CN102087435A - Reflection device and liquid crystal display device using the same - Google Patents

Abstract

A reflective device comprising a reflective layer comprising protrusions which are stripe-shaped protrusions extending around a central direction. The reflecting device provided by the invention has higher reflectivity and good uniformity in all azimuth angles. In addition, in the reflecting device provided by the invention, if the widths or the intervals of the strip-shaped bulges are different or the widths and the intervals are different, the interference phenomenon of light can be avoided, so that the poor visual effect is avoided. The invention also provides a liquid crystal display device which comprises a plurality of pixel units, wherein each pixel unit comprises a reflecting area, and the reflecting area adopts the reflecting device.

Description

Reflecting device and liquid crystal display device using the reflecting device

technical field

The invention relates to the field of liquid crystal display, and in particular designs a reflection device used in the field of liquid crystal display and a liquid crystal display device using the reflection device.

Background technique

According to the different light sources used, liquid crystal displays can be divided into transmissive liquid crystal displays with built-in backlight, reflective liquid crystal displays that reflect ambient light, and transflective liquid crystal displays that combine transmission and reflection.

The reflective liquid crystal display, and the reflective part in the transflective liquid crystal display, has the advantage that the contrast of the reflected light is not affected by the ambient light, so the liquid crystal display can maintain the Good readability. The reflective liquid crystal display and the transflective liquid crystal display include a reflective device for reflecting incident light from the outside. When designing a reflective device, how to obtain reflected light with high reflectivity and high contrast is a factor considered by the designer.

At the same time, the directionality of reflected light is one of the factors that affect the viewing angle. If the surface of the reflecting device constitutes a specular reflection, then for the directional light source (such as sunlight, light) incident from the outside world, after being reflected by the specular surface, the brightness in the direction of the outgoing light is too large to form glare, and the reflected light in other viewing directions is missing. , the brightness is extremely low, resulting in poor reflection characteristics.

In order to avoid poor reflection characteristics, modify the reflector to produce diffuse reflection. One of the solutions to produce diffuse reflection is a bumpy reflector.

A Chinese patent with the notification number CN1304890C discloses a reflector with spherical protrusions. Referring to FIG. 1 and FIG. 2 , the structure and partial top view of said patent are shown respectively. The reflector includes a reflective surface 100 with a reflective metal layer, a plurality of hemispherical protrusions 101 widely distributed on the reflective surface 100, and the ratio of the radius and height of the hemispherical protrusions 101 is in the range of 20:1～ 7:1, the radius range of the hemispherical protrusion 101 is 3 μm˜20 μm. The hemispherical protrusions 101 diffusely reflect the incident ambient light, and the reflected light can be uniformly or substantially uniformly scattered and emitted within a large spatial angle range, which eliminates glare and complements vignetting.

Referring to FIG. 3 , it shows a schematic diagram of another reflecting device in the prior art. The reflecting device includes a plurality of strip-shaped protrusions, and the strip-shaped protrusions form a first strip-shaped protrusion group 302 and a second strip-shaped protrusion group 301 arranged alternately in an orthogonal manner.

Referring to FIG. 4 , a schematic cross-sectional view of the protrusion 403 is shown. Next, the optical reflection characteristic analysis of the protrusion 403 is carried out. The incident light 401 is a parallel light beam with directionality. The upper substrate 404 emits, and the emitted light 402 enters human eyes. The reflective surface area surrounded by incident light 401 , reflected light 402 , and normal (as shown by the dotted line in FIG. 4 ) is the actual effective reflective area 405 , and the actual effective reflective area 405 is very small. In the reflection area of the same area of the reflection device, the larger the actual effective reflection area 405 is, the more light can enter the human eye, and the reflectivity of the reflection device is high.

Referring to FIG. 5 , it shows a simulation diagram of the actual effective reflection areas of the spherical protrusions 501 and the strip protrusions 503 . Limited by the process, the spherical protrusions 501 cannot be infinitely reduced, that is, the number of spherical protrusions is limited in a reflection area of the same area, and the actual effective area of the reflection area 502 of the spherical protrusions is also limited. However, the strip-shaped protrusions 503 connect a larger actual effective reflection area in the area originally belonging to the gap of the spherical protrusions 501 . As shown in Figure 5, in the case of occupying the same area reflection area, when the same incident light is incident 505, the actual effective reflection area 504 of the strip-shaped protrusion reflection device 503 is greater than the actual effective reflection area 502 of the spherical protrusion 501 reflection device, so The reflectivity of the strip-shaped protrusion reflecting device 503 is better than that of the spherical protrusion reflecting device 501 .

