Use of computing devices is becoming more ubiquitous by the day. Computing devices range from standard desktop computers to wearable computing technology and beyond. One area of computing devices that has grown in recent years is flexible displays. Flexible displays may be moved to a bent configuration. Flexible screens may be fragile.
The subject matter claimed herein is not limited to implementations that solve any disadvantages or that operate only in environments such as those described above. Rather, this background is only provided to illustrate one exemplary technology area where some implementations described herein may be practiced.
In one implementation, a computing device is described. The computing device includes a flexible display including a thin film transistor matrix having a front surface and a back surface. A moveable display support is included and is connected to the back surface of the display and is configured to limit bending in one direction to a first bend radius while maintaining strain on the thin film transistor matrix below a predetermined amount of strain by elongating the moveable display support during bending.
In another implementation, a computing device is described. The computing device includes a flexible display having a front surface and a back surface. The computing device includes a moveable display support connected to the back surface of the display. The moveable display support is formed by a plurality of unit cells.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
Additional features and advantages will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the teachings herein. Features and advantages of the disclosure may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. Features of the present disclosure will become more fully apparent from the following description and appended claims, or may be learned by the practice of the disclosure as set forth hereinafter.
To describe the way the above-recited and other features of the disclosure can be obtained, a more particular description will be rendered by reference to specific implementations thereof which are illustrated in the appended drawings. For better understanding, the like elements have been designated by like reference numbers throughout the various accompanying figures. While some of the drawings may be schematic or exaggerated representations of concepts, at least some of the drawings may be drawn to scale. Understanding that the drawings depict some example implementations, the implementations will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
This disclosure generally relates to moveable display supports, computing devices using the same, and methods of use. More particularly, this disclosure generally relates to moveable display supports that are connected to a back surface of flexible light emitting displays such as organic light-emitting diode (OLED) displays or micro-LED displays.
As displays continue to get thinner, the risk of damaging the display increases. For example, the outer surface of a display may be soft, which may increase the risk of scratches. In another example, a display may not completely support the display and softer materials, such as foams, may be used to provide some support. However, these softer materials, may still allow for damage from bending beyond a minimum bend radius and/or normal loads. This often results in layers that are compressible which may make the display susceptible to point loads (e.g., finger-nails, digitizer pen tips, particles of dust) that may locally exceed a minimum bend radius of the display, which may result in the destruction of small areas of pixels. A minimum bend radius may include the minimum radius to which a display may be bent without destroying pixels.
Folding displays may also include the risk of damaging the display. Typically, foldable displays have a complex structure of (mostly plastic) layers. An electrode structure may be included in and/or near the middle and may include a water barrier layer on either side. The electrode structure and/or water barrier layers are typically inorganic and may crack when an applied stress (e.g., pressure or tension exerted on a material object) places the electrode structure and/or water barrier layers under strain (e.g., distortion of a material object caused by application of stress). The layers of a foldable display may form a stack. In at least some implementations, it may be desirable that the electrode structure should have as close to zero strain as possible. For example, when a display is folded beyond a minimum bend radius, plasticity (e.g., tendency to retain permanent deformation after application of stress) in the layers tends to retain the fold, which may result in buckling and/or creasing of the display surface. In some instances, this buckling and/or creasing may cause the display to extend above a chassis of the display. It may therefore be desirable to affix the display to a structure, to limit long term plastic deformation.
Fixing a display to a hard backing surface (e.g., a planar hard piece of plastic) may reduce risk of damage to the display until stress applied to the display exceeds the strain tolerance of the hard surface. However, for a foldable display, the hard backing surface may limit the ability of the display to fold. For example, a hard and thick sheet of plastic attached to a back surface of a foldable display may have a very large bend radius, which may significantly limit the bendability of the foldable display. Furthermore, such a large and thick sheet will have a neutral plane (zero strain layer) inside the sheet, so that when the assembly is folded, the display affixed to the external surface will suffer severe strain.
In at least one implementation, a moveable display support affixed to a display may be capable of supporting high normal loads while allowing the display to globally fold along a pre-determined path with low internal strain in the display. In at least one implementation, a moveable display support may facilitate curvature over a pre-defined radius without exceeding the pre-defined radius and/or providing support against point loads.
In at least one implementation, the moveable display support may provide added stiffness to resist normal forces. In at least one implementation, the moveable display support expands along its length when rolled to maintain the zero-strain condition of the display. In at least one implementation, a computing device may be capable of resisting point loads of less than 500 grams over a 0.39 mm2 area. In at least one implementation, the moveable display support includes elements that are linked like chain mail with particular bends to limit motion in two directions.
