display panel 3, 220: backlight unit
10, 20, 30, 230: light control film 11, 31, 131: base film
13: Touch screen 15, 25, 33: Viewing angle control pattern
35: light absorption pattern 36, 120: transparent adhesive layer
100, 200: display device 114: bank layer
117: sealing layer 130: barrier film
150: polarizing film 170: cover window

Claims (12)

A base film; And
And a plurality of viewing angle control patterns provided on a lower surface of the base film so as to have a preset pitch,
Wherein each of the plurality of viewing angle control patterns is provided in parallel with a longitudinal direction of at least one of first and second longitudinal directions of the base film. The method according to claim 1,
Wherein the plurality of viewing angle control patterns are made of any one of a black pigment, a gray pigment, a black dye, a gray dye, a carbon black, a photo resist, and a metal. The method according to claim 1,
A touch electrode layer having a transmission line and a reception line provided in the base film; And
And a protective layer covering the touch electrode layer,
Wherein the plurality of viewing angle control patterns are provided on a lower surface of the protective layer. The method according to claim 1,
And a plurality of light absorption patterns provided on an upper surface of the base film so as to overlap the plurality of viewing angle control patterns. 5. The method of claim 4,
Wherein the light absorption pattern is thicker than the viewing angle control pattern. 5. The method of claim 4,
Wherein the viewing angle control pattern is made of a metal material,
Wherein the light absorption pattern is made of any one of a black pigment, a gray pigment, a black dye, a gray dye, carbon black, and a photoresist. 5. The method of claim 4,
Wherein an angle between one side of the viewing angle control pattern adjacent to the base film in the oblique direction and the other side of the light absorption pattern is 40 to 45 degrees with respect to the lower surface of the base film. A display panel; And
And a light control film disposed on the display panel,
Wherein the light control film is the light control film according to any one of claims 1 to 3. 9. The method of claim 8,
The display panel includes:
A bank layer defining an opening region of the pixel; And
And an organic light emitting element provided in the opening region,
Wherein each of the plurality of viewing angle control patterns overlaps the bank layer. A display panel;
A backlight unit disposed at a lower portion of the display panel; And
And a light control film superimposed on the display panel,
Wherein the light control film is the light control film according to any one of claims 4 to 7. 11. The method of claim 10,
Wherein the light control film is disposed between the display panel and the backlight unit or disposed on the display panel. 11. The method of claim 10,
The display panel includes:
A first substrate facing the backlight unit;
A second substrate bonded to the first substrate with a liquid crystal layer therebetween; And
And a polarizing film attached to an upper surface of the second substrate,
Wherein the light control film is disposed between the second substrate and the polarizing film.

Images