CN101364007B - Display device capable of reducing visibility of scratch and manufacturing method thereof - Google Patents

Abstract

The invention discloses a display device and a manufacturing method thereof. The display device includes a light guide plate, a light source, a prism type light enhancement sheet and a reflective polarized light enhancement sheet. The first side of the light guide plate extends along the first direction, and the light source is arranged adjacent to the second side of the light guide plate, and the first side is adjacent to the second side. The prism-type brightness enhancement sheet is arranged on the light guide plate, and there are a plurality of prisms extending along the second direction on it, and the prisms rotate counterclockwise from the first direction in a direction of 0° to 90°. The reflective polarizer has a transmission axis extending along the third direction, which is also rotated counterclockwise from the first direction in a direction of 0° to 90°.

Description

Display device capable of reducing visibility of scratches and manufacturing method thereof

technical field

The present invention relates to a display device and a manufacturing method thereof; in particular, the present invention relates to a display device capable of reducing the visibility of scratches and a manufacturing method thereof.

Background technique

Liquid crystal display devices have been widely used in various electronic products such as liquid crystal televisions, computers, mobile phones and personal digital assistants (Personal Digital Assistant, PDA). Liquid crystal display devices with the advantages of lightness, lightness, power saving, low radiation, etc., have been continuously expanded in market application scope due to the size becoming larger and the product specifications getting better and better. However, since the liquid crystal material in the liquid crystal display device itself does not have luminescence, it is necessary to provide light through the backlight module to achieve the display effect, so the backlight module is actually one of the most important components in the liquid crystal display device. With the continuous expansion of differences in panel size and application levels of liquid crystal display devices, the industry trend of backlight modules can be expected to develop in the long term. In particular, in recent years, the market demand for liquid crystal display devices has grown significantly. In order to meet the functional and appearance requirements of liquid crystal display devices, the designs of backlight modules used in liquid crystal display devices are also increasingly diversified.

As shown in FIG. 1 a , a conventional liquid crystal display device includes a light guide plate 13 , a light source 15 , a prism-type brightness enhancement film 31 , a reflective polarizer-type brightness enhancement film 33 and a display panel 20 . The light source 15 is disposed corresponding to an end edge of the light guide plate 13 to incident light into the light guide plate 13 . The light passes through the light guide plate 13 and enters the prism-type brightness enhancement sheet 31 upwards. A prism 37 is formed on the prism-type brightness enhancement sheet 31 , which can recycle and reuse the incident light at a large angle, so as to achieve the effect of concentrating the light and increasing the brightness. The light then enters the reflective polarizer brightness enhancement sheet 33; the reflective polarizer brightness enhancement sheet 33 has a transmission axis 35, which allows the polarized light in the direction of the transmission axis 35 to pass through, but reflects and recycles the polarized light in the direction of the non-transmission axis 35. In the existing design, the penetration axis 35 is generally perpendicular to the direction of the prism 37 . The passing light finally enters the display panel 20 and assists in displaying images on the display panel 20 .

The luminance performance of the above-mentioned conventional liquid crystal display devices varies with changes in viewing directions and viewing angles. Wherein, the viewing angle represents the angle at which the observer deviates from the central axis of the panel. As shown in Figure 1b, in the observation direction of 30°-210° on the circumference, as the viewing angle moves from 0° in the center to 20°, 40°, 60°, etc. on both sides, the brightness of the liquid crystal display device also changes accordingly. reduce. However, in the observation direction of 120°-300° on the circumference, as shown by the solid curve in Figure 1c, as the viewing angle (horizontal axis) goes from the central 0° to the sides of 20°, 40°, 60°, 90°, etc. When moving, the luminance (vertical axis) of the liquid crystal display device first gradually decreases from 200 to about 50; but when the viewing angle exceeds 60°, the luminance first increases obviously and then decreases, and another luminance is formed when the viewing angle is about 70°. Brightness peak 90.

