TWI430221B - Display system with wide horizontal viewing range and narrow vertical viewing range - Google Patents

Description

Display system with wide horizontal viewing angle range and narrow vertical viewing angle range

The present invention relates to a display system, particularly a liquid crystal display system. And in particular, the present invention relates to display systems having a wide horizontal viewing angle range and a narrow vertical viewing angle range.

Display systems used in certain places, for example, display systems for vehicle display systems, traffic signs, etc., have a horizontal viewing angle range that is as wide as possible, whereas the vertical viewing angle range of these display systems is limited. For example, the vehicle display system needs to have a wide horizontal viewing range so that both the driver and the passenger can see the displayed image, and a limited vertical viewing angle range is required to prevent the display image from being projected onto the windshield of the vehicle, affecting the driving sight. . In these display systems, the light emitted by the light source needs to be adjusted by a plurality of optical elements to achieve a wide horizontal viewing angle range and a narrow vertical viewing angle range.

For the prior art of a display system having a wide horizontal viewing angle range and a narrow vertical viewing angle range, for example, Japanese Patent Publication No. 2002124112 (hereinafter referred to as the former case 1) and the Republic of China Invention Patent Publication No. I253525 (hereinafter referred to as the former case) two). Both of the prior art techniques are directed to a solution proposed by a display system using a liquid crystal display panel.

However, prior art display systems having a wide horizontal viewing angle range and a narrow vertical viewing angle range still have overall luminance that is too low and the horizontal viewing angle range is not wide enough, such as below 95 degrees.

In addition, in the prior art of a display system having a wide horizontal viewing angle range and a narrow vertical viewing angle range, if a side-light type light-emitting diode (LED) backlight is used, the LEDs required to achieve the required luminance are required. The number is quite a lot. Therefore, when these prior art adopts the edge-lit LED backlight, there are problems such as power consumption and an increase in operating temperature.

One aspect of the present invention is directed to providing a display system having a wide horizontal viewing angle range and a narrow vertical viewing angle range, the horizontal viewing angle range being higher than 95 degrees, and the overall luminance being high.

Another aspect of the present invention is to provide a liquid crystal display system having a wide horizontal viewing angle range and a narrow vertical viewing angle range, which can reduce the number of backlights used or save the brightness or energy required for the backlight.

A display system according to a first embodiment of the present invention defines a horizontal direction and a vertical direction by itself, and includes a planar light source, a prism sheet, a lens sheet, and a louver sheet ( Louver sheet). The planar light source has a light-emitting surface, and the thin plate is disposed above the light-emitting surface of the planar light source. The crucible sheet contains a plurality of elongated micro-twisted structures. A plurality of elongated micro-structures are arranged in parallel in the horizontal direction. The lens sheet is disposed above the crucible sheet. The lens sheet comprises a plurality of microlens structures, and the louver sheets are disposed above the lens sheets. The louver sheet contains a plurality of strip-shaped micro-louver structures. The plurality of elongated louver structures are arranged substantially parallel to each other in the vertical direction and at an angle to the horizontal direction. Light is emitted from the exit surface of the planar light source, through the thin plate, the lens sheet and the louver sheet, and is adjusted by the thin plate, the lens sheet and the louver sheet, so that the horizontal viewing angle range of the display system is higher than 95 degrees, and the vertical viewing angle range It is above 20 degrees.

A display system according to a second embodiment of the present invention comprises a planar light source, a thin plate, a lens sheet, and a louver sheet. The 稜鏡 thin plate is disposed above the light emitting surface of the planar light source, and the 稜鏡 thin plate comprises a plurality of elongated micro 稜鏡 structures. The lens sheet is disposed above the crucible sheet and is located on one side of the opposite planar light source, and the lens sheet comprises a plurality of microlens structures. The louver sheet is disposed above the lens sheet and on a side opposite to the sheet, the louver sheet comprising a plurality of elongated louver structures. Each micro-turn structure has a non-uniform trapezoidal shape along its longitudinal axis.

In one embodiment, the plurality of micro-louver structures of the louver sheet form an angle with the horizontal direction ranging from about 0 degrees to about ±10 degrees.

In one embodiment, the plurality of microlens structures of the lens sheet are irregularly arranged.

In a specific embodiment, the display system further includes a polarizer, and the polarizer is disposed above the louver sheet and has a spacing from the louver sheet.

