TWI869135B - Hidden display - Google Patents

Abstract

A hidden display includes a display panel, a transparent substrate, and a decoration layer. The transparent substrate is disposed on the display panel. The decoration layer is disposed on a surface of the transparent substrate. The decoration layer includes a plurality of openings, and the distribution of the openings meets the following conditions. The plurality of openings includes a set of opening sequences arranged along a direction. The projections of the centers of two adjacent openings in the opening sequence on one coordinate axis have a first projection difference, the projections of the centers of other two adjacent openings in the opening sequence on the coordinate axis have a second projection difference, and the difference between the first projection difference and the second projection difference is greater than 20 micrometers.

Description

Hidden display

The present invention relates to a hidden display, in particular to a hidden display having a surface with decorative patterns and openings.

With the development of technology, displays have been widely used in all aspects of life. For example, car displays are installed in vehicles to provide vehicle information, road information, contact information, navigation information, etc. Traditional car displays are set on the center console. When not lit, the screen is black, which is more abrupt in the vehicle interior. In order to make the car display have an integrated appearance with the interior, the industry tries to provide hidden displays that can match the vehicle interior. However, in existing hidden displays, due to their structural design problems, the displayed screen will have moiré, so the industry still needs to continue research and development to provide hidden displays that can match the vehicle interior and have good display effects.

One of the purposes of the present invention is to provide a hidden display, the decorative layer on the surface of which has a plurality of openings, and the distribution of the openings has a special design, so that the hidden display can have good display quality when displaying images.

The present invention provides a hidden display, which includes a display panel, a transparent substrate, and a decorative layer. The transparent substrate is disposed on the display panel. The decorative layer is disposed on the surface of the transparent substrate, wherein the decorative layer includes a plurality of openings. The distribution positions of the openings meet the following conditions: the openings include a set of opening sequences distributed along a direction, the projections of the opening centers of two adjacent openings in the opening sequence on a coordinate axis have a first projection difference, the projections of the opening centers of the other two adjacent openings in the opening sequence on the coordinate axis have a second projection difference, and the difference between the first projection difference and the second projection difference is greater than 20 micrometers (μm).

With the above-mentioned hole distribution design, when the display panel is not lit, the holes are not easily visible from the surface of the decorative layer, and the display panel can be hidden in the pattern of the decorative layer; when the display panel is lit, the displayed image can be clearly displayed on the display side of the hidden display, and is not easily disturbed by the pattern of the decorative layer, and is not easy to produce moiré.

100: Hidden display

110: Display panel

110R: Display area

112: First substrate

114: Second substrate

115: Luminescent layer

116: Display media layer

118: Circuit layer

120: Transparent substrate

120a, 130a: upper surface

130:Decorative layer

132: Opening

132r: Opening radius

140: Light source

A1,A2,A3,A4,A5,A6,A1’,A2’,A3’,A4’,A1”,A2”,A3”,A4”,A5”: selected openings

d1,d2,d3,d4,d5,d6,d7,d8: Difference

D1,D2,D3: Direction

DC:Decorative pattern

Dr: Sequence direction

DS: Display Side

EL: Light

IM:Image

MO: Moiré

O: Origin

P ₁ ,P ₂ ,P ₃ ,P ₄ ,P ₅ ,P ₆ ,P ₁ ',P ₂ ',P ₃ ',P ₄ ': vector

P _1,x ,P _{2,x ,} P _3,x ,P 4,x ,P _{1,y ,} P _2,y ,P 3,y ,P _4,y ,P _1,x ',P _2,x ',P _1,y ',P _2,y ',P _3,y ',P _4,y ': Projection amount

PX: Sub-pixel

RL1,RL2,RL3: Reference lines

R: Radius of curvature

X: horizontal axis

Y: vertical axis

Figure 1 is a partial cross-sectional schematic diagram of the first embodiment of the hidden display of the present invention.

Figure 2 shows the appearance of the hidden display of the present invention when no image is displayed.

Figure 3 shows the appearance of the hidden display of the present invention when displaying a picture.

Figure 4 is a partially enlarged top view of the first embodiment of the hidden display of the present invention.

Figure 5 is another partially enlarged top view schematic diagram of the first embodiment of the hidden display of the present invention.

Figure 6 is another partially enlarged top view schematic diagram of the first embodiment of the hidden display of the present invention.

