TW201740168A - Display device - Google Patents

Abstract

A display device includes a display panel and a polarizer. The polarizer is adapted for being disposed on a light-exiting surface of a display panel. The polarizer includes a first protection layer, several light-expanding groups, a second protection layer and a polarizer layer. The first protection layer has several light-expanding regions. Each light-expanding group is formed on the corresponding light-expanding region. The polarizer layer is formed between the first protection layer and the second protection layer.

Description

Display device

The present invention relates to a display device, and more particularly to a display device having a population of light-expanding particles.

In a conventional display device, such as a liquid crystal display device, when the viewer is looking at and viewing the screen displayed by the display device, the brightness of the screen is not the same. In general, the brightness of the oblique view is lower than the brightness of the viewing, which results in an unclear picture when viewing obliquely.

Therefore, there is an urgent need to propose a new technique to improve the above-mentioned conventional problems.

Accordingly, the present invention provides a display device which can ameliorate the above-mentioned conventional problems.

According to an embodiment of the invention, a display device is proposed. The display device includes a display panel and a polarizing plate. The polarizing plate is disposed on the side of the light emitting surface of the display panel. The polarizing plate includes a first protective layer, a plurality of light-expanding particle groups, a second protective layer and a polarizing layer. The first protective layer has a plurality of light-expanding regions. Each of the light-expanding particle groups is formed in a corresponding light-expanding region. The polarizing layer is formed between the first protective layer and the second protective layer. In order to better understand the above and other aspects of the present invention, the following is a special The preferred embodiment, together with the drawings, is described in detail as follows:

100‧‧‧ display device

110‧‧‧ display panel

110b‧‧‧Back

110u‧‧‧Glossy

111‧‧‧Photo area

111A‧‧‧The first sub-pixel area

111A1‧‧‧First Drive Zone

111A2‧‧‧Second drive zone

111B‧‧‧Second sub-pixel area

111C‧‧‧ Third sub-pixel area

112‧‧‧Color filters

113‧‧‧Liquid layer

114‧‧‧Thin film transistor layer

120‧‧‧First polarizer

121‧‧‧First protective layer

1211‧‧‧Lighting area

1211A‧‧‧First sub-diffusing area

District 1211A1‧‧‧

1211A2‧‧‧Second District

1211B‧‧‧Second sub-diffusing area

District 1211B1‧‧‧

1211C‧‧‧ Third sub-diffusing area

122‧‧‧ polarizing layer

123‧‧‧Second protective layer

124‧‧‧Enhanced layer

1241‧‧‧Enhanced particle swarm

130‧‧‧Adhesive layer

140‧‧‧Second polarizer

150‧‧‧Backlight module

D1‧‧‧ OD

H1‧‧‧ Height

L1‧‧‧Light

M1‧‧‧ microstructure

S1‧‧ interval

Θ‧‧‧ angle

1 is a partial cross-sectional view of a display device in accordance with an embodiment of the present invention.

Fig. 2 is a partial plan view showing the polarizing plate of Fig. 1.

3 is a partial plan view of a polarizing plate according to another embodiment of the present invention.

4 is a partial plan view of a polarizing plate according to another embodiment of the present invention.

FIG. 5 is a partial plan view of a polarizing plate according to another embodiment of the present invention.

FIG. 6 is a partial plan view of a polarizing plate according to another embodiment of the present invention.

Please refer to FIG. 1 , which is a partial cross-sectional view of a display device 100 in accordance with an embodiment of the present invention. The display device 100 includes a display panel 110 , a first polarizing plate 120 , an adhesive layer 130 , a second polarizing plate 140 , and a backlight module 150 . The adhesive layer 130 is formed between the display panel 110 and the first polarizing plate 120 to bond the display panel 110 and the first polarizing plate 120. The display panel 110 is, for example, a liquid crystal display panel, but may be other types of display panels. In the liquid crystal display panel, the display panel 110 may include a color filter 112, a liquid crystal layer 113, and a thin film transistor layer 114. The liquid crystal layer 11 is disposed between the color filter 112 and the thin film transistor layer 114. The display panel 110 has a light emitting surface 110u and a back surface 110b opposite to each other, wherein the back surface 110b faces the backlight module 150.

