KR101843466B1 - Optical member and display device - Google Patents

Abstract

An optical member and a display device are disclosed. The display device includes a plurality of light sources; An optical member disposed on the light sources; And a display panel disposed on the optical member, wherein the optical member includes a plurality of brightness uniformity enhancing portions respectively corresponding to the light sources, and each of the brightness uniformity enhancing portions includes a first transmissive portion corresponding to each light source Limitations; And a second transmission limiting section surrounding the first transmission limiting section and having a higher light transmittance than the first transmission limiting section.

Description

OPTICAL MEMBER AND DISPLAY DEVICE

An embodiment relates to an optical member and a display device.

Among display devices, there is a device that requires a backlight unit capable of generating light in order to display an image. The backlight unit is a device for supplying light to a display panel including a liquid crystal or the like and includes a light emitting device and means for effectively transmitting the light output from the light emitting device to the liquid crystal side.

As a light source of such a display device, an LED (Light Emitted Diode) or the like can be applied. Further, in order that the light output from the light source is effectively transmitted to the display panel side, a light guide plate and an optical sheet may be laminated and used.

At this time, an optical member that changes the wavelength of light generated from the light source and causes white light to enter the light guide plate or the display panel can be applied to such a display device. Particularly, in order to change the wavelength of light, a quantum dot or the like can be used.

The quantum dot has a particle size of 10 nm or less and has unique electrical and optical characteristics depending on its size. For example, when the approximate size is 55 to 65 Å, it can emit red, 40 to 50 Å to green, and 20 to 35 Å to blue. Yellow has medium size of red and green quantum dots. As the spectrum of light changes from red to blue, the size of the quantum dots varies from 65 Å to 20 Å, which may be slightly different.

In order to form the optical member including the quantum dots, the quantum dots emitting RGB or RYGB, which are three primary colors of light, can be formed by spin coating or printing on a transparent substrate such as glass. Here, when a quantum dot emitting yellow (Y) is further included, white light closer to natural light can be obtained. The matrix (medium) in which the quantum dots are dispersed can apply an inorganic substance or a polymer having excellent transmittance with respect to light in the visible light region and the ultraviolet region (including Far UV) or in the visible light region. For example, it may be inorganic silica, polymethylmethacrylate (PMMA), polydimethylsiloxane (PDMS), poly lactic acid (PLA), silicon polymer or YAG.

A display device to which such a quantum dot is applied is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0012246.

The embodiment intends to provide an optical member and a display device having improved luminance uniformity.

A display device according to an embodiment includes a plurality of light sources; An optical member disposed on the light sources; And a display panel disposed on the optical member, wherein the optical member includes a plurality of brightness uniformity enhancing portions respectively corresponding to the light sources, and each brightness uniformity enhancing portion is further away from the optical axis of each light source It has increasingly higher light transmittance.

An optical member according to an embodiment includes a light conversion layer; A first substrate disposed below the light conversion layer; A plan view on the light conversion layer includes a second substrate; And a plurality of luminance uniformity enhancing portions disposed on a lower surface of the first substrate, wherein each of the luminance uniformity enhancing portions includes: a first transmission limiting portion corresponding to each light source; And a second transmission limiting section surrounding the first transmission limiting section and having a higher light transmittance than the first transmission limiting section.

The optical member and the display apparatus according to the embodiment include a luminance uniformity enhancing section. In particular, the brightness uniformity enhancing unit corresponds to each of the light sources. In addition, the luminance uniformity enhancing portion has increasingly higher light transmittance as it goes away from the optical axis.

That is, the center portion of the brightness uniformity enhancing portion has low light transmittance and the outer portion has high light transmittance.

Accordingly, it is possible to prevent the luminance of the portion corresponding to each of the light sources from increasing. Therefore, the optical member and the display device according to the embodiments can prevent abnormal luminance unevenness such as a hot spot formed corresponding to the light sources.

Therefore, the optical member and the display device according to the embodiment can have improved luminance uniformity.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment.
FIG. 2 is a cross-sectional view showing a section cut along AA 'in FIG. 1; FIG.
3 is a perspective view showing the rear surface of the light converting member.
FIG. 4 is an enlarged view of a portion B in FIG. 3; FIG.
5 is a cross-sectional view showing light emitting diodes, a diffusion plate, and a light conversion member.
6 is a cross-sectional view showing one end surface of the light converting member.