A display may have a theoretical zero-strain plane that extends through the transistor layer of the display. The zero-strain plane has a theoretical thickness of zero. In the real world, maintaining the display with near zero-strain may include preventing the application of more than a predetermined amount of strain. In at least one implementation, a moveable display support may prevent the display from experiencing more than a predetermined amount of strain. In some implementations, the predetermined amount of strain may be in a range having an upper value, a lower value, or upper and lower values including any of less than 2.0%, less than 1.5%, less than 1.0%, less than 0.75%, less than 0.50%, less than 0.25%, less than 0.10%, less than 0.05%, or any value therebetween. For example, the predetermined amount of strain may be less than 2.0%. In other examples, the predetermined amount of strain may be less than 1.0%. In further examples, the predetermined amount of strain may be less than 0.50%. In yet other examples, the predetermined amount of strain may be in a range of 0.05% to 2.0%. In yet further examples, the predetermined amount of strain may be in a range of 0.05% to 1.5%.
The computing device 100 may include a flexible display 110 and a moveable display support 120. The display 110 may be an OLED display that may include a thin film transistor matrix. In other examples, the flexible display 110 may include a micro LED display, a LCD display, an electrophoretic display, other flexible displays, or combinations thereof. The display 110 may have a minimum bend radius without additional support.
The display 110 is flexible and may be biased toward the planar configuration shown in
The display 110 may include a front surface 112 and a back surface (not shown). The moveable display support 120 may be connected to the back surface of the display 110. For example, the moveable display support 120 may be attached (e.g., adhered, affixed, mechanically connected) to the back surface of the display 110. In some implementations, the moveable display support 120 may be attached to the entire back surface of the display 110. In other implementations, the moveable display support 120 may include attachment points that are spaced about the back surface of the display 110. For example, the attachment points may be spaced such that the display 110 is capable of withstanding applied normal forces above a predetermined amount. Supporting the display 110 may provide the support necessary to prevent point load damage to the display 110.
In some implementations, the moveable display support 120 may limit motion (e.g., bending) in one direction to a first bend radius and/or may limit bending in another direction to a second bend radius. For example, in the implementation of
In other implementations, the first bend radius may be in a range having an upper value, a lower value, or upper and lower values including any of infinity, 10 mm, 5 mm, 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm, or any value therebetween. For example, the first bend radius may be infinity (e.g., may remain flat). In other examples, the first bend radius may be less than 10 mm. In further examples, the first bend radius may be greater than 0.5 mm.
In yet other examples, the first bend radius may be in a range of 0.5 mm to 10 mm. In yet further examples, the first bend radius may be in a range of 0.5 mm to 10 mm and/or infinity.
In other implementations, the second bend radius may be in a range having an upper value, a lower value, or upper and lower values including any of infinity, 2,000 mm, 1,500 mm, 1,000 mm, 500 mm, 250 mm, 100 mm, 50 mm, 25 mm, 10 mm, 5 mm, 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, 0.5 mm, or any value therebetween. For example, the second bend radius may be infinity (e.g., may remain flat). In other examples, the second bend radius may be less than 5 mm. In further examples, the second bend radius may be greater than 0.5 mm. In yet other examples, the second bend radius may be in a range of 0.5 mm to 4 mm. In yet further examples, the second bend radius may be in a range of 1,000 mm to infinity.
Therefore, the first bend radius and the second bend radius may be selected to determine a first configuration and a second configuration. For example, the first configuration may be planar (e.g., with an infinite first bend radius) and the second configuration may curved with, in some implementations, a second bend radius of less than 4 mm. In another example, the first configuration may be curved such that the front surface 112 is concave and may have a first bend radius of less than 4 mm and the second configuration may be curved such that the back surface is concave and may have a second bend radius of less than 4 mm.
The first and/or second bend radius may be selected to prevent bending of the display 110 beyond a first and/or second maximum bend radius. For example, the maximum bend radius of a display 110 may be 3 mm and the first and/or second bend radius of the moveable display support 120 may be greater than the maximum bend radius of the display (e.g., greater than 3 mm). Example moveable display supports are provided below.
