Display module

Abstract

A display module is disclosed comprising a panel (11) having a touch surface (12) extending in a plane (p), a support (13) comprising a plurality of display module walls (30) enclosing a film stack (22) and a backlight (50); the film stack (22) having at least one film (24) with one or more tabs (26) extending outside the display module walls (30); and a plurality of slits (32) in the display module walls (30) configured to receive the tabs (26) A touch-sensing apparatus comprising the display module, and a related method of assembling a display module is disclosed.

Description

[0001] Display Module

[0002] Field

[0003] The technology relates to the field of electronic displays, specifically focusing on the design and assembly of display modules used in various electronic devices such as televisions, computer monitors, and other display systems. This field involves the development of components and methods for improving the performance, durability, and assembly efficiency of display modules.

[0004] Background

[0005] Display modules are essential components in various electronic devices, such as televisions, computer monitors, and smartphones. These modules typically consist of a backlight and an LCD open cell panel, which work together to produce the images seen on the screen. Within the display module, a stack of films is used to enhance the image quality and ensure proper functioning of the display. These films must be precisely positioned and aligned within the module to achieve optimal performance.

[0006] In conventional display modules, the positioning and alignment of the film stack are achieved through the use of pins and tabs. The tabs are located along the perimeter of the films, and each tab has a hole that fits over a corresponding pin within the display module structure. These pins and tabs are typically located completely inside the walls of the display module, which contributes to the overall size of the module.

[0007] As electronic devices continue to evolve, there is an increasing demand for thinner and more compact display modules. However, the presence of pins and tabs within the walls of the display module presents a challenge in reducing the overall size of the module. The internal placement of these components requires additional space to accommodate them, which in turn increases the size of the display module. This increased size can limit the design possibilities for electronic devices and may result in devices that are bulkier and less aesthetically pleasing. In light of these challenges, there is a need for an improved display module design that reduces the overall size of the module while maintaining proper positioning and alignment of the film stack. Additionally, a more efficient assembly process for display modules would be beneficial in reducing manufacturing costs and improving the quality of the final product.

[0008] Summary

[0009] According to a first aspect of the disclosure, a display module is provided that comprises a panel having a touch surface extending in a plane, a support comprising a plurality of display module walls enclosing a film stack and a backlight. The film stack has at least one film with one or more tabs extending outside the display module walls. A plurality of slits in the display module walls configured to receive the tabs. This configuration allows for a compact and efficient design, reducing the internal space needed for the film stack and improving the overall performance of the display module.

[0010] Optionally in some examples, the display module comprises a cavity for emitters and / or detectors, wherein the cavity extends along sides of the panel, wherein the one or more tabs extends into the cavity.

[0011] Optionally in some examples, the support is configured to support the panel.

[0012] Optionally in some examples, the support is configured to support a rear surface the panel opposite the touch surface.

[0013] Optionally in some examples, the support is attached to the rear surface.

[0014] Optionally in some examples, the support comprises a panel carrier portion which is attached to the rear surface and which is arranged between the one or more tabs and the panel along a direction which is perpendicular to the plane.

[0015] Optionally in some examples, the panel carrier portion and the display module walls are an integral piece of material. Optionally in some examples, the support is a plurality of elongated frame elements arranged outside a perimeter of the backlight.

[0016] Optionally in some examples, the display module comprises a substrate for emitters and / or detectors, wherein the substrate is arranged between the one or more tabs and the panel along a direction which is perpendicular to the plane.

[0017] Optionally in some examples, the display module comprises a substrate for emitters and / or detectors, wherein the one or more tabs is arranged between the substrate and the panel along a direction which is perpendicular to the plane.

[0018] Optionally in some examples, the slits in the display module walls create pins for fitting the tabs. This feature provides a secure and precise positioning of the film within the display module, ensuring optimal performance and reducing the risk of misalignment or damage to the film.

[0019] Optionally in some examples, the pins are cylindrical protrusions formed when the slits are cut into the display module walls. This design provides a robust and durable connection between the film and the display module, ensuring long-term reliability and performance.

[0020] Optionally in some examples, the pins are tabs or posts left standing after the slits are created. This alternative design provides additional flexibility in the manufacturing process, allowing for different methods of creating the pins and accommodating different types of films and tabs.

[0021] Optionally in some examples, the display module further comprises one or more gaskets positioned in the slits of the display module walls to make the display module dust tight. This feature enhances the durability and longevity of the display module by protecting the internal components from dust and other contaminants.

