TWI607272B - Display apparatus - Google Patents

Description

Display device

The present invention relates to a display device.

Since the electronic paper display has the advantage of power saving, it is one of the focuses in the field of display technology. The electronic paper display is a reflective display device, and therefore, when it contains a color filter, incident light and reflected light may pass through different colored filter regions. Therefore, the color electronic paper display still has some difficulties to be overcome in the production. Therefore, the currently popular electronic paper display is usually a gray-scale reflective display device.

Embodiments of the present invention can display a specific pattern on the protective layer when the display device displays an image, and the pattern on the protective layer can have a certain concealing property when the display device exhibits a dark image. When the display device is a gray scale display device, such a design can make the overall display screen of the gray scale display device not excessively monotonous, and when the gray scale display device presents a dark image, the overall screen can also exhibit a relatively uniform dark state. .

According to an embodiment of the invention, a display device includes a display module, a protective layer, and at least one discontinuous printed pattern. Display module Has a viewable area. The protective layer covers the display module. The discontinuous printed pattern is on the protective layer. The viewable area is partially covered by a discontinuous printed pattern.

According to an embodiment of the invention, a display device includes a display module, a protective layer, and at least one printed pattern. The display module has a viewable area. The protective layer covers the display module. The printed pattern is located on an area of the protective layer. The remaining area of one of the protective layers has no printed features. The area of the remaining area having no printed features is larger than the area of the area in which the printed pattern is located. The printed pattern is above the viewable area.

In the above embodiment, since the discontinuous printing pattern (for example, the inkjet printing pattern) covers a portion of the visible area, when the image is displayed in the visible area, the light forming the image can help the user perceive the discontinuous printing. pattern. In addition, when the visible area presents a dark picture (such as a black picture) compared to the pattern formed by continuous printing, the discontinuous printed pattern may have better concealment and is less likely to be perceived by the user. Therefore, it can help to make the visible area appear a more uniform dark state.

The above description is only for explaining the problems that can be solved by the present invention, the technical means for solving the problems, the effects thereof, and the like, and the specific details of the present invention will be described in detail in the following embodiments and related drawings.

100‧‧‧ display module

101‧‧‧ upper surface

102‧‧‧visible area

1022‧‧‧Local area

1024‧‧‧ remaining area

104‧‧‧Invisible area

110‧‧‧Display media layer

112‧‧‧microcapsules

1122‧‧‧Light charged particles

1124‧‧‧Dark charged particles

120‧‧‧lower substrate

130‧‧‧Upper substrate

140‧‧‧Edge colloid

200‧‧‧protection layer

202‧‧‧lower surface

2022‧‧‧Local area

2024‧‧‧Remaining area

204‧‧‧Upper surface

300, 300a, 300b‧‧‧ discontinuous printing patterns

310, 310b‧‧‧ micropattern

320‧‧‧Lighting spacers

400‧‧‧Optical adhesive layer

500‧‧‧ cover

600‧‧‧Optical adhesive layer

D‧‧‧Distance

G‧‧‧ gap

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood. 2 is a schematic enlarged view of a discontinuous printed pattern according to an embodiment of the present invention; and FIG. 3 is a comparison table of CIE color space coordinates of a discontinuous printed pattern and a continuous printed pattern; 4 is a top view of the display device shown in FIG. 1; FIG. 5 is a cross-sectional view of the display device according to another embodiment of the present invention; and FIG. 6 is a view showing another embodiment of the present invention. An enlarged schematic view of a continuous printed pattern.

The embodiments of the present invention are disclosed in the following drawings, and for the purpose of clarity However, it should be understood by those skilled in the art that the details of the invention are not essential to the details of the invention. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

1 is a cross-sectional view of a display device in accordance with an embodiment of the present invention. As shown in FIG. 1, in the present embodiment, the display device includes the display module 100, the protective layer 200, and the discontinuous printed pattern 300. The protective layer 200 covers the display module 100. The display module 100 has a viewable area 102 and a non-visible area 104. The viewable area 102 is adjacent to the non-visible area 104. For example, in some embodiments, the non-visible area 104 can surround the viewable area. 102. The "visible area" of the display module 100 described herein represents that the brightness of the area changes with the opening and closing of the display module 100. The "non-visible area" of the display module 100 described herein means that the brightness of the area does not change with the opening and closing of the display module 100, or the area changes with the brightness of the opening and closing of the display module 100. The degree is lower than the degree of brightness change of the visible area 102.