Although bend radii are described above as applying to the bending of the entire display 110, bend radii are also applicable for point or other normal loads applied to a surface of the display 110. For example, if a stylus (not shown) were pressed against the display, the moveable display support 120 may provide support to the display 110 to prevent the transistor layer exceeding a minimum bend radius (e.g., preventing the stylus from puncturing the display 110). This support may be provided in a planar state, a bent state, an intermediate state, or combinations thereof.
The display 110 may have a dimension 111. As shown, the dimension 111 is a width. In other implementations, the dimension 111 may be a length, a diagonal, a perimeter, a radius, a diameter, or other major dimension. The dimension 111 may extend from a first edge 116 to a second edge 118 of the display 110. The moveable display support 120 may extend between the first edge 116 and the second edge 118 of the display 110.
The moveable display support 120 may have a dimension (not labeled) that corresponds with the dimension 111 of the display 110. As shown, the dimension of the moveable display support 120 is the width of the moveable display support 120. In another example, if the dimension 111 of the display 110 is the length, then the dimension of the moveable display support 120 is also the length, etc. The dimension of the moveable display support 120 (e.g., width), in the present implementation, is the same as the dimension 111 of the display 110. In other words, the width of the display 110 and the width of the moveable display support 120 are the same. In other implementations, the dimension of the moveable display support 120 may be smaller than the dimension 111 of the display 110.
For example, the dimension of the moveable display support 120 may be a portion of the dimension 111. In other implementations, the dimension of the moveable display support 120 may be a percentage of the dimension 111 in a range having an upper value, a lower value, or upper and lower values including any of within 75%, 80%, 85%, 90%, 95%, 97.5%, 98%, 98.5%, 99%, 99.5%, 99.75%, 99.9%, 99.95% of the dimension 111 of the display 110, or any value therebetween. For example, the distance may be less than 99.95% of the dimension. In other examples, the distance may be greater than 0.05% of the dimension 111. In yet other examples, the distance may be in a range of 25% to 0.05% of the dimension 111.
In implementations where the dimension of the moveable display support 120 is smaller than the dimension 111 of the display 110, the moveable display support 120 may extend within 5% of the dimension 111 to the first edge 116 and/or the second edge 118 of the display 110. In other words, the distance between an edge (not shown) of the moveable display support 120 and the first edge 116 and/or second edge 118 of the display may be less than 5% of the dimension 111 of the display. In other implementations, the distance may be in a range having an upper value, a lower value, or upper and lower values including any of within 25%, 20%, 15%, 10%, 7.5%, 5%, 3%, 2%, 1%, 0.5%, 0.25%, 0.1%, 0.05% of the dimension 111 of the display 110, or any value therebetween. For example, the distance may be less than 25% of the dimension. In other examples, the distance may be greater than 0.05% of the dimension 111. In yet other examples, the distance may be in a range of 25% to 0.05% of the dimension 111.
As shown, the front surface 112 of the display 110 may be entirely unobstructed. In other words, the front surface 112 is the outermost surface on the front side of the display 110. In other implementations, a portion of the front surface 112 may be obstructed. For instance, a cover (not shown) may extend partially around the front surface 112. In some implementations, a majority of the front surface 112 may be unobstructed.
In some implementations, the display layer 130 may be an OLED layer and may include a thin film transistor matrix. The second front layer 112-1 and/or the second back layer 114-1 may be barrier layer(s).
As shown in
The moveable display support 220 may include a plurality of support elements 260. As shown, the moveable display support 220 includes five support elements 260-1, 260-2, 260-3, 260-4, 260-5. The support elements 260 may cooperate to limit bending about the back surface 214 of the display 210.
As shown, the support elements 260 limit bending about the back surface 214 of the display 210 to an infinite bend radius (e.g., planar). However, the support elements 260 are not capable of limiting movement of the display 210 beyond a radius of curvature 221, as shown in
The moveable display support 320 includes a plurality of support elements 360. The support elements 360 may interlock. The plurality of support elements 360 may cooperate to form interlocking unit cells 350. The support elements 360 may include a plurality of pivots 352 and a plurality of links 354.
As shown, the moveable display support 320 includes three interlocking unit cells 350-1, 350-2, 350-3. The first unit cell 350-1 may be connected to the second unit cell 350-2 by the third link 352-3. The second unit cell 350-2 may be connected to the third unit cell 350-3 by the first link 352-1.
The first unit cell 350-1 is formed by ninth link 354-9, tenth link 354-10, eleventh link 354-11, and twelfth link 354-12. Ninth link 354-9 is connected to tenth link 354-10 by eighth pivot 352-8, tenth link 354-10 is connected to eleventh link 354-11 by ninth pivot 352-9, eleventh link 354-11 is connected to twelfth link 354-12 by tenth pivot 352-10, and twelfth link 354-12 is connected to ninth link 354-9 by third pivot 352-3.