[0022] Optionally in some examples, the gaskets are made of a material selected from the group consisting of Poron, rubber, silicone, neoprene, foam, polyurethane, EPDM rubber, PVC, and TPE. This wide range of material options allows for customization of the display module to suit specific environmental conditions and performance requirements.

[0023] Optionally in some examples, the film stack is configured to modify and improve the quality of light emitted from the display module. This feature enhances the visual quality of the display, providing a more vibrant and clear image for the user.

[0024] Optionally in some examples, the backlight is positioned behind an LCD open cell panel to illuminate the LCD open cell panel. This configuration ensures uniform and efficient illumination of the display, enhancing the overall visual quality and performance of the display module.

[0025] Optionally in some examples, the backlight is an edge-lit PPMA lightguide. This type of backlight provides a thin and flexible light source that offers uniform light distribution, contributing to the high-quality visual output of the display module.

[0026] Optionally in some examples, the backlight is a direct light element with mounted LEDs. This alternative design provides a highly efficient and bright light source, enhancing the visibility and clarity of the display even in bright ambient light conditions.

[0027] Optionally in some examples, the slits in the display module walls are between 2mm and 4 mm wide. This specific size range ensures a secure fit for the tabs, providing stability and precision in the positioning of the film within the display module.

[0028] Optionally in some examples, the slits in the display module walls are spaced between 2mm and 4 mm apart. This spacing allows for optimal distribution of the tabs and the film within the display module, ensuring uniform light distribution and high-quality visual output.

[0029] Optionally in some examples, the display module comprises a side cover attached to the support and arranged to extend around sides of the panel. According to a second aspect of the disclosure, a touch-sensing apparatus is provided comprising a display module according to the first aspect.

[0030] According to a third aspect of the disclosure, a method of assembling a display module is provided. The method comprises providing a support comprising a plurality of display module walls, positioning a film stack above the support, aligning tabs of at least one film of the film stack with a set of slits in the display module walls, and lowering the film stack onto pins created by the slits so that the tabs are fitted over respective pins and the film stack is coupled to the support, wherein the tabs extend outside the display module walls. This method provides a systematic and efficient approach to assembling the display module, ensuring high-quality assembly and optimal performance of the display module.

[0031] Optionally in some examples, the method comprises arranging emitters and detectors in a cavity extending along the display module walls, wherein the emitters and detectors are arranged to emit and receive light across a panel for touch detection in a touch-sensing apparatus, wherein the one or more tabs extends into the cavity.

[0032] Optionally in some examples, the method comprises attaching the support to a rear surface of a panel of the display module.

[0033] Brief Description of the Drawings

[0034] Examples are described in more detail below with reference to the appended drawings.

[0035] Figure 1 is a perspective view of a display module wall with two slits creating a pin over which a film tab has been placed, and the tab extends outside of the display module walls.

[0036] Figure 2 is a view of a film stack with tabs extending from its edges.

[0037] Figure 3 is a view of the film stack with tabs positioned over the pins created by slits in the display module wall.

[0038] Figure 4 is a side view of an assembled touch module, showing the film tab extending outside the touch module walls. Figures 5a-b are schematic illustrations of a display module, in a perspective view and a side view, respectively, according to an example of the disclosure, where a first cross-section is shown, through a tab of a film extending outside display module walls of a support.

[0039] Figure 5c is a further perspective view of the display module in Figures 5a-b.

[0040] Figure 6 is a further side view of the display module in Figures 5a-c, where a second cross-section is shown, through fixation elements attached to a support of the display module.

[0041] Figures 7a-b are schematic illustrations of a display module, in a perspective view and a side view, respectively, according to an example of the disclosure, where a first cross-section is shown, through a tab of a film extending outside display module walls of a support.

[0042] Figure 7c is a further perspective view of the display module in Figures 7a-b.

[0043] Figure 8 is a further side view of the display module in Figures 7a-c, where a second cross-section is shown, through fixation elements attached to a support of the display module.

[0044] Figure 9 is a schematic illustration of a display module, in a side view, according to an example of the disclosure.

[0045] Figures 10a-b show flow-charts of a method of assembling a display module. Figure 11 shows a further flow-chart of a method of assembling a display module.

[0046] Detailed Description

[0047] The detailed description set forth below provides information and examples of the disclosed technology with sufficient detail to enable those skilled in the art to practice the disclosure.