In one embodiment, the two adjacent micro-twisted structures of the plurality of micro-turns of the tantalum plate have a pitch.

In one embodiment, the plurality of micro-turn structures of the thin plate face the planar light source, and the plurality of microlens structures of the lens sheet face the louver sheet.

In another embodiment, the plurality of micro-twisted structures of the thin plate face the lens sheet, and the plurality of microlens structures of the lens sheet face the thin plate.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

The present invention provides a display system having a wide horizontal viewing angle range and a narrow vertical viewing angle range, the horizontal viewing angle range being higher than 95 degrees, and the overall luminance being high. The specific embodiments of the present invention are described in detail below, in order to fully explain the features, the

Please refer to FIG. 1 and FIG. 2, which is a schematic view showing the appearance of a display system 1 according to a first preferred embodiment of the present invention. Fig. 2 is a cross-sectional view of the display system 1 in Fig. 1 taken along line A-A in Fig. 1. In all of the cross-sectional views of this specification, each component is specifically provided with a perspective view in recognition of its structural characteristics.

As shown in Fig. 1, a display system 1 according to a first preferred embodiment of the present invention defines a horizontal direction H , a normal direction N, and a vertical direction V by itself . The normal direction N is perpendicular to the display system 1, and is perpendicular to the horizontal direction H and the vertical direction V , respectively, and the horizontal direction H is also perpendicular to the vertical direction V. The display system 1 includes a bezel 11. The frame 11 is structurally fitted to the edge of the display system 1 for securing the other components of the display system 1 together.

As shown in FIG. 2, the display system 1 according to the first preferred embodiment of the present invention comprises a planar light source 10, a thin plate 12, a lens sheet 14, and a louver sheet 16. For convenience of explanation, the present embodiment is explained only by the internal components of the display system 1, and therefore the second frame 11 is not shown in FIG.

Also shown in Fig. 2, the planar light source 10 has a light exit surface 102. The thin plate 12 is disposed above the light exit surface 102 of the planar light source 10. The crucible sheet 12 includes a plurality of elongated micro-twist structures 122. The plurality of elongated micro-twist structures 122 are arranged approximately parallel in the horizontal direction H. That is, the longitudinal axis of each of the micro-twist structures 122 is approximately parallel to the V- direction. In detail, the strip-shaped micro-structures 122 are arranged along the first array direction. In the embodiment, the first array direction is the horizontal direction H. As shown in FIG. 2, the micro-frame structure 122 is along the horizontal direction. H is arranged, and the two or two strips of micro-twisted structures 122 may be arranged in parallel with each other, but the invention is not limited thereto. The strip-shaped micro-small structure 122 extends along the second array direction, that is, in each of the micro-twist structures 122, the apex of the micro-twist structure 122 forms a vertex line, wherein the vertex line is along the second The direction of the arrangement extends. In this embodiment, the second alignment direction is the vertical direction V , and the two vertex lines may be parallel to each other, but the invention is not limited thereto.

In one embodiment, the two adjacent micro-twist structures 122 of the plurality of micro-turn structures 122 of the tantalum sheet 12 have a pitch d, as shown in FIG. A preferred example of the distance d between the two adjacent micro-twisted structures 122 is 50 micrometers, but the invention is not limited thereto, and the spacing d between the micro-twisted structures 122 may vary according to different design requirements. For example, when the spacing d is increased, the viewing angle range can be increased, and when the spacing d is decreased, the light collecting effect can be increased. In the present embodiment, each of the micro-structures 122 of the meandering plate 12 has a non-uniform trapezoidal shape along its longitudinal axis. That is, each micro-twist structure 122 has a trapezoidal cross-section along its longitudinal axis, and its height or/and the width of the upper base are not the same. In detail, the micro-twist structure 122 forms a cross-section along the parallel second array direction and perpendicular to the first array direction. As shown in FIG. 2, the cross-section is parallel to the vertical direction V and perpendicular to the horizontal direction V. Formed, in other words, the cross section is formed along the normal direction N. In the present embodiment, the cross section of the micro-twist structure 12 is trapezoidal, thereby enhancing the strength of the micro-twist structure, avoiding the collapse of the micro-turn structure, increasing the shielding property, and avoiding the appearance of a corrugated picture on the display system 1. "Morray effect (Moir Effects)" and so on.