Due to the low hardness of the reflective polarizer 33 , scratches are often formed during production or assembly. As shown by the dotted line in Figure 1c, it shows the luminance of the light passing through the scratched part, and its distribution will gradually decrease with the increase of the viewing angle. Due to the overall luminance distribution curve shown by the solid line, the luminance peak at a large viewing angle increases significantly, so the viewing angle luminance of the scratched part shown by the dotted line will exceed. Therefore, the overall optical appearance of the scratched part is obviously inconsistent with the optical appearance of the unscratched normal part, so that the user can easily find the existence of the scratched part when observing.

Contents of the invention

The object of the present invention is to provide a display device and a manufacturing method thereof, which can reduce the visibility of scratches on a reflective polarizer.

Another object of the present invention is to provide a display device and a manufacturing method thereof, which can improve the performance of the overall image.

The display device includes a backlight module and a display panel arranged on the backlight module. The backlight module includes a light guide plate, a light source and several optical films. The light guide plate has a first side and a second side adjacent to each other; wherein the first side extends along a first direction. The light source is arranged adjacent to the second side of the light guide plate. The optical film includes a superimposed first prism-type brightness enhancement sheet and a reflective polarizer-type brightness enhancement sheet. The first prism-type brightness enhancement sheet is arranged on the light guide plate, and a plurality of prisms are arranged side by side and parallel thereon. The direction of the prism extends along the second direction, and the second direction is a first angle between 0° and 90° counterclockwise from the first direction. The reflective polarizer is arranged on the first prism-type brightness enhancement and has a transmission axis. The penetration axis extends along a third direction, and the third direction is a second angle between 0° and 90° counterclockwise from the first direction.

By combining the orientation of the prisms of the first prism-type enhancement sheet and the orientation of the transmission axis of the reflective polarizing enhancement sheet, the phenomenon of brightness enhancement at large viewing angles can be reduced. Since the luminance peak at a large viewing angle is reduced, the overall distribution curve can be closer to the distribution trend of the luminance at the viewing angle of the scratched part. In this way, the overall optical performance of the scratched part is close to that of the unscratched normal part, making it difficult for the user to find the existence of the scratched part when observing.

The manufacturing method of the display device includes the following steps: providing a light guide plate, which can be divided into a first quadrant, a second quadrant, a third quadrant and a fourth quadrant in sequence; providing a light source and making it adjacent to the third quadrant of the light guide plate and the fourth quadrant; set the first prism type light enhancement film on the light guide plate, and make the prisms on it extend along the direction of the second quadrant and the fourth quadrant; set the reflective polarizing light enhancement film on the light guide plate, and make it pass through The transmission axis extends along the direction of the second quadrant and the fourth quadrant; and the display panel is arranged on the reflective polarizer.

Description of drawings

FIG. 1a is an exploded schematic diagram of components of a conventional liquid crystal display device;

Figure 1b is a schematic diagram of the luminance distribution of a conventional liquid crystal display device;

Figure 1c is a schematic diagram of the luminance distribution of the existing liquid crystal display device in the viewing direction of 120°-300°;

FIG. 2 is an exploded schematic view of the components of the first embodiment of the display device of the present invention;

Fig. 3a is a schematic diagram of the alignment of the first prism-type brightness enhancement sheet in Fig. 2;

Figure 3b is a schematic diagram of the alignment of the reflective polarizer in Figure 2;

Figure 4a is a schematic diagram of the luminance distribution of the display device in Figure 2;

Figure 4b is a schematic diagram of the luminance distribution of the display device in Figure 2 in the viewing direction of 60°-240°;

Fig. 4c is a schematic diagram of the viewing angle luminance distribution of the scratched part of the display device;

5a is a schematic cross-sectional view of a second embodiment of the display device of the present invention;

Fig. 5b is a schematic diagram of the luminance distribution of the display device shown in Fig. 5a;

Fig. 5c is a schematic diagram of the luminance distribution of the display device shown in Fig. 5a in the viewing direction of 60°-240°;

6 is a schematic cross-sectional view of a third embodiment of the display device of the present invention;

7 is a schematic cross-sectional view of a fourth embodiment of the display device of the present invention;

FIG. 8a is an exploded schematic diagram of components of a fifth embodiment of the display device of the present invention;

Fig. 8b is a schematic cross-sectional view of the display device shown in Fig. 8a;

9 is a flowchart of a manufacturing method of a display device of the present invention;

FIG. 10 is an exploded schematic view of the components of the display device of the present invention.