[0048] Figure 1 shows a perspective view of a portion of a display module 10 comprising a display module wall 30 with two slits 32 creating a pin 33 over which a film tab 26 has been placed. The tab 26 extends outside of the display module walls 30.

[0049] Figure 2 presents a view of a film stack 22 with tabs 26 extending from its edges. Figure 3 illustrates a view of the film stack 22 with tabs 26 positioned over the pins 33 created by the slits 32 in the display module wall 30. The slits 32 are configured to receive the tabs 26 and create pins for fitting the tabs 26. The pins 33 can be cylindrical protrusions formed when the slits 32 are cut into the display module walls 30 or tabs or posts left standing after the slits 32 are created.

[0050] Figure 4 displays a side view of an assembled touch module of a touch-sensing apparatus 100, showing the tab 26 of the film 24 extending outside the display module walls 30. The assembled touch module thus comprises the display module 10 which comprises the display module walls 30, the film stack 22, and a backlight 50. A gasket 40 can be positioned in the slits 32 of the display module walls 30 to make the display module dust tight. The backlight 50 is positioned behind an LCD open cell panel 20 to illuminate the LCD open cell panel 20.

[0051] Figure 9 is a schematic illustration of a display module 10, in a side view, according to an example. The display module 10 comprises a panel 11 having a touch surface 12 extending in a plane (p). The display module 10 comprises a support 13. The support comprises a plurality of display module walls 30 enclosing a film stack 22 and a backlight 50. The film stack 22 has at least one film 24 with one or more tabs 26 extending outside the display module walls 30. A plurality of slits 32 in the display module walls 30 are configured to receive the tabs 26. The slits 32 may create an extension or pin 33 which fits through an opening 94 in the tab 26, as indicated in the example of figure 1 .

[0052] Part of the film stack 22, i.e. the tabs 26, thus extends though or beyond the display module walls 30. This in turn allows positioning of the support 13 further inwards from sides 93 of the panel 11 , i.e. further towards a center of the panel 11 in a direction of the plane (p). This reduces the amount of material and / or number of components which extends beyond sides 93 of the panel 11 , since more room is created for e.g. emitters 61 / detectors 62 and substrate 60 by shifting part of the support 13 inwards from sides 93. A more compact dimension such as a smaller bezel may thus be provided around the panel 11 , besides from the facilitated alignment provided by the tabs 26 interlocking with the slits 32 in the display module walls 30 of the support 13. Figures 5 - 8, as described in more detail below, show further examples of a display module 10 where a plurality of slits 32 in the display module walls 30 are configured to receive the tabs 26, so that the tabs 26 extend outside the display module walls 30.

[0053] Turning again to the example of figure 9, the display module 10 may comprise a cavity 97 for emitters 61 and / or detectors 62. The cavity 97 extends along sides 93 of the panel 11 , as well as along the display module walls 30. The one or more tabs 26 may extend into the cavity 97, as exemplified in figure 9. This provides for further maximizing the use of available space in a direction parallel to the plane (p) of the panel 11 . Space in the cavity 97 may be utilized to accommodate part of the film 24. A more compact profile such as a smaller bezel may thus be provided around the panel 11 , in addition to providing a facilitated alignment of the film stack 22. A further side frame 98 may be provided around the sides 93 of the panel 11 , which may define the cavity 97 together with the support 13. The emitters 61 and detectors 62 may be arranged to emit and receive light across the panel 11 for touch detection. A touch-sensing apparatus 100 is thus also provided according to an example, comprising the display module 10.

[0054] The support 13 in the example of figure 9 may be configured to stabilize the panel 11 and increase the structural integrity of the display module 10. The support 13 may in one example extend across the panel 11 . The support 13 may in some examples be arranged as a rear cover of the display module 10. A further support element 99 may be arranged between the support 13 and the panel 11 for a stabilizing force transfer therebetween. A transparent element 89 may be arranged between the emitters 61 / detectors 62 and the panel 11 , as exemplified in figure 9. The tabs 26 are preferably positioned to not interfere with the light path between the emitters 61 / detectors 62 and the panel 11 .