Figure 7 is a schematic diagram of the display screen of the hidden display of the present invention and the comparative example.

Figure 8 is a partial cross-sectional schematic diagram of a modified embodiment of the first embodiment of the hidden display of the present invention.

Figure 9 is a partial schematic diagram of the second embodiment of the hidden display of the present invention.

Figure 10 is a partial schematic diagram of a modified embodiment of the second embodiment of the hidden display of the present invention.

The content of the present invention is described in detail below in conjunction with specific embodiments and drawings. In order to make the content of the present invention clearer and easier to understand, the drawings below may be simplified schematic diagrams, and the components therein may not be drawn to scale. In addition, the number and size of each component in the drawings are for illustration only and are not intended to limit the scope of the present invention.

Please refer to FIG. 1 to FIG. 3, wherein FIG. 1 is a partial cross-sectional schematic diagram of the first embodiment of the hidden display of the present invention, and FIG. 2 and FIG. 3 are top view schematic diagrams of the first embodiment of the hidden display of the present invention, wherein FIG. 2 shows the appearance of the hidden display when no picture is displayed, and FIG. 3 shows the appearance of the hidden display when the picture is displayed. The hidden display 100 of the present invention can be applied to a vehicle as a vehicle display, but is not limited thereto. The hidden display 100 can be applied to any device or equipment in which a hidden display is to be installed. According to the present invention, the hidden display 100 includes a display panel 110, a transparent substrate 120, and a decorative layer 130. The transparent substrate 120 is disposed on the display panel 110, and the decorative layer 130 is disposed on the surface of the transparent substrate 120, for example, on the upper surface 120a of the transparent substrate 120, so that the transparent substrate 120 is located between the decorative layer 130 and the display panel 110, but not limited thereto. In a variant embodiment, the decorative layer 130 may be disposed on the lower surface of the transparent substrate 120, so that the decorative layer 130 is located between the transparent substrate 120 and the display panel 110. The decorative layer 130 includes a plurality of openings 132. Specifically, the openings 132 may be micro-perforations that penetrate the decorative layer 130 from the upper surface 130a of the decorative layer 130 to the lower surface of the decorative layer 130. The transparent substrate 120 can be used as a cover plate of the hidden display 100 to protect the display panel 110. The material of the transparent substrate 120 may include, for example, glass, quartz, sapphire, ceramic, polyimide (PI), polycarbonate (PC), polyethylene terephthalate (PET), other suitable materials or combinations of the above materials, but is not limited to the above. The decorative layer 130 may include any material that can provide a predetermined pattern, pattern and/or decoration, such as an ink material, and the decorative layer 130 may be a single layer or a composite layer structure. As shown in FIG. 2, the upper surface 130a of the decorative layer 130 on the surface of the hidden display 100 serves as the display side of the hidden display 100. The surface of the decorative layer 130 has a decorative pattern DC. When the display panel 110 is in a closed state or in a standby state, it will not emit light to display the image. At this time, the upper surface 130a of the decorative layer 130 can present a complete and consistent decorative pattern DC in terms of visual effect, and the presentation of the pattern is not easily affected by the setting of the opening 132.

Furthermore, when the display panel 110 is turned on, the display area 110R thereof generates light EL, which can be emitted generally along the direction D1, passing through the transparent substrate 120 and the opening 132, so as to display the image on the display side of the hidden display 100. In this case, the decorative pattern DC of the decorative layer 130 will fade or even disappear in the user's vision, and will not affect the image displayed by the display panel 110. As shown in FIG. 3, the display side of the hidden display 100 can clearly display an image IM, and the decorative pattern DC on the surface of the decorative layer 130 is not easy to see in the image IM. The direction D1 may be parallel to the normal direction of the upper surface 120a of the transparent substrate 120, or may be parallel to the stacking direction of the decorative layer 130, the transparent substrate 120 and the display panel 110.

