Electronic ink touch display module

Abstract

The invention provides an electronic ink touch display module, comprising a cover plate comprising an upper surface and a lower surface; the shielding layer is arranged on the edge of the upper surface or the lower surface of the cover plate; the touch electrode layer is arranged below the cover plate; the display layer is arranged below the touch electrode layer and comprises a screen area and an element connecting area; and the screen extension layer is arranged between the touch electrode layer and the display layer and is arranged to cover the element connection area, and the screen extension layer is arranged to be far away from the shielding layer and adjacent to the display layer.

Description

Technical Field

[0001] This invention relates to an electronic ink touch display module, and more particularly to an electronic ink touch display module that utilizes the principle of visual perception to set a screen extension layer in a stacked structure to form an electronic ink touch display module with a narrow bezel visual effect. Background Technology

[0002] With the trend towards narrow bezels, current e-ink screen products are gradually moving towards designs with narrower bezels to increase screen-to-body ratio. However, in order to reserve space for components such as the driver ICs in the e-ink screen, current narrow-bezel designs typically have three narrower bezels but require one wider bezel to accommodate these components, resulting in an overall less aesthetically pleasing product appearance. Therefore, there is a demand for e-ink screen designs with narrow bezels on all four sides.

[0003] In the prior art, Chinese patent number CN 220509252 discloses an electronic ink screen, including: a screen display layer; a near-screen color layer; and a border. However, the prior art does not specifically define the relative positions of the near-screen color layer, the border, the screen display layer, etc., and there are specific disclosures based on the principles of visual perception in product design, such as further defining the relative positions or relative colors of the near-screen color layer and the screen display layer to create visual contrast effects. Therefore, the optimal visual effect cannot be achieved.

[0004] Therefore, there is a need to provide an electronic ink touch display module that can achieve visual integration between the screen and the screen extension area by placing a screen extension layer at a specific location and with a specific material, thereby utilizing visual contrast effect to achieve visual integration and have a shielding effect on components such as driving integrated circuits, forming a touch display module with a narrow bezel visual effect, in order to overcome the above-mentioned problems. Summary of the Invention

[0005] To effectively solve the above problems, the present invention proposes an electronic ink touch display module, comprising: a cover plate including an upper surface and a lower surface; a shielding layer disposed on the edge of the upper surface or the lower surface of the cover plate; a touch electrode layer disposed below the cover plate; a display layer disposed below the touch electrode layer and including a screen area and a component connection area; and a screen extension layer disposed between the touch electrode layer and the display layer and configured to cover the component connection area, wherein the screen extension layer is configured to be away from the shielding layer and adjacent to the display layer.

[0006] Preferably, a portion of the screen extension layer is not located within the vertical projection range of the shielding layer.

[0007] Preferably, the component connection area is at least partially located within the vertical projection range of the screen extension layer and not within the vertical projection range of the shielding layer.

[0008] Preferably, the ratio of the distance between the upper surface of the cover plate and the upper surface of the shielding layer and the distance between the upper surface of the cover plate and the upper surface of the screen extension layer is 1:1.04 to 2.67.

[0009] Preferably, the electronic ink touch display module further includes: a light guide layer located between the cover plate and the touch electrode layer, wherein the ratio of the distance between the upper surface of the cover plate and an upper surface of the shielding layer and the distance between the upper surface of the cover plate and an upper surface of the screen extension layer is 1:1.1 to 6.

[0010] Preferably, the screen extension layer is printed on a lower surface of the touch electrode layer or on a surface substantially flush with an upper surface of the display layer.

[0011] Preferably, the optical density value of the screen extension layer is 1 to 2.

[0012] Preferably, the perceived lightness difference (ΔL*) between the screen extension layer and the screen area is 0 to 1.

[0013] Preferably, the perceived brightness difference between the masking layer and the screen area is 30–45.

[0014] Preferably, the color difference (ΔE(Lab)) between the screen extension layer and the screen area is 0 to 2.