[0055] Figures 5a - b are schematic illustrations of a display module 10, in a perspective view (5a) and a side view (5b), respectively, according to an example. The display module 10 comprises a panel 11 having a touch surface 12 extending in a plane (p). The support 13 is configured to support the panel 11 . Analogous to the example in figure 9, the support 13 comprises a plurality of display module walls 30 enclosing a film stack 22 and a backlight 50. The film stack 22 has at least one film 24 with one or more tabs 26 extending outside the display module walls 30, as schematically illustrated in the cross-sections of figures 5a - b. A plurality of slits 32 in the display module walls 30 are configured to receive the tabs 26, as further schematically illustrated in the perspective view of Figure 5c. The slits 32 may create an extension or pin 33 which fits through an opening 94 in the tab 26.

[0056] Besides from more compact dimensions such as a smaller bezel, and a facilitated alignment, the support 13 provides rigidity to the panel 11 and may thus serve as the main structural component of the display module 10, such as to resist bending and warping of the panel 11 , as well as maintaining a fixed position of the mentioned components of the display module 10. The support 13 accordingly provides for a direct stabilizing effect on the panel 11 , improved alignment of the film stack 22, and more compact dimensions such as a reduced bezel. Emitters 61 and detectors 62 may be arranged to emit and receive light across the panel 11 for touch detection. A touch-sensing apparatus 100 is thus also provided according to an example, comprising the display module 10.

[0057] The support 13 may be configured to support a rear surface 14 of the panel 11 opposite the touch surface 12. Figure 5a shows an example where the support 13 support a rear surface 14 of the panel 11 . The panel 11 may thus be held in place without having to provide a clamping force on the touch surface 12 of the panel 11 . This further enables the use of a floating side cover 92 which may be separated from edges or sides 93 of the panel 11 or do not apply any significant force onto the panel 11 . This further reduce the bezel size since the bezel does not need to provide any structural support to the panel 11 . The support 13 may be attached to the rear surface 14 of the panel 11 . The support 13 may be attached by glue to the rear surface 14. It is conceivable that an intermediate element such as an adhesive element 95 may be provided between the panel 11 and the support 13 to provide fixation therebetween.

[0058] The support 13 may comprise a panel carrier portion 70 which is attached to the rear surface 14 and which is arranged between the one or more tabs 26 and the panel 11 along a direction (n) which is perpendicular to the plane (p), as schematically illustrated in e.g. figures 5a - b. This provides for an effective and direct stabilizing effect on the panel 11 by the support 13, along with the accurate alignment of the film stack 22 as provided by the pins 33 and the tabs 26. The panel carrier portion 70 and the display module walls 30 may be an integral piece of material, i.e. formed from a single monolithic piece. This provides for a particularly robust display module 10 and accurate alignment of the film stack 22.

[0059] The support 13 may be a plurality of elongated frame elements 80 arranged outside a perimeter 90 of the backlight 50, as schematically illustrated in e.g. figure 5b. The frame elements 80 may extend along the sides of the display module 10. Figure 3 indicates that the support 13 may extend along the sides of the display module 10 in an analogous fashion. The elongated frame elements 80 support the panel 11 and the components of the display module 10 as previously described in relation to the support 13 above. The frame elements 80 being arranged outside a perimeter 90 of the backlight 50 reduces the thickness of the display module 10, along indicated direction (n), and dispense with the need for any further rear support structure, such as a separate rear cover for structural integrity purposes.

[0060] The display module 10 may comprise a substrate 60 for emitters 61 and / or detectors 62. The substrate 60 may be arranged between the one or more tabs 26 and the panel 11 along a direction (n) which is perpendicular to the plane (p), as schematically illustrated in figures 5a - b. In another example, the one or more tabs 26 may be arranged between the substrate 60 and the panel 11 along the direction (n) which is perpendicular to the plane (p), as schematically illustrated in figures 7a - b, as well as in figure 9. Figure 7c is a further perspective view indicating that the tab 26 is positioned below the substrate 60, as opposed to above the substrate 60 as indicated in figure 5c. It should be noted that figures 5c and 7c show the emitters 61 pointing downwards, compared to upwards in e.g. figures 5a and 7a.

[0061] The display module 10 may comprise a side cover 92 attached to the support 13 and arranged to extend around sides 93 of the panel 11 , as schematically illustrated in e.g. figure 6. Figure 6 is a further side view of the display module in figures 5a-c, where a second cross-section is shown, through fixation elements 96 attached to the support 13. The fixation elements 96, such as screws, may attach the side cover 92 to the support 13. Figure 8 shows a similar example, where figure 8 is a further side view of the display module 10 in Figures 7a-c. The side cover 92 may be provide a compact profile and bezel around the sides 93, as enabled by the support 13 according to the description above.