Please refer to Figure 4, which is a partially enlarged top view of an embodiment of the hidden display of the present invention, in which the decorative pattern of the decorative layer is omitted. In order to achieve the above effect, the openings 132 in the decorative layer 130 of the present invention have a specific distribution method and meet the following conditions. When a virtual coordinate system is set on the surface of the decorative layer 130, it has an origin O and a coordinate axis, such as the horizontal axis X, and a set of opening sequence A is selected from the plurality of openings 132, wherein the opening sequence A includes a plurality of selected openings, such as selected opening A1, selected opening A2, selected opening A3, selected opening A4, selected opening A5 and selected opening A6, which are generally distributed along a direction (i.e., the sequence direction Dr), and the projections of the opening centers of two adjacent selected openings in the opening sequence A on the coordinate axis have a first projection difference, and the projections of the opening centers of the other two adjacent selected openings in the opening sequence A on the coordinate axis have a second projection difference, wherein the difference between the first projection difference and the second projection difference is greater than 20 micrometers (μm). Among them, the openings 132 in the opening sequence A meet the following conditions: the openings 132 in the opening sequence A include two adjacent reference openings, the extension line of the line connecting the opening centers of the reference openings is defined as a reference line RL1 extending along the sequence direction Dr, and the shortest distance between the opening centers of other openings 132 in the opening sequence A and the extension line RL1 is less than or equal to the opening radius of the opening 132.

In detail, the opening 132 may have substantially the same size and shape (e.g., circular), and has an opening radius 132r. The origin O of the virtual coordinate system may be set at any position of the decorative layer 130 corresponding to the display area 110R, and the coordinate axis may be a straight line axis passing through the origin O and parallel to any direction. FIG. 4 shows, for example, that the origin O is set at the lower left corner of the transparent substrate 120, and the straight line axis is the horizontal axis X parallel to the direction D2, but the present invention is not limited thereto. The method for selecting the aperture sequence A may include: setting a reference line RL1, which at least extends through the aperture centers of any two adjacent apertures 132, and the extension direction of the reference line RL1 is the sequence direction Dr, for example, using the selected apertures A1 and the selected apertures A2 as reference apertures, so that the reference line RL1 extends through the aperture centers of the selected apertures A1 and the selected apertures A2; and selecting the apertures 132 from the plurality of apertures 132. In the method, a plurality of openings 132 adjacent to the reference line RL1 are selected as the opening sequence A. The selection principle is to select other openings 132 whose shortest distance from the reference line RL1 is less than or equal to the opening radius 132r along the reference line RL1, such as the selected opening A3, the selected opening A4, the selected opening A5 and the selected opening A6, so as to obtain the opening sequence A further including the selected opening A1 and the selected opening A2. The shortest distance refers to the shortest vertical distance from the opening center of the opening 132 to the reference line RL1. As can be seen from the above, the definition of the opening 132 adjacent to the reference line RL1 is that the shortest distance from the opening center to the reference line RL1 is less than or equal to the opening radius 132r. Therefore, each opening 132 in the opening sequence A will at least partially overlap with the reference line RL1, for example, the edge of the selected opening is aligned with the reference line RL1 or the reference line RL1 passes through the selected opening. The above-mentioned method for selecting a set of opening sequences, the definition of the opening adjacent to the reference line, and the definition of the shortest distance between the opening and the reference line are applicable to other embodiments and variant embodiments of the present invention. A vector P ₁ is pointed from the origin O to the center position of the selected opening A1, a vector P ₂ is pointed from the origin O to the center position of the selected opening A2, a vector P ₃ is pointed from the origin O to the center position of the selected opening A3, a vector P ₄ is pointed from the origin O to the center position of the selected opening A4, a vector P ₅ is pointed from the origin O to the center position of the selected opening A5, and a vector P ₆ is pointed from the origin O to the center position of the selected opening A6. The projection of vector P ₁ on the horizontal axis X is P _1,x , the projection of vector P ₂ on the horizontal axis X is P _2,x , the projection of vector P ₃ on the horizontal axis X is P _3,x , the projection of vector P ₄ on the horizontal axis X is P _4,x , and so on. From the selected openings, any two groups of adjacent selected openings are selected to calculate the difference in their projections on the horizontal axis X, and then the difference between the two is calculated. For example, one group selects selected opening A1 and the adjacent selected opening A2, and the other group selects selected opening A3 and the adjacent selected opening A4. The difference between the projection amount P _1,x and the projection amount P _2,x is defined as a first projection difference ΔP _1,x (represented by difference d1 in FIG. 4 ), and the difference between the projection amount P _3,x and the projection amount P _4,x is defined as a second projection difference ΔP _3,x (represented by difference d2 in FIG. 4 ). Moreover, according to the design of the opening 132 of the present invention, the difference between the first projection difference ΔP _1,x and the second projection difference ΔP _3,x is greater than 20 micrometers (μm), that is, the opening 132 of the present invention meets the design condition |ΔP _1,x -ΔP _3,x |>20μm. The above-mentioned group of two "adjacent" openings 132 means that the distance between the two openings 132 is very small or has a minimum distance, or it can be indicated that there is no other opening 132 between the two openings 132 in a direction. The above-mentioned meaning of "adjacent" can be applied to other paragraphs of this specification and will not be repeated.