In this embodiment, the cross sections of the two microprism structures 122 may be different or similar trapezoids. For example, the two trapezoidal structures may have the same lower base length, but the heights are different to form a different structure. Or the two-two ladder structure has the same lower base length to height ratio, but the height is not the same to form a similar structure, but the invention is not limited thereto. In addition, in the same micro-twist structure 122, there may be a plurality of cross-sections of the micro-twist structure 122, and the trapezoidal structure formed by each cross-section may have a different or similar structure as described above.

The above embodiment only describes that the two micro-twisted structures 122 can form a non-uniform trapezoidal cross-sectional structure under the same cross-section. However, in another embodiment, under the same micro-twisted structure 122, there may be multiple mutual Parallel sections form a cross-sectional structure of a non-uniform trapezoid.

In the present embodiment, the non-uniform trapezoidal micro-twist structure can disperse the pressure or gravity received by the thin plate 12 to increase the strength of the micro-twist structure, and at the same time obtain appropriate light collection and diffusion. The effect is to take into account the brightness of the light source and the wide viewing angle. In one embodiment, each micro-twist structure 122 has a height along the longitudinal axis of the trapezoid having the same base length, and the height ranges from 20 micrometers to 22 micrometers, and each micro-twist structure 122 follows The vertical axis has a trapezoidal upper base width ranging from 3 micrometers to 5 micrometers, wherein the vertical axis is along the normal direction N, or the ratio of the height of the cross-sectional trapezoidal structure to the width of the lower base is 40% to 50%.

Also shown in Fig. 2, the lens sheet 14 is disposed above the rafter 12. Lens sheet 14 includes a plurality of microlens structures 142. In this embodiment, the microlens structure 142 is a granular structure having a curved surface, wherein the microlens structure 142 may have a regular arrangement. For example, the two microlens structures 142 have the same pitch. Or the microlens structure 142 is arranged in a checkerboard pattern. In another embodiment, the microlens structure 142 may also be arranged irregularly. For example, the two lens structures 142 have unequal distances therebetween, and the microlens structure 142 does not have a specific direction or two or two. The particle size of the microlens structure 142 is different, as shown in FIG.

In one embodiment, when the microlens structure 142 is irregularly arranged, the distribution density of the plurality of microlens structures 142 of the lens sheet 14 (the area occupied by all the microlens structures / the total area of the surface forming the microlens structure) ) is about 65% to 75%. Each microlens structure 142 has a diameter of between about 51 microns and 65 microns. The hemispherical geometric ratio of each microlens structure 142 (the height of the microlens structure / the diameter of the microlens structure) is about 40% to 50%. Multiple microlens structures 142 The distribution density and the geometrical size are within the above range, and the haze of the lens sheet 14 is about 84%.

The illustration of the present embodiment is illustrated by the micro-twist structure 122 having the same trapezoidal cross-section and the micro-lens structure 142 having the regular arrangement. However, the invention is not limited thereto. In addition, the illustration of the present embodiment is only described by the microlens structure 142 corresponding to the micro-twist structure 122, but the invention is not limited thereto. For example, the spacing between the micro-lens structures 142 may be different from that of the micro-lens structure 142. The spacing between the structures 122 is different, or the microlens structures 142 may be irregularly arranged.

Also shown in Fig. 2, the louver sheet 16 is disposed above the lens sheet 14. Figure 2 specifically shows a perspective view of the louver sheet 16 in recognition of its structural characteristics. The louver sheet 16 includes a plurality of elongated louver structures 162. The plurality of elongated louver structures 162 are generally arranged approximately parallel in the vertical direction V and at an angle to the horizontal direction H. A plurality of micro-louver structures 162 are used to control the path or direction of light travel, which acts like a light valve or a grating. The light emitted from the planar light source 10 and not adjusted by the optional optical element passes through the louver sheet 16, and the vertical light exit angle of the light ranges from about 60 degrees. The definition of the vertical light-emitting angle range is based on the maximum luminance of the output light, and is extended from the normal line N (the angle of view is 0 degrees) to the vertical direction V to an angle of one-half of the maximum luminance. In the present embodiment, the horizontal direction H and the edges of the louver sheets 16 are parallel to each other.