In the description of the embodiments, it is described that each substrate, frame, sheet, layer or pattern is formed "on" or "under" each substrate, frame, sheet, In this case, "on" and "under " all include being formed either directly or indirectly through another element. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is an exploded perspective view showing a liquid crystal display device according to an embodiment. 2 is a cross-sectional view showing a section taken along the line A-A in Fig. 3 is a perspective view showing the rear surface of the light converting member. FIG. 4 is an enlarged view of a portion B in FIG. 3; FIG. 5 is a cross-sectional view showing light emitting diodes, a diffusion plate, and a light conversion member. 6 is a cross-sectional view showing one end surface of the light converting member.

1 to 6, a liquid crystal display according to an embodiment includes a backlight unit 10 and a liquid crystal panel 20.

The backlight unit 10 emits light to the liquid crystal panel 20. The backlight unit 10 is a surface light source and can uniformly irradiate the bottom surface of the liquid crystal panel 20 with light.

The backlight unit 10 is disposed under the liquid crystal panel 20. The backlight unit 10 includes a bottom cover 100, a light source such as a plurality of light emitting diodes 300, a printed circuit board 200, a diffusion plate 400 and a plurality of optical sheets 500 .

The bottom cover 100 has a top opened shape. The bottom cover 100 receives the diffusion plate 400, the light emitting diodes 300, the printed circuit board 200, the reflective sheet 300, and the optical sheets 500.

The light emitting diodes 300 are light sources for generating light. The light emitting diodes 300 are disposed in the bottom cover 100. The light emitting diodes 300 generate light to be incident on the diffusion plate 400 through the back surface of the diffusion plate 400.

The light emitting diodes 300 may be a blue light emitting diode for generating blue light or a UV light emitting diode for generating ultraviolet light. That is, the light emitting diodes 300 may generate blue light having a wavelength range of about 430 nm to about 470 nm or ultraviolet light having a wavelength range of about 300 nm to about 400 nm.

The light emitting diodes 300 are mounted on the printed circuit board 200. The light emitting diodes 300 are disposed under the printed circuit board 200. The light emitting diodes 300 are driven by receiving a driving signal through the printed circuit board 200.

The printed circuit board 200 is electrically connected to the light emitting diodes 300. The printed circuit board 200 may mount the light emitting diodes 300. The printed circuit board 200 is disposed inside the bottom cover 100.

A reflective layer may be coated on the upper surface of the printed circuit board 200.

The diffusion plate 400 is disposed on the light emitting diodes 300. The diffusion plate 400 diffuses the light emitted from the light emitting diodes 300. The diffusion plate 400 may diffuse the light from the light emitting diodes 300 by scattering, reflecting, or the like. Accordingly, the diffusion plate 400 can improve the luminance uniformity.

The diffusion plate 400 may include a plurality of beads for scattering light emitted from the light emitting diodes 300.

The optical sheets 500 are disposed on the diffusion plate 400. The optical sheets 500 change or enhance the characteristics of light emitted from the upper surface of the diffusion plate 400, and supply the light to the liquid crystal panel 20.

The optical sheets 500 may be a light conversion member 501, a first prism sheet 502, and a second prism sheet 503. [

The light conversion member 501 may be disposed on the light path between the light source 300 and the liquid crystal panel 20. For example, the light conversion member 501 may be disposed on the diffusion plate 400. More specifically, the light conversion member 501 may be interposed between the diffusion plate 400 and the first prism sheet 502. The light conversion member 501 can convert the wavelength of the incident light and emit the light upward.

For example, when the light emitting diodes 300 are a blue light emitting diode, the light converting member 501 may convert blue light emitted upward from the diffusion plate 400 into green light and red light. That is, the light conversion member 501 converts a part of the blue light into green light having a wavelength band of about 520 nm to about 560 nm, and converts the other part of the blue light to a light having a wavelength range of about 630 nm to about 660 nm It can be converted into red light.

Accordingly, light passing through the light conversion member 501 without conversion and light converted by the light conversion member 501 can form white light. That is, the blue light, the green light, and the red light may be combined, and the white light may be incident on the liquid crystal panel 20.

That is, the photo-conversion member 501 is an optical member that converts the characteristics of the incident light. The photo-conversion member 501 has a sheet shape. That is, the photo-conversion member 501 may be an optical sheet.

3 to 6, the photo-conversion member 501 includes a lower substrate 510, an upper substrate 520, a photo-conversion layer 530, and a plurality of luminance uniformity enhancing units 540 .