In this embodiment, the first polarizing plate 120 is disposed on the side of the light emitting surface 110u of the display panel 110 to emit light L1 through the display panel 110. Enlarge the light to the two sides. The term "lighting" as used herein refers to optical properties such as "light refraction", "light scattering" and/or "light diffraction" that extend the range of illumination or redistribution of light. Since the first polarizing plate 120 can diffuse the light L1 emitted through the display panel 110 to the two sides, the apparent brightness of the oblique view can be increased, and the oblique view and the apparent brightness of the viewing are substantially close to each other. The term "oblique" as used herein means that the angle θ of Fig. 1 is greater than 0 degrees of viewing angle, and "looking" means that the angle of view θ as shown in Fig. 1 is substantially equal to 0 degrees.

The first polarizing plate 120 includes a first protective layer 121 , a polarizing layer 122 , a second protective layer 123 , and a light diffusing layer 124 . The polarizing layer 122 is located between the first protective layer 121 and the second protective layer 123. The polarizing layer 122 may be a polyvinyl alcohol (PVA) resin film which can be obtained by saponifying polyvinyl acetate resin. Examples of the polyvinyl acetate resin include a single polymer of vinyl acetate, that is, polyvinyl acetate, and a copolymer of vinyl acetate and other monomers copolymerizable with vinyl acetate. Other examples of monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, ethyl acrylate, propyl acrylate, methyl methacrylate), olefins (e.g., ethylene, propylene, 1). -butene, 2-propene), vinyl ether (such as ethyl vinyl ether, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether), unsaturated sulfonic acid (such as vinyl sulfonic acid, vinyl) Sodium sulfonate) and so on.

The materials of the first protective layer 121 and/or the second protective layer 123 may be respectively selected from polymethylmethacrylate (PMMA), Triacetyl Cellulose (TAC), acrylic resin film, polyaromatic hydroxy group. a resin film, a polyether resin film, a cyclic polyolefin resin film (for example, a polybornene resin film), Polyurethane (Polyethylene Terephthalate, PET), Polypropylene (PP), Cyclo Olefin Polymer (COP), Polycarbonate (PC), and any combination of the above.

The first protective layer 121 defines or has a plurality of light-expanding regions 1211. The light-enhancing layer 124 includes a plurality of light-expanding particle groups 1241, and each of the light-expanding particle groups 1241 is formed in the corresponding light-expanding region 1211. In addition, the thin film transistor layer 114 of the display panel 110 has a plurality of pixel regions 111, and the regions of the light-expanding regions 1211 correspond to the plurality of pixel regions 111 of the display panel 110; for example, a region of the light-expanding region 1211. The area of one pixel area 111 corresponds to the thickness direction of the display device 100; alternatively, the shape and/or area of the light-enlarged area 1211 is similar or identical to the shape and/or area of the corresponding pixel area 111.

Please refer to FIG. 2 , which is a partial plan view of the first polarizing plate 120 of FIG. 1 . As can be seen from the figure, several microstructures M1 are distributed in two dimensions. In addition, each pixel region 111 may include a plurality of sub-pixel regions, and each of the light-expanding regions 1211 includes a plurality of sub-light-expanding regions, wherein the sub-light-expanding regions may correspond to the sub-pixel regions.

For example, as shown in FIG. 2, the pixel region 111 includes a first sub-pixel region 111A, a second sub-pixel region 111B, and a third sub-pixel region 111C, wherein the first sub-pixel region 111A, The two sub-pixel regions 111B and the third sub-pixel regions 111C may respectively correspond to one of a red filter region, a green filter region and a blue filter region of the color filter 112 of the display panel 110, for example, One sub-pixel area 111A corresponds to the red filter area, the second sub-pixel area 111B corresponds to the green filter area, and the third sub-pixel area 111C corresponds to the blue filter area. However, this corresponding configuration method can be set according to the product. It is not limited to this embodiment.