In a specific embodiment, the plurality of micro louver structures 162 of the louver sheet 16 extend in a direction L, and the extending direction L has an angle with the horizontal direction H. Suitable angle It is possible to avoid the occurrence of "Moiré effects" in the display system 1. In this embodiment, the angle is The range is about 0 to ±10 degrees. Further, as shown in Fig. 2, the angle H is counterclockwise and forms an angle with the extending direction L based on the horizontal direction H. The range is from 0 to 10 degrees. Similarly, when the angle Φ is formed in the clockwise direction with respect to the horizontal direction H, the angle Φ ranges from 0 degrees to -10 degrees, so the angle Φ ranges from about 0 degrees. Up to +10 degrees. In the present embodiment, as shown in FIG. 2, the elongated micro-twist structure 122 extends along the vertical direction V and is arranged in the horizontal direction H, and the micro-louver structure 162 has a specific angle along the horizontal direction H. Extend in a specific direction. Therefore, the extending direction of the micro louver structure 162 and the micro 稜鏡 structure 122 is disposed in an nearly orthogonal direction, wherein the nearly orthogonal direction is affected by the specific angle between the micro louver structure 162 and the horizontal direction H, and the orthogonal direction There is a slight offset. For example, when the angle Φ between the micro louver structure 162 and the horizontal direction H is 0 degrees, the extending direction of the micro louver structure 162 and the micro 稜鏡 structure 122 are perpendicular to each other, and are also in an orthogonal relationship. When the angle Φ between the micro louver structure 162 and the horizontal direction H is 10 degrees, the extending direction of the micro louver structure 162 and the micro 稜鏡 structure 122 is 80 degrees or 100 degrees, so the micro louver structure 162 and the micro 稜鏡 structure The extending direction of the 122 is respectively an angle. In the embodiment, the angle ranges from 80 degrees to 100 degrees, and the angle between the clockwise or counterclockwise is determined by the micro-louver structure or the micro-structure structure 122 as a reference. Can be met.

As shown in Fig. 2, light is emitted from the light exit surface 102 of the planar light source 10 through the thin plate 12, the lens sheet 14, and the louver sheet 16. The arrow mark in Figure 2 represents the direction of travel of the light. The light is adjusted by the lamella 12, the lens sheet 14, and the louver 16 such that the horizontal viewing angle ranges above 95 degrees and the vertical viewing angle is above 20 degrees. In the present embodiment, the horizontal viewing angle ranges from 95 degrees to 110 degrees, and the vertical viewing angle ranges from 20 degrees to 40 degrees. The horizontal viewing angle range θ is defined by the maximum luminance as a reference, and is extended from the normal line N (the angle of view is 0 degrees) to the horizontal direction H to an angle of one-half of the maximum luminance. The definition of the vertical viewing angle range α is based on the maximum luminance, and is extended from the normal line N (the angle of view is 0 degrees) to the vertical direction V to an angle of one-half of the maximum luminance. For example, adjusting the micro-twist structure 122 of the thin plate 12, such as increasing the height ratio of the trapezoidal cross-section of the micro-turn structure 122, to increase the light collecting effect, or reducing the height ratio, to increase the breadth of the viewing angle. In addition, the direction of extension of the micro-louver structure 162 of the louver sheet 16 is adjusted to adjust the path through which the light source passes, thereby changing the viewing angle or brightness. In addition, the distribution density of the microlens structure 142 of the lens sheet 14 is changed to increase the light collecting effect, or to adjust the radius curvature distribution of the microlens structure 142, thereby changing the width of the viewing angle.

In one embodiment, as shown in FIG. 2, the plurality of micro-structures 122 of the thin plate 12 face the planar light source 10, and the plurality of microlens structures 142 of the lens sheet 14 face the louver sheet 16. That is, the micro-twist structure 122 and the microlens 142 face the opposite directions, respectively. In this embodiment, the micro-twist structure 122 faces the planar light source 10, that is, the bottom edge of the micro-turn structure 122 is disposed downward. At this time, the optical path of the planar light source 10 is trapped by the trapezoidal structure of the micro-turn structure 122. Side effects, and spread to the sides to increase the breadth of the angle of view. At the same time, the concentrating effect is compensated by using the microlens structure 142 disposed upward to increase the brightness so that both the wide viewing angle and the high brightness can be combined.