[0015] To enable those skilled in the art to understand the purpose, features and effects of the present invention, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an electronic ink touch display module according to a first embodiment of the present invention;

[0017] Figure 2 A structural diagram of an electronic ink touch display module according to a second embodiment of the present invention; and

[0018] Figure 3 The illustration shows a visual comparison of the electronic ink touch display module according to the second embodiment of the present invention with other examples.

[0019] Explanation of reference numerals in the attached figures

[0020] 1,2: Electronic ink touch display module

[0021] 10: Cover plate

[0022] 20: Shielding layer

[0023] 30: First optically transparent adhesive layer

[0024] 40: Touch electrode layer

[0025] 50: Second optically transparent adhesive layer

[0026] 60: Screen Extension Layer

[0027] 70: Display Layer

[0028] 71: Screen area

[0029] 72: Component Connection Area

[0030] 80: Light guide layer

[0031] 90: Third optically transparent adhesive layer Detailed Implementation

[0032] The inventive concept will now be more fully described below with reference to the accompanying drawings, in which exemplary embodiments illustrating the inventive concept are shown. The advantages and features of the inventive concept, as well as methods of achieving it, will become apparent from the exemplary embodiments described in more detail below with reference to the accompanying drawings. However, it should be noted that the inventive concept is not limited to the exemplary embodiments described below, but can be implemented in various forms. Therefore, exemplary embodiments are provided only to disclose the inventive concept and to enable those skilled in the art to understand the category of the inventive concept. In the accompanying drawings, exemplary embodiments of the inventive concept are not limited to the specific instances provided herein and are exaggerated for clarity.

[0033] The terminology used herein is for illustrative purposes only and is not intended to limit the invention. Unless the context clearly indicates otherwise, the singular forms of the terms “a” and “the” as used herein are intended to include the plural forms as well. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. It should be understood that when an element is referred to as “connected” or “coupled” to another element, the element may be directly connected or coupled to the other element or there may be intermediate elements.

[0034] Similarly, it should be understood that when an element (e.g., a layer, region, or substrate) is said to be "on" another element, the element may be directly on the other element, or there may be intermediate elements present. In contrast, the term "directly" implies the absence of intermediate elements. It should also be understood that when the terms "comprising" or "including" are used herein, they indicate the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0035] Furthermore, exemplary embodiments in the detailed description will be illustrated by cross-sectional views that serve as idealized exemplary diagrams of the inventive concept. Accordingly, the shape of the exemplary diagrams may be modified according to manufacturing techniques and / or tolerable errors. Therefore, exemplary embodiments of the inventive concept are not limited to the specific shapes shown in the exemplary diagrams, but may include other shapes that may be produced according to the manufacturing process. The areas illustrated in the drawings have general characteristics and are used to illustrate specific shapes of elements. Therefore, this should not be considered as limiting the scope of the inventive concept.

[0036] It should also be understood that although terms such as "first," "second," and "third" may be used herein to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish individual elements. Therefore, a first element in some embodiments may be referred to as a second element in other embodiments without departing from the teachings of the invention. Exemplary embodiments of the inventive concepts illustrated and described herein include their complementary counterparts. Throughout this specification, the same element numbers or the same indicators denote the same elements.

[0037] Furthermore, exemplary embodiments are illustrated herein with reference to sectional views and / or plan views, which are idealized exemplary illustrative diagrams. Therefore, deviations from the illustrated shapes are expected due to factors such as manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the areas shown herein, but are intended to include shape deviations due to factors such as manufacturing processes. Therefore, the areas shown in the figures are schematic, and their shapes are not intended to illustrate the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0038] Please refer to Figure 1 , Figure 1 This is a structural diagram of an electronic ink touch display module 1 according to a first embodiment of the present invention. The electronic ink touch display module 1 includes: a cover plate 10; a shielding layer 20; a first optically transparent adhesive layer 30; a touch electrode layer 40; a second optically transparent adhesive layer 50; a screen extension layer 60; and a display layer 70, including a screen area 71 and a component connection area 72. The various components of the electronic ink touch display module 1 and their functions will be described in detail below.