The lower substrate 510 is disposed on the light emitting diodes 300. In addition, the lower substrate 510 is disposed on the diffusion plate 400. In addition, the lower substrate 510 is disposed under the light conversion layer 530. The lower substrate 510 is transparent and flexible. The lower substrate 510 may be in close contact with the lower surface of the light conversion layer 530.

Examples of the material used for the lower substrate 510 include transparent polymers such as polyethylene terephthalate (PET) and the like.

The upper substrate 520 is disposed on the light conversion layer 530. The upper substrate 520 is transparent and flexible. The upper substrate 520 may be in close contact with the upper surface of the light conversion layer 530.

Examples of materials used for the upper substrate 520 include transparent polymers such as polyethylene terephthalate.

The lower substrate 510 and the upper substrate 520 sandwich the light conversion layer 530. The lower substrate 510 and the upper substrate 520 support the light conversion layer 530. The lower substrate 510 and the upper substrate 520 protect the light conversion layer 530 from external physical impacts. The lower substrate 510 and the upper substrate 520 may be in direct contact with the light conversion layer 530.

In addition, the lower substrate 510 and the upper substrate 520 have low oxygen permeability and moisture permeability. Accordingly, the lower substrate 510 and the upper substrate 520 can protect the light conversion layer 530 from external chemical impacts such as moisture and / or oxygen.

The light conversion layer 530 is interposed between the lower substrate 510 and the upper substrate 520. The light conversion layer 530 may be in close contact with the upper surface of the lower substrate 510 and may be in close contact with the lower surface of the upper substrate 520.

The photo-conversion layer 530 includes a plurality of photo-conversion particles 531 and a host layer 532.

The photo-conversion particles 531 are disposed between the lower substrate 510 and the upper substrate 520. More specifically, the photo-conversion particles 531 are uniformly dispersed in the host layer 532 and the host layer 532 is disposed between the lower substrate 510 and the upper substrate 520.

The photoconversion particles 531 convert the wavelength of the light emitted from the light emitting diodes 300. The light conversion particles 531 receive the light emitted from the light emitting diodes 300 and convert the wavelength. For example, the light conversion particles 531 may convert blue light emitted from the light emitting diodes 300 into green light and red light. That is, some of the light conversion particles 531 convert the blue light into green light having a wavelength range of about 520 nm to about 560 nm, and another part of the light conversion particles 531 converts the blue light to about 630 And can be converted into red light having a wavelength band of from about nm to about 660 nm.

Alternatively, the photoconversion particles 531 may convert ultraviolet rays emitted from the light emitting diodes 300 into blue light, green light, and red light. That is, some of the light conversion particles 531 convert the ultraviolet light into blue light having a wavelength range of about 430 nm to about 470 nm, and another part of the light conversion particles 531 converts the ultraviolet light to about 520 Can be converted into green light having a wavelength band between nm and 560 nm. Further, another part of the photo-converted particles 531 may convert the ultraviolet ray into red light having a wavelength band of about 630 nm to about 660 nm.

That is, when the light emitting diodes 300 are blue light emitting diodes that generate blue light, the light conversion particles 531 that convert blue light into green light and red light, respectively, may be used. Alternatively, when the light emitting diodes 300 are UV light emitting diodes that generate ultraviolet rays, the light conversion particles 531 that convert ultraviolet light into blue light, green light, and red light, respectively, may be used.

The photoconversion particles 531 may be a plurality of quantum dots (QDs). The quantum dot may include core nanocrystals and shell nanocrystals surrounding the core nanocrystals. In addition, the quantum dot may include an organic ligand bound to the shell nanocrystal. In addition, the quantum dot may include an organic coating layer surrounding the shell nanocrystals.

The shell nanocrystals may be formed of two or more layers. The shell nanocrystals are formed on the surface of the core nanocrystals. The quantum dot may convert the wavelength of the light incident on the core core crystal into a long wavelength through the shell nanocrystals forming the shell layer and increase the light efficiency.

The quantum dot may include at least one of a group II compound semiconductor, a group III compound semiconductor, a group V compound semiconductor, and a group VI compound semiconductor. More specifically, the core nanocrystals may include Cdse, InGaP, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS. The shell nanocrystals may include CuZnS, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS. The diameter of the quantum dot may be 1 nm to 10 nm.

The wavelength of light emitted from the quantum dots can be controlled by the size of the quantum dots or the molar ratio of the molecular cluster compound and the nanoparticle precursor in the synthesis process. The organic ligand may include pyridine, mercapto alcohol, thiol, phosphine, phosphine oxide, and the like. The organic ligands serve to stabilize unstable quantum dots after synthesis. After synthesis, a dangling bond is formed on the outer periphery, and the quantum dots may become unstable due to the dangling bonds. However, one end of the organic ligand is in an unbonded state, and one end of the unbound organic ligand bonds with the dangling bond, thereby stabilizing the quantum dot.