In another embodiment, as shown in FIG. 3, the plurality of micro-structures 122 of the thin plate 12 face the lens sheet 14, and the plurality of microlens structures 142 of the lens sheet 14 face the thin plate 12. That is, the micro-twist structure 122 and the micro-lens structure 142 are face-to-face and face each other in opposite directions. In this embodiment, the micro-twist structure 122 faces the image forming panel 18, that is, the bottom edge of the micro-turn structure 122 is disposed upward. At this time, the optical path of the planar light source 10 is affected by the trapezoid of the micro-structure 122. With light collection and diffusion effects. The arrow mark in Figure 3 represents the direction of travel of the light. Obviously, the form of the optical path in Fig. 2 is different from the form of the optical path in Fig. 3. The components in Fig. 3 having the same reference numerals as in Fig. 2 have the same or similar structures and functions, and will not be described here. In another embodiment, the display system 1 shown in FIGS. 2 and 3 is suitable as a traffic sign if the LED light source is disposed, but the invention is not limited thereto and can be applied to a vehicle display.

The appearance of the display system 1 according to the second preferred embodiment of the present invention remains as shown in FIG. Please refer to FIG. 4, which is a cross-sectional view of the display system 1 taken along line A-A of FIG. 1 according to a second preferred embodiment of the present invention.

In another embodiment, the display system 1 further includes an image forming panel 18 and a polarizer 182, as shown in FIGS. 4 and 5. The image forming panel 18 is disposed above the louver 16 for forming an image. For example, the image forming panel 18 can be a liquid crystal panel, an electrophoretic display, a plasma display panel, or a stereoscopic display. The fourth and fifth figures have the same or similar structures and functions as those of the second and third figures, and will not be described here.

In one embodiment, the polarizer 182 is disposed above the louver 16 , in other words, the polarizer 182 is disposed between the louver 16 and the image forming panel 18 . In the present embodiment, the polarizer 182 and the louver sheet 16 have a spacing s, and the pitch s is used to change the focal length on the field of view, thereby eliminating the original Murray effect. In this embodiment, an object such as a frame, a spacer or a spacer can be used to maintain the spacing s between the polarizer 182 and the louver sheet 16 to increase stability.

In another embodiment, the polarizer 182 has an atomizing effect for reducing brightness unevenness to achieve the effect of brightness correction, in other words, using the polarizing plate 182 having an atomizing effect for uniform brightness and avoiding local bright areas. Or a phenomenon of a partial dark region, wherein the haze of the polarizer 182 is 20% to 40%, although the invention is not limited thereto. However, the present embodiment is described only by the polarizer 182 disposed under the image forming panel 18, but the polarizer may also have a haze above the image forming panel 18.

In a specific embodiment, as shown in FIGS. 4 and 5, the planar light source 10 includes a light guiding element 104 and a plurality of light emitting diodes 106 disposed at M sides of the light guiding element 104, wherein M is 1 , 2 or 3. The plurality of light emitting diodes 106 are driven to emit light into the light guiding element 104, and the light is guided by the light guiding element 104 to the thin plate 12. However, the present embodiment only provides a description of forming a planar light source by using a side light-emitting element in combination with a light-guiding element, but is not limited thereto. In this embodiment, the more the LEDs 106 are disposed at the side of the light guiding element 104, the brightness and the center brightness of the display system 1 can be increased, and the horizontal viewing angle range can be made wider.

Please refer to Figure 6 and Figure 7. Figure 6 is a comparison of the simulation data of the horizontal direction luminance when the same side-lit LED backlight is used, the liquid crystal display system of the fourth figure architecture, the liquid crystal display system of the fifth figure architecture, and the liquid crystal display system of the previous case. . Fig. 7 is a comparison chart of the simulation data of the three kinds of liquid crystal display systems with respect to the vertical direction luminance. In the two figures, the definition of the viewing angle range is based on the maximum luminance, and is extended to the horizontal or vertical direction to the angle of one-half of the maximum luminance centered on the normal N (the viewing angle is 0 degrees).

