TWI831558B - Decoration panel and display apparatus - Google Patents

Abstract

A decoration panel includes a first substrate, a second substrate, a cholesteric liquid crystal layer, a first light-transmitting conductive layer, a second light-transmitting conductive layer and a concave-convex lens structure. The second substrate is disposed opposite to the first substrate. The cholesteric liquid crystal layer is disposed between the first substrate and the second substrate. The first light-transmitting conductive layer is disposed between the first substrate and the cholesteric liquid crystal layer. The second light-transmitting conductive layer is disposed between the second substrate and the cholesteric liquid crystal layer. The second substrate is disposed between the concave-convex lens structure and the second light-transmitting conductive layer. The concave-convex lens structure has convex lenses and concave lenses interspersed between the convex lenses. Moreover, a display apparatus including the decoration panel is also provided.

Description

Decorative panels and display devices

The present invention relates to a photoelectric panel and a photoelectric device, and in particular to a decorative panel and a display device.

In recent years, the electric vehicle market has developed rapidly. Generally speaking, electric vehicles use very high-proportion display devices for displaying driving information and/or entertainment information. In order to create the overall atmosphere of the vehicle cabin space, a decorative panel showing decorative patterns (such as wood grain, checkerboard, etc.) may be provided above the display device. However, the decorative panels appear in different colors when viewed at different viewing angles. Decorative panels have a serious color cast problem under large viewing angles.

The invention provides a decorative panel that can improve the color shift problem under large viewing angles.

The present invention provides a display device, which includes the above-mentioned decorative panel and can improve the color shift problem under large viewing angles.

The decorative panel of the present invention includes a first substrate, a second substrate, a cholesteric liquid crystal layer, a first light-transmitting conductive layer, a second light-transmitting conductive layer and a meniscus lens structure. The second substrate is disposed opposite to the first substrate. The cholesteric liquid crystal layer is disposed between the first substrate and the second substrate. The first light-transmissive conductive layer is disposed between the first substrate and the cholesteric liquid crystal layer. The second light-transmissive conductive layer is disposed between the second substrate and the cholesteric liquid crystal layer. The second substrate is disposed between the meniscus lens structure and the second light-transmissive conductive layer. The meniscus lens structure has a plurality of convex lenses and a plurality of concave lenses interspersed between the plurality of convex lenses.

The display device of the present invention includes the above-mentioned decorative panel and display panel, wherein the decorative panel is disposed above the display panel.

10:Display device

100: Decorative panel

110: First substrate

120: Second substrate

130: Cholesterol liquid crystal layer

140: First light-transmitting conductive layer

150: Second light-transmitting conductive layer

160, 160A, 160B: Meniscus lens structure

160’: Planar structure

162:convex lens

162a, 164a: arc surface

164:concave lens

166:Connection surface

200:Display panel

c162: Convex Lens Row

c164:concave lens line

d1: first direction

d2: second direction

L: beam

LR: first color component

LY: second color component

R: unit area

I-I’: section line

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

FIG. 2 is a schematic top view of a meniscus lens structure according to an embodiment of the present invention.

FIG. 3 shows the planar structure of a comparative example and the light beam reflected by the cholesteric liquid crystal layer and passing through the planar structure.

FIG. 4 shows the meniscus lens structure and the light beam reflected by the cholesteric liquid crystal layer and passing through the meniscus lens structure according to an embodiment of the present invention.

Figure 5 shows the slightly perceptible chromaticity difference at various viewing angles for decorative panels with various lens structures or without meniscus lens structures.

Figure 6 shows the color gamut of decorative panels with various lens structures or without meniscus lens structures at various viewing angles.

FIG. 7 is a schematic top view of a meniscus lens structure according to another embodiment of the present invention.

FIG. 8 is a schematic top view of a meniscus lens structure according to another embodiment of the present invention.

Figure 9 shows the slightly perceptible chromaticity differences at various viewing angles for decorative panels with various lens structures or without meniscus lens structures.

Figure 10 shows the color gamut of decorative panels with various lens structures or without meniscus lens structures at various viewing angles.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numbers are used in the drawings and descriptions to refer to the same or similar 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, "electrical connection" or "coupling" may mean the presence of other components between two components.