Each of the light-expanding regions 1211 of the first protective layer 121 may include a first sub-diffusing region 1211A, a second sub-diffusing region 1211B, and a third sub-diffusing region 1211C, wherein the first sub-diffusing region 1211A and the second sub-diffusion region The light region 1211B and the third sub-light-diffusing region 1211C correspond to the first sub-pixel region 111A, the second sub-pixel region 111B, and the third sub-pixel region 111C, respectively.

In an embodiment, the pixel region 111 may further include a fourth sub-pixel region (not shown), and the fourth sub-pixel region (not shown) corresponds to a yellow filter region. Each of the light-expanding regions 1211 of the first protective layer 121 may further include a fourth sub-light-expanding region (not shown), and the fourth sub-light-expanding region (not shown) corresponds to the fourth sub-pixel region (not shown) Show). In summary, the embodiment of the present invention does not limit the number of sub-pixel regions of the pixel region 111.

Each of the light-expanding particle groups 1241 (shown in FIG. 1) includes a plurality of microstructures M1 in which a plurality of microstructures M1 are isolated from each other. The microstructure M1 can be formed on the first protective layer 121 by, for example, printing, printing, yellow photolithography, dropping, physical transfer, stamping, and the like.

The microstructure M1 is formed, for example, of a transparent or translucent material. In addition, the material of the microstructure M1 may be a material such as a UV acrylic resin, a polymer material, a ruthenium gel or a polyethylene terephthalate (PET).

The outer diameter D1 of each microstructure M1 may be between 10 ^-6 meters and 10 ^-3 meters and/or the interval S1 of the adjacent two microstructures M1 is between 10 ^-6 meters and 10 ^{- 4} meters. In between, the microstructure M1 is on the micrometer scale. In this way, the microstructures M1 can provide excellent periodicity, and the light ray L1 penetrating the light-expanding particle group 1241 can be made to generate light-expanding characteristics. Further, since the outer diameter D1 of each microstructure M1 may be between 10 ^-6 meters and 10 ^-3 meters and/or the interval S1 of the adjacent two microstructures M1 is between 10 ^-6 meters and 10 Between ^-4 meters, suitable for red, green and blue light to produce a light-enhancing effect after penetrating the microstructure M1. In addition, as shown in the enlarged view of FIG. 1, the height H1 of each microstructure M1 may be between 10 ^-6 meters and 10 ^-3 meters, and the light L1 penetrating the light-expanding particle group 1241 can also be generated. Light expansion characteristics. In an embodiment, the ratio of the height H1 of the microstructure M1 to the outer diameter D1 (H1/D1) may be between 0.1 and 1.0.

In addition, each sub-pixel region corresponds to the sub-light-expanding region, so that the light penetrating the sub-pixel region can be diffused to the two sides by the light-expanding particle group 1241 located on the sub-light-expanding region. For example, as shown in FIG. 2, the first sub-pixel area 111A, the second sub-pixel area 111B, and the third sub-pixel area 111C of the pixel area 111 and the first sub-expansion of the light-expanding area 1211, respectively. The light region 1211A, the second sub-diffusing region 1211B, and the third sub-diffusing region 1211C correspond to light passing through the first sub-pixel region 111A, the second sub-pixel region 111B, and the third sub-pixel region 111C. L1 (not shown in FIG. 2) is transmitted through the expanded particle group 1241 (not shown in FIG. 2) and the second sub-diffused region 1211B in the first sub-light-diffusing region 1211A of the light-expanding region 1211. The light-emitting particle group 1241 (not shown in FIG. 2) and the light-expanding particle group 1241 (not shown in FIG. 2) in the third sub-light-diffusing region 1211C are diffused to the two sides.

In addition, as shown in FIG. 2, the ratio of the total area of the corresponding light-expanding region 1211 to the corresponding light-expanding region 1211 may be between 20% and 80%; Can make the oblique view and the apparent brightness of the viewing look close to one To. Further, when the ratio of the total area of the light-enhancing particle group 1211 to the light-expanding region 1211 and the area ratio of the light-expanding region 1211 is larger, the density of the microstructure M1 of the light-expanding particle group 1241 is higher, and the oblique view is observed. The higher the brightness, the lower the opposite. Since the ratio of the total area of the corresponding light-expanding regions 1211 and the corresponding light-expanding region 1211 of each of the light-expanding particle groups 1241 may be between 20 and 80, the optical performance of the oblique viewing and the viewing is relatively close. Consistent.