The discontinuous printed pattern 300 is located on the protective layer 200. The viewing zone 102 is partially covered by the discontinuous printed pattern 300. For example, the discontinuous printed pattern 300 covers a partial area 1022 of the viewable area 102 and does not cover the remaining area 1024 of the viewable area 102. Therefore, when the visible area 102 of the display module 100 displays an image, the light that forms the image can help the user perceive the discontinuous printed pattern 300 above the visible area 102. For example, when light from the visible region 102 reaches the discontinuous printed pattern 300, a portion of the wavelength of light may be absorbed by the discontinuous printed pattern 300, and a portion of the wavelength of light may pass through the discontinuous printed pattern 300. That is, the discontinuous printed pattern 300 may have the effect of filtering. As such, when the discontinuous printed pattern 300 receives white light from the viewing zone 102, the user can view the discontinuous printed pattern 300 of a particular color. For example, the green band of light can pass through the discontinuous printed pattern 300 so that the user can view the discontinuous printed pattern 300 that appears green. Therefore, a pattern of a specific color can be developed on the protective layer 200 by selecting the discontinuous printed pattern 300 having a specific filter band. In the embodiment in which the display module 100 is a gray scale display module, such a design can enable the overall display screen of the display device to present a pattern of other colors in addition to grayscale tones, so that the overall display image is not excessively single. Tune. Of course, such a design can also be applied to an embodiment in which the display module 100 is a color display module. For example, the display module 100 may include a color filter therein, or the display medium layer 110 of the display module 100 may include multi-color charged particles, and thus may be a color display module.

As used herein, "discontinuous printed pattern" means that the material of the printed pattern is dispersedly located on the substrate to be printed, and the material of the dispersed form can be realized by a specific printing method or by being in a printed material. Doped with additional light transmissive spacers. For example, the discontinuous printing method may be inkjet printing. Since inkjet printing can intermittently drop ink droplets, discontinuous ink droplets may be sprayed on the protective layer 200 for protection. The discontinuous printed pattern 300 is formed on the layer 200, so that when the discontinuous printed pattern 300 is formed by inkjet printing, it may also be referred to as an inkjet printed pattern. Compared with the pattern formed by the continuous printing method (such as screen printing), when the visible area 102 of the display module 100 exhibits a dark picture, the discontinuous printing pattern 300 can have better concealment, so It is not easy to be perceived by the user, but can help the visible area 102 to exhibit a relatively uniform dark state.

Referring to FIG. 2, this figure shows an enlarged schematic view of the discontinuous printed pattern 300. As shown in FIG. 2, the discontinuous printed pattern 300 formed may include a plurality of micropatterns 310 based on the characteristics of the discontinuous printing method. These micropatterns 310 can be formed, for example, by curing a plurality of discrete ink droplets ejected during inkjet printing. Since the ink droplets are intermittently ejected during the ink jet printing process, the ink droplets are scattered on the substrate to be coated (for example, the protective layer 200 shown in Fig. 1). Therefore, the micropatterns 310 after curing are separated by the gap G. With this, When the visible area 102 of the display module 100 (which can be referred to as FIG. 1 as a whole) presents a dark picture, the user can see the dark state visible area 102 under the gap G through the gap G. Therefore, the micro-patterns 310 are easily visually ignored and are not easily perceived by the user, so that the visible area 102 can exhibit a relatively uniform dark state on the user's visual experience. Since the pattern formed by the continuous printing does not have the separate micro-patterns 310, the discontinuous printing pattern 300 of the present embodiment can display a dark image when the display module 100 is displayed, compared to the pattern formed by the continuous printing. It has better concealment. The non-continuous printing pattern 300 can be achieved by any other method for forming the micro-pattern 310, and is not limited thereto.