As used herein, "about," "approximately," or "substantially" includes the stated value and the average within an acceptable range of deviations from the particular value as determined by one of ordinary skill in the art, taking into account the measurements in question and the A specific amount of error associated with a measurement (i.e., the limitations of the measurement system). For example, "about" may mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, this article makes The words "about", "approximately" or "substantially" can be used to select a more acceptable deviation range or standard deviation based on optical properties, etching properties or other properties, and one standard deviation does not 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 to have meanings consistent with their meanings in the context of the relevant technology and the present invention, and are not to be construed as idealistic or excessive Formal meaning, unless expressly defined as such herein.

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention. Referring to FIG. 1 , the display device 10 includes a display panel 200 and a decorative panel 100 disposed above the display panel 200 . The decorative panel 100 is used to present decorative patterns. The display panel 200 is used to display information. For example, in this embodiment, the display device 10 can be selectively applied in the vehicle field. The decorative pattern presented on the decorative panel 100 is, for example, wood grain, and the displayed information on the display panel 200 is, for example, vehicle speed, map and other driving information. However, the present invention is not limited to this. In this embodiment, the display panel 200 may be a self-luminous display panel (such as a micro light-emitting diode display panel, an organic light-emitting diode display panel, etc.) or a non-self-luminous display panel (such as a liquid crystal display panel, etc.). The invention is not limited.

The decorative panel 100 includes a first substrate 110, a second substrate 120 disposed opposite the first substrate 110, and a cholesteric liquid crystal layer 130 disposed between the first substrate 110 and the second substrate 120. The first substrate 110 and the second substrate 120 are light-transmissive. For example, in this embodiment, the material of the first substrate 110 and the second substrate 120 may be glass, quartz, organic polymer or other applicable materials, but the invention is not limited thereto. When the cholesteric liquid crystal layer 130 is in a planar state, it can reflect a specific wavelength range, and the specific wavelength range can be determined by the pitch of the cholesteric liquid crystal layer 130 .

The decorative panel 100 also includes a first light-transmissive conductive layer 140 disposed between the first substrate 110 and the cholesteric liquid crystal layer 130 . The decorative panel 100 also includes a second light-transmissive conductive layer 150 disposed between the second substrate 120 and the cholesteric liquid crystal layer 130 . For example, in this embodiment, the material of the first light-transmitting conductive layer 140 and the second light-transmitting conductive layer 150 can be metal oxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, Al-zinc oxide, indium-germanium-zinc oxide, other suitable oxides, or a stacked layer of at least two of the above, but the invention is not limited thereto.

FIG. 2 is a schematic top view of a meniscus lens structure according to an embodiment of the present invention. Figure 1 corresponds to the section line I-I' of Figure 2. Referring to FIGS. 1 and 2 , the decorative panel 100 further includes a meniscus lens structure 160 , wherein the second substrate 120 is disposed between the meniscus lens structure 160 and the second light-transmissive conductive layer 150 , and the meniscus lens structure 160 has a plurality of convex lenses 162 and a plurality of concave lenses 164 interspersed between a plurality of convex lenses 162 . In this embodiment, the meniscus lens structure 160 may optionally include a connecting surface 166 connected between the convex lens 162 and the concave lens 164; the convex lens 162 has a convex arc surface 162a relative to the connecting surface 166, and the concave lens 164 has a convex arc surface 162a relative to the connecting surface 166. The connecting surface 166 has another concave arc surface 164a. However, the present invention is not limited to this. In other embodiments, the connection surface 166 of the meniscus lens structure 160 may also be omitted.

In this embodiment, a nanoimprinting process can be optionally used on the second substrate A meniscus lens structure 160 is formed on the plate 120 . Specifically, an ink-jet printing (IJP) process or a spin-coating (spin-coating) process can be used to form a light-transmitting material layer (not shown) on the second substrate 120 (for example, but not limited to: Resin layer); then, use a mold (not shown) to imprint the light-transmissive material layer; then, use ultraviolet light to cure the imprinted light-transmissive material layer to form the meniscus lens structure 160. However, the present invention is not limited thereto. In other embodiments, other methods may also be used to form the meniscus lens structure 160 .