The strip-shaped protruding reflection device can increase the actual effective reflection area. As shown in FIG. 3 , the strip-shaped projection reflectors arranged vertically and horizontally have higher reflectivity at orthogonal azimuth angles, but the reflectivity at other azimuth angles of the reflectors is lower.

Contents of the invention

The present invention solves the problem that the reflecting device does not have high reflectivity for multiple continuous azimuth angles.

In order to solve the above problems, the present invention provides a reflection device, the reflection device includes a reflection layer, the reflection layer includes protrusions, and the protrusions are strip-shaped protrusions extending around a central direction.

Optionally, the center is the center of the reflecting device.

Optionally, the strip-shaped protrusions are multiple concentric annular protrusions.

Optionally, the strip-shaped protrusions are multiple concentric polygonal protrusions with rounded corners.

Optionally, each rounded corner in the polygon has the same arc, and the sum of the arcs of all the rounded corners is greater than or equal to 360 degrees.

Optionally, the polygon is a regular polygon.

Optionally, the regular polygon is a square.

Optionally, the regular polygon is a regular hexagon.

Optionally, the strip-shaped protrusions are spiral protrusions.

Optionally, the strip-shaped protrusion is a square spiral protrusion with rounded corners.

Optionally, the spacing of the strip-shaped protrusions is the same.

Optionally, the widths of two adjacent protrusions are different.

Optionally, the pitches of the strip-shaped protrusions are different.

Correspondingly, the present invention also provides a liquid crystal display device, which includes a plurality of pixel units, each pixel unit includes a reflective area, and the reflective area adopts the aforementioned reflective device.

Optionally, the center is the center of the reflecting device.

Optionally, the strip-shaped protrusions are multiple concentric annular protrusions.

Optionally, the strip-shaped protrusions are multiple concentric polygonal protrusions with rounded corners.

Optionally, each rounded corner in the polygon has the same arc, and the sum of the arcs of all the rounded corners is greater than or equal to 360 degrees.

Optionally, the polygon is a regular polygon.

Optionally, the regular polygon is a square.

Optionally, the regular polygon is a regular hexagon.

Optionally, the strip-shaped protrusions are spiral protrusions.

Optionally, the strip-shaped protrusions are circular spiral protrusions.

Optionally, the strip-shaped protrusion is a square spiral protrusion with rounded corners.

Optionally, the spacing of the strip-shaped protrusions is the same.

Optionally, the widths of two adjacent protrusions are different.

Optionally, the pitches of the strip-shaped protrusions are different.

Compared with the prior art, the technical solution has the following advantages: the reflection device includes strip-shaped protrusions extending around a central direction. Since the protrusions are strip-shaped protrusions, the actual effective reflection area has a relatively large area and high reflectivity; meanwhile, the strip-shaped protrusions extend around a central direction, and the reflective device can be positioned at multiple continuous azimuth angles. Both have high reflectivity. The liquid crystal display device using the reflection device also has the above advantages.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a reflecting device in the prior art;

Fig. 2 is a top view of the reflecting device shown in Fig. 1;

Fig. 3 is the top view of another kind of prior art reflecting device;

Fig. 4 is the reflection light path analysis diagram of protrusion;

5 is a schematic diagram of a simulation of an actual effective reflection area of a reflection device in the prior art;

Fig. 6 is a schematic top view of the first embodiment of the reflection device of the present invention;

Fig. 7 is a schematic top view of the second embodiment of the reflection device of the present invention;

Fig. 8 is a schematic top view of a third embodiment of the reflection device of the present invention;

Fig. 9 is a schematic top view of a fourth embodiment of the reflection device of the present invention;

Figure 10 is a schematic diagram of the interference optical path caused by regular protrusions;

Fig. 11 is a schematic top view of the first optimized embodiment of the reflection device of the present invention;

Fig. 12 is a schematic top view of a second optimized embodiment of the reflection device of the present invention.

Detailed ways

The designer found that the strip-shaped protrusions can improve the reflectivity of the reflector, but in the prior art, the strip-shaped protrusions arranged alternately in an orthogonal manner have higher reflectivity at the orthogonal azimuth angles, but have higher reflectivity at other azimuth angles. lower. Designers are looking for a new solution to design reflectors using strip-shaped protrusions to solve the above problems while ensuring high reflectivity.