[Description of main component symbols]

100 backlight modules

111 system housing

130 light guide plate

131 first side

132 second side

150 light source

170 optical film

200 display panels

201 upper substrate

203 lower substrate

210 display surface

310 first prism type brightness enhancement film

311 prism

320 second prism type brightness enhancement film

321 prism

330 reflective polarizing film

331 penetrating shaft

333 surface layer

335 optical layers

Polarizing film under 350

351 Protruding Structures

Polarizing film on 370

390 diffusion film

510 First Direction

520 Second Direction

530 third direction

700 prism type brightness enhancement film

710 Prisms

750 direct type backlight

755 LEDs

Detailed ways

The invention provides a display device. In a preferred embodiment, the display device of the present invention is a liquid crystal display device, including household liquid crystal televisions, liquid crystal monitors of personal computers and laptop computers, liquid crystal displays of mobile phones and digital cameras, and other electronic products. liquid crystal display device.

In the embodiment shown in FIG. 2 , the display device includes a backlight module 100 and a display panel 200 . The display panel 200 is disposed on the backlight module 100 , and its back surface corresponds to the light emitting surface of the backlight module 100 . The backlight module 100 outputs light from the light emitting surface into the display panel 200 to assist the display surface 210 of the display panel 200 to display images.

As shown in FIG. 2 , the backlight module 100 includes a light guide plate 130 , a light source 150 and a plurality of optical films 170 . The light guide plate 130 can be a rectangle or an irregular polygon, and has adjacent first sides 131 and second sides 132 . The first side 131 extends along the first direction 510, and the second side 132 can be perpendicular to the first side 131, or can form a specific angle with the first side 131, or can meet the first side 131 through a hypotenuse . In this embodiment, the first side 131 is the short side of the rectangular light guide plate 130 , and the second side 132 is the long side of the rectangular light guide plate 130 ; however, in different embodiments, the opposite or other settings can also be made. The light source 150 is disposed adjacent to the second side 132 of the light guide plate 130 and may be parallel to the second side 132 of the light guide plate 130 . The above-mentioned light source 150 is disposed adjacent to the second side 132 of the light guide plate 130 , and does not specifically mean that the light source 150 needs to be fixed on the light guide plate 130 . The light source 150 can also be fixed on the system case or other circuit boards, while maintaining a proper distance from the second side 132 of the light guide plate 130 , only the light emitting part of the light source 150 faces the second side 132 of the light guide plate 130 .

In a preferred embodiment, the light source 150 is a tube-type light source and extends along the second side 132; however, in different embodiments, the light source 150 can also be a light strip formed by a plurality of LEDs arranged in a straight line or in a staggered manner. bar), at this time, a plurality of LEDs are distributed along the second side 132 . The light source 150 emits light toward the light guide plate 130 , and the light mainly enters the light guide plate 130 from the second side 132 of the light guide plate 130 along the first direction 510 . After the light from the light source 150 enters the light guide plate 130 , it passes through the internal optical reflection and refraction effects of the light guide plate 130 , is transmitted and distributed to various parts of the light guide plate 130 , and is output from the light-emitting surface of the light guide plate 130 to the optical film 170 .

