TW202206908A - Display device - Google Patents

Abstract

A display device including a liquid crystal module and a backlight module is provided. The liquid crystal module includes a dual-domains liquid crystal layer, a lower polarizer and an upper polarizer. The lower polarizer has a transmission axis along a first direction. The backlight module includes a light emitting module, a first prism sheet, a second prism sheet, a reflective-polarizing film and a light expanding film. The reflective-polarizing film has a transmission axis along a third direction, wherein an angle between the third direction and the first direction falls within a range of 0±5 degrees. The light expanding film has a plurality of first microstructures extending along a first extension direction. A light emitted by the light emitting module is emitted through a light emitting surface of an optical plate, and then sequentially passes through the first prism sheet, the second prism sheet, the reflective-polarizing film, the light expanding film and the liquid crystal module to form an image light.

Description

display device

The present invention relates to an optical module, and particularly to a display device.

Due to the development of electronic products such as televisions, computers, notebook computers, mobile devices, and smart phones, the improvement of the user experience of display devices has become a trend in the market. Existing display devices, for example, use a multi-domain vertical alignment (VA) liquid crystal layer to improve the color washout of a display image displayed by the display device at a large viewing angle. In addition, in order to improve the problem of poor gamma (Gamma) value of the display image at a large viewing angle, the display device can use a multi-domain in-plane-switching (In-Plane-Switching, IPS) liquid crystal layer, or the display device can be used in multiple A microstructure film is arranged on the domain vertical alignment liquid crystal layer.

However, the cost of arranging the microstructure film is relatively high, which increases the overall cost of the display device and causes the display device to have poor contrast ratio. Furthermore, although the number of domains of the liquid crystal layer is higher, the color shift problem of the display image can be reduced, but the light energy utilization rate of the display device is also poor, resulting in poor brightness of the display image. On the contrary, for a display device with a small number of areas of the liquid crystal layer, such as a dual-domain liquid crystal layer, the display device also has the problem of asymmetry in the light shape of the surface light source provided by the backlight module of the display device due to the matching method of each film layer. , and there is also the problem of large viewing angle light leakage at the vertical viewing angle and the horizontal viewing angle at the lowest gray scale.

The present invention provides a display device, which can effectively reduce the problem of light shape asymmetry of a surface light source and the problem of light leakage from a large viewing angle when a display image presented by the display device is at the lowest gray scale.

A display device according to an embodiment of the present invention includes a liquid crystal module and a backlight module. The liquid crystal module includes a dual-domain liquid crystal layer, a lower polarizer and an upper polarizer. The liquid crystal molecules of the dual-domain liquid crystal layer are aligned along a horizontal alignment direction when no voltage is applied. The lower polarizer has a transmission axis along a first direction, wherein the angle between the first direction and the horizontal arrangement direction is in the range of 45±5 degrees. The upper polarizer has a transmission axis along a second direction. The lower polarizer, the dual-domain liquid crystal layer and the upper polarizer are sequentially arranged in an arrangement direction. The backlight module is used to provide a light source on one side. The backlight module includes a light emitting module, a first iris sheet, a second iris sheet, a reflective polarizing film and a light-diffusing film. The light emitting module includes an optical plate and a light source. The optical plate has a light exit surface and a light entrance surface. The light source is arranged on one side of the light incident surface of the optical plate. The reflective polarizing film has a transmission axis along a third direction, wherein the included angle between the third direction and the first direction is in the range of 0±5 degrees. The light diffusing film has a plurality of first microstructures extending along a first extending direction. The light-emitting module, the first wafer, the second wafer, the reflective polarizing film, the light-diffusing film and the liquid crystal module are arranged in sequence in the arrangement direction. The light emitted by the light-emitting module exits through the light-emitting surface of the optical plate, and then passes through the first iris sheet, the second iris sheet, the reflective polarizing film, the light-diffusing film and the liquid crystal module in sequence to form an image Light.

Based on the above, in the display device according to an embodiment of the present invention, since the light-diffusing film is provided on the reflective polarizing film, and the matching of each film layer in the display device, the backlight module of the display device provides The light shape of the surface light source is better, and the display effect of the display device is better.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals are used in the drawings and description to refer to the same or like parts.