The present invention provides a reflection device, the reflection device includes a reflection layer, the reflection layer includes protrusions, and the protrusions are strip-shaped protrusions extending around a central direction. Since the protrusions are strip-shaped protrusions, the actual effective reflection area has a relatively large area and high reflectivity; meanwhile, the strip-shaped protrusions extend around a central direction, and the reflective device can be positioned at multiple continuous azimuth angles. Both have high reflectivity.

Referring to FIG. 6 , it shows a schematic top view of the first embodiment of the reflection device of the present invention. The reflective device includes a reflective layer 602 , and the reflective layer includes protrusions, and the protrusions are a plurality of concentric annular protrusions 601 . Preferably, the center of the plurality of concentric annular protrusions 601 is the center of the reflector. The width and spacing of the concentric annular protrusions 601 are the same. Since the concentric ring-shaped protrusions 601 are strip-shaped protrusions, the actual effective reflection area is large and the reflectivity is high; at the same time, the concentric ring-shaped protrusions 601 have the same or approximately the same reflective surface at any azimuth angle, and the concentric ring-shaped protrusions 601 have the same or approximately the same reflection surface at any azimuth angle. The ring-shaped protrusion 601 has high reflectivity in all directions, and has good uniformity.

Referring to FIG. 7 , it shows a schematic top view of the second embodiment of the reflection device of the present invention. The protrusions of the reflector are multiple concentric square protrusions 701 with rounded corners. Preferably, the center of the plurality of concentric square protrusions 701 is the center of the reflector. The width and spacing of the square protrusions 701 are the same. The straight sides of the square protrusions 701 form strip-shaped protrusion groups arranged vertically and horizontally, which have high reflectivity at orthogonal azimuth angles, and the four rounded corners of the square protrusions 701 can make the reflection device reflective at other azimuth angles. has a reflective surface. Preferably, the radians of the four rounded corners are the same and greater than or equal to 90 degrees, so that the reflecting device has a reflecting surface at any azimuth angle, thereby improving the uniformity of the reflecting device. Specifically, the ratio of the length of the straight side portion of the protrusion to the radius of the fillet can be adjusted to meet the design requirements of the reflecting device.

The protrusions in the reflection device of the present invention can also be deformed, such as concentric hexagons with rounded corners (as shown in Figure 8) or other concentric polygons with rounded corners, by adjusting the straight sides and rounded corners of the polygon The radius is such that the radians of each rounded corner in the polygon are the same, and the sum of the radians of the rounded corners is greater than or equal to 360 degrees. In this way, it is possible to have a reflecting surface at any azimuth angle of the reflecting device. In addition, in addition to concentric figures, the protrusions in the device of the present invention can also be spiral figures surrounding the center of the reflective surface, such as circular spiral figures or square spiral figures with rounded corners as shown in FIG. 9 . Those skilled in the art can make modifications and variations to the present invention according to the above-mentioned embodiments, which will not be described in detail here.

The reflection device provided by the present invention comprises strip-shaped protrusions extending around a central direction. Because they are strip-shaped protrusions, the area of the actual effective reflection area is large and the reflectivity is high; meanwhile, the strip-shaped protrusions have at least A reflective surface, the reflective device has a high reflectivity in all directions, and the uniformity is good.

In the above embodiments, the width and pitch of the protrusions are the same, which easily causes light interference. Referring to FIG. 10 , it shows that the incident light 801 is projected on the first protrusion and reflected, and the reflected light is 802; the incident light 803 is projected on the second protrusion and reflected, the reflected light is 804, and the optical path difference 805 of the two paths of light is expressed as d , when d=(N+1/2)×λ (N=0, 1, 2, 3...; λ is the wavelength of light), there will be interference destructive, forming a dark spot in the spot; when When d=N×λ (N=0, 1, 2, 3 . . . ; λ is the wavelength of light), there will be an interference construct, which constitutes an extremely bright point in the spot that exceeds the usual brightness. Because the width and interval of the protrusions are regular, the optical path difference 805 must appear a constructive point and a destructive point in the process of gradually increasing, and it must appear periodically and repeatedly.

Therefore, if the strip-shaped protrusions have the same width and spacing, this will cause light interference phenomenon, and human eyes will observe star-shaped interference spots, and the visual effect is not good. For this reason, the inventor further optimized the foregoing embodiments.