[0039] like Figure 1As shown, the cover plate 10 can be used to protect the front surface of the e-ink touch display module 1. The cover plate 10 can be used to form the outer surface of the e-ink touch display module 1 to protect the e-ink touch display module 1 from scratches, abrasions and other damage. In some embodiments, the cover plate 10 can be a multilayer structure or composite material, and can include one or more layers or coatings of self-healing material. For example, the cover plate 10 can include a self-healing anti-glare and / or anti-reflective coating disposed on a rigid substrate such as a plastic substrate. The self-healing anti-glare and / or anti-reflective coating can form the outer layer of the cover plate 10. The self-healing material can include various polymers or plastics with self-healing properties, such as polyvinylidene fluoride cohexafluoropropylene, ionic salts, etc.

[0040] like Figure 1 As shown, the shielding layer 20 can be disposed on the lower surface of the cover plate 10. The shielding layer 20 can be set to a dark color along the edge of the electronic ink touch display module 1. For example, the shielding layer 20 can be disposed on the four edges of the lower surface of the cover plate 10. The shielding layer 20 can be used to reduce light leakage that causes halo effects and / or light emission from the display area. However, the invention is not limited thereto; it is understood that the shielding layer 20 can also be disposed on the upper surface of the cover plate 10.

[0041] like Figure 1 As shown, a first optically transparent adhesive layer 30 is disposed between the cover plate 10 and the touch electrode layer 40 for bonding the two. The first optically transparent adhesive layer 30 may include a light-transmitting adhesive, etc. Specifically, the first optically transparent adhesive layer 30 may have a refractive index of about 1.5.

[0042] like Figure 1 As shown, the touch electrode layer 40 is disposed below the first optically transparent adhesive layer 30. The touch electrode layer 40 may include layers of olefins or other materials and can be used to detect capacitive or resistive touch with the electronic ink touch display module 1. For example, the touch electrode layer 40 may be a sensor film metal mesh bilayer film (film 2). Specifically, the bilayer film consists of sensor electrodes formed on both sides of a single film.

[0043] like Figure 1 As shown, a second optically transparent adhesive layer 50 is disposed between the touch electrode layer 40 and the display layer 70 for bonding the two. The second optically transparent adhesive layer 50 may include any light-transmitting adhesive. Specifically, the second optically transparent adhesive layer 50 may have a refractive index of about 1.5.

[0044] Specifically, the screen extension layer 60 is disposed at a specific location, that is, it is disposed between the touch electrode layer 40 and the display layer 70 in a single-layer printing manner. In the first embodiment of the present invention, as... Figure 1As shown, the screen extension layer 60 can be conveniently disposed on the lower surface of the touch electrode layer 40 by applying an ink that is visually similar to the screen area 71 to the lower surface of the touch electrode layer 40. However, the present invention is not limited to this. In other embodiments, the screen extension layer 60 can also be disposed on a surface substantially flush with the upper surface of the display layer 70 by disposing a thin sheet with a color, gloss, and texture similar to the screen area 71 of the display layer 70. Alternatively, since the height of the components placed in the component connection area 72 is less than the thickness of the screen area 71, the uppermost part of the component connection area 72 is hollow. Therefore, the space where the driving components are placed is filled with colloid until it is flush with the upper surface of the display layer 70, and ink is applied to the colloid so that the screen extension layer 60 is adjacent to the display layer 70 and away from the shielding layer 20. That is, the distance between the screen extension layer 50 and the display layer 70 is minimized, and the distance between the screen extension layer 50 and the shielding layer 20 is maximized. That is, the distance between the screen extension layer 50 and the lower surface of the cover plate 10 is greater than the distance between the shielding layer 20 and the lower surface of the cover plate 10.

[0045] Furthermore, a portion of the screen extension layer 50 is not located within the vertical projection range of the shielding layer 20. This portion of the screen extension layer 50 can form a touch area without display functionality, thereby enabling the e-ink touch display module 1 to have a better narrow bezel visual effect.