It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to a physical and/or electrical connection. Furthermore, "electrically connected" or "coupled" may refer to the existence of other elements between the two elements.

As used herein, "about," "approximately," or "substantially" includes the stated value and the average within an acceptable deviation from the particular value as determined by one of ordinary skill in the art, given the measurement in question and the A specific amount of measurement-related error (ie, the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately" or "substantially" may be used to select a more acceptable range of deviation or standard deviation depending on optical properties, etching properties or other properties, and not one standard deviation may apply to all properties. .

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be construed as having meanings consistent with their meanings in the context of the related art and the present invention, and are not to be construed as idealized or excessive Formal meaning, unless expressly defined as such herein.

FIG. 1 is an exploded perspective view of a display device according to an embodiment of the present invention. Please refer to FIG. 1 , a display device 10 according to an embodiment of the present invention includes a liquid crystal module 100 and a backlight module 200 . The liquid crystal module 100 includes a two-domain liquid crystal layer 110 , a lower polarizer 120 and an upper polarizer 130 . The lower polarizer 120 , the dual-domain liquid crystal layer 110 and the upper polarizer 130 are sequentially arranged in an arrangement direction A. The backlight module 200 includes a light emitting module 210 , a first lens 220 , a second lens 230 , a reflective polarizing film 240 and a light diffusing film 250 . The light emitting module 210 , the first wafer 220 , the second wafer 230 , the reflective polarizing film 240 , the light diffusing film 250 and the liquid crystal module 100 are sequentially arranged in the arrangement direction A.

Specifically, the liquid crystal molecules of the dual-domain liquid crystal layer 110 in this embodiment are aligned along a horizontal alignment direction H when no voltage is applied. The lower polarizer 120 has a transmission axis along a first direction D1, wherein the angle between the first direction D1 and the horizontal arrangement direction H is within a range of 45±5 degrees. The upper polarizer 130 has a transmission axis along a second direction D2, wherein the angle between the second direction D2 of the upper polarizer 130 and the first direction D1 of the lower polarizer 120 is within a range of 90±5 degrees. In one embodiment, the second direction D2 and the first direction D1 are preferably perpendicular to each other.

In this embodiment, the backlight module 200 is used to provide a surface light source. Specifically, the backlight module 200 shows that the light module 210 includes an optical plate 212 and a light source 214 . The optical plate 212 has a light exit surface 212S1 and a light entrance surface 212S2. The light source 214 is disposed on one side of the light incident surface 212S2 of the optical plate 212 . Furthermore, the light source 214 is, for example, a light-emitting diode (LED) light source, a sub-millimeter light-emitting diode (mini LED) light source, or other suitable light sources. The light emitted by the light emitting module 210 is emitted through the light emitting surface 212S1 of the optical plate 212, and then sequentially passes through the first wafer 220, the second wafer 230, the reflective polarizing film 240, the diffuser film 250 and the liquid crystal. The module 100 is used to form an image light. FIG. 1 illustrates that the light exit surface 212S1 of the optical plate 212 is adjacent to the light entrance surface 212S2. That is to say, the optical plate 212 of FIG. 1 can be a light guide plate, but the present invention is not limited thereto. In one embodiment, the optical plate can be a diffuser plate, and the light exit surface is opposite to the light entrance surface. That is, the light source is arranged below the optical plate. In the display device 10 according to an embodiment of the present invention, when the optical plate 212 is a light guide plate, the overall volume of the display device 10 is relatively small; when the optical plate is a diffuser plate, since the light source is arranged below the optical plate, the backlight mold The light shape of the group can be adjusted by the position of the light source, so the light shape of the backlight module is relatively uniform.

In one embodiment, the backlight module 200 further includes a quantum dots layer 260 disposed on the optical plate 212 , and the light source 214 includes a blue light source. The quantum dot layer 260 is disposed between the optical plate 212 and the first wafer 220 . In another embodiment, the quantum dot layer 260 may be directly disposed on the light exit surface 212S1 of the optical plate 212 . In the display device 10 according to an embodiment of the present invention, since the backlight module 200 includes the quantum dot layer 260 , the color rendering of the surface light source provided by the backlight module 200 is better.