In other words, according to the present invention, in the same opening sequence, the i-th opening and the adjacent i+1-th opening can be selected from all the selected openings to calculate their projection difference on the coordinate axis (taking the horizontal axis X as an example) as the first projection difference ΔP _i,x , and another j-th opening and the adjacent j+1-th opening can be selected from the selected openings to calculate their projection difference as the second projection difference ΔP _j,x , and |ΔP _i,x -ΔP _j,x |>20μm, where |ΔP _i,x -ΔP _j,x | can be called the projection difference variation condition, also known as "ΔP difference".

On the other hand, the virtual coordinate system set on the surface of the decorative layer 130 can also be a two-dimensional coordinate system, which has a horizontal axis X and a vertical axis Y, which are parallel to the direction D2 and the direction D3 respectively, and the horizontal axis X and the vertical axis Y are, for example, perpendicular to each other. In addition to satisfying the aforementioned projection difference variation condition on the horizontal axis X, the configuration of the opening 132 can also satisfy similar projection difference variation conditions on the vertical axis Y. For example, the selected opening A1 and the adjacent selected opening A2 have a projection amount P _1,y and a projection amount P _2,y on the longitudinal axis Y, respectively, and there is a third projection difference ΔP _1,y (represented by the difference d3 in Figure 4) between the two, the selected opening A3 and the adjacent selected opening A4 have a projection amount P _3,y and a projection amount P _4,y on the longitudinal axis Y, respectively, and there is a fourth projection difference ΔP _3,y (represented by the difference d4 in Figure 4), and the difference between the third projection difference ΔP _1,y and the fourth projection difference ΔP _3,y is greater than 20 microns, that is, the opening 132 of the present invention meets the design condition |ΔP _1,y -ΔP _3,y |>20μm.

In other words, according to the present invention, when the set virtual coordinate system is a two-dimensional coordinate system, among the selected openings, the i-th opening and the adjacent i+1-th opening can be selected to calculate their projection difference on another coordinate axis (taking the longitudinal axis Y as an example) as the third projection difference ΔP _i,y , and another j-th opening and the adjacent j+1-th opening can be selected from the selected openings to calculate their projection difference as the fourth projection difference ΔP _j,y , and |ΔP _i,y -ΔP _j,y |>20μm, where |ΔP _i,x -ΔP _j,x | can also be called the projection difference variation condition, also known as "ΔP difference".

Please refer to FIG. 5, which is another partially enlarged top view schematic diagram of the first embodiment of the hidden display of the present invention, which illustrates the selection of another set of opening sequences and the calculation of the projection difference variation condition. As shown in FIG. 5, a two-dimensional coordinate system is set on the decorative layer 130, including an origin O and a first coordinate axis (i.e., the horizontal axis X) and a second coordinate axis (i.e., the vertical axis Y). The origin O can be located at any point in the decorative layer 130, such as but not limited to the center of the corresponding display area 110R (not shown in FIG. 5), and the first coordinate axis and the second coordinate axis can divide the decorative layer 130 into four quadrants. When selecting another set of opening sequence A', a reference line RL2 can be set on the decorative layer 130, which passes through the centers of at least two adjacent reference openings (for example, the selected opening A3' and the selected opening A4') and extends along a direction, which is regarded as the sequence direction Dr. Then, from the plurality of openings 132, the other plurality of openings 132 (for example, the selected opening A1' and the selected opening A2') adjacent to the reference line RL2 are selected to form the set of opening sequence A' together with the selected opening A3' and the selected opening A4', wherein the shortest distances of the selected opening A1' and the selected opening A2' to the reference line RL2 are respectively less than or equal to the opening radius 132r. There is a vector P ₁ 'from the origin O to the center of the selected opening A1', there is a vector P ₂ 'from the origin O to the center of the selected opening A2', there is a vector P ₃ 'from the origin O to the center of the selected opening A3', and there is a vector P ₄ 'from the origin O to the center of the selected opening A4'. The projection of vector P ₁ 'on the horizontal axis X is P _1,x ', the projection of vector P ₂ 'on the horizontal axis X is P _2,x ', the projection of vector P ₃ 'on the horizontal axis X is P _3,x ', and the projection of vector P ₄ 'on the horizontal axis X is P _4,x '. Similarly, from the selected openings, two groups of adjacent selected openings are selected to calculate the difference in their projections on the horizontal axis X, and then the difference between the two is calculated. For example, one group selects the selected opening A1' and the adjacent selected opening A2', and the other group selects the selected opening A3' and the adjacent selected opening A4'. The difference between the projection amount _P1,x ' and the projection amount _P2,x ' is defined as a first projection difference ΔP1 _,x ' (represented by difference d5 in FIG. 5), and the difference between the projection amount P3 _,x ' and the projection amount P4 _,x ' is defined as a second projection difference _ΔP3,x ' (represented by difference d6 in FIG. 5). Moreover, according to the design of the opening 132 of the present invention, the difference between the first projection difference _ΔP1,x ' and the second projection difference _ΔP3,x ' is greater than 20 microns, that is, the opening 132 of the present invention meets the design condition | _ΔP1,x' - _ΔP3,x '|>20μm.