[0046] Furthermore, the screen extension layer 60 is formed with an ink containing a material with a high molar absorptivity, such as a resin material containing pigments, which can be: white pigments (e.g., titanium dioxide, zinc oxide, barium sulfate), black pigments (e.g., carbon black), and the ink also contains resin components and other components (e.g., viscosity modifiers (e.g., silicon dioxide) and organic solvents (e.g., ketones, ethers, esters)). The screen extension layer 60 is manufactured to have an optical density (OD) value greater than 1. It should be noted that, since the screen extension layer 60 and the shielding layer 20 are located within the vertical projection range of the screen extension layer 60 and the shielding layer 20, that is, above the component connection area 72 rather than above the screen area 71, the light path when ambient light or the light source of the front light system enters the component connection area 72 is different from the light path when it enters the screen area 71; therefore, the optical density values ​​required for the screen extension layer 60 and the shielding layer 20 to achieve the shielding effect are different. In detail, screen area 71 reflects light entering it from ambient light or the front light system to achieve the display effect; however, component connection area 72 is not designed to reflect light, and therefore the optical density value of screen extension layer 60 used to shield component connection area 72 can be well shielded from the underlying component connection area 72 even when it is much lower than the optical density value of shielding layer 20. Specifically, screen extension layer 60 has an optical density value between 1 and 2, while shielding layer 20 has an optical density value between 3 and 5.

[0047] Furthermore, the perceived brightness (L*) value of the ink (i.e., L* in the CIELAB color space) is approximately equal to that of screen area 71, and the color of the ink can be similar to the color of screen area 71 (for example, the color difference (ΔE(Lab)) between the ink and screen area 71 is 0 to 2; or, for example, the color of the ink is modulated to be as close as possible to the color of screen area 71 using the Pantone Matching System). In addition, the thickness of the screen extension layer 60 can be changed by applying multiple layers of ink.

[0048] The optical values ​​measured by the electronic ink touch display module according to an embodiment of the present invention will be presented in the following table. The measurement standard established by the International Commission on Illumination uses ΔE as the standard for measuring screen color difference; therefore, in this invention, the integral color is determined based on the color difference (ΔE(Lab)).

[0049] Table 1 below shows the measured optical values ​​for screen area 71.

[0050] Table 1

[0051] L* a* b* screen area 72.47 -1.95 -0.87

[0052] Table 2 shows the optical values ​​and optical density (OD) values ​​of the screen extension layer 60, as well as the color difference (ΔE(Lab)) between the screen extension layer 60 and the screen area 71 shown in Table 1. Furthermore, single-layer and double-layer inks were used to form screen extension layers 60 of different thicknesses, and the values ​​were taken twice for each thickness.

[0053] As can be seen from Table 2, by setting the screen extension layer 60, the electronic ink touch display module according to the embodiment of the present invention can have an optical density value between 1 and 2 and a color difference (ΔE(Lab)) between 0 and 2. Furthermore, when two layers of ink are applied to form a thicker screen extension layer 60, the measured color difference (ΔE(Lab)) is 1.34, which is less than the 1.39 and 1.40 measured with a single layer of ink. However, although the two-layer ink has a smaller color difference value, its OD value is also increased, that is, it has stronger opacity. However, since the screen extension layer 60 not only needs to be similar in color to the display layer 70, but also needs to have an appropriate degree of opacity to simulate the optical effect of the electronic ink display, and a thinner thickness to maintain a design that is as close as possible to the display layer 70, considering factors such as color similarity, opacity, and thickness, a screen extension layer formed with a single layer of ink is preferable.

[0054] Table 2

[0055]

[0056] like Figure 1 As shown, the display layer 70 is disposed below the second optically transparent adhesive layer 50. The display layer 70 includes: a screen area 71 for displaying information in pixels; and a component connection area 72 including various driving elements for driving the screen area 71. For example, the component connection area 72 may include components such as connecting pads, flexible circuit boards, and driving integrated circuits.