In the embodiment shown in FIG. 2 , the optical film 170 includes a stacked first prism-type brightness enhancement film 310 and a reflective polarizer-type brightness enhancement film 330 . The first prism-type brightness enhancement sheet 310 is disposed on the light guide plate 130 and has a plurality of prisms 311 arranged side by side in parallel. The prism 311 can be a light-transmitting triangular prism, and is disposed flat on the main body of the first prism-type enhancement sheet 310; however, in different embodiments, the prism 311 can also be a trapezoidal prism or a lens column with other cross-sections. With the arrangement of the prisms 311 , the first prism-type brightness enhancement sheet 310 can recycle and reuse the incident light from the light guide plate 130 at a large angle, so as to increase light utilization efficiency. As shown in FIG. 3 a , the orientation of the prism 311 extends along the second direction 520 , and the second direction 520 is rotated counterclockwise from the first direction 510 by a first angle θ ₁ . The range of the first angle _θ1 can be between 0° and 90°; in other words, if the second side 132 of the light guide plate 130 is used as the X axis, and the first side 131 is used as the Y axis, then the direction of the prism 311 has a negative direction. slope, and extend along the second quadrant-fourth quadrant. However, in a preferred embodiment, the range of the first angle _θ1 can be further limited between 34° and 67°, as shown in FIG. 10 .

As shown in FIG. 2 , the reflective polarizing enhancement sheet 330 is disposed on the first prism-type enhancement sheet 310 and has a transmission axis 331 . Through the design of the transmission axis 331, the reflective polarizing enhancement film 330 allows the polarized light in the direction of the transmission axis 331 to pass through, and reflects the polarized light in the direction of the non-transmission axis 331 back to the first prism type enhancement film 310 and the light guide plate 130 and then reuse. As shown in FIG. 3 b , the penetration shaft 331 extends along a third direction 530 , and the third direction 530 is rotated counterclockwise from the first direction 510 by a second angle θ ₂ . The range of the second angle _θ2 can be between 0° and 90°; in other words, if the second side 132 of the light guide plate 130 is used as the X axis, and the first side 131 is used as the Y axis, then the direction of the penetration axis 331 has Negative slope, and extending along the direction from the second quadrant to the fourth quadrant, as shown in Figure 10. However, in a preferred embodiment, the range of the second angle _θ2 can be further limited between 43° and 47°. In addition, the range of the included angle _θ3 between the second direction 520 and the third direction 530 may be between 0° and 42°.

By combining the orientation of the prism 311 of the first prism-type enhancement sheet 310 and the orientation of the transmission axis 331 of the reflective polarizer enhancement sheet 330 , the phenomenon of brightness enhancement at a large viewing angle can be reduced. As shown in Figure 4a, when observing at a large viewing angle greater than 60° (the outermost circle), the luminance enhancement phenomenon in the viewing direction of 60°-240° has been significantly reduced and moderated. As shown in Fig. 4b, by observing the luminance line in the viewing direction of 60°-240°, it can be found that the peak luminance at a large viewing angle greater than 60° has been significantly lower than that of the conventional backlight module. Since the luminance peak at large viewing angles decreases, the overall distribution curve is closer to the luminance distribution trend of the viewing angle of the scratched part shown by the dotted line in FIG. 4c. In this way, the overall optical performance of the scratched part is closer to the optical performance of the unscratched normal part, making it difficult for the user to find the existence of the scratched part when observing.

In the embodiment shown in FIG. 5 a , the display device includes a lower polarizing film 350 disposed on the reflective polarizer 330 . The lower polarizing film 350 can be disposed on the bottom surface of the lower substrate 203 of the display panel 200 to polarize the light output from the backlight module 100 . The lower polarizing film 350 has a polarization axis, which can be parallel to the transmission axis 331 of the reflective polarizer 330 . As shown in FIG. 5 a , the side of the lower polarizing film 350 facing the reflective polarizer 330 has a plurality of protruding structures 351 . The protruding structure 351 is in contact with the surface of the reflective polarizer 330 , and the hardness of the protruding structure 351 is greater than the surface hardness of the reflective polarizer 330 .

As shown in FIG. 5 a , the reflective polarizer 330 preferably has two surface layers 333 and multiple optical layers 335 . The surface layer 333 generally has a relatively smooth surface, and may have a certain degree of haze depending on design requirements. The optical layer 335 is interposed between the surface layers 333 and is protected by the surface layer 333 . According to the pencil experiment, the hardness of the surface layer 333 is suggested to be close to 4B, and the hardness of the protrusion structure 351 of the lower polarizing film 350 is suggested to be close to about 3H. Therefore, when the protruding structure 351 is in contact with the surface layer 333 , it is easy to cause scratches on the surface layer 333 . However, by coordinating the orientation of the prism 311 of the first prism-type enhancement sheet 310 and the orientation of the transmission axis 331 of the reflective polarization enhancement sheet 330 , the possibility of the scratched portion being observed at a large viewing angle can be reduced.