In some embodiments, the size of such micropatterns 310 formed by discontinuous printing is micron-sized. For example, the diameter of the micropattern 310 can range from 5 microns to 80 microns, although the invention is not limited thereto. When the viewable area 102 of the display module 100 presents a dark picture, the separate micro-scale micro-patterns 310 located on the viewable area 102 can be more easily visually ignored, thereby helping to improve the presentation of the discontinuous printed pattern 300 on the display module 100. Concealment in dark pictures.

FIG. 3 is a comparison table of CIE color space coordinate values of the discontinuous printed pattern and the continuous printed pattern. The experiment in the table is an example in which a green pattern is formed on the protective layer 200 to compare the difference between the pattern formed by the discontinuous printing and the pattern formed by the continuous printing on the CIE color space coordinates. It can be understood that the discontinuous printing used in the experiments in the table is inkjet printing, and the continuous printing is screen printing. As can be seen from FIG. 3, the green pattern formed by the discontinuous printing is generated when the display module 100 presents a black image. The value of the coordinate L* of the table brightness is 14.62, and the green pattern formed by the continuous printing has a coordinate L* representing the brightness of 17.08 when the display module 100 presents a black picture. Therefore, when the display module 100 presents a black screen, the green pattern formed by the discontinuous printing can be darker than the green pattern formed by the continuous printing, and is less likely to be perceived by the user, thereby facilitating the viewing of the visible area 102. Uniform dark state.

In some embodiments, as shown in FIG. 1, the protective layer 200 has a lower surface 202 and an upper surface 204. The lower surface 202 is opposite the upper surface 204. Specifically, the lower surface 202 is the surface of the protective layer 200 closest to the display module 100, and the upper surface 204 is the surface of the protective layer 200 that is farthest from the display module 100. The discontinuous printed pattern 300 can be located in a partial region 2022 of the lower surface 202 of the protective layer 200 and does not cover the remaining region 2024 of the lower surface 202. In the manufacturing process, ink droplets may be intermittently sprayed on the partial region 2022 of the lower surface 202 of the protective layer 200 by inkjet printing, for example, to form the second region 2022 of the lower surface 202 as shown in FIG. The micropattern 310 forms a discontinuous printed pattern 300 in a partial region 2022 of the lower surface 202.

Since the discontinuous printed pattern 300 is located on the lower surface 202 of the protective layer 200, the discontinuous printed pattern 300 can be relatively far from the user when the user views the display device from above the display device. Therefore, when the display module 100 presents a dark image, such a design can help the discontinuous printed pattern 300 to be more easily ignored, thereby further enhancing the concealment of the discontinuous printed pattern 300 when the display module 100 presents a dark image. Sex.

In some embodiments, as shown in FIG. 1, the display device further An optical adhesive layer 400 can be included. The optical adhesive layer 400 is disposed between the display module 100 and the protective layer 200 , and the optical adhesive layer 400 can adhere to the lower surface 202 of the display module 100 and the protective layer 200 . The discontinuous printed pattern 300 can be covered by the optical adhesive layer 400, so that the discontinuous printed pattern 300 and the display module 100 can be separated by the optical adhesive layer 400 such that the discontinuous printed pattern 300 is separated from the display module 100. Distance D. In some embodiments, this distance D is on the order of microns. For example, the distance D can range from 1 micron to 200 microns. With the micrometer-scale distance D, the discontinuous printed pattern 300 can be closer to the display module 100 than to the upper surface 204 of the protective layer 200. As such, when the user views the display device, the discontinuous printed pattern 300 can be further away from the user to further enhance the concealment of the discontinuous printed pattern 300 when the display module 100 presents a dark image.

In some embodiments, the discontinuous printed pattern 300 has no distance from the display module 100. That is, the discontinuous printed pattern 300 can contact the display module 100. For example, the ink droplets may be intermittently sprayed on a partial area of the upper surface 101 of the display module 100 by inkjet printing to form a second image in a partial region of the upper surface 101 of the display module 100. The micropattern 310 is shown to form a discontinuous printed pattern 300 in a partial region of the upper surface 101. Since the discontinuous printed pattern 300 is formed on the upper surface 101 of the display module 100, when the user views the display device, the discontinuous printed pattern 300 can be further away from the user to further enhance the discontinuous printing. The pattern 300 is concealed when the display module 100 presents a dark picture.