[0062] A touch-sensing apparatus 100 is provided comprising a display module 10 as described above in relation to figures 1 - 9. The touch-sensing apparatus 100 thus provides for reduced bezel dimensions, an improved and facilitated alignment of the film stack 22, as well as a robust configuration.

[0063] Figure 10a is a flow-chart of a method 200 of assembling a display module 10. The method 200 comprises providing 201 a support 13 comprising a plurality of display module walls 30. The method 200 comprises positioning 202 a film stack 22 above the support 13. The method comprises aligning 203 tabs 26 of at least one film 24 of the film stack 22 with a set of slits 32 in the display module walls 30. The method 200 comprises lowering 204 the film stack 22 onto pins 33 created by the slits 32 so that the tabs 26 are fitted over respective pins 33 and the film stack 22 is coupled to the support 13, and where the tabs 26 extend outside the display module walls 30. The method 200 thus provides for the advantageous benefits as described above in relation to the display module 10 and figures 1 - 9. The method 200 further enables building the display module 10 in a ‘front-to-back’ fashion, where the panel 11 and the touch surface 12 being referred to as the ‘front’. This is beneficial from a product manufacturing perspective. For example, it is easier to keep the space between the open cell panel 20 and the film stack free from dust and contaminations, and it is not necessary to bring a separate and bulky rear cover structure into the clean room manufacturing line.

[0064] Figure 10b is a further flow-chart of the method 200 of assembling a display module 10. The method 200 may comprise arranging 205 emitters 61 and detectors 62 in a cavity 97 extending along the display module walls 30. The emitters 61 and detectors 62 may be arranged to emit and receive light across a panel 11 for touch detection in a touch-sensing apparatus 100. The one or more tabs 26 may extend into the cavity 97, as described above in relation to figure 9. Figure 11 is a further flow-chart of the method 200 of assembling a display module 10. The method 200 may comprise attaching 20T the support 13 to a rear surface 14 of a panel 11 of the display module 10, as described above in relation to e.g. figures 5a - c.

[0065] Further examples of the disclosure are described in the following.

[0066] 1. Display Module Details

[0067] The display module 10 may be configured to house various other components that work together to provide a high-quality display. The display module 10 may be rectangular in shape, although other shapes may be used depending on the specific application. The display module 10 comprises a plurality of display module walls 30. These walls 30 may securely hold components of the display module 10, such as the film stack 22, the backlight 50, and in some examples an LCD open cell panel 20. The walls 30 of the display module 10 may be made of a durable material that can withstand the heat generated by a backlight 50 and an LCD open cell panel 20. The material used for the walls 30 may also be chosen for its optical properties, such as its ability to reflect or absorb light, depending on the specific requirements of the display module 10.

[0068] 1.1. Film Stack

[0069] In some implementations, the film stack 22 is a component of the display module 10. The film stack 22 may modify and improve the quality of light emitted from the display module 10. The film stack 22 comprises one or more films 24, each of which may have different optical properties. For example, one film 24 in the film stack 22 may be configured to diffuse light, while another film 24 may be configured to polarize light. The specific configuration and composition of the film stack 22 can be varied to achieve the desired optical effects. The film stack 22 is typically positioned within the display module 10 such that it is in the path of light emitted by the backlight 50 and before it reaches the LCD open cell panel 20. This allows the film stack 22 to modify the light before it is used to create the display on the LCD open cell panel 20. In some examples, each film 24 in the film stack 22 is a thin, flexible sheet of material with specific optical properties. The material used for the film 24 may be chosen for its ability to transmit, reflect, absorb, polarize, or diffuse light. The film 24 may also be chosen for its durability, flexibility, and resistance to heat and other environmental factors. The film 24 is typically cut to the same size as the display module 10, although it may be slightly larger or smaller depending on the specific design of the display module 10. The film 24 may also be shaped to fit the specific contours of the display module 10.

[0070] In some implementations, at least one film 24, or a plurality of films 24, or each film 24 in the film stack 22 comprises one or more tabs 26. These tabs 26 are small extensions of the film 24 that film 24 are configured to allow the film 24 to be positioned with respect to the display module 10. The tabs 26 are typically located along the edges of the film 24 and extend outside the display module walls 30. This design reduces the internal space needed for the film stack 22, which can be beneficial in applications where space is at a premium. The tabs 26 are configured to fit over pins created by the slits 32 in the display module walls 30. This allows the film 24 to be securely positioned within the display module 10, while also allowing for easy removal and replacement of the film 24 if necessary.