Similarly, in the above selected opening sequence A', each selected opening also satisfies the projection difference variation condition on the longitudinal axis Y. For example, the selected opening A1' and the adjacent selected opening A2' have projection amounts _P1,y ' and _P2,y ' on the longitudinal axis Y, respectively, and there is a third projection difference _ΔP1,y ' (represented by the difference d7 in Figure 5) between the two. The selected opening A3' and the adjacent selected opening A4' have projection amounts _P3,y ' and P4 _,y ' on the longitudinal axis Y, respectively, and there is a fourth projection difference _ΔP3,y ' (represented by the difference d8 in Figure 5), and the difference between the third projection difference _ΔP1,y ' and the fourth projection difference _ΔP3,y ' is greater than 20 microns, that is, the opening 132 of the present invention meets the design condition |ΔP1 _,y' - _ΔP3,y '|>20μm.

Please refer to FIG. 6 , which is another partially enlarged top view schematic diagram of the first embodiment of the hidden display of the present invention, and illustrates another method for selecting a set of opening sequences. As shown in Figure 6, when selecting another set of opening sequence A", any two adjacent openings 132 (for example, selected opening A1" and selected opening A2") can be selected on the decorative layer 130 as reference openings, and the extension line of the center line connecting the two adjacent openings 132 is set as the reference line RL3, and its extension direction is defined as the sequence direction Dr. Then, from the plurality of openings 132, several openings 132 adjacent to the reference line RL3 are selected as the set of opening sequence, for example, including the selected opening A1", the selected opening A2", the selected opening A3", the selected opening A4" and the selected opening A5", wherein the definition of "adjacent" means that the shortest vertical distance between the opening center of the opening 132 and the reference line RL3 is less than or equal to the opening radius 132r. Next, a first group of adjacent selected openings (such as but not limited to selected openings A1" and selected openings A2") and a second group of adjacent selected openings (such as but not limited to selected openings A4" and selected openings A5") can be selected from the opening sequence A", and the difference between the projections of the two groups of selected openings on any coordinate axis is calculated respectively to obtain the absolute value of the subtraction of the two differences, i.e., the ΔP difference or the projection difference variation condition. Moreover, according to the present invention, the ΔP difference between any two groups of adjacent openings 132 in the opening sequence A" will be greater than 20μm.

The number of openings and the sequence direction used in selecting the opening sequence of the present invention are not limited to those disclosed in Figures 4 to 6. Furthermore, when selecting the opening sequence, a straight reference line can be set along any direction on the decorative layer 130 as the sequence direction, and the selected openings can be selected along the reference line. Therefore, the reference line is not limited to being parallel to the coordinate axis (horizontal axis X or vertical axis Y) in the coordinate system. For example, the reference line can have an angle greater than 0 degrees and less than 90 degrees with the coordinate axis, but it is not limited to the above. Furthermore, according to the present invention, in any selected opening sequence, the projection difference variation condition of any two sets of adjacent selected openings is greater than 20 microns, that is, |ΔP _i,x -ΔP _j,x |>20μm and/or |ΔP _i, y -ΔP _j,y |>20μm.