Particularly, when the quantum dot has a size smaller than the Bohr radius of an exciton formed by electrons and holes excited by light, electricity or the like, a quantum confinement effect is generated to have a staggering energy level and an energy gap The size of the image is changed. Further, the charge is confined within the quantum dots, so that it has a high luminous efficiency.

Unlike general fluorescent dyes, the quantum dots vary in fluorescence wavelength depending on the particle size. That is, as the size of the particle becomes smaller, it emits light having a shorter wavelength, and the particle size can be adjusted to produce fluorescence in a visible light region of a desired wavelength. In addition, since the extinction coefficient is 100 to 1000 times higher than that of a general dye, and the quantum yield is also high, it produces very high fluorescence.

The quantum dot can be synthesized by a chemical wet process. Here, the chemical wet method is a method of growing particles by adding a precursor material to an organic solvent, and the quantum dots can be synthesized by a chemical wet method.

The host layer 532 surrounds the photo-conversion particles 531. That is, the host layer 532 uniformly disperses the light conversion particles 531 therein. The host layer 532 may be comprised of a polymer. The host layer 532 is transparent. That is, the host layer 532 may be formed of a transparent polymer.

The host layer 532 is disposed between the lower substrate 510 and the upper substrate 520. The host layer 532 may be in close contact with the upper surface of the lower substrate 510 and the lower surface of the upper substrate 520.

The light conversion member 501 may further include a first inorganic protective film 550 and a second inorganic protective film 560. The first inorganic protective film 550 may be coated on the lower surface of the lower substrate 510 and the second inorganic protective film 560 may be coated on the upper surface of the upper substrate 520. Examples of the material used for the first inorganic protective film 550 and the second inorganic protective film 560 include silicon oxide and the like.

The brightness uniformity enhancing units 540 are disposed below the lower substrate 510. In more detail, the brightness uniformity enhancing units 540 may be disposed on the lower surface of the lower substrate 510. More specifically, the luminance uniformity enhancing portions 540 may be disposed at the lowermost portion of the light conversion member 501. [ That is, when the first inorganic protective film 550 is coated on the lower surface of the lower substrate 510, the luminance uniformity enhancing portions 540 may be disposed on the lower surface of the first inorganic protective film 550.

The brightness uniformity enhancing units 540 may be printed on the lower surface of the first inorganic protective film 550. The brightness uniformity enhancing units 540 may be coated on the lower surface of the first inorganic protective film 550. That is, the brightness uniformity enhancing units 540 may be formed directly on the lower surface of the first inorganic protective film 550.

As shown in FIG. 5, the luminance uniformity enhancing units 540 correspond to the light emitting diodes 300, respectively. More specifically, the centers of the luminance uniformity enhancing units 540 may correspond to the optical axis OA of the light emitting diodes 300, respectively.

The brightness uniformity enhancing units 540 can reduce the transmitted light. That is, the brightness uniformity enhancing units 540 may have lower transmittance than the lower substrate 510. The light transmittance of the brightness uniformity enhancing units 540 may vary depending on the position. More specifically, the light transmittance of the luminance uniformity enhancing units 540 may gradually increase from the center to the outer periphery. That is, the light transmittance of the central portion of the brightness uniformity enhancing portions 540 is the lowest, and the light transmittance of the outer portion of the brightness uniformity enhancing portions 540 is the highest.

4 and 6, each of the luminance uniformity enhancement units 540 includes a first transmission limiting unit 541, a second transmission limiting unit 542, a third transmission limiting unit 543, a fourth transmission limiting unit 543, Transmission limiting section 544, fifth transmission limiting section 545, sixth transmission limiting section 546, seventh transmission limiting section 547, eighth transmission limiting section 548, ninth transmission limiting section 549 And a tenth transmission limiting section 550. [0064]

The first transmission limiting portion 541 corresponds to the light emitting diodes 300, respectively. More specifically, the first transmission limiting portion 541 may correspond to the optical axis OA of the light emitting diodes 300, respectively. More specifically, the center of the first transmission limiting section 541 may correspond to the optical axis OA of the light emitting diodes, respectively.