As can be clearly seen from the data in Fig. 6, the liquid crystal display system of the pre-production case has a horizontal viewing angle range of less than about 95 degrees. For example, the liquid crystal display system of the pre-production case has a horizontal viewing angle range of about 92 degrees. The liquid crystal display system of the fourth figure architecture has a horizontal viewing angle of about 104 degrees. The horizontal viewing angle range of the liquid crystal display system adopting the structure of FIG. 5 is wider than that of the liquid crystal display system of the fourth drawing architecture, but the brightness of the central viewing angle of the liquid crystal display system adopting the fifth drawing structure is significantly reduced. The liquid crystal display system adopting the structure of Fig. 4 has uniformity of overall luminance compared with the uniformity of overall luminance of the liquid crystal display system of the fifth drawing architecture. The overall brightness of the liquid crystal display system adopting the structure of Fig. 4 and the liquid crystal display system adopting the structure of Fig. 5 is much higher than that of the liquid crystal display system of the pre-production case.

As is clear from the data of Fig. 7, the above four liquid crystal display systems have a vertical viewing angle range of about 20 to 40 degrees.

Please refer to Figure 8 and Figure 9. Fig. 8 is a comparison diagram of simulation data regarding the relative luminance in the horizontal direction when the same edge-lit LED backlight is used, the liquid crystal display system of the structure of Fig. 4 and the liquid crystal display system of the second example. Figure 9 is a comparison of simulated data for the relative luminance in the vertical direction of the two liquid crystal display systems. In the two figures, the definition of the viewing angle range is extended to the horizontal or vertical direction by an angle of 50% relative to the normal N (the viewing angle is 0 degrees).

It can be clearly seen from the data in Fig. 8 that the liquid crystal display system of the pre-second case has a horizontal viewing angle range of less than about 95 degrees. For example, the liquid crystal display system of the second case has a horizontal viewing angle range (θ1) of 92 degrees. The liquid crystal display system of the structure of Fig. 4 has a horizontal viewing angle range (θ2) of about 104 degrees. It can be clearly seen from the data in Fig. 9 that the liquid crystal display system of the second method and the liquid crystal display system of the fourth embodiment can be limited to a range of about 20 to 40 degrees.

Significantly, the display system in accordance with the present invention has a horizontal viewing angle range greater than 95 degrees, which is wider than the horizontal viewing angle range of prior art display systems. The display system according to the present invention has a vertical viewing angle ranging from about 20 to 40 degrees. Moreover, the overall brightness of the display system according to the present invention is also higher than the overall luminance of the prior art display system. Due to the improvement of the overall brightness, the effect of wide viewing angle and brightness retention can be achieved by adjusting the thin plate 12, the lens sheet 14 and the louver sheet 16 under the framework of the embodiment, without increasing the number of backlights or increasing the number of backlights. Its brightness, therefore, can also save the amount or energy of the backlight.

In a simulation case, the liquid crystal display system of the fourth figure architecture is compared with the liquid crystal display system of the prior art. The two liquid crystal display systems use the same 6.5-inch LCD panel and edge-lit LED backlight. If the center (viewing angle is 0 degree) requires 3458 nits (cd/m ² ), the liquid crystal display system of the prior art requires 116 light-emitting diodes, and the liquid crystal display system of the fourth figure architecture only needs 32 light-emitting diodes. Polar body. Obviously, compared with the prior art, the liquid crystal display system according to the present invention consumes less power and is less subject to an increase in operating temperature.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed. Therefore, the scope of the patented scope of the invention should be construed as broadly construed in the

1. . . display system

10. . . Planar light source

102. . . Glossy surface

104. . . Light guiding element

106. . . Light-emitting diode

11. . . frame

12. . . Thin plate

122. . . Microstructure

14. . . Lens sheet

142. . . Microlens structure

16. . . Shutter shutter

162. . . Micro-louver structure

18. . . Image forming panel

182. . . Polarizer

H. . . horizontal direction

V. . . Vertical direction

N. . . Normal direction

L. . . The direction of extension of the micro-louver structure

d. . . spacing

s. . . spacing

Φ. . . Angle

θ. . . Horizontal viewing angle range

α. . . Vertical viewing angle range

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the appearance of a display system in accordance with a first preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view of the display system of Fig. 1 taken along line A-A of Fig. 1.

Figure 3 is a cross-sectional view showing another variation of the display system in accordance with the first preferred embodiment of the present invention.

Figure 4 is a cross-sectional view of a display system in accordance with a second preferred embodiment of the present invention.