Please refer to FIG. 1 again. The display panel 110 in the hidden display 100 of the present invention includes a plurality of sub-pixels PX located in a display area 110R, wherein the sub-pixel PX is the smallest unit that the display panel 110 can use to independently output light. The size (or spacing) of the sub-pixel PX can be less than or equal to 20 microns. Corresponding to the size of the sub-pixel PX, the present invention provides a design in which the projection difference variation condition (ΔP difference) of the opening 132 is greater than 20 microns, so that the openings 132 in the decorative layer 130 are not completely equidistant from each other, and have the above-mentioned special arrangement design, thereby improving the moiré problem in the displayed image, and even effectively eliminating the moiré. On the other hand, in another embodiment of the present invention, when the resolution of the display panel 110 is smaller and the pitch of the sub-pixel PX is larger and greater than 20 microns, for example, greater than 30 microns, the projection difference variation condition of the opening 132 of the decorative layer 130 is preferably greater than 30 microns. This design can effectively eliminate moiré. According to the present invention, the ΔP difference is preferably greater than the size of the sub-pixel PX of the display panel 110, that is, the ΔP difference is preferably greater than the minimum pixel size, but is not limited to the above.

Please refer to FIG. 7, which is a schematic diagram of the display screen of the embodiment and comparative example of the hidden display of the present invention. As shown in comparative example (i) of FIG. 7, when the hidden display is in a lighted state, if the adjacent openings of the decorative layer have equal spacing or have a certain periodic distribution, such as the ΔP difference is 0, the openings and the sub-pixels regularly arranged in the display will overlap and interfere, and the displayed screen will have moire MO, affecting the display screen quality, for example, the image will be unclear. In contrast, please refer to Example (ii) of the present invention. According to the above-mentioned opening setting conditions of the present invention, that is, when the projection difference variation condition is greater than a specific value (for example, ΔP difference>20μm or ΔP difference>30μm), the image displayed by the hidden display is lit without moiré or has no obvious moiré.

Please refer to FIG. 4 again. According to the present invention, the openings 132 in the decorative layer 130 may have substantially the same size and shape. Although the openings 132 shown in FIG. 4 are circular, in a variant embodiment, the openings 132 may have other suitable shapes. Furthermore, in the decorative layer 130, the opening ratio (i.e., the ratio of the opening area) of the total area of the openings 132 to the display region 110R of the display panel 110 is in the range of 20% to 50%, preferably 20% to 30%. If the opening ratio is less than 20%, when the display panel 110 is turned on, the total area of the openings 132 is too small, which affects the overall display quality of the hidden display 100. The decorative pattern DC of the decorative layer 130 may block the display screen, or the user may be easily disturbed by the decorative pattern DC when observing the image. If the opening ratio is greater than 50%, it will affect the texture of the decorative pattern DC of the decorative layer 130 when the display panel 110 is turned off or in standby mode, for example, the holes are easily visible. The opening ratio can be defined by the number and area of the openings 132 per unit area. By controlling the opening ratio within the above range, the transmittance of the light EL generated by the display panel 110 can be evenly controlled to improve the display quality. For example, within a unit area of 500 microns x 500 microns, the aperture radius 132r of the aperture 132 ranges from 20 to 40 microns, and the number of apertures ranges from 10 to 100. Under this design, the aperture ratio can be maintained at 20% to 50%.

Table 1 is an example table of the opening radius, number of openings and opening ratio of the openings in the decorative layer of the hidden display of the present invention. For example, when the opening radius in the unit area (area) is 30 microns and the number of openings is 27, the opening ratio per unit area is about 31%. When the opening ratio is controlled at 20-50% by the above parameters, a better display effect can be achieved. However, it should be noted that the opening radius and the number of openings are not limited to those listed in the above table.