Referring to FIG. 11 , it shows a schematic top view of the first optimized embodiment of the reflection device of the present invention. In the third embodiment, the protrusions are also concentric ring-shaped protrusions 901 , and the difference from the first embodiment is that the width or spacing of the concentric ring-shaped protrusions 901 is different, or the width and spacing are different.

Referring to FIG. 12 , it shows a schematic top view of a second optimized embodiment of the reflection device of the present invention. In the fourth embodiment, the protrusions are concentric square protrusions 902 with rounded corners. The difference from the second embodiment is that the widths or spacings of the square protrusions 902 with rounded corners are different, or the widths and spacings are different. same.

In the optimized embodiment of the reflecting device provided by the present invention, the strip-shaped protrusions have different widths or spacings, or different widths and spacings, so that light interference can be avoided and the visual effect is good.

The present invention also provides a liquid crystal display device, which includes a plurality of pixel units, each pixel unit includes a reflection area, and the reflection area adopts the aforementioned reflection device.

Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (28)

1. A reflection device, the reflection device comprising a reflection layer, the reflection layer comprising protrusions, characterized in that the protrusions are strip-shaped protrusions extending around a central direction. 2. Reflecting device according to claim 1, characterized in that said center is the center of said reflecting device. 3. The reflection device according to claim 1, characterized in that, the strip-shaped protrusions are a plurality of concentric ring-shaped protrusions. 4. The reflection device according to claim 1, wherein the strip-shaped protrusions are a plurality of concentric polygonal protrusions with rounded corners. 5 . The reflecting device according to claim 4 , wherein each rounded corner in the polygon has the same arc, and the sum of the arcs of all the rounded corners is greater than or equal to 360 degrees. 6. The reflecting device according to claim 4, wherein the polygon is a regular polygon. 7. The reflecting device according to claim 6, wherein the regular polygon is a square. 8. The reflecting device according to claim 6, wherein the regular polygon is a regular hexagon. 9. The reflection device according to claim 1, wherein the strip-shaped protrusions are spiral-shaped protrusions. 10. The reflection device according to claim 9, characterized in that, the strip-shaped protrusions are circular spiral protrusions. 11. The reflecting device according to claim 9, wherein the strip-shaped protrusion is a square spiral protrusion with rounded corners. 12. The reflection device according to any one of claims 3, 4 or 9, characterized in that, the spacing of the strip-shaped protrusions is the same. 13. The reflecting device according to any one of claims 3, 4 or 9, characterized in that the widths of adjacent two-shaped protrusions are different. 14. The reflection device according to any one of claims 3, 4 or 9, characterized in that, the spacing of the strip-shaped protrusions is different. 15. A liquid crystal display device comprising a plurality of pixel units, each pixel unit comprising a reflection area, characterized in that the reflection area adopts the reflection device as claimed in claim 1. 16. Reflecting device according to claim 15, characterized in that said center is the center of said reflecting device. 17. The reflecting device according to claim 15, wherein the strip-shaped protrusions are multiple concentric annular protrusions. 18. The reflection device according to claim 15, wherein the strip-shaped protrusions are a plurality of concentric polygonal protrusions with rounded corners. 19. The reflecting device according to claim 18, wherein each rounded corner in the polygon has the same arc, and the sum of the arcs of all the rounded corners is greater than or equal to 360 degrees. 20. The reflecting device of claim 18, wherein the polygon is a regular polygon. 21. The reflecting device according to claim 20, wherein the regular polygon is a square. 22. The reflecting device according to claim 20, wherein the regular polygon is a regular hexagon. 23. The reflection device according to claim 15, characterized in that, the strip-shaped protrusions are spiral-shaped protrusions. 24. The reflecting device according to claim 23, wherein the strip-shaped protrusions are circular spiral protrusions. 25. The reflecting device according to claim 23, wherein the strip-shaped protrusions are square spiral protrusions with rounded corners. 26. The reflection device according to any one of claims 17, 18 or 23, characterized in that, the spacing of the strip-shaped protrusions is the same. 27. The reflecting device according to any one of claims 17, 18 or 23, characterized in that the widths of adjacent two-shaped protrusions are different. 28. The reflection device according to any one of claims 17, 18 or 23, characterized in that the distances between the strip-shaped protrusions are different.

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