In this embodiment, the reflective polarizing film 240 has a transmission axis along a third direction D3, wherein the angle between the third direction D3 and the first direction D1 is within a range of 0±5 degrees. In one embodiment, the third direction D3 and the first direction D1 are preferably parallel to each other.

2 is a cross-sectional view of a light diffusing film of a display device according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 simultaneously. In this embodiment, the light diffusing film 250 has a plurality of first microstructures 252 extending along a first extending direction E1. Specifically, the light diffusing film 250 includes a substrate 254, and the first microstructures 252 are disposed on the upper surface 254S of the substrate 254 opposite to the optical plate 212, but the invention is not limited thereto. Furthermore, the first microstructure 252 has a plurality of first turning regions 252F. The first inflection area 252F is the height difference L' of the first microstructure 252 along the arrangement direction A between each local extrema relative to the surface 252S of the optical plate 212 and its adjacent local extrema. An area in the range of 0 to 10%, where the height is the distance between the surface 252S of the first microstructure 252 and the upper surface 254S of the substrate 254 . The extension direction of the first inflection region 252F is perpendicular to the arrangement direction of the first microstructures 252 . Incidentally, in the first inflection area 252F1 in FIG. 2 , the first inflection area 252F1 includes local extrema LM2 , LM3 , and LM4 . The first turning region of the local extremum LM2 is a region where the height difference between the local extremums LM1 and LM3 adjacent thereto falls within the range of 0 to 10%. Similarly, the first turning area of the local extreme value LM3 is the area where the height difference between its adjacent local extreme values LM2 and LM4 falls within the range of 0 to 10%, and the first turning area of the local extreme value LM4 is the region where the height difference between its adjacent local extrema LM3 and LM5 falls within the range of 0 to 10%. Therefore, for the convenience of illustration, the first inflection area 252F1 in FIG. 2 includes the aforementioned three first inflection areas of the local extreme values LM2, LM3, and LM4.

In this embodiment, the ratio of the projected area of the first turning region 252F on the upper surface 254S of the light diffusing film 250 relative to the upper surface 254S of the optical plate 212 to the projected area of the first microstructures 252 on the upper surface 254S of the light diffusing film 250 is greater than or equal to 30% and less than or equal to 60%.

FIG. 3 is a graph showing the luminance gain ratio of the display device according to an embodiment of the present invention with respect to the average height L/average pitch P between the first microstructures. Please refer to FIG. 2 and FIG. 3 at the same time. In this embodiment, the first microstructures 252 of the light diffusing film 250 also satisfy the following conditions: 4%≦L/P≦25%, where L is the average of the first microstructures 252 height difference, and P is the average pitch of the first microstructures 252 . Figure 3 illustrates that different L/Ps produce different luminance gain ratios. In a preferred embodiment, L/P=4%.

4 is a cross-sectional view of an upper polarizer of a display device according to an embodiment of the present invention. 1 and FIG. 4, in this embodiment, the upper polarizer 130 has a plurality of second microstructures 132 along a second extending direction E2, wherein the second extending direction E2 and the horizontal arrangement direction H between The included angle is less than or equal to 20 degrees. Specifically, the upper polarizer 130 includes a substrate 134 , and the second microstructures 132 are disposed on the upper surface 134S of the substrate 134 opposite to the optical plate 212 , but the invention is not limited thereto. Furthermore, the second microstructure 132 has a plurality of second turning regions 132F. The second inflection area 132F is the height difference L′ of the second microstructure 132 along the arrangement direction A between each local extrema relative to the surface 132S of the optical plate 212 and its adjacent local extrema. An area in the range of 0 to 10%, where the height is the distance between the surface 132S of the second microstructure 132 and the upper surface 134S of the substrate 134 . The extending direction of the second inflection region 132F is perpendicular to the arrangement direction of the second microstructures 132 .

In this embodiment, the ratio of the projected area of the second turning region 132F on the upper polarizer 130 relative to the upper surface 134S of the optical plate 212 to the projected area of the second microstructures 132 on the upper surface 134S of the upper polarizer 130 is greater than or equal to 85% and less than or equal to 93%.