The first transmission limiting portion 541 may have a dot shape. More specifically, the first transmission limiting section 541 may have a circular shape. The diameter of the first transmission limiting portion 541 may be about 50 탆 to about 150 탆. The first transmission limiting portion 541 may have a low light transmittance. For example, the light transmittance of the first transmission limiting portion 541 may be about 0% to about 15%.

The second transmission limiting portion 542 surrounds the first transmission limiting portion 541 and has a higher light transmittance than the first transmission limiting portion 541. The third transmission limiting portion 543 surrounds the second transmission limiting portion 542 and has a higher light transmittance than the second transmission limiting portion 542.

In addition, the fourth transmission limiting section 544 surrounds the third transmission limiting section 543, has a higher light transmittance than the third transmission limit, and the fifth transmission limiting section 545 restricts the fourth transmission And a second transmissive limiting portion (545) surrounding the confining portion (544) and having a higher light transmittance than the fourth transmissive limit, the sixth transmissive limiting portion (546) surrounding the fifth transmissive limiting portion (545) It has high light transmittance.

Also, the seventh transmission limiting section 547 surrounds the sixth transmission limiting section 546, has a higher light transmittance than the sixth transmission limit, and the eighth transmission limiting section 548 restricts the seventh Transmissive limiting portion 547 and has a higher light transmittance than the seventh transmissive limit and the ninth transmission limiting portion 549 surrounds the eighth transmission limiting portion 548, The tenth transmission limiting portion 550 surrounds the ninth transmission limiting portion 549, and has a higher light transmittance than the ninth transmission limit, with higher light transmittance.

The width W of the second to the tenth transmission limiting portions 542, 543, ... 550 may be about 100 μm to about 200 μm. In addition, the luminance uniformity enhancement unit 540 may have a circular shape and may have a diameter (R) of about 1 mm to about 2 mm.

The difference in light transmittance between the first transmission limiting portion 541 and the second transmission limiting portion 542 may be about 5% to about 15%. The difference in light transmittance between the second transmission limiting portion 542 and the third transmission limiting portion 543 may be about 5% to about 15%. The difference in light transmittance between the third transmission limiting portion 543 and the fourth transmission limiting portion 544 may be about 5% to about 15%. As such, the difference in light transmittance between the adjacent transmission limiting portions can be about 5% to about 15%. More specifically, the difference in light transmittance between adjacent ones of the transmission limiting portions may be about 9% to about 11%.

The luminance uniformity enhancement unit 540 may include a concavo-convex pattern. More specifically, the brightness uniformity enhancement unit 540 can adjust the light transmittance according to positions by the shape and / or density of the concavo-convex pattern.

In addition, the luminance uniformity enhancement unit 540 may include colored ink. More specifically, the brightness uniformity enhancement unit 540 can adjust the light transmittance by position by adjusting the concentration of the ink.

The luminance uniformity enhancement unit 540 may be formed by a printing process such as an inkjet process, a silk screen process, or the like.

The first prism sheet 502 is disposed on the light conversion member 501. The second prism sheet 503 is disposed on the first prism sheet 502. The first prism sheet 502 and the second prism sheet 503 increase the straightness of light passing therethrough.

The liquid crystal panel 20 is disposed on the optical sheets 500. The liquid crystal panel 20 is disposed on the panel guide 24. The liquid crystal panel 20 may be guided by the panel guide 24.

The liquid crystal panel 20 displays an image by adjusting the intensity of light passing through the liquid crystal panel 20. That is, the liquid crystal panel 20 is a display panel for displaying an image using light emitted from the backlight unit 10. [ The liquid crystal panel 20 includes a TFT substrate, a color filter substrate, and a liquid crystal layer interposed between the two substrates. In addition, the liquid crystal panel 20 includes polarizing filters.

Although not shown in detail in the drawing, the TFT substrate and the color filter substrate will be described in detail. In the TFT substrate, a plurality of gate lines and data lines intersect to define pixels, and thin film transistors (TFTs) transistors are connected in one-to-one correspondence with the pixel electrodes mounted on the respective pixels. The color filter substrate includes color filters of R, G and B colors corresponding to the respective pixels, a black matrix for covering the gate lines, the data lines and the thin film transistors and the like, and a common electrode covering both of them.

At the edges of the liquid crystal panel 20, driving PCBs 21 and 52 for supplying driving signals to gate lines and data lines are provided.

The driving PCBs 21 and 52 are electrically connected to the liquid crystal panel 20 by a chip on film (COF) 24. Here, the COF may be changed to a TCP (Tape Carrier Package).