In another embodiment, the microstructure M1 is not limited to the first sub-diffusing region 1211A, the second sub-diffusing region 1211B, and the third sub-diffusing region 1211C formed in the light-expanding region 1211, and may be formed therein. One or some.

Please refer to FIG. 3, which is a partial plan view of a first polarizing plate 120 according to another embodiment of the present invention. In this embodiment, the sub-pixel area of the display panel 110 can be divided into a plurality of driving areas, and the display panel 110 drives the driving voltages of the liquid crystal molecules corresponding to the plurality of driving areas to be different, so as to achieve oblique viewing and viewing. The effect of optometry as close as possible. The sub-light-diffusing region of the light-expanding region 1211 includes a plurality of regions, and the light-expanding particle group 1241 may be formed in one, some or all of the plurality of regions of the light-expanding region 1211 to compensate for the lack of driving of the display panel 110. The optical performance of the oblique view and the viewing is closer and more consistent.

For example, the first sub-pixel region 111A may include a first driving region 111A1 and a second driving region 111A2, and the display panel 110 drives a driving voltage of the liquid crystal molecules corresponding to the first driving region 111A1. The driving voltage system corresponding to the liquid crystal molecules corresponding to the second driving region 111A2 is different to achieve the effect that the viewing brightness is as close as possible to the viewing brightness. The first sub-diffusing region of the light-expanding region 1211 The field 1211A includes a first area 1211A1 and a second area 1211A2, wherein the plurality of microstructures M1 of the light-expanding particle group 1241 can form one of the first area 1211A1 and the second area 1211A2, such as in the second area 1211A2, to compensate for the display. The panel 110 is driving the deficiencies corresponding to the optical compensation of the second zone 1211A2. In another embodiment, the microstructure M1 may be formed in the first region 1211A1, but not in the second region 1211A2; or, the microstructure M1 may be formed in both the first region 1211A1 and the second region 1211A2, and The arrangement, density, height H1 and/or outer diameter D1 of the microstructure M1 in both the region 1211A1 and the second region 1211A2 may be different.

Please refer to FIG. 4, which is a partial top view of the first polarizing plate 120 according to another embodiment of the present invention. Different from the embodiment of FIG. 3, the plurality of microstructures M1 of the embodiment are formed only in some sub-light-diffusing regions of the light-expanding region 1211, such as the first sub-diffusing region 1211A and the second sub-diffusing region 1211B. However, it is not formed in other sub-light-diffusing regions of the light-expanding region 1211, such as the third sub-diffusing region 1211C. In one embodiment, the arrangement, density, height H1 and/or outer diameter D1 of the microstructure M1 in the first sub-diffusing region 1211A and the second sub-diffusion region 1211B may be different.

Please refer to FIG. 5, which is a partial plan view of a first polarizing plate 120 according to another embodiment of the present invention. In this embodiment, the outer diameter D1 of the microstructure M1 formed in the first sub-light-diffusing region 1211A, the outer diameter D1 of the microstructure M1 formed in the second sub-light-expanding region 1211B, and the third sub-expansion The outer diameter D1 of the microstructure M1 in the light region 1211C is different. For example, the outer diameter D1 of the microstructure M1 formed in the second sub-light-diffusing region 1211B is formed in the first sub-light-diffusing region 1211A. The outer diameter D1 of the inner microstructure M1 is large, but is smaller than the outer diameter D1 of the microstructure M1 formed in the third sub-light-diffusing region 1211C.

In another embodiment, the outer diameter D1 of at least two microstructures M1 formed in the first sub-light-diffusing region 1211A, and the outer diameter D1 of the at least two microstructures M1 formed in the second sub-light-expanding region 1211B and/or Or the outer diameter D1 of at least the two microstructures M1 formed in the third sub-light-diffusing region 1211C may be different, but may be the same.