Adding the lower polarizing film 350 can further change the optical properties of the display device. As shown in FIG. 5b, when observing at a large viewing angle greater than 60° (the outermost circle portion), the luminance enhancement phenomenon in the viewing direction of 60°-240° tends to disappear. As shown in Figure 5c, taking the luminance line in the viewing direction of 60°-240° to observe, it can be found that the luminance peak at the large viewing angle of 60° to 90° has also been smoothed, making the traces of the scratched part It is not easy to be found when observing from a large viewing angle.

In the embodiment shown in FIG. 6 , the display device also includes a second prism type enhancement sheet 320 . The second prism-type brightness enhancement sheet 320 is disposed between the first prism-type brightness enhancement sheet 310 and the light guide plate 130 . In a preferred embodiment, the second prism-type brightness enhancement sheet 320 has a plurality of prisms 321 arranged in parallel. The prism 321 can be a light-transmitting triangular prism, and is disposed flat on the main body of the second prism-type enhancement sheet 320 ; however, in different embodiments, the prism 321 can also be a trapezoidal prism or a lens column with other cross-sections. With the arrangement of the prisms 321 , the second prism-type brightness enhancement sheet 320 can recycle and reuse the incident light from the light guide plate 130 at a large angle, so as to increase light utilization efficiency. The prisms 321 on the second prism-type enhancement sheet 320 can be perpendicular to the prisms 311 on the first prism-type enhancement sheet 310 to correspond to incident light from different directions.

In the embodiment shown in FIG. 7 , the display device also includes an upper polarizing film 370 and a diffusion film 390 . The upper polarizing film 370 is disposed on the surface of the upper substrate 201 of the display panel 200 ; in other words, the display panel 200 is sandwiched between the upper polarizing film 370 and the lower polarizing film 350 . The diffusion film 390 is disposed between the light guide plate 130 and the first prism-type enhancement sheet 310 or the second prism-type enhancement sheet 320 . As shown in FIG. 7 , the diffusion film 390 may be disposed on the light guide plate 130 and located below the second prism-type brightness enhancement sheet 320 . However, in different embodiments, only the diffusion film 390 may be provided without the second prism-type brightness enhancement film 320 .

8a and 8b show another embodiment of the display device. As shown in FIG. 8 a and FIG. 8 b , the display device includes a prism-type brightness enhancement film 700 , a reflective polarization enhancement film 330 , a lower polarizer film 350 and a display panel 200 . The prism-type brightness enhancement sheet 700 has a plurality of prisms 710 arranged in parallel. The prism 710 can be a light-transmitting triangular prism, the distance between its axes can range between 40 micrometers (μm) and 50 micrometers (μm), and the angle of the top angle of the section can be 90°; however, in different embodiments Among them, the prism 710 can also be a trapezoidal column or a light-transmitting column of other shapes. The reflective polarization enhancement film 330 is disposed on the prism type enhancement film 700 and has a transmission axis 331 . Through the design of the transmission axis 331 , the reflective polarizer 330 can allow the polarized light in the direction of the transmission axis 331 to pass through, and reflect the polarized light in the direction of the non-transmission axis 331 back to the backlight module for reuse. There is an angle α between the direction of the prism 710 and the direction of the penetration axis 331 , and the range of the angle α is between 0° and 42°. However, in a preferred embodiment, the included angle α can be further limited between 12° and 22°.