As described above, the brightness uniformity enhancement unit 540 corresponds to the light emitting diodes 300, respectively. In addition, the luminance uniformity enhancement unit 540 has increasingly higher light transmittance as it moves away from the optical axis OA of the light emitting diodes 300.

That is, the central portion of the brightness uniformity enhancement unit 540 has low light transmittance and the outer portion has high light transmittance. Accordingly, it is possible to prevent the brightness of the portions corresponding to the light emitting diodes 300 from increasing abnormally. Accordingly, the liquid crystal display according to the embodiment can prevent uneven luminance unevenness such as hot spots formed in correspondence with the light emitting diodes 300.

Therefore, the liquid crystal display according to the embodiment can have improved luminance uniformity.

In addition, the features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (14)

Printed circuit board;
A plurality of light sources disposed on the printed circuit board;
A diffusion plate disposed on the light sources;
A light conversion member disposed on the diffusion plate; And
And a display panel disposed on the photo-conversion member,
Wherein the photo-
A lower substrate;
An upper substrate on the lower substrate;
A light conversion layer disposed between the lower substrate and the upper substrate; And
And a plurality of luminance uniformity enhancing portions disposed under the lower substrate,
Wherein the light conversion layer comprises:
Host;
A plurality of quantum dots dispersed in the host,
Wherein the lower substrate and the upper substrate include polyethyleneterephthalate (PET)
The center of each brightness uniformity enhancing portion corresponds to the optical axis of each light source,
The transmittance of the brightness uniformity enhancing portion is lower than the transmittance of the lower substrate,
Each luminance uniformity enhancing portion has increasingly higher light transmittance as it goes away from the optical axis of each light source,
Wherein the diffusion plate includes a plurality of beads for scattering light emitted from the plurality of light sources,
Wherein the plurality of light sources are a plurality of blue light emitting diodes. The apparatus of claim 1, wherein each of the luminance uniformity enhancing units
A first transmission limiting unit corresponding to each light source;
And a second transmissive restricting portion surrounding the periphery of the first transmissive restricting portion and having a higher light transmittance than the first transmissive restricting portion. The method according to claim 1,
Wherein the photo-
A first inorganic protective film disposed on a lower surface of the lower substrate; And
And a second inorganic protective film disposed on the upper surface of the upper substrate. The display device according to claim 3, wherein the luminance uniformity enhancing portion is disposed in the first inorganic protective film. The display device according to claim 2, wherein the second transmission limiting portion has an annular shape. The display device according to claim 5, wherein a width of the second transmission limiting portion is 100 m to 200 m. 3. The method of claim 2,
Wherein the luminance uniformity enhancement section further includes a third transmission limiting section surrounding the periphery of the second transmission limiting section and having a higher light transmittance than the second transmission limiting section. The display device according to claim 7, wherein a difference in light transmittance between the first transmission limiting section and the second transmission limiting section is 5% to 15%. The display device according to claim 8, wherein a difference in light transmittance between the second transmission limiting section and the third transmission limiting section is 5% to 15%. The apparatus of claim 1, wherein the luminance uniformity enhancing unit has a circular shape,
And the diameter of the brightness uniformity enhancing portion is 1 mm to 2 mm. 8. The method of claim 7,
Wherein the luminance uniformity-
A fourth transmission limiting section surrounding the third transmission limiting section and having a higher light transmittance than the third transmission limiting section;
A fifth transmission limiting portion surrounding the fourth transmission limiting portion and having a higher light transmittance than the fourth transmission limiting portion;
A sixth transmission limiting portion surrounding the fifth transmission limiting portion and having a higher light transmittance than the fifth transmission limiting portion;
A seventh transmission limiting portion surrounding the sixth transmission limiting portion and having a higher light transmittance than the sixth transmission limiting portion;
An eighth transmission limiting section surrounding the seventh transmission limiting section and having a higher light transmittance than the seventh transmission limiting section;
A ninth transmission limiting portion surrounding the eighth transmission limiting portion and having a higher light transmittance than the eighth transmission limiting portion; And
And a tenth transmission limiting section surrounding the ninth transmission limiting section and having a higher light transmittance than the ninth transmission limiting section. 12. The image display device according to claim 11, wherein the diameter of the brightness uniformity enhancing portion is 1 mm to 2 mm,
Wherein the first transmission limiting portion has a dot shape, the diameter of the first transmission limiting portion is 50 mu m to 150 mu m,
And the widths of the second to tenth transmission limiting portions are 100 占 퐉 to 200 占 퐉. delete delete

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