[0057] Understandably, the present invention mainly uses a screen extension layer 60 set in a specific position and with a specific material to achieve visual integration between the screen area and the screen extension area by utilizing the visual contrast effect and to have a shielding effect on components such as the driving integrated circuit, so that the electronic ink touch display module 1 has a better narrow bezel visual effect.

[0058] Specifically, regarding the visual contrast effect, the screen extension layer 60 of the present invention is disposed between the touch electrode layer 40 and the display layer 70. For example, the screen extension layer 60 may be disposed on the lower surface of the touch electrode layer 40 or on a surface flush with the upper surface of the display layer 70, so as to minimize the distance between the screen extension layer 60 and the display layer 70 and maximize the distance between the screen extension layer 60 and the shielding layer 20.

[0059] Understandably, when a user uses the e-ink touch display module 1 (i.e., viewed from above), the masking layer 20, being close to the user's eyes and dark in color, attracts the user's attention within the visual environment, creating a visual anchoring effect. Simultaneously, the screen extension layer 60 and the adjacent screen area 71 are both light-colored (i.e., their colors are similar), thus creating a visual contrast. This makes the boundary between the masking layer 20 and the screen extension layer 60 more noticeable, and the boundary between the screen extension layer 60 and the screen area 71 more easily overlooked. Therefore, visually, the screen extension layer 60 becomes part of the screen area 71, effectively increasing the usable display module area and reducing the wider border caused by the component connection area 72. This results in a better narrow bezel visual effect.

[0060] In addition, to achieve a visual contrast effect, there needs to be a significant perceived brightness difference between the masking layer 20 and the screen area 71. Therefore, the ΔL* value between the masking layer 20 and the screen area 71 can be greater than 30, and generally, the ΔL* value between the masking layer 20 and the screen area 71 is between 30 and 45. Conversely, there needs to be a smaller perceived brightness difference between the screen extension layer 60 and the screen area 71. Therefore, the ΔL* value between the screen extension layer 60 and the screen area 71 can be less than 1, and its ΔL* value should be as close to 0 as possible to create a better narrow bezel visual effect.

[0061] Furthermore, regarding the masking effect between components, since the screen extension layer 60 needs to completely cover the components in the component connection area 72 below, especially when the components to be masked each have different colors, the screen extension layer 60 must be able to properly mask the components of each color below, so that when the user looks from above the touch display module, they will not perceive the various colors shining through from under the screen extension layer. In other words, when the objects to be masked have similar colors, the light density value required to achieve a satisfactory masking effect is lower than when the objects to be masked have dissimilar colors. This is because different colors of objects represent the absorption / reflection effects of different wavelengths of light. When the components to be masked have significantly different colors, a higher light density value is required to prevent color blocks with significantly different optical properties from appearing through the masking layer, so that the area observed through the masking layer appears as a uniform masking layer color. Since the components in the component connection area 72 of the current e-ink screen, such as the driver integrated circuit and flexible circuit board, are usually different colors from each other, such as gray-white (e.g., the bonding area), black (e.g., the driver integrated circuit), gold (flexible circuit board), etc., it is challenging to cover these components with such large differences in brightness and chroma. To achieve proper covering, the optical density value of the screen extension layer 60 can be greater than 1, so that the screen extension layer 60 completely covers the components in the component connection area 72 below and achieves a better narrow bezel visual effect. In addition, since the reflective property of the screen area 71, which is the e-ink screen in the e-ink touch display module 1, is that about 50% of the light entering it is reflected back to the user's eyes, and the rest of the light enters the e-ink capsule, when the optical density value of the screen extension layer 60 is made less than 2, some light transmittance can still be retained, which is closer to simulating the optical characteristics of the screen area 71 and exhibiting a visual effect as if light enters the e-ink capsule.

[0062] Furthermore, regarding the occlusion effect between components, the screen extension layer 60 can partially cover the screen area 71, making the area of ​​the screen extension layer 60 larger than the area of ​​the component connection area 72. In this case, the component connection area 72 can be occluded by the screen extension layer 60 from all user viewing angles, so that the user will not see the colors produced by the individual components in the component connection area 72 that should be occluded. Therefore, a better narrow bezel visual effect can be achieved.