In this embodiment, the meniscus lens structure 160 is, for example, a light-transmitting material layer attached to the second substrate 120 . That is to say, in this embodiment, the second substrate 120 and the meniscus lens structure 160 are formed separately. However, the present invention is not limited to this. In another embodiment, the second substrate 120 and the meniscus lens structure 160 can also be formed simultaneously and integrally.

Please refer to Figures 1 and 2. For example, in this embodiment, in the top view of the decorative panel 100, a plurality of convex lenses 162 and a plurality of concave lenses 164 are alternately arranged in the first direction d1 and the second direction d2. One direction d1 and the second direction d2 are intersecting and parallel to the second substrate 120 . However, the present invention is not limited to this. In other embodiments, the convex lenses 162 and the concave lenses 164 can also be arranged in other ways.

Please refer to Figure 2. In this embodiment, within a unit area R (for example: a rectangular area of 10 μm*15 μm), the number of concave lenses 164 can optionally be equal to the number of convex lenses 162. The number of concave lenses 164 is equal to the number of convex lenses 162. The ratio of the numbers may be 1:1, that is, the ratio of the number of concave lenses 164 to the number of convex lenses 162 may be 1. However, the present invention is not limited thereto. In other embodiments, in a unit area Within R, the ratio of the number of concave lenses 164 to the number of convex lenses 162 can also be other values.

FIG. 3 shows the planar structure of a comparative example and the light beam reflected by the cholesteric liquid crystal layer and passing through the planar structure. FIG. 4 shows the meniscus lens structure and the light beam reflected by the cholesteric liquid crystal layer and passing through the meniscus lens structure according to an embodiment of the present invention.

Referring to FIGS. 1 , 3 and 4 , the light beam L reflected by the cholesteric liquid crystal layer 130 includes a first color component LR with a small reflection angle and a second color component LY with a large reflection angle. Please refer to Figures 1 and 3. The first color component LR with a small reflection angle continues to pass toward the front viewing direction after passing through the planar structure 160', and the second color component LY with a large reflection angle continues to pass through the planar structure 160'. Pass in the direction of the wide viewing angle. Please refer to FIGS. 1 and 4 . By utilizing the light-gathering characteristics of the convex lens 162 , the second color component LY with a large reflection angle is deflected when passing through the convex lens 162 and concentrated toward the front viewing direction. Utilizing the astigmatism characteristics of the concave lens 164, the first color component LR with a small reflection angle is deflected and dispersed toward a large viewing angle direction when passing through the concave lens 164. Compared with the comparative example of FIG. 3 , through the meniscus lens structure 160 having the convex lens 162 and the concave lens 164 , the first color component LR and the second color component LY of the light beam L are mixed in both the front viewing angle and wide viewing angle directions. That is to say, through the arrangement of the meniscus lens structure 160, light beams L with relatively similar color components can be received in the direction of the front viewing angle and the wide viewing angle, thereby improving the color shift problem of the decorative panel 100 in the wide viewing angle direction. For example, in this embodiment, the first color component LR and the second color component LY of the light beam L are, for example, a red component and a yellow component respectively, but the invention is not limited thereto.

，其中(

,

)為某視角下的色度，(

,

)為正視角下的色度。請參照圖1、圖2及圖5，相較於無凹凸透鏡結構、具有凹透鏡結構及具有凸透鏡結構的裝飾面板(未繪示)，具有在一個單位面積R內的凹透鏡數量與凸透鏡數量的比例為1：1的凹凸透鏡結構160的裝飾面板100在大視角(例如：60°~80°及-60°~-80°)下的恰可察覺色度差低。由此可知，透過凹凸透鏡結構160確實能有效改善裝飾面板100在大視角下的色偏問題。 Figure 5 shows the Just Noticeable Color Difference (JNCD) at various viewing angles of decorative panels with various lens structures or without meniscus lens structures. Just perceptible chromaticity difference

,in(

,

) is the chromaticity at a certain viewing angle, (

,

) is the chromaticity at the front viewing angle. Please refer to Figures 1, 2 and 5. Compared with decorative panels (not shown) without a meniscus lens structure, with a concave lens structure and with a convex lens structure, the ratio of the number of concave lenses to the number of convex lenses in a unit area R The decorative panel 100 with a 1:1 meniscus lens structure 160 has a slightly perceptible chromaticity difference under a wide viewing angle (for example: 60°~80° and -60°~-80°). It can be seen from this that the meniscus lens structure 160 can indeed effectively improve the color shift problem of the decorative panel 100 under wide viewing angles.