In terms of shape, the planar shape or cross-sectional shape of the microstructure M1 formed in the light-expanding region or the sub-light-expanding region may be circular, elliptical or lenticular. In addition, the shapes of the plurality of microstructures M1 formed in the same light-expanding region or the same sub-diffusion region may be different or the same; the shapes of the plurality of microstructures M1 formed in different light-expanding regions or different sub-light-expanding regions may be The XOR is the same.

In an embodiment, the microstructures M1 may be arranged in a staggered manner, arranged in a checkerboard pattern, or in a progressive manner that is gradually reduced from a large size. Other embodiments may be arranged in other non-uniform ways. The invention is not limited to the above embodiments, and other suitable designs can be used for actual product requirements. For example, in other embodiments, the size/shape/arrangement may be altered or integrated as appropriate to achieve the desired optical effect.

In general, the plurality of microstructures M1 formed in the same light-expanding region or the same sub-diffusion region may have different or the same size and/or shape; or the microstructures formed in a light-expanding region or a sub-light-expanding region The microstructures formed in the other light-enhancing or sub-light-emitting regions may have different or the same size and/or shape.

In terms of the distribution density of the microstructure M1, formed in different light-expanding regions Or the distribution densities of several microstructures of different sub-diffuser zones may be the same or different.

Please refer to FIG. 6 , which illustrates a partial top view of a first polarizing plate 120 in accordance with another embodiment of the present invention. The light-expanding region 1211 of this embodiment includes a plurality of sub-diffusing regions. Different from the light-expanding region 1211 of FIG. 5, the area of one region of one of the sub-light-diffusing regions of the light-expanding region 1211 of the present embodiment is different from the area of the corresponding region of the other sub-diffusing region. In the first sub-diffusing region 1211A and the second sub-diffusing region 1211B, the area of the first region 1211A1 of the first sub-diffusing region 1211A is different from the area of the first region 1211B1 of the second sub-diffusing region 1211B. different. In addition, the area of the plurality of sub-light-diffusing regions may be determined by the driving design of the liquid crystal molecules by the display panel 110, which is not limited in the embodiment of the present invention.

Although the above embodiment is described by taking one light-expanding region 1211 as an example, the other light-expanding regions 1211 have similar designs, and details are not described herein again. In addition, the design of each of the light-expanding regions 1211 and/or the respective light-expanding particle groups 1241 of the first polarizing plate 120 may be different or the same; or, the area of all the light-expanding regions 1211 of the first polarizing plate 120 and/or all The region of the region of the light-expanding particle group 1241 can be spread over the entire display surface of the display panel 110, so that the light L1 emitted from any portion of the display surface can pass through the light-expanding particle group 1241 to generate a light-expanding effect.

In summary, the polarizing plate of the embodiment of the present invention is disposed on the side of the light emitting surface of the display panel. The first protective layer of the polarizing plate has at least one light-expanding region, and a plurality of light-expanding particle groups are formed in the light-expanding regions. In an embodiment, the group of light-expanding particles may be formed in at least one of the plurality of sub-diffusion regions of the light-diffusing region. In another embodiment, the group of light-expanding particles may be formed in at least one of a plurality of regions of the sub-light-diffusing region of the light-expanding region, Such regions correspond to a plurality of driving regions of a sub-pixel region of the display panel, and/or the regions of the plurality of sub-diffusing regions may be the same or different. The plurality of microstructures in the same light-expanding region or in the same sub-diffusion region may have different or the same size and/or shape; or a microstructure of a light-expanding region or a sub-diffusing region and another light-expanding The microstructures of the regions or the other sub-light-diffusing regions may have different or the same size and/or shape; alternatively, the distribution densities of the microstructures of the different light-expanding regions or different sub-diffusing regions may be the same or different.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧ display device