[0071] 1 .2. Display Module Walls

[0072] In some examples, the display module walls 30 form part of an outer boundary of the display module 10. They are configured to enclose and protect the internal components of the display module 10, such as the LCD open cell panel 20, the film stack 22, and the backlight 50. In one configuration, the display module walls 30 comprise a plurality of slits 32. These slits 32 are narrow openings in the display module walls 30 that are configured to receive the tabs 26 of the film 24 in the film stack 22. The slits 32 create pins 33 for fitting the tabs 26, which allows the film 24 to be securely positioned within the display module 10. The slits 32 may be created using a precision cutting tool or laser, although other methods such as CNC milling, water jet cutting, wire EDM, stamping, die cutting, or plasma cutting may also be used. The size and spacing of the slits 32 can be varied depending on the specific design of the display module 10 and the film 24 in the film stack 22. For example, the slits 32 may be between 2-4 mm wide and spaced 2-4 mm apart.

[0073] 1.3. LCD Open Cell Panel

[0074] In some implementations, the LCD open cell panel 20 is a component of the display module 10. The LCD open cell panel 20 is a type of liquid crystal display that uses an open cell structure to create a high-quality, high-resolution display. The LCD open cell panel 20 may be positioned within the display module 10 such that it is in the path of light emitted by the backlight 50 and after it passes through the film stack 22. This allows the LCD open cell panel 20 to use the modified light from the film stack 22 to create the display. The LCD open cell panel 20 is typically secured to the display module 10 using a variety of methods, including adhesive bonding, mechanical fastening, or a combination of both.

[0075] 1 .4. Gaskets

[0076] In one example, the display module 10 comprises one or more gaskets 40. These gaskets 40 are configured to make the display module 10 dust tight, protecting the internal components of the display module 10 from dust and other particulates that could potentially interfere with the operation of the display module 10. The gaskets 40 may be positioned in the slits 32 of the display module walls 30. The gaskets 40 may be made of a variety of materials, including Poron, rubber, silicone, neoprene, foam, polyurethane, EPDM rubber, PVC, and TPE. The specific material used for the gaskets 40 may be chosen based on its ability to provide a tight seal, its resistance to heat and other environmental factors, and its compatibility with the other materials used in the display module 10.

[0077] 1.5. Backlight

[0078] In some examples, the backlight 50 is an integral component of the display module 10. The backlight 50 is configured to illuminate the LCD open cell panel 20, providing the light that is used to create the display. The backlight 50 may be positioned behind the LCD open cell panel 20 and the film stack 22. The backlight 50 may be an edge- lit PPMA lightguide, which is thin and flexible and provides uniform light distribution. Alternatively, the backlight 50 may be a direct light element with mounted LEDs. The specific design and configuration of the backlight 50 can be varied depending on the specific requirements of the display module 10.

[0079] 2. Assembly Of The Display Module Method Details

[0080] 2.1 . Securing the LCD Open Cell Panel

[0081] In one method, the assembly of the display module 10 begins with securing the LCD open cell panel 20 onto the display module 10. This can be done using a variety of methods, including adhesive bonding, mechanical fastening, or a combination of both. The LCD open cell panel 20 is typically positioned within the display module 10 such that it is in the path of light emitted by the backlight 50 and after it passes through the film stack 22.

[0082] 2.2. Positioning and Aligning the Film Stack

[0083] In some implementations, once the LCD open cell panel 20 is secured onto the display module 10, the next step in the assembly process is to position the tabs 26 of the film 24 in the film stack 22 onto the display module 10. This is done by aligning the tabs 26 with the slits 32 in the display module walls 30 and then lowering the film 24 onto the pins created by the slits 32. This allows the film 24 to be securely positioned within the display module 10, while also allowing for easy removal and replacement of the film 24 if necessary.

[0084] 2.3. Ensuring Secure Fit of Tabs over Pins and Centering

[0085] In one method, after the film stack 22 is lowered onto the pins created by the slits 32, the next step in the assembly process is to ensure that each tab 26 is securely fitted over a pin. This may be done by visually inspecting each tab 26 to ensure that it is properly fitted over a pin. If a tab 26 is not properly fitted over a pin, it may be necessary to adjust the position of the film 24 or the film stack 22 within the display module 10. This ensures that the film stack 22 is securely positioned within the display module 10, which is for the proper operation of the display module 10.