Please refer to FIG. 1 again. The decorative layer 130 and the opening 132 can be made by any suitable process. For example, the decorative layer 130 can be made by printing, a yellow light process, a coating process or an inkjet process, but not limited to the above. In detail, in some embodiments, the printing process can use a screen with a predetermined pattern to print the decorative pattern DC on the upper surface 120a of the transparent substrate 120 by screen printing with different colors of ink. Under this process, the printed decorative layer 130 will directly have the opening 132, that is, the predetermined opening position will not be printed with ink. In some embodiments, if the decorative layer 130 is made by a photolithography process, a whole layer of decorative pattern DC can be directly formed on the surface of the transparent substrate 120, and then the decorative layer 130 is partially removed by exposure, development and etching processes to form openings 132 in the decorative layer 130. The advantage of the photolithography process is that it can precisely control the number, size and dimensions of the openings 132. In other embodiments, when the whole layer of decorative layer 130 is made by a coating process, the openings 132 can be burned out in the decorative layer 130 by laser drilling. Laser drilling can accurately remove the ink material at the predetermined opening to form the openings 132 by controlling the energy of the laser beam. In some other embodiments, the decorative layer 130 can also be formed by inkjet printing, whereby the decorative pattern DC is sprayed on the surface of the transparent substrate 120, while the location where the opening 132 is predetermined is not sprayed with ink.

Furthermore, in the hidden display 100 shown in FIG. 1 , the display panel 110 may be a non-self-luminous display panel, for example, the display panel 110 includes a first substrate 112, a second substrate 114, a display medium layer 116, and a circuit layer 118. The second substrate 114 and the first substrate 112 are disposed opposite to each other, the display medium layer 116 is disposed between the first substrate 112 and the second substrate 114, and the circuit layer 118 is disposed on the surface of one of the first substrate 112 and the second substrate 114. FIG. 1 takes the example that the circuit layer 118 is disposed on the inner surface of the first substrate 112 at the lower side, but is not limited thereto. The display medium layer 116 is, for example but not limited to, a liquid crystal layer, which can control the light output of each sub-pixel PX to display a picture. In addition, the display panel 110 may further include a light source 140 disposed on one side of the display panel 110. For example, the light source 140 may be a backlight module disposed on the side of the display panel 110 opposite to the transparent substrate 120, but the present invention is not limited thereto.

Please refer to FIG. 8, which is a partial cross-sectional schematic diagram of a variant embodiment of the hidden display of the present invention. In this variant embodiment, the display panel 110 can be a self-luminous display panel, which includes a first substrate 112, a second substrate 114, a light-emitting layer 115 and a circuit layer 118, wherein the light-emitting layer 115 is disposed between the first substrate 112 and the second substrate 114 and can be electrically connected to the circuit layer 118. The display panel 110 is, for example, an organic light-emitting display panel (OLED), and the light-emitting layer 115 may include an organic light-emitting element. The display panel 110 may also be an inorganic light-emitting display panel, and the light-emitting layer 115 may include, for example, a micro light-emitting diode (μLED), but is not limited thereto. It should be noted that the type of display panel 110 of the present invention is not limited to the above-mentioned embodiment, and the present invention can use any suitable type of display panel in the hidden display 100. Furthermore, the decorative layer 130 on the surface of the transparent substrate 120 has a plurality of openings 132, and the arrangement of the openings 132 can meet the aforementioned projection difference variation conditions, such as ΔP difference>20μm, ΔP difference>30μm, or ΔP difference is greater than the maximum size of the sub-pixel of the display panel 110. In other variant embodiments, the openings 132 can be irregularly or randomly arranged, that is, the intervals between adjacent openings 132 are not completely equal. It should be noted that the structure of the hidden display 100 shown in FIG. 1 and FIG. 8 can be applied to various embodiments of the present invention and will not be described in detail.

Please refer to FIG. 9 and FIG. 10. FIG. 9 is a partial schematic diagram of the second embodiment of the hidden display of the present invention, and FIG. 10 is a partial schematic diagram of the second embodiment of the hidden display of the present invention. In this embodiment, the hidden display 100 is a curved display with an appropriate curvature, wherein the display panel 110 and the transparent substrate 120 disposed on the display panel 110 included in the hidden display 100 may have a conformal curved surface structure, that is, the display panel 110 and the transparent substrate 120 are both curved surface structures. The curved surface is a two-dimensional curved surface in three-dimensional space, in particular, a single curvature curved surface, wherein the radius of curvature R is, for example, greater than 100 mm, but not limited thereto. The display surface of the hidden curved display of the present invention can be concave or convex. In the embodiment shown in FIG. 9, the display surface of the hidden display 100 is concave, that is, the concave surface faces the display side DS. In the variant embodiment shown in FIG. 10, the display surface of the hidden display 100 is convex, that is, the convex surface faces the display side DS. The distribution conditions of the openings 132 of the decorative layer 130 mentioned in the aforementioned other embodiments can be applied to the embodiments of FIG. 9 and FIG. 10 or other embodiments, and will not be repeated.