FIG. 5A is a graph showing a gamma value versus gray scale in a vertical viewing angle direction in which the upper polarizer is not provided with the second microstructure in a display device according to an embodiment of the present invention. FIG. 5B is a graph showing the gamma value versus gray scale in the vertical viewing angle direction of the second microstructure disposed on the upper polarizer in the display device according to an embodiment of the present invention. Please refer to FIG. 5A and FIG. 5B. In FIG. 5A, curves C1, C3, and C5 are graphs of gamma values with respect to gray scales with viewing angles of 30, 45, and 60 degrees in the vertical viewing angle direction, respectively; in FIG. 5B Among them, the curves C2, C4, and C6 are graphs of gamma values versus gray scales with viewing angles of 30, 45, and 60 degrees in the vertical viewing angle direction, respectively. Among them, the average gamma value of curve C1 is about 1.2, and the average gamma value of curve C2 is about 1.3; the average gamma value of curve C3 is about 0.5, and the average gamma value of curve C4 is about 0.8; curve C5 The average gamma value of is about -0.1, and the average gamma value of curve C6 is about 0.5. That is to say, when the second microstructure 132 is disposed on the upper polarizer 130 of the display device 10 according to an embodiment of the present invention, the overall gamma value of the display device 10 is better, and the second microstructure 132 has a better gamma value. The arrangement also overcomes the problem of grayscale inversion of the display device at large viewing angles in the vertical viewing direction.

FIG. 6A is a cross-sectional view of a first iris sheet or a second iris sheet of a display device according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 6A at the same time. In FIG. 1 , in order to clearly present the structures of the first and second ion microstructures 222 and 232 , FIG. The second zirconium microstructure 232 . In the present embodiment, the first wafer 220 has a plurality of first wafer microstructures 222 extending along a third extension direction E3, wherein the angle between the third extension direction E3 and the first direction D1 is 90± within 20 degrees. The second hexagonal sheet 230 has a plurality of second hexagonal microstructures 232 extending along a fourth extending direction E4, wherein the included angle between the fourth extending direction E4 and the first direction D1 is less than or equal to 20 degrees. In one embodiment, the third extending direction E3 and the fourth extending direction E4 are preferably perpendicular to each other.

In this embodiment, the included angle between the first extending direction E1 of the light diffusing film 250 and the fourth extending direction E4 of the second wafer 230 is within a range of 45±10 degrees.

Specifically, the first wafer 220 in this embodiment includes a substrate 224, and the first wafer microstructure 222 is disposed on the upper surface 224S1 of the substrate 224 opposite to the optical plate 212, but the invention is not limited thereto. Furthermore, the first zirconium microstructure 222 has a plurality of third turning regions 222F. The third inflection area 222F is the height difference L along the arrangement direction A between each local extrema relative to the surface 222S of the optical plate 212 and its adjacent local extrema of the first zirconium microstructure 222 'A region falling within the range of 0 to 10%, where the height is the distance between the surface 222S of the first zirconium microstructure 222 and the upper surface 224S1 of the substrate 224. The extension direction of the third inflection region 222F is perpendicular to the arrangement direction of the first zirconium microstructures 222 .

In the present embodiment, the projected area of the third turning area 222F on the upper surface 224S1 of the optical plate 212 and the projected area of the first microstructure 222 on the upper surface 224S1 of the first iris sheet 220 The ratio is greater than or equal to 21% and less than or equal to 25%.

Similarly, the second silicon wafer 230 in this embodiment includes a substrate 234, and the second silicon microstructure 232 is disposed on the upper surface 234S1 of the substrate 234 opposite to the optical plate 212, but the invention is not limited thereto. Furthermore, the second zirconium microstructure 232 has a plurality of fourth turning regions 232F. The fourth inflection area 232F is the height difference L along the arrangement direction A between each local extrema of the second vertical microstructure 232 relative to the surface 232S of the optical plate 212 and its adjacent local extrema 'A region falling within the range of 0 to 10%, where the height is the distance between the surface 232S of the second zirconium microstructure 232 and the upper surface 234S1 of the substrate 234. The extending direction of the fourth turning region 232F is perpendicular to the direction of the arrangement of the second zirconium microstructures 232 .

In the present embodiment, the projected area of the fourth turning area 232F on the second iris sheet 230 relative to the upper surface 234S1 of the optical plate 212 and the projected area of the second iris microstructure 232 on the upper surface 234S1 of the second iris sheet 230 The ratio is greater than or equal to 21% and less than or equal to 25%.