Since the remaining area 1024 of the viewable area 102 is not discontinuous The printed image 300 is covered, so that the display image of the remaining area 1024 is not affected or blocked by the discontinuous printed pattern 300. Moreover, in some embodiments, the remaining area 2024 of the lower surface 202 of the protective layer 200 is not printed with filtering features such as ink or other filter material and the area of the remaining area 2024 is greater than the portion of the discontinuous printed pattern 300. The area of the area 2022 prevents excessive display of the displayed image of the viewable area 102. That is, the local area 2022 where the discontinuous printed pattern 300 is located does not affect the display image of the overall remaining area 1024 of the visible area 102, for example, to produce a filtering effect.

In some embodiments, the display module 100 can include a display medium layer 110. The display medium layer 110 is capable of displaying an image, so that the area occupied by the display medium layer 110 can be defined as the visible area 102. The display medium layer 110 is partially covered by the discontinuous printed pattern 300. For example, the projection of the display medium layer 110 on the lower surface 202 of the protective layer 200 may overlap the discontinuous printed pattern 300. That is, the projected area of the discontinuous printed pattern 300 on the lower surface 202 is smaller than the projected area of the display medium layer 110 on the lower surface 202, and the projection of the discontinuous printed pattern 300 on the lower surface 202 is at the lower surface 202 of the display medium layer 110. Inside the projection. Thereby, the discontinuous printed pattern 300 shields part of the display medium layer 110, and the remaining portion of the display medium layer 110 is not obscured by the discontinuous printed pattern 300, so the remaining portion of the display medium 110 is displayed. It is not affected or blocked by the discontinuous printed pattern 300.

In some embodiments, the display medium layer 110 can be a bistable display medium layer, such as an electrophoretic layer, a cholesteric liquid crystal layer, or other suitable double The steady state shows the dielectric layer. Taking the electrophoretic layer as an example, the display medium layer 110 may include a plurality of microcapsules 112. Each of the microcapsules 112 includes a plurality of light colored charged particles 1122 and a plurality of dark colored charged particles 1124 that are different in charge therefrom, and the positions of the charged particles can be controlled by an electric field to cause the display medium layer 110 to display a gray scale image.

In embodiments where the display medium layer 110 is an electrophoretic layer, one or more of the microcapsules 112 may be covered by the discontinuous printed pattern 300, while the remaining microcapsules 112 are not covered by the discontinuous printed pattern 300. When the microcapsules 112 covered by the discontinuous printed pattern 300 are in a bright state (i.e., when the pale charged particles 1122 are positioned over the dark charged particles 1124), the reflected light from a portion of the wavelength of the microcapsules 112 may pass through The pattern 300 is continuously printed so that the user can view the discontinuous printed pattern 300 of a particular color. When the display module 100 presents a dark image, all of the microcapsules 112 will assume a dark state (ie, the dark charged particles 1124 are located above the lightly charged particles 1122), and the user can pass between the plurality of micropatterns 310. The gap G (see Fig. 2) views the dark state microcapsules 112 below the gap G. Therefore, the micro-patterns 310 are relatively easy to be visually ignored, and can help the visible area 102 to exhibit a relatively uniform dark state on the user's visual experience.

In some embodiments, the display module 100 further includes a lower substrate 120 and an upper substrate 130. The display dielectric layer 110 is located between the lower substrate 120 and the upper substrate 130, and can be controlled by the electric field generated by the lower substrate 120 and the upper substrate 130. For example, the lower substrate 120 may be a thin film transistor array substrate, and the upper substrate 130 may have a common electrode layer. The electric field generated by the common electrode layer of the pixel electrode on the thin film transistor array substrate and the upper substrate 130 may affect the microcapsule. The position of the lightly charged particles 1122 and the dark charged particles 1124 in 112.

In some embodiments, the display module 100 further includes an edge colloid 140. The edge colloid 140 surrounds the display medium layer 110 to seal the display medium layer 110 between the lower substrate 120 and the upper substrate 130. Since there is no display medium in the edge colloid 140, the non-visible area 104 of the display module 100 can be defined by the edge colloid 140. In addition, since the discontinuous printed pattern 300 is located within the viewable area 102 and outside of the non-visible area 104, the edge colloid 140 is not covered by the discontinuous printed pattern 300.