[0063] Furthermore, regarding the specific thickness of each component of the electronic ink touch display module 1, the cover plate may have a thickness of 0.3 to 2.5 mm, the first optically transparent adhesive layer 30 may have a thickness of approximately 75 to 250 μm, the touch electrode layer 40 may have a thickness of approximately 20 to 250 μm, the second optically transparent adhesive layer 50 may have a thickness of approximately 75 to 200 μm, and the screen extension layer 60 may have a thickness of approximately 6 to 15 μm. However, the present invention is not limited thereto.

[0064] Therefore, in the electronic ink touch display module 1 according to the first embodiment of the present invention, the ratio of the distance between the upper surface of the cover plate 10 and the upper surface of the shielding layer 20 and the distance between the upper surface of the cover plate 10 and the upper surface of the screen extension layer 60 is 1:1.04 to 2.67. This ratio range is obtained by taking the minimum value of the first optically transparent adhesive layer 30 (75 μm) and the touch electrode layer 40 (20 μm) and the maximum value of the cover plate 10 (2500 μm) to obtain a ratio of 1:1.04, that is, (2500:(2500+75+20))=2500:2595=1:1.04. Furthermore, taking the maximum values ​​of 250μm for the first optically transparent adhesive layer 30 and 250μm for the touch electrode layer 40, and the minimum value of 300μm for the cover plate 10, a ratio of 1:2.67 is obtained, i.e., (300:(300+250+250))=300:800=1:2.67. Therefore, calculated from the surface visible to the eye (i.e., the upper surface of the cover plate 10), the shielding layer 20 is adjacent to the upper surface of the cover plate 10, while the screen extension layer 60 is relatively farther away from the upper surface of the cover plate 10. Thus, the aforementioned visual contrast effect can be achieved.

[0065] Please refer to Figure 2 , Figure 2 This is a structural diagram of an electronic ink touch display module 2 according to a second embodiment of the present invention. The electronic ink touch display module 2 includes: a cover plate 10; a shielding layer 20; a first optically transparent adhesive layer 30; a touch electrode layer 40; a second optically transparent adhesive layer 50; a screen extension layer 60; a display layer 70, including a screen area 71 and a component connection area 72; a light guide layer 80; and a third optically transparent adhesive layer 90. That is, compared to the electronic ink touch display module 1, the electronic ink touch display module 2 of the second embodiment of the present invention further includes a light guide layer 80 and a third optically transparent adhesive layer 90.

[0066] The following will describe in detail the various components of the e-ink touch display module 2 and the functions of each component. Parts identical to those in the e-ink touch display module 1 will not be repeated.

[0067] like Figure 2As shown, a first optically transparent adhesive layer 30 is disposed between the cover plate 10 and the light guide layer 80 for bonding the two. The first optically transparent adhesive layer 30 may include a light-transmitting adhesive, etc. Specifically, the first optically transparent adhesive layer 30 may have a refractive index of about 1.2 to 1.7, for example, a refractive index of 1.5.

[0068] like Figure 2 As shown, a light guide layer 80 is disposed below the first optically transparent adhesive layer 30. The light guide layer 80 can be configured to guide light from one or more light-emitting diodes (LEDs) or other light sources. The light guide layer 80 can be formed of plastic or other materials. For example, the light guide layer 80 can be used to illuminate in dark environments and can provide light that does not directly shine into the user's eyes, thereby reducing eye strain.

[0069] like Figure 2 As shown, a third optically transparent adhesive layer 90 is disposed between the light guide layer 80 and the touch electrode layer 40 to bond the two together. The third optically transparent adhesive layer 90 may include a light-transmitting adhesive, etc. Specifically, the third optically transparent adhesive layer 90 may have a refractive index of about 1.2 to 1.7, for example, a refractive index of 1.5.

[0070] like Figure 2 As shown, the touch electrode layer 40 is disposed below the third optically transparent adhesive layer 90.