FIG. 6B is a partial enlarged view of the microstructure of the first ion or the microstructure of the second ion of FIG. 6A . Referring to FIG. 6B , in the present embodiment, the top tips 222T and 232T relative to the optical plate 212 may be rounded at the first and second top microstructures 222 and 232 . Furthermore, the radius of curvature R2 of the tip 232T of each of the second microstructures 232 is less than or equal to the radius of curvature R1 of the tip 232T of each of the first microstructures 222 .

7 is a display device according to an embodiment of the present invention, the radius of curvature of the tip of the first microstructure of the first wafer is larger and smaller than the radius of curvature of the second microstructure of the second wafer A graph of the relative luminance value of the tip's radius of curvature at the lowest gray level and the horizontal viewing angle direction versus viewing angle. The curve C7 in FIG. 7 shows that the radius of curvature R1 of the tip 222T of the first microstructure 222 is smaller than the radius of curvature R2 of the tip 232T of the second microstructure 232 , wherein R1 is 0.5 μm, and R2 is 7 microns; curve C8 is that the radius of curvature R1 of the tip 222T of the first microstructure 222 is greater than the radius of curvature R2 of the tip 232T of the second microstructure 232, wherein R1 is 7 microns, and R2 is 0.5 microns. Referring to FIG. 7 , in the display device 10 according to an embodiment of the present invention, when the radius of curvature R2 of the tip 232T of the second microstructure 232 is less than or equal to the radius of the tip 232T of the tip 232T of the first microstructure 222 When the curvature radius is R1, the problem of light leakage at a large viewing angle of the display device 10 at the lowest gray scale is improved.

In this embodiment, the refractive index of the second prism 230 is greater than or equal to the refractive index of the first prism 220 . 8 is a display device according to an embodiment of the present invention, when the refractive index of the first wafer is greater than or smaller than the refractive index of the second wafer at the lowest gray scale and the relative luminance values in the horizontal viewing angle direction are relative to each other. The graph of the angle of view. The curve C9 in FIG. 8 shows that the refractive index of the first wafer 220 is 1.65, and the refractive index of the second wafer 230 is 1.52; the curve C10 shows that the refractive index of the first wafer 220 is 1.52, and the halide refractive index of the second zirconium sheet 230 is 1.65. Referring to FIG. 8 , in the display device 10 according to an embodiment of the present invention, when the refractive index of the second wafer 230 is greater than or equal to the refractive index of the first wafer 220 , the display device 10 is at the lowest gray level. The problem of light leakage at large viewing angles has also been improved.

Referring again to FIG. 6A , in one embodiment, the first atomizing layer 220 and the second atomizing layer 230 respectively have a first atomizing structure layer 226 and a second atomizing layer on the lower surfaces 224S2 and 234S2 facing the optical plate 212 . In the structure layer 236 , the haze of the second atomization structure layer 236 is preferably less than or equal to the haze of the first atomization structure layer 226 . 9 is a display device according to an embodiment of the present invention, the haze of the first atomized structure layer of the first iris sheet is greater than and smaller than the haze of the second atomized structure layer of the second iris sheet at the lowest gray scale A graph of relative luminance values in the horizontal viewing angle direction versus viewing angle. The curve C11 in FIG. 9 shows that the haze of the first atomization structure layer 226 is 3%, and the haze of the second atomization structure layer 236 is 8%; the curve C12 shows the haze of the first atomization structure layer 226 The haze is 8%, and the haze of the second haze structure layer 236 is 3%. Referring to FIG. 9 , in the display device 10 according to an embodiment of the present invention, when the haze of the second atomization structure layer 236 is less than or equal to the haze of the first atomization structure layer 226 , the display device 10 is at the lowest gray level. The problem of light leakage at large viewing angles has also been improved.

FIG. 10A is an example of a light output shape of a display device according to an embodiment of the present invention. FIG. 10B is an example of the light emitting shape of the backlight module of the display device according to an embodiment of the present invention. 10A and 10B illustrate that the first extending direction E1 of the light diffusing film 250 of the display device 10 and the backlight module 200 is at 0 degrees in the axial direction, and the third direction D3 of the reflective polarizing film 240 is at 45 degrees in the axial direction , the fourth extending direction E4 of the second fin 230 is at 45 degrees in the axial direction, and the third extending direction E3 of the first fin 220 is at 135 degrees in the axial direction. Referring to FIGS. 10A and 10B , in the display device 10 according to an embodiment of the present invention, due to the arrangement of each mold layer of the display device 10 , the light shape of the backlight module 200 is relatively symmetrical and collimated, and the display device 10 has The light shape of the displayed display screen is also relatively symmetrical.