As shown in FIG. 8 b , the lower polarizing film 350 is disposed on the reflective polarizer 330 , and the display panel 200 is disposed on the lower polarizing film 350 . In a preferred embodiment, the lower polarizer film 350 is formed on the bottom surface of the lower substrate 203 of the display panel 200 and corresponds to the reflective polarizer 330 . The lower polarizing film 350 has a polarization axis, and the direction of the polarization axis can be parallel to the direction of the transmission axis 331 of the reflective polarizer 330 . The lower polarizing film 350 has a plurality of protruding structures 351 on a side facing the reflective polarizer 330 . The protruding structure 351 is in contact with the surface of the reflective polarizer 330 , and the hardness of the protruding structure 351 is greater than the surface hardness of the reflective polarizer 330 . In addition, in this embodiment, the display device includes a direct-type backlight 750 formed by LEDs 755; however, in different embodiments, a direct-type backlight or an edge-type backlight formed by lamp tubes can also be used instead.

FIG. 9 is a flow chart of an embodiment of a method for manufacturing a display device of the present invention. Step 910 includes providing a light guide plate. As shown in FIG. 10 , the light guide plate can be sequentially divided into a first quadrant I, a second quadrant II, a third quadrant III, and a fourth quadrant IV. From the perspective of FIG. 10 , the right side of the long side of the light guide plate 130 is the positive direction of the X-axis, and the far side of the short side is the positive direction of the Y-axis. The upper right corner is the first quadrant I, the upper left corner is the second quadrant II, the lower left corner is the third quadrant III, and the lower right corner is the fourth quadrant IV. The first quadrant I, the second quadrant II, the third quadrant III, and the fourth quadrant IV above represent the blocks on the light guide plate 130 , but do not represent any physical division or partition structure.

Step 930 includes providing the light source 150 adjacent to the third quadrant III and the fourth quadrant IV of the light guide plate 130 . As shown in FIG. 10 , the light source 150 is disposed corresponding to the bottom of the light guide plate 130 and parallel to the X-axis direction. Therefore, one end of the light source 150 corresponds to the third quadrant III, and the other end corresponds to the fourth quadrant IV. The above-mentioned light source 150 is adjacent to the third quadrant III and the fourth quadrant IV of the light guide plate 130 , and it is not limited that the light source 150 needs to be fixed on the light guide plate 130 . The light source 150 can also be fixed on the system housing 111 or other circuit boards, and maintain an appropriate distance from the second side 132 of the light guide plate 130, and only need to direct the light-emitting part toward the third quadrant III and the fourth quadrant of the light guide plate 130 IV will do.

Step 950 includes disposing the first prismatic enhancement sheet 310 on the light guide plate 130 . As shown in FIG. 10 , the first prism type enhancement sheet 310 has a plurality of prisms 311 , and the prisms 311 extend along the directions of the second quadrant II and the fourth quadrant IV. In other words, the slope of the prism 311 in this coordinate system is negative. Step 970 includes disposing the reflective polarizer 330 on the light guide plate 130 . As shown in FIG. 10 , the reflective polarizer 330 has a transmission axis 331 , and the transmission axis 331 extends along the directions of the second quadrant II and the fourth quadrant IV. In other words, the slope of the penetration axis 331 in this coordinate system is a negative value. In a preferred embodiment, in this step, the angle α between the penetration axis 331 and the direction of the prism 311 can be further set to be between 0° and 42°.

Step 990 includes disposing the display panel 200 on the reflective polarizer 330 . By coordinating the orientation of the prism 311 of the first prism-type enhancement sheet 310 and the orientation of the transmission axis 331 of the reflective polarization enhancement sheet 330 , the possibility of scratches being observed at a large viewing angle can be reduced. In addition, in different embodiments, a second prism-type brightness enhancement sheet 320 can also be added between the first prism-type brightness enhancement sheet 310 and the light guide plate 130, as shown in FIG. 6 or FIG. 7 ; or a lower polarizing film 350 can be added. Between the reflective polarizer 330 and the display panel 200 , as shown in FIG. 5 a , FIG. 6 , FIG. 7 or FIG. 8 b . With different optical film settings, it can be adjusted to produce optical characteristics that meet product requirements.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make various corresponding modifications according to the present invention without departing from the spirit and essence of the present invention. Changes and deformations, but these corresponding changes and deformations should fall within the scope of protection of the appended claims of the present invention.