[0071] Understandably, the present invention mainly achieves visual contrast and masking effects by setting the screen extension layer 60 in a specific position and with a specific material, so that the electronic ink touch display module 1 has a better narrow bezel visual effect.

[0072] Therefore, compared to the electronic ink touch display module 1, since the electronic ink touch display module 2 of the second embodiment of the present invention further includes a light guide layer 80 and a third optically transparent adhesive layer 90, the visual contrast effect is improved because the increased thickness of the light guide layer 80 and the third optically transparent adhesive layer 90 increases the distance between the screen extension layer 60 and the display layer 70 and the shielding layer 20. As a result, the visual contrast effect is more obvious, and a better narrow bezel visual effect can be formed.

[0073] Furthermore, regarding the specific thickness of each component in the electronic ink touch display module 2, the first optically transparent adhesive layer 30 may have a thickness of approximately 75–250 μm, the touch electrode layer 40 may have a thickness of approximately 20–250 μm, the second optically transparent adhesive layer 50 may have a thickness of approximately 75–200 μm, the screen extension layer 60 may have a thickness of approximately 6–15 μm, the light guide layer 80 may have a thickness of approximately 100–900 μm, and the third optically transparent adhesive layer 90 may have a thickness of approximately 50–100 μm. However, the present invention is not limited thereto.

[0074] Therefore, in the electronic ink touch display module 2 according to the first embodiment of the present invention, the ratio of the distance between the upper surface of the cover plate 10 and the upper surface of the shielding layer 20 and the distance between the upper surface of the cover plate 10 and the upper surface of the screen extension layer 60 is 1:1.1 to 6. This ratio range is obtained by taking the minimum values ​​of the first optically transparent adhesive layer 30 (75 μm), the light guide layer 80 (100 μm), the third optically transparent adhesive layer 90 (50 μm), and the touch electrode layer 40 (20 μm), and taking the maximum value of the cover plate 10 (2500 μm) to obtain a ratio of 1:1.1, that is, (2500:(2500+75+100+50+20))=2500:2745=1:1.1. Furthermore, taking the maximum values ​​of the first optically transparent adhesive layer 30 (250 μm), the light guide layer 80 (900 μm), the third optically transparent adhesive layer 90 (100 μm), and the touch electrode layer 40 (250 μm), and taking the minimum value of the cover plate 10 (300 μm), a ratio of 1:6 is obtained, i.e., (300 : (300 + 250 + 900 + 100 + 250)) = 300 : 1800 = 1:6. Therefore, calculated from the surface visible to the eye (i.e., the upper surface of the cover plate 10), the shielding layer 20 is adjacent to the upper surface of the cover plate 10, while the screen extension layer 60 is relatively farther away from the upper surface of the cover plate 10. Thus, the aforementioned visual contrast effect can be achieved.

[0075] Please refer to Figure 3 , Figure 3 The illustration shows a visual comparison of the electronic ink touch display module 2 according to the second embodiment of the present invention with other examples.

[0076] Figure 3 Two examples are shown, comparing the screen visual effects of the e-ink touch display module 2 with and without front light.

[0077] In the first example display module, a cover plate 10, a touch electrode layer 40, a light guide layer 80, and a display layer 70 are arranged sequentially from top to bottom. A shielding layer 20 is disposed on the lower surface of the cover plate 10, and a screen extension layer 60 is disposed between the light guide layer 80 and the display layer 70. In the second example display module, the order of the layers and the position of the shielding layer 20 are the same as in the first example; however, the screen extension layer 60 is disposed between the touch electrode layer 40 and the light guide layer 80. It is understood that in the above examples, there are adhesive layers between the layers, but for ease of understanding, they are not shown in the figures and will not be described further here.

[0078] In addition, Figure 3 In the diagram, the left side of all screen areas is the pixel area (i.e., the area of ​​the display layer that is not covered by the screen extension layer), the middle is the touch area (i.e., the area where the masking layer and the screen extension layer do not overlap), and the right side is the border area (i.e., the area formed by the masking layer).