FIG. 11A is a graph showing relative luminance values in the horizontal viewing angle direction versus viewing angle at the lowest gray scale of the display device according to an embodiment of the present invention. 11B is a graph of relative luminance values in the vertical viewing angle direction versus viewing angle at the lowest gray scale of the display device according to an embodiment of the present invention. Curves C13 and C15 in FIGS. 11A and 11B indicate that the display device is not provided with a light-diffusing film, and the third direction of the reflective polarizing film is at 45 degrees in the axial direction, and the fourth extending direction of the second polar film is in the axial direction. The direction is 150 degrees, and the third extending direction of the first wafer is 60 degrees in the axial direction; the curves C14 and C16 indicate that the first extending direction E1 of the light-diffusing film 250 of the display device is 0 degrees in the axial direction, and the reflective polarizing film The third direction D3 of the sheet 240 is at 45 degrees in the axial direction, the fourth extending direction E4 of the second sheet 230 is at 45 degrees in the axial direction, and the third extending direction E3 of the first sheet 220 is at 135 degrees in the axial direction. Referring to FIGS. 11A and 11B , in the display device 10 according to an embodiment of the present invention, due to the setting of each mode layer of the display device 10 , the vertical viewing angle and the horizontal viewing angle of the display device 10 at the lowest gray scale peak at the large viewing angle It is reduced by 40%. Therefore, the problem of light leakage at the vertical viewing angle and the large viewing angle of the horizontal viewing angle of the display device 10 at the lowest gray scale is effectively improved.

Besides, in this embodiment, the average gamma value of the image light in the range of 32 to 192 grayscale values along the 60-degree viewing angle of the liquid crystal module 10 is greater in the horizontal viewing angle direction than in the vertical viewing angle direction.

To sum up, in the display device of an embodiment of the present invention, since the light-diffusing film is provided on the reflective polarizing film, and the matching of each film layer in the display device, the backlight module of the display device is The light shape of the provided surface light source is relatively symmetrical and collimated, and the problem of large viewing angle light leakage of the vertical viewing angle and the horizontal viewing angle of the display device at the lowest gray scale is effectively improved. In addition, the display device adopts a dual-domain liquid crystal layer, so the brightness performance of the display device is better.

10: Display device 100: LCM 110: dual domain liquid crystal layer 120: Lower polarizer 130: Upper polarizer 132: Second Microstructure 132F: Second Turning Area 132S, 252S, 222S, 232S: Surface 134, 224, 234, 254: substrate 134S, 224S1, 234S1, 254S: Upper surface 200: Backlight module 210: Lighting module 212: Optical Board 212S1: light-emitting surface 212S2: light incident surface 214: Light Source 220: The First Pills 222: The first microstructure 222F: Third Turning Area 222T, 232T: tip 224S2, 234S2: lower surface 226: The first atomization structure layer 230: The Second Pill 232: Microstructure of the second crystal 232F: Third Turning Area 236: The second atomization structure layer 240: Reflective polarizing film 250: Diffuser film 252: First Microstructure 252F, 252F1: The first turning area 260: Quantum Dot Layer A: Arrangement direction C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16: Curves D1: first direction D2: Second direction D3: third direction E1: The first extension direction E2: The second extension direction E3: The third extension direction E4: Fourth extension direction H: horizontal arrangement direction L': height difference LM1, LM2, LM3, LM4, LM5: Local extrema P: Pitch R1, R2: radius of curvature