Figure 5 is a cross-sectional view showing another variation of the display system in accordance with the second preferred embodiment of the present invention.

Figure 6 is a comparison of simulated data for horizontal brightness in three liquid crystal display systems.

Figure 7 is a comparison of simulated data for vertical luminance in three liquid crystal display systems.

Figure 8 is a comparison of simulated data on the relative luminance in the horizontal direction of the two liquid crystal display systems.

Figure 9 is a comparison of simulated data on the relative luminance of the vertical direction of the two liquid crystal display systems.

1. . . display system

10. . . Planar light source

102. . . Glossy surface

104. . . Light guiding element

106. . . Light-emitting diode

12. . . Thin plate

122. . . Microstructure

14. . . Lens sheet

142. . . Microlens structure

16. . . Shutter shutter

162. . . Micro-louver structure

18. . . Image forming panel

182. . . Polarizer

H. . . horizontal direction

V. . . Vertical direction

N. . . Normal direction

L. . . The direction of extension of the micro-louver structure

d. . . spacing

s. . . spacing

Φ. . . Angle

θ. . . Horizontal viewing angle range

α. . . Vertical viewing angle range

Claims (12)

A display system, which defines a horizontal direction and a vertical direction. The display system comprises: a planar light source having a light exiting surface; a prism sheet disposed on the planar light source a plurality of elongated micro-twisted structures arranged in parallel along the horizontal direction; a lens sheet disposed above the thin plate And comprising a plurality of microlens structures; a louver sheet disposed above the lens sheet and comprising a plurality of strip-shaped micro-louver structures, the plurality of strip-shaped micro-louver structures substantially Parallelly arranged in the vertical direction and at an angle to the horizontal direction; and an image-forming panel disposed above the louver sheet; wherein a light rays are emitted from the light-emitting surface of the planar light source, passing through the edge a mirror sheet, the lens sheet, and the louver sheet and advancing toward the image forming panel, and the sheet, the lens sheet, and the shutter Rectifying plate, resulting in a higher than the horizontal viewing angle range of 95 degrees and a vertical viewing angle range is greater than 20 degrees. The display system of claim 1, wherein the plurality of micro-louver structures form an angle with the horizontal direction ranging from about 0 degrees to ±10 degrees. The display system of claim 2, wherein the plurality of microlens structures of the lens sheet are irregularly arranged. The display system of claim 3, further comprising a polarizer disposed between the louver sheet and the image forming panel and spaced apart from the louver sheet. The display system of claim 1, wherein two adjacent micro-twisted structures of the plurality of micro-twisted structures have a pitch, each of the plurality of micro-twisted structures defining a vertical axis along a length thereof, and the plurality The cross section of the micro-twisted structure along its longitudinal axis is a non-uniform trapezoid. The display system of claim 1, wherein the plurality of micro-twist structures face the planar light source, and the plurality of micro-lens structures face the louver sheet. The display system of claim 6, wherein the plurality of micro-tunnel structures face the lens sheet, and the plurality of micro-lens structures face the tantalum sheet. A display system comprising: a planar light source; a thin plate having a plurality of elongated micro-twisted structures disposed above the planar light source; a lens thin plate disposed above the thin plate, and Located on one side of the planar light source, the lens sheet has a plurality of microlens structures; and a louver thin sheet having a plurality of elongated louver structures disposed above the lens sheet and located opposite one of the thin sheets a side; each of the micro-turn structures has a non-uniform trapezoidal shape along a longitudinal axis thereof, and the plurality of micro-稜鏡 structures are arranged in parallel along a first array direction, and the plurality of micro-louver structures of the louver sheet Arranging in parallel along a second array direction, the angle between the second array direction and a horizontal direction perpendicular to the first array direction is about 0 to ±10 degrees. The display system of claim 8, wherein the plurality of microlens structures of the lens sheet are irregularly arranged. The display system of claim 8, wherein the plurality of micro-plates of the thin plate The structure faces the planar light source, and the plurality of microlens structures of the lens sheet face the louver sheet. The display system of claim 8, wherein the plurality of micro-turn structures of the thin plate face the lens sheet, and the plurality of microlens structures of the lens sheet face the tantalum sheet. The display system of claim 11, further comprising a polarizer disposed above the louver sheet and having a spacing between the polarizer and the louver sheet.