[0079] from Figure 3 As can be seen in the first example with the front light on, the boundaries between the pixel area, touch area, and border area are too obvious, and the color difference between the pixel area and the touch area is significant. In the first example without the front light on, the overall visual effect is almost the same as the second embodiment. However, due to the poor visual performance in the first case, the overall effect of a narrow border is not good.

[0080] from Figure 3 As can be seen in the second example with the front light on, although the boundaries between the pixel area, touch area, and border area are improved, they are still noticeable, and the color difference between the pixel area and the touch area is also obvious. Furthermore, since the second example places the screen extension layer 60 on top of the light guide layer 80, a double-layer ink coating method is used to fabricate the screen extension layer 60 in order to properly cover the light transmitted by the light guide layer 80. However, the test results show that the screen extension layer 60 fabricated with a double-layer ink coating has stronger shielding properties (i.e., a larger OD value), which leads to inconsistent light output between the pixel area and the touch area (as shown in the figure, the touch area covered by the double ink layer appears darker than the pixel area when the front light is on). In addition, due to limitations in the double-layer ink coating process, the edges of the two ink layers cannot completely overlap; that is, there is a slight tolerance between the two ink layers. At this tolerance point (i.e., the boundary between the pixel area and the touch area), a halo effect occurs due to the light emitted by the front light system. In the second example, without the front light on, the boundary between the pixel area and the touch area is too obvious, and the overall effect is not a good narrow bezel visual effect.

[0081] Finally, from Figure 3 As can be seen from the diagram, in the second embodiment with the front light on, the boundaries between the pixel area, the touch area, and the border area are not obvious, and the color difference between the pixel area and the touch area is also not obvious. In the second embodiment without the front light on, the boundary between the pixel area and the touch area is also not very obvious. Therefore, in terms of overall visual performance, it has a good narrow border visual effect.

[0082] The above description illustrates the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention; any equivalent changes or modifications made without departing from the spirit disclosed in the present invention should be included in the following claims.

Claims

1. An electronic ink touch display module, comprising: The cover plate includes an upper surface and a lower surface; A shielding layer is disposed on the edge of the upper surface or the lower surface of the cover plate; A touch electrode layer is disposed below the cover plate; A display layer is disposed below the touch electrode layer and includes a screen area and a component connection area; as well as A screen extension layer is disposed between the touch electrode layer and the display layer and is configured to cover the component connection area. The screen extension layer is positioned away from the masking layer and adjacent to the display layer.

2. The electronic ink touch display module of claim 1, wherein, Part of the screen extension layer is not located within the vertical projection range of the shielding layer.

3. The electronic ink touch display module of claim 1, wherein, The component connection area is at least partially located within the vertical projection range of the screen extension layer and not within the vertical projection range of the shielding layer.

4. The electronic ink touch display module of claim 1, wherein, The ratio of the distance between the upper surface of the cover plate and the upper surface of the shielding layer and the distance between the upper surface of the cover plate and the upper surface of the screen extension layer is 1:1.04 to 2.

67.

5. The electronic ink touch display module according to claim 1, further comprising: A light guide layer is located between the cover plate and the touch electrode layer. The ratio of the distance between the upper surface of the cover plate and the upper surface of the shielding layer and the distance between the upper surface of the cover plate and the upper surface of the screen extension layer is 1:1.1 to 6.

6. The electronic ink touch display module of claim 1, wherein, The screen extension layer is printed on the lower surface of the touch electrode layer or on a surface flush with the upper surface of the display layer.

7. The electronic ink touch display module of claim 1, wherein, The optical density value of the screen extension layer is 1 to 2.

8. The electronic ink touch display module according to claim 1, wherein, The color difference (ΔE(Lab)) between the screen extension layer and the screen area is 0 to 2.

9. The electronic ink touch display module according to claim 1, wherein, The perceived brightness difference between the masking layer and the screen area is 30-45.

10. The electronic ink touch display module according to claim 1, wherein, The perceived brightness difference between the screen extension layer and the screen area display layer is 0 to 1.

Images