In some embodiments, as shown in FIG. 2, the micropatterns 310 are of the same color, that is, between the two micropatterns 310 of the same color, and do not have printed matter of different colors from the two micropatterns 310. For example, there may be no non-green (eg, red, blue, or yellow) ink or other printed material between the two green micropatterns 310. Thereby, the discontinuous printed pattern 300 formed by the micropatterns 310 can exhibit a monochrome pattern.

Fig. 4 is a top view of the display device shown in Fig. 1. As shown in FIG. 4, in some embodiments, the number of discontinuous printed patterns 300 is plural. The discontinuous printed patterns 300 are all located in the visible area 102, so that a certain color pattern can be presented when the visible area 102 displays an image. The shape, color or a combination of such discontinuous printed patterns 300 can be designed as desired. For example, at least two of the discontinuous printed patterns 300 are different in shape; or at least two of the discontinuous printed patterns 300 are different in color; or at least two of the discontinuous printed patterns 300 are different in shape and color. Such a design can help the user to discern the two discontinuous printed patterns 300. Therefore, in some embodiments, when the display device includes a touch panel (not shown), the two distinguishable discontinuous print patterns 300 can be targeted. Provide different touch functions. For example, when the user touches a partial area of the touch panel above the discontinuous printed pattern 300 on the left side of FIG. 4, the touch panel can provide a control signal to the processor (not shown). The processor can open the previously browsed webpage according to the control signal and display it in the visible area 102; when the user touches a partial area of the touch panel above the discontinuous printed pattern 300 in the middle of FIG. 4, The touch panel can provide another control signal to the processor, and the processor can control the visible area 102 to display the desktop screen according to the control signal.

In some embodiments, the protective layer 200 has anti-ultraviolet light characteristics, waterproof features, or a combination thereof. For example, the surface of the protective layer 200 may be coated with an ultraviolet resistant material or a waterproof material. The material of the protective layer 200 may be polyethylene terephthalate (PET), polycarbonate (PC), polymethyl acrylate (PMMA) or other suitable light-transmissive protective materials, but the present invention does not limit.

In some embodiments, as shown in FIG. 1, the display device may further include a cover plate 500. The cover plate 500 covers the protective layer 200. For example, the display device can also include an optical adhesive layer 600. The optical adhesive layer 600 is located between the cover 500 and the protective layer 200 and adheres to the upper surface 204 of the cover 500 and the protective layer 200. As such, the cover 500 can protect the protective layer 200 and the display module 100 underneath. In some embodiments, the material of the cover plate 500 can be a light transmissive plastic, glass or other suitable light transmissive material.

Figure 5 is a cross-sectional view showing a display device in accordance with another embodiment of the present invention. As shown in FIG. 5, the main difference between the embodiment and the embodiment shown in FIG. 1 is that the discontinuous printed pattern 300a is located on the upper surface 204 of the protective layer 200 and covers a partial area of the visible area 102. 1022. Thus, when the display module 100 displays an image, light from the localized region 1022 of the viewing zone 102 can help cause the discontinuous printed pattern 300a above it to assume a particular color. In addition, as with the discontinuous printed pattern 300, the discontinuous printed pattern 300a of the present embodiment also has a plurality of separate micropatterns. Therefore, when the display module 100 presents a dark image, the discontinuous printed pattern 300a is more continuous than the continuous pattern. The printed pattern has better concealment. The specific details of the discontinuous printed pattern 300a are as described in the aforementioned discontinuous printed pattern 300, and the description will not be repeated. In the present embodiment, the cover 500 may cover the discontinuous printed pattern 300a. Further, the discontinuous printed pattern 300a may be located between the protective layer 200 and the cover 500 and covered by the optical adhesive layer 600 between the protective layer 200 and the cover 500.

FIG. 6 is an enlarged schematic view showing a discontinuous printed pattern 300b according to another embodiment of the present invention. The main difference between the present embodiment and the foregoing embodiment is that the discontinuous printed pattern 300b according to the present embodiment may include a plurality of transparent spacers 320. These light transmissive spacers 320 may separate the micropattern 310b. As such, the light-transmitting spacers 320 can increase the distance between the micro-patterns 310b, so that when the visible area 102 (see FIG. 1) presents a dark picture, the user can more easily view the dark state under the discontinuous printed pattern 300b. Visible area 102. In some embodiments, the size of the light-transmissive spacers 320 is larger than the size of the micro-patterns 310b to further increase the distance between the micro-patterns 310b, and further enhance the discontinuous printed pattern 300b when the display module presents a dark image. Concealment.