FIG. 1 is an exploded perspective view of a display device according to an embodiment of the present invention. 2 is a cross-sectional view of a light diffusing film of a display device according to an embodiment of the present invention. FIG. 3 is a graph showing the luminance gain ratio of the display device according to an embodiment of the present invention with respect to the average height L/average pitch P between the first microstructures. 4 is a cross-sectional view of an upper polarizer of a display device according to an embodiment of the present invention. FIG. 5A is a graph showing a gamma value versus gray scale in a vertical viewing angle direction in which the upper polarizer is not provided with the second microstructure in a display device according to an embodiment of the present invention. FIG. 5B is a graph showing the gamma value versus gray scale in the vertical viewing angle direction of the second microstructure disposed on the upper polarizer in the display device according to an embodiment of the present invention. FIG. 6A is a cross-sectional view of a first iris sheet or a second iris sheet of a display device according to an embodiment of the present invention. FIG. 6B is a partial enlarged view of the microstructure of the first ion or the microstructure of the second ion of FIG. 6A . 7 is a display device according to an embodiment of the present invention, the radius of curvature of the tip of the first microstructure of the first wafer is larger and smaller than the radius of curvature of the second microstructure of the second wafer A graph of the relative luminance value of the tip's radius of curvature at the lowest gray level and the horizontal viewing angle direction versus viewing angle. 8 is a display device according to an embodiment of the present invention, when the refractive index of the first wafer is greater than or smaller than the refractive index of the second wafer at the lowest gray scale and the relative luminance values in the horizontal viewing angle direction are relative to each other. The graph of the angle of view. 9 is a display device according to an embodiment of the present invention, the haze of the first atomized structure layer of the first iris sheet is greater than and smaller than the haze of the second atomized structure layer of the second iris sheet at the lowest gray scale A graph of relative luminance values in the horizontal viewing angle direction versus viewing angle. FIG. 10A is an example of a light output shape of a display device according to an embodiment of the present invention. FIG. 10B is an example of the light emitting shape of the backlight module of the display device according to an embodiment of the present invention. FIG. 11A is a graph showing relative luminance values in the horizontal viewing angle direction versus viewing angle at the lowest gray scale of the display device according to an embodiment of the present invention. 11B is a graph of relative luminance values in the vertical viewing angle direction versus viewing angle at the lowest gray scale of the display device according to an embodiment of the present invention.

10: Display device

100: LCM

110: dual domain liquid crystal layer

120: Lower polarizer

130: Upper polarizer

132: Second Microstructure

200: Backlight module

210: Lighting module

212: Optical Board

212S1: light-emitting surface

212S2: light incident surface

214: Light Source

220: The First Pills

222: The first microstructure

230: The Second Pill

232: Microstructure of the second crystal

240: Reflective polarizing film

250: Diffuser film

252: First Microstructure

260: Quantum Dot Layer

A: Arrangement direction

D1: first direction

D2: Second direction

D3: third direction

E1: The first extension direction

E2: The second extension direction

E3: The third extension direction

E4: Fourth extension direction

H: horizontal arrangement direction

Claims (20)