Figure 6 shows the color gamut of decorative panels with various lens structures or without meniscus lens structures at various viewing angles. Please refer to Figure 1, Figure 2 and Figure 6. Compared with the decorative panels (not shown) without meniscus lens structure, with concave lens structure and with convex lens structure, the ratio of the number of concave lenses to the number of convex lenses in a unit area R The decorative panel 100 with a 1:1 meniscus lens structure 160 has a wide color gamut.

It must be noted here that the following embodiments follow the component numbers and part of the content of the previous embodiments, where the same numbers are used to represent the same or similar elements, and descriptions of the same technical content are omitted. For descriptions of omitted parts, reference may be made to the foregoing embodiments and will not be repeated in the following embodiments.

FIG. 7 is a schematic top view of a meniscus lens structure according to another embodiment of the present invention. Please refer to Figure 7. In this embodiment, in the top view of the decorative panel, a plurality of convex lenses 162 are arranged in a plurality of convex lens rows c162, and a plurality of concave lenses 164 are arranged in a plurality of concave lens rows c162. The lens row c164, the plurality of convex lens rows c162 and the plurality of concave lens rows c164 are alternately arranged in the first direction d1, the plurality of convex lenses 162 of each convex lens row c162 are arranged in the second direction d2, and the plurality of concave lens rows c164 of each concave lens row c164 are arranged alternately in the first direction d1. The concave lenses 164 are arranged in the second direction d2. The meniscus lens structure 160A of FIG. 7 can be used to replace the meniscus lens structure 160 of the aforementioned display device 10 and decorative panel 100 . The display device and decorative panel formed in this manner are also within the scope of protection of the present invention.

FIG. 8 is a schematic top view of a meniscus lens structure according to another embodiment of the present invention. Please refer to FIG. 8 . In this embodiment, within a unit area R, the number of concave lenses 164 is greater than the number of convex lenses 162 . Furthermore, in this embodiment, within a unit area R, the ratio of the number of concave lenses 164 to the number of convex lenses 162 is greater than 1 and less than or equal to 5. For example, within a unit area R, in this embodiment, the ratio of the number of concave lenses 164 to the number of convex lenses 162 can be 5:1, that is, the number of concave lenses 164 to the number of convex lenses 162 The ratio of the number can be 5, but the present invention is not limited to this.

Figure 9 shows the slightly perceptible chromaticity differences at various viewing angles for decorative panels with various lens structures or without meniscus lens structures. Please refer to Figures 8 and 9. Compared with the decorative panels without meniscus lens structure, with concave lens structure and with convex lens structure (not shown), the ratio of the number of concave lenses to the number of convex lenses in a unit area R is 5: The decorative panel of the meniscus lens structure 160B has low perceptible chromaticity difference at large viewing angles (for example: 60°~80° and -60°~-80°). Within a unit area R, the number of concave lenses 164 is greater than the number of convex lenses 162, that is, it has a certain To improve the effect of large-scale character deviation.

Figure 10 shows the color gamut of decorative panels with various lens structures or without meniscus lens structures at various viewing angles. Please refer to Figures 8 and 10. Compared with the decorative panels without meniscus lens structure, with concave lens structure and with convex lens structure (not shown), the ratio of the number of concave lenses to the number of convex lenses in a unit area R is 5: The decorative panel of the meniscus lens structure 160B of 1 has a wide color gamut.

The meniscus lens structure 160B of FIG. 8 can be used to replace the meniscus lens structure 160 of the aforementioned display device 10 and decorative panel 100 . The display device and decorative panel formed in this manner are also within the scope of protection of the present invention.