In some embodiments, the light transmissive spacer 320 can be a body having a diameter greater than a diameter of the micropattern 310b, for example, the light transmissive sphere The diameter may range from about 1 micron to about 80 microns, although the invention is not limited thereto. In some embodiments, the material of the light transmissive spacer 320 may be glass, light transmissive plastic, or other suitable light transmissive material. An exemplary formation of the discontinuous printed pattern 300b may be: doping a plurality of solid transparent spacers 320 into a liquid ink, and applying an ink doped with a plurality of light transmissive spacers 320 to the protection. On layer 200. After the liquid ink is cured to form the plurality of micropatterns 310b, the plurality of light transmissive spacers 320 may separate the micropatterns 310b.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧ display module

101‧‧‧ upper surface

102‧‧‧visible area

1022‧‧‧Local area

1024‧‧‧ remaining area

104‧‧‧Invisible area

110‧‧‧Display media layer

112‧‧‧microcapsules

1122‧‧‧Light charged particles

1124‧‧‧Dark charged particles

120‧‧‧lower substrate

130‧‧‧Upper substrate

140‧‧‧Edge colloid

200‧‧‧protection layer

202‧‧‧lower surface

2022‧‧‧Local area

2024‧‧‧Remaining area

204‧‧‧Upper surface

300‧‧‧ discontinuous printed pattern

400‧‧‧Optical adhesive layer

500‧‧‧ cover

600‧‧‧Optical adhesive layer

D‧‧‧Distance

Claims (16)

A display device comprising: a display module having a visible area; a protective layer covering the display module; and at least one discontinuous printed pattern on the protective layer, wherein the visible area is partially Covered by a continuous print pattern. The display device of claim 1, wherein the protective layer has a surface closest to the display module, and the discontinuous printed pattern is located on the surface of the protective layer. The display device of claim 2, wherein the discontinuous printed pattern is located in an area of the surface of the protective layer, and a remaining area of the surface has no filter features. The display device of claim 1, wherein the distance between the discontinuous printed pattern and the display module is between 1 micrometer and 200 micrometers. The display device of claim 1, wherein the protective layer has a surface farthest from the display module, and the discontinuous printed pattern is located on the surface of the protective layer. The display device of claim 5, wherein the discontinuous printed pattern is located in an area of the surface of the protective layer, and the table The remaining area of one of the faces does not have a filter feature. The display device of claim 5, further comprising: a cover plate, wherein the discontinuous printed pattern is located between the cover plate and the protective layer. The display device of claim 1, wherein the discontinuous printed pattern comprises a plurality of micropatterns, the micropatterns being separated, and the micropatterns having a diameter of between 5 micrometers and 80 micrometers. The display device of claim 8, wherein the micropatterns are of the same color. The display device according to claim 8, wherein the micro-patterns of any two of the same colors do not have prints of different colors from the micro-patterns. The display device of claim 8, further comprising: at least one light-transmitting spacer separating the micro-patterns. The display device of claim 11, wherein the light transmissive spacer has a size larger than a size of at least one of the micro patterns. The display device of claim 1, wherein the number of the at least one discontinuous printing pattern is plural, and the discontinuous printing The shape, color or combination of the patterns are different. The display device of claim 1, wherein the display module comprises a display medium layer defining the visible area, the discontinuous printed pattern covering a portion of the display medium layer. A display device comprising: a display module having a viewing area; a protective layer covering the display module; and at least one inkjet printing pattern on an area of the protective layer, the inkjet printing pattern being a a discontinuous printed pattern having a remaining area of the protective layer having no printed features, an area of the remaining area having no printed features having an area greater than an area of the area in which the inkjet printed pattern is located, and the inkjet printed pattern is located above the visible area . The display device of claim 15, wherein the protective layer has a surface facing the display module, the inkjet printed pattern being located on the surface of the protective layer.