A display device, comprising: A liquid crystal module, including: a dual-domain liquid crystal layer, wherein the liquid crystal molecules of the dual-domain liquid crystal layer are aligned along a horizontal alignment direction when no voltage is applied; A lower polarizer, having a transmission axis along a first direction, wherein the angle between the first direction and the horizontal arrangement direction is within the range of 45±5 degrees; and an upper polarizer having a transmission axis along a second direction, wherein the lower polarizer, the dual-domain liquid crystal layer and the upper polarizer are sequentially arranged in an alignment direction; and A backlight module for providing a light source, the backlight module includes: A light-emitting module, including: an optical plate having a light-emitting surface and a light-incident surface; and a light source, arranged on one side of the light incident surface of the optical plate; 1. first glutinous rice tablet; 1. The second tablet; a reflective polarizing film having a transmission axis along a third direction, wherein the included angle between the third direction and the first direction is in the range of 0±5 degrees; and a light-diffusing film having a plurality of first microstructures extending along a first extending direction; Wherein the light emitting module, the first iris sheet, the second iris sheet, the reflective polarizing film, the light diffusing film and the liquid crystal module are sequentially arranged in the arrangement direction, and the light emitting module The emitted light is emitted through the light-emitting surface of the optical plate, and then passes through the first iris sheet, the second iris sheet, the reflective polarizing film, the light-diffusing film and the liquid crystal module in sequence, so as to An image light is formed. The display device of claim 1, wherein an angle between the second direction of the upper polarizer and the first direction of the lower polarizer is within a range of 90±5 degrees, and the upper polarizer has A plurality of second microstructures along a second extending direction, the included angle between the second extending direction and the horizontal arrangement direction is less than or equal to 20 degrees. The display device as claimed in claim 2, wherein the first wafer has a plurality of first wafer microstructures extending along a third extension direction, wherein an angle between the third extension direction and the first direction is included within the range of 90±20 degrees. The display device according to claim 3, wherein the second wafer has a plurality of second wafer microstructures extending along a fourth extending direction, wherein the included angle between the fourth extending direction and the first direction is less than is equal to 20 degrees. The display device of claim 4, wherein an angle between the first extending direction of the light-diffusing film and the fourth extending direction of the second wafer is within a range of 45±10 degrees. The display device as claimed in claim 5, wherein the first microstructures, the second microstructures, the first zirconium microstructures and the second zirconium microstructures respectively have a plurality of first turning regions , a plurality of second inflection areas, a plurality of third inflection areas and a plurality of fourth inflection areas, the first inflection areas, the second inflection areas, the third inflection areas and the fourth inflection areas respectively For the first microstructures, the second microstructures, the first high-density microstructures and the second high-density microstructures adjacent to each local extrema relative to the surface of the optical plate The region where the height difference between the local extrema along the arrangement direction falls within the range of 0 to 10%; The extension directions of the first inflection areas, the second inflection areas, the third inflection areas and the fourth inflection areas are perpendicular to the first microstructures, the second microstructures, and the first microstructures, respectively. The direction of the arrangement of the first zirconium microstructure and the second zirconium microstructures. The display device according to claim 6, wherein the projected area of the first turning regions on the upper surface of the light-diffusing film relative to the optical plate is the same as the projection area of the first microstructures on the upper surface of the light-diffusing film The ratio of the projected area is greater than or equal to 30% and less than or equal to 60%. The display device according to claim 6, wherein the projected area of the second turning regions on the upper polarizer relative to the upper surface of the optical plate is the same as the projection area of the second microstructures on the upper surface of the upper polarizer The ratio of the projected area is greater than or equal to 85% and less than or equal to 93%. The display device according to claim 6, wherein the projected areas of the third turning areas on the first iris sheet relative to the upper surface of the optical plate and the first iris microstructures on the first iris sheet The ratio of the projected area of the upper surface is greater than or equal to 21% and less than or equal to 25%. The display device as claimed in claim 6, wherein the projected areas of the fourth turning areas on the second wafer relative to the upper surface of the optical plate and the second wafer microstructures are in the second wafer. The ratio of the projected area of the upper surface is greater than or equal to 21% and less than or equal to 25%. The display device of claim 1, wherein the average height difference of the first microstructures is L, the average pitch is P, and 4%≦L/P≦25%. The display device as claimed in claim 4, wherein the radius of curvature of each second microstructure relative to the tip of the optical plate is less than or equal to the edge of each first microstructure relative to the optical plate The radius of curvature of the mirror tip. The display device as claimed in claim 1, wherein the refractive index of the second wafer is greater than or equal to the refractive index of the first wafer. The display device as claimed in claim 1, wherein the first and second iris sheets respectively have a first atomization structure layer and a second atomization structure layer on the lower surface facing the optical plate, the first atomization structure layer The haze of the second atomized structure layer is less than or equal to the haze of the first atomized structure layer. The display device according to claim 1, wherein the optical plate is a light guide plate, and the light exit surface is adjacent to the light entrance surface. The display device according to claim 1, wherein the optical plate is a diffuser plate, and the light-emitting surface is opposite to the light-incident surface. The display device of claim 1, wherein the backlight module further comprises a quantum dot layer disposed on the optical plate, and the light source comprises a blue light source. The display device as claimed in claim 17, wherein the quantum dot layer is disposed between the optical plate and the first wafer. The display device of claim 1, wherein the average gamma value of the image light in the range of 32 to 192 grayscale values along the 60-degree viewing angle of the liquid crystal module is greater in the horizontal viewing angle direction than in the vertical viewing angle direction. The display device of claim 2, wherein the average gamma value of the image light in the range of 32 to 192 grayscale values along the 60-degree viewing angle of the liquid crystal module is greater in the horizontal viewing angle direction than in the vertical viewing angle direction.

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