10:Display device

100: Decorative panel

110: First substrate

120: Second substrate

130: Cholesterol liquid crystal layer

140: First light-transmitting conductive layer

150: Second light-transmitting conductive layer

160: Meniscus lens structure

162:convex lens

162a, 164a: arc surface

164:concave lens

166:Connection surface

200:Display panel

d1: first direction

d2: second direction

I-I’: section line

Claims (8)

A decorative panel includes: a first substrate; a second substrate disposed opposite the first substrate; a cholesteric liquid crystal layer disposed between the first substrate and the second substrate; a first light-transmitting layer a conductive layer disposed between the first substrate and the cholesteric liquid crystal layer; a second light-transmitting conductive layer disposed between the second substrate and the cholesteric liquid crystal layer; and a meniscus lens structure, wherein the second substrate is disposed between the meniscus lens structure and the second light-transmitting conductive layer, and the meniscus lens structure has a plurality of convex lenses and a plurality of concave lenses interspersed between the convex lenses; in the top view of the decorative panel, the convex lenses The concave lenses are alternately arranged in a first direction and a second direction, and the first direction and the second direction are staggered and parallel to the second substrate. The decorative panel as claimed in claim 1, wherein within a unit area, the number of the concave lenses is greater than the number of the convex lenses. The decorative panel as claimed in claim 1, wherein within a unit area, the ratio of the number of the concave lenses to the number of the convex lenses is greater than 1 and less than or equal to 5. A decorative panel includes: a first substrate; a second substrate disposed opposite the first substrate; a cholesteric liquid crystal layer disposed between the first substrate and the second substrate; a first light-transmissive conductive layer disposed between the first substrate and the second substrate between the cholesteric liquid crystal layer; a second light-transmissive conductive layer disposed between the second substrate and the cholesteric liquid crystal layer; and a meniscus lens structure, wherein the second substrate is disposed between the meniscus lens structure and the second lens structure between the photoconductive layers, and the meniscus lens structure has a plurality of convex lenses and a plurality of concave lenses interspersed between the convex lenses; in the top view of the decorative panel, the convex lenses are arranged in multiple convex lens rows, and the concave lenses are arranged in rows. into a plurality of concave lens rows, the convex lens rows and the concave lens rows are alternately arranged in a first direction, the multiple convex lenses of each convex lens row are arranged in a second direction, and the multiple concave lenses of each concave lens row are arranged in the Arranged in a second direction, the first direction and the second direction are staggered and parallel to the second substrate. A display device includes: a display panel; and a decorative panel disposed above the display panel, wherein the decorative panel includes: a first substrate; a second substrate disposed opposite to the first substrate; A cholesteric liquid crystal layer is disposed between the first substrate and the second substrate; A first light-transmitting conductive layer is provided between the first substrate and the cholesteric liquid crystal layer; a second light-transmitting conductive layer is provided between the second substrate and the cholesteric liquid crystal layer; and a meniscus lens structure, The second substrate is disposed between the meniscus lens structure and the second light-transmitting conductive layer, and the meniscus lens structure has a plurality of convex lenses and a plurality of concave lenses interspersed between the convex lenses; in the top view of the decorative panel In the invention, the convex lenses and the concave lenses are alternately arranged in a first direction and a second direction, and the first direction and the second direction are staggered and parallel to the second substrate. The display device as claimed in claim 5, wherein within a unit area, the number of the concave lenses is greater than the number of the convex lenses. The display device as claimed in claim 5, wherein within a unit area, the ratio of the number of the concave lenses to the number of the convex lenses is greater than 1 and less than or equal to 5. A display device includes: a display panel; and a decorative panel disposed above the display panel, wherein the decorative panel includes: a first substrate; a second substrate disposed opposite to the first substrate; Cholesterol liquid crystal layer is provided between the first substrate and the second substrate between; a first light-transmitting conductive layer, disposed between the first substrate and the cholesteric liquid crystal layer; a second light-transmitting conductive layer, disposed between the second substrate and the cholesteric liquid crystal layer; and a meniscus lens structure, wherein the second substrate is disposed between the meniscus lens structure and the second light-transmitting conductive layer, and the meniscus lens structure has a plurality of convex lenses and a plurality of concave lenses interspersed between the convex lenses; in the decorative panel In the top view, the convex lenses are arranged in multiple convex lens rows, and the concave lenses are arranged in multiple concave lens rows. The convex lens rows and the concave lens rows are alternately arranged in a first direction, and the multiple convex lenses in each convex lens row are Arranged in a second direction, the plurality of concave lenses in each concave lens row are arranged in the second direction, and the first direction and the second direction are intersecting and parallel to the second substrate.

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