[0086] In some implementations, once each tab 26 is securely fitted over a pin, the next step in the assembly process may be to verify that the film stack 22 is level and centered on the display module 10. This may be done by visually inspecting the position of the film stack 22 within the display module 10. If the film stack 22 is not level or centered, it may be necessary to adjust the position of the film stack 22 within the display module 10. This ensures that the film stack 22 is properly positioned within the display module 10, which is for the proper operation of the display module 10.

[0087] 2.4. Confirmation of Tab Extension Outside Display Module Walls

[0088] In one example, after the position of the film stack 22 is verified, the next step in the assembly process is to confirm that the tabs 26 are extending outside the display module walls 30 as intended. This may be done by visually inspecting the position of the tabs 26 with respect to the display module walls 30. If the tabs 26 are not extending outside the display module walls 30 as intended, it may be necessary to adjust the position of the film 24 or the film stack 22 within the display module 10. This ensures that the tabs 26 are properly positioned, which is for the proper operation of the display module 10.

[0089] 2.5. Fitting of Gaskets in the Slits

[0090] In some examples, the final step in the assembly process is to fit the gaskets 40 in the slits 32 of the display module walls 30. This may be done by positioning the gaskets 40 in the slits 32 and then applying pressure to the gaskets 40 to create a snug fit. This ensures that the display module 10 is dust tight, protecting the internal components of the display module 10 from dust and other particulates that could potentially interfere with the operation of the display module 10.

[0091] 3. Description of Examples of the Disclosure

[0092] 3.1 . Example of Film Stack with Light Smoothing Feature In one example, the film stack 22 is configured to smooth the light emitted from the display module 10. This involves diffusing the light to eliminate hot spots and create a more uniform light distribution. The film stack 22 may comprise one or more films 24, each of which may have different optical properties. For example, one film 24 in the film stack 22 may be configured to diffuse light, while another film 24 may be configured to polarize light. The specific configuration and composition of the film stack 22 can be varied to achieve the desired light smoothing effects.

[0093] 3.1.1. Example of Backlight as PPMA Lightguide

[0094] In some implementations, the backlight 50 is an edge-lit PPMA lightguide. This type of backlight 50 is thin and flexible and provides uniform light distribution. The light from the backlight 50 first passes through the film stack 22, which modifies and improves the quality of the light. The modified light then reaches the LCD open cell panel 20, which uses the light to create the display. The specific design and configuration of the backlight 50 can be varied depending on the specific requirements of the display module 10.

[0095] 3.2. Example of Backlight as Direct Light Element with Mounted LEDs

[0096] In one example, the backlight 50 is a direct light element with mounted LEDs. This type of backlight 50 provides bright, clear light that is ideal for illuminating the LCD open cell panel 20. The light from the backlight 50 first passes through the film stack 22, which modifies and improves the quality of the light. The modified light then reaches the LCD open cell panel 20, which uses the light to create the display. The specific design and configuration of the backlight 50 can be varied depending on the specific requirements of the display module 10.

[0097] 3.2.1 . Example of Gaskets Made from Different Materials

[0098] In some implementations, the gaskets 40 can be made from a variety of materials, including Poron, rubber, silicone, neoprene, foam, polyurethane, EPDM rubber, PVC, and TPE. The specific material used for the gaskets 40 may be chosen based on its ability to provide a tight seal, its resistance to heat and other environmental factors, and its compatibility with the other materials used in the display module 10. This ensures that the display module 10 is dust tight, protecting the internal components of the display module 10 from dust and other particulates that could potentially interfere with the operation of the display module 10.

[0099] The terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes," and / or "including" when used herein specify the presence of stated features, integers, actions, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, actions, steps, operations, elements, components, and / or groups thereof.

[0100] It will be understood that, although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0101] Relative terms such as "below" or "above" or "upper" or "lower" or "horizontal" or "vertical" may be used herein to describe a relationship of one element to another element as illustrated in the Figures. It will be understood that these terms and those discussed above are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0102] It is to be understood that the present disclosure is not limited to the aspects described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the present disclosure and appended claims. In the drawings and specification, there have been disclosed aspects for purposes of illustration only and not for purposes of limitation, the scope of the disclosure being set forth in the following claims.