The hidden display of the present invention can be applied in a car or any device that wants to hide the display. The decorative layer on the surface of the hidden display has a predetermined decorative pattern. When the display panel does not display an image, the decorative pattern can hide the display panel and present an integrated appearance with the location where it is set. For example, the hidden display can be set on the center console of the vehicle or the glove box in front of the co-driver's seat. The interior of the vehicle can have a predetermined decorative pattern, and the decorative layer of the hidden display panel of the present invention can match the interior and have a similar or identical decorative pattern. The decorative layer has multiple openings, and its configuration meets the aforementioned projection difference variation conditions and opening ratio. Under this design, when the display panel is lit, the displayed image can be clearly seen through the decorative layer, and the decorative pattern will fade or even disappear, so it will not affect the visual reading of information, and it is not easy to have moiré in the picture, so it has good display quality and can fully display information.

The above is only the preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

100: Hidden display

120: Transparent substrate

130:Decorative layer

132: Opening

132r: Opening radius

A1,A2,A3,A4,A5,A6: selected openings

d1,d2,d3,d4: difference

D1,D2,D3: Direction

Dr: Sequence direction

O: Origin

P ₁ ,P ₂ ,P ₃ ,P ₄ ,P ₅ ,P ₆ ,: vector

P _1,x ,P _{2 ,x} ,P _{3,x ,P 4,x} ,P _1,y ,P _2,y ,P _3,y ,P _4,y : Projection volume

RL1: Reference line

X: horizontal axis

Y: vertical axis

Claims (13)

A hidden display comprises: a display panel; a transparent substrate disposed on the display panel; a decorative layer disposed on the surface of the transparent substrate, wherein the decorative layer comprises a plurality of openings, wherein the distribution positions of the openings meet the following conditions: the openings comprise a set of opening sequences distributed along a direction, the projections of the opening centers of two adjacent openings in the set of opening sequences on a coordinate axis have a first projection difference, the projections of the opening centers of the other two adjacent openings in the set of opening sequences on the coordinate axis have a second projection difference, and the difference between the first projection difference and the second projection difference is greater than 20 micrometers (μm). According to the hidden display described in claim 1, the openings in the opening sequence meet the following conditions: the openings in the opening sequence include two adjacent reference openings, the extension line of the line connecting the opening centers of the reference openings is defined as a reference line, and the reference line extends along the direction; and the shortest distance between the opening centers of the other openings in the opening sequence and the extension line is less than or equal to the opening radius of the openings. According to the hidden display described in claim 1, the coordinate axis belongs to a two-dimensional coordinate system, and the two-dimensional coordinate system further includes another coordinate axis, the projection of the opening centers of the two adjacent openings in the opening sequence on the other coordinate axis has a third projection difference, and the projection of the opening centers of the other two adjacent openings in the opening sequence on the other coordinate axis has a fourth projection difference, wherein the difference between the third projection difference and the fourth projection difference is greater than 20 microns. A hidden display according to claim 1, wherein the minimum pixel size of the display panel is less than or equal to 20 microns. The hidden display according to claim 1, wherein the minimum pixel size of the display panel is greater than 20 microns, and the difference between the first projection difference and the second projection difference is greater than the minimum pixel size. According to the hidden display described in claim 1, the display panel has a display area, and the total area of the openings has an opening ratio range of 20% to 50% for the display area. According to the hidden display described in claim 1, the display panel has a display area, and the total area of the openings has an opening ratio range of 20% to 30% for the display area. According to the hidden display described in claim 1, the display panel includes: a first substrate; a second substrate disposed opposite to the first substrate; a display medium layer disposed between the first substrate and the second substrate; and a circuit layer disposed on the surface of one of the first substrate and the second substrate. The hidden display according to claim 8 also includes a light source disposed on one side of the display panel. According to the hidden display described in claim 1, the display panel includes: a first substrate; a second substrate disposed opposite to the first substrate; a light-emitting layer disposed between the first substrate and the second substrate; and a circuit layer disposed on the surface of one of the first substrate and the second substrate. According to the hidden display described in claim 1, the display panel and the transparent substrate disposed on the display panel have a conformal curved surface structure. According to the hidden display described in claim 1, the transparent substrate is located between the decorative layer and the display panel. According to the hidden display described in claim 1, the decorative layer is located between the transparent substrate and the display panel.