Claims (12)

1. A display device, characterized in that it comprises: A light guide plate has a first side and a second side adjacent to each other, and the first side extends along a first direction; a light source, disposed adjacent to the second side, and capable of emitting light incident on the second side along the first direction; A first prism-type brightness enhancement sheet is arranged on the light guide plate, the first prism-type brightness enhancement sheet has a plurality of prisms extending along a second direction, and the second direction rotates counterclockwise from the first direction by a first angle , the range of the first angle is between 0° and 90°; and A reflective polarizer, which is arranged on the first prism-type brightness enhancement. The reflective polarizer has a transmission axis, and the transmission axis extends along a third direction, and the third direction is opposite from the first direction. the hour hand rotates a second angle, and the range of the second angle is between 0° and 90°; The lower polarizing film is arranged on the reflective polarizing film, and the lower polarizing film has a plurality of protruding structures on the side facing the reflective polarizing film, and these protruding structures are in contact with the surface of the reflective polarizing film; and A display panel, arranged on the lower polarizing film; Wherein, there is an included angle between the second direction and the third direction, and the range of the included angle is between 12° and 42°. 2. The display device as claimed in claim 1, wherein the hardness of the protruding structures is greater than the surface hardness of the reflective polarizer. 3. The display device according to claim 1, further comprising an upper polarizing film disposed on the display panel, and the display panel is sandwiched between the upper polarizing film and the lower polarizing film. 4. The display device according to claim 1, further comprising a second prism-type brightness enhancement sheet disposed between the first prism-type brightness enhancement sheet and the light guide plate. 5 . The display device as claimed in claim 1 , comprising a diffusion film disposed between the first prism-type brightness enhancement sheet and the light guide plate. 6. The display device as claimed in claim 1, wherein the range of the first angle is between 34° and 67°. 7. The display device as claimed in claim 1, wherein the second angle ranges between 43° and 47°. 8 . The display device according to claim 1 , wherein the reflective polarizer further comprises a plurality of optical layers and two surface layers, and the optical layers are sandwiched between the two surface layers. 9. A display device, characterized in that it comprises: A prismatic enhancement sheet having a plurality of prisms; and A reflective polarized light enhancement film is arranged on the prism type light enhancement film. The reflective polarized light enhancement film has a transmission axis, and there is an included angle between the direction of the prisms and the direction of the transmission axis, and the included angle ranges between 12° and 42°; The lower polarizing film is arranged on the reflective polarizing film, and the lower polarizing film has a plurality of protruding structures on the side facing the reflective polarizing film, and these protruding structures are in contact with the surface of the reflective polarizing film, and the The hardness of the protrusion structure is greater than the surface hardness of the reflective polarizer; and A display panel is arranged on the lower polarizing film. 10. The display device as claimed in claim 9, wherein the range of the included angle is between 12° and 22°. 11. A method of manufacturing a display device, comprising the following steps: A light guide plate is provided, which can be divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant in a counterclockwise direction; providing a light source adjacent to the third quadrant and the fourth quadrant; A first prism-type brightness enhancement sheet is disposed on the light guide plate, the first prism-type brightness enhancement sheet has a plurality of prisms, and the prisms extend along the direction of the second quadrant and the fourth quadrant; A reflective polarizer is arranged on the first prism-type brightness enhancement, the reflective polarizer has a transmission axis, and the transmission axis extends along the direction of the second quadrant and the fourth quadrant; Setting a lower polarizing film on the reflective polarizer, the lower polarizing film has a plurality of protruding structures on the side facing the reflective polarizing film, and these protruding structures are in contact with the surface of the reflective polarizing film; and setting a display panel on the lower polarizing film; Wherein, there is an included angle between the direction of the prisms and the direction of the penetration axis, and the range of the included angle is between 12° and 42°. 12. The manufacturing method according to claim 11, wherein the range of the included angle is between 12° and 22°.

Images