Claims

Claims1 . A display module (10) comprising: a panel (11 ) having a touch surface (12) extending in a plane (p), a support (13) comprising a plurality of display module walls (30) enclosing a film stack (22) and a backlight (50); the film stack (22) having at least one film (24) with one or more tabs (26) extending outside the display module walls (30); and a plurality of slits (32) in the display module walls (30) configured to receive the tabs (26).

2. The display module (10) according to claim 1 , comprising a cavity (97) for emitters (61 ) and / or detectors (62), wherein the cavity extends along sides (93) of the panel, wherein the one or more tabs extends into the cavity.

3. The display module (10) according to claim 1 , wherein the support is configured to support the panel.

4. The display module (10) according to claim 3, wherein the support is configured to support a rear surface (14) the panel opposite the touch surface.

5. The display module (10) according to claim 4, wherein the support is attached to the rear surface.

6. The display module (10) according to claim 5, wherein the support comprises a panel carrier portion (70) which is attached to the rear surface and which is arranged between the one or more tabs and the panel along a direction (n) which is perpendicular to the plane (p).

7. The display module (10) according to claim 6, wherein the panel carrier portion and the display module walls are an integral piece of material.

8. The display module (10) according to any of claims 2 - 7, wherein the support is a plurality of elongated frame elements (80) arranged outside a perimeter (90) of the backlight.

9. The display module (10) according to any of claims 2 - 8, comprising a substrate (60) for emitters (61 ) and / or detectors (62), wherein the substrate is arranged between the one or more tabs and the panel along a direction (n) which is perpendicular to the plane.

10. The display module (10) according to any of claims 1 - 8, comprising a substrate (60) for emitters (61 ) and / or detectors (62), wherein the one or more tabs is arranged between the substrate and the panel along a direction (n) which is perpendicular to the plane.11 . The display module (10) according to any of claims 1 - 10, wherein the slits (32) create pins (33) for fitting the tabs (26).

12. The display module (10) according to claim 11 , wherein the pins are cylindrical protrusions formed when the slits (32) are cut into the display module walls (30).

13. The display module (10) according to claim 11 , wherein the pins are tabs or posts left standing after the slits (32) are created.

14. The display module (10) according to any one of claims 1 to 13, further comprising one or more gaskets (40) positioned in the slits (32) of the display module walls (30) to make the display module dust tight.

15. The display module (10) according to claim 14, wherein the gaskets (40) are made of a material selected from the group consisting of Poron, rubber, silicone, neoprene, foam, polyurethane, EPDM rubber, PVC, and TPE.

16. The display module (10) according to any one of claims 1 to 15, wherein the film stack (22) is configured to modify and improve the quality of light emitted from the display module (10).

17. The display module (10) according to any one of claims 1 to 16, wherein the backlight (50) is positioned behind an LCD open cell panel (20) to illuminate the LCD open cell panel (20).

18. The display module (10) according to claim 17, wherein the backlight (50) is an edge-lit PPMA lightguide.

19. The display module (10) according to claim 17, wherein the backlight (50) is a direct light element with mounted LEDs.

20. The display module (10) according to any one of claims 1 to 19, wherein the slits (32) between 2mm and 4 mm wide.21 . The display module (10) according to any one of claims 1 to 20, wherein the slits (32) are spaced between 2mm and 4 mm apart.

22. The display module (10) according to any one of claims 1 to 21 , comprising a side cover (92) attached to the support and arranged to extend around sides (93) of the panel.

23. A touch-sensing apparatus (100) comprising a display module according to any of claims 1 - 22.

24. A method (200) of assembling a display module (10), the method comprising: providing (201 ) a support (13) comprising a plurality of display module walls (30), positioning (202) a film stack (22) above the support; aligning (203) tabs (26) of at least one film (24) of the film stack with a set of slits (32) in the display module walls (30); and lowering (204) the film stack onto pins (33) created by the slits (32) so that the tabs (26) are fitted over respective pins and the film stack is coupled to the support, wherein the tabs (26) extend outside the display module walls (30).

25. Method according to claim 24, comprising arranging (205) emitters (61 ) and detectors (62) in a cavity (97) extending along the display module walls, wherein the emitters and detectors are arranged to emit and receive light across a panel (11 ) for touch detection in a touch-sensing apparatus (100), wherein the one or more tabs extends into the cavity.

26. Method according to claim 24, comprising attaching (201 ’) the support to a rear surface (14) of a panel (11 ) of the display module.

Images