110‧‧‧ display panel

110b‧‧‧Back

110u‧‧‧Glossy

111‧‧‧Photo area

112‧‧‧Color filters

113‧‧‧Liquid layer

114‧‧‧Thin film transistor layer

120‧‧‧First polarizer

121‧‧‧First protective layer

1211‧‧‧Lighting area

122‧‧‧ polarizing layer

123‧‧‧Second protective layer

124‧‧‧Enhanced layer

1241‧‧‧Enhanced particle swarm

130‧‧‧Adhesive layer

140‧‧‧Second polarizer

150‧‧‧Backlight module

D1‧‧‧ OD

H1‧‧‧ Height

L1‧‧‧Light

M1‧‧‧ microstructure

Θ‧‧‧ angle

Claims (12)

A display device includes: a display panel; and a polarizing plate disposed on a side of the light emitting surface of the display panel, the polarizing plate comprising: a first protective layer having a plurality of light-expanding regions; and a plurality of light-expanding regions a particle group, each of the light-expanding particle groups being formed in the corresponding light-expanding region; a second protective layer; and a polarizing layer formed between the first protective layer and the second protective layer. The display device of claim 1, wherein each of the light-expanding particle groups comprises a plurality of microstructures, each of the micro-structures having a size between 10 ^-6 meters and 10 ^-3 meters, and/ Or adjacent two of the microstructures are spaced between ^10-6 meters and ^10-4 meters apart. The display device of claim 2, wherein each of the microstructures has a height and an outer diameter, the height being between 10 ^-6 meters and 10 ^-3 meters, and/or each of the micro The ratio of the height of the structure to the outer diameter is between 0.1 and 1.0. The display device of claim 2, wherein each of the microstructures is formed on the first protective layer by printing, printing, yellow lithography, dropping, physical transfer or stamping, and/or Each of the microstructures is made of a transparent or translucent material The material is formed, and/or each of the microstructures is made of a UV acrylic resin, a polymer material, a ruthenium gel or a polyethylene terephthalate (PET). The display device of claim 2, wherein the top or bottom cross-sectional shape of the microstructures formed in the corresponding light-diffusing region is circular, elliptical or lenticular, and/or formed The microstructures corresponding to the light-expanding regions are arranged in a staggered pattern, a checkerboard pattern, and/or in a progressive manner that tapers from a large size. The display device according to claim 1, wherein each of the light-expanding particle groups occupies a ratio of a total area of the light-expanding region to an area of the corresponding light-expanding region between 20 and 80. The display device of claim 1, wherein the display panel comprises a plurality of pixel regions, and positions of the light-expanding regions correspond to the pixel regions. The display device of claim 7, wherein each of the light-expanding regions includes a plurality of sub-light-expanding regions, each of the pixel regions includes a plurality of sub-pixel regions, and positions of the sub-light-expanding regions respectively correspond to The sub-pixel regions of the pixel region correspond to each other. The display device of claim 8, wherein each of the light-expanding particle groups comprises a plurality of microstructures, and the microstructures are formed on at least one of the sub-light-expanding regions. The display device of claim 1, wherein each of the light-expanding regions includes a sub-diffusing region, the sub-diffusing region includes a first region and a second region, and the display panel has a sub-pixel The area includes a first driving area and a second driving area, and the driving voltage applied by the display panel in the first driving area is different from the driving voltage of the second driving area, wherein the first of the sub-light-emitting areas The region and the second region respectively correspond to the first driving region and the second driving region, and each of the light-expanding particle groups is formed in at least the first region and the second region corresponding to the sub-light-diffusing region One. The display device of claim 1, wherein each of the light-expanding particle groups comprises a plurality of microstructures, each of the light-expanding regions includes a plurality of sub-diffusing regions, and the sub-expansion is located in the same one of the light-expanding regions. The dimensions and/or shapes of the microstructures of the light regions are different or the same, and/or the microstructures and/or shapes of the microstructures of the plurality of sub-light-diffusing regions that are different from the same light-diffusing region are different. Or the same. The display device of claim 1, wherein each of the light-expanding regions includes a plurality of sub-light-diffusing regions, and the plurality of light-expanding regions of the plurality of sub-light-diffusing regions of the same light-diffusing region The density is the same or different.