The second unit cell 350-2 is formed by first link 354-1, second link 354-2, third link 354-3, and fourth link 354-4. First link 354-1 is connected to second link 354-2 by second pivot 352-2, second link 354-2 is connected to third link 354-3 by third pivot 352-3, third link 354-3 is connected to fourth link 354-4 by fourth pivot 352-4, and fourth link 354-4 is connected to first link 354-1 by first pivot 352-1.
The third unit cell 350-3 is formed by fifth link 354-5, sixth link 354-6, seventh link 354-7, and eighth link 354-8. Fifth link 354-5 is connected to sixth link 354-6 by fifth pivot 352-5, sixth link 354-6 is connected to seventh link 354-7 by sixth pivot 352-6, seventh link 354-7 is connected to eighth link 354-8 by seventh pivot 352-7, and eighth link 354-8 is connected to fifth link 354-5 by first pivot 352-1.
The fourth link 354-4 and the eighth link 354-8 are directly connected to each other such that the angle 351-1 between the fourth and eighth links 354-4, 354-8 does not change. The angle 351-1 may be determined to control angles 361, 363 (shown in
As shown in
Unlike the moveable display support 220 of the implementation of
As shown in
The moveable display support 320 may bend parallel to one or more rows 362. In other words, the moveable display support 320 may act as a hinge. In some implementations, the moveable display support 320 may only bend parallel to one or more rows 362. In other implementations, the moveable display support 320 may bend transversely to one or more rows 362. For instance, the moveable display support 320 may bend about lines and/or curves that are not parallel to one or more rows 362.
The plurality of support elements 460 include a first support element 460-1, a second support element 460-2, a third support element 460-3, and a fourth support element 460-4. The plurality of support elements 460 may be interconnected by pivots 452. Links (not labeled) may extend between pivots 452. Pivots 452 may include pins, flexures, or other pivots. Support elements 460 may cooperate to form unit cells. For example, the first support element 460-1, the second support element 460-2, the third support element 460-3, and the fourth support element 460-4 may cooperate to form a first unit cell 450-1.
The first support element 460-1 is connected to the second support element 460-2 by a first pivot 452-1. The first support element 460-1 is connected to the fourth support element 460-4 by a second pivot 452-2. The third support element 460-3 is connected to the fourth support element 460-4 by a third pivot 452-3. The second support element 460-2 is connected to the third support element 460-3 by a fourth pivot 452-4.
The pivots 452 may be separated by distances (e.g., distances 465, 467) and/or angles (e.g., angle 461). A first angle 461-1 may be formed between the first support element 460-1 and the second support element 460-2 about the first pivot 452-1.
The first angle 461-1 may increase from the planar configuration of
Similar to the implementation of a moveable display support 320 of
Support elements 460 may include stop surfaces 456, 457, 458, 459. Stop surfaces 456, 457, 458, 459 may cooperate to limit the motion (e.g., bending) of a moveable display support (e.g., moveable display support 420).
For example, in the planar configuration of
The moveable display support 420 may bend parallel to one or more rows 462. In other words, the moveable display support 420 may act as a hinge. In some implementations, the moveable display support 420 may only bend parallel to one or more rows 462. In other implementations, the moveable display support 420 may bend transversely to one or more rows 462. For instance, the moveable display support 420 may bend about lines and/or curves that are not parallel to one or more rows 462.
Linking unit cells 550 may allow for movement of between unit cells 550. The unit cells 550 may include stop surfaces 556, 557. As shown in
Referring briefly to
The first unit cell 550-1 is in a first row 562-1 (with unit cells 550-3, 550-5, 550-7, 550-9, 550-11, 550-13, 550-15) and the second unit cell 550-2 is in a second row 562-2 (with unit cells 550-2, 550-4, 550-6, 550-8, 550-10, 550-12, 550-14, 550-16). The first unit cell 550-1 and the second unit cell 550-2 are in a first column 564-1 (with additional unit cells 550 as shown in
The moveable display support 520 may bend parallel to one or more rows 562. In other words, the moveable display support 520 may act as a hinge. In some implementations, the moveable display support 520 may only bend parallel to one or more rows 562. In other implementations, the moveable display support 520 may bend transversely to one or more rows 562. For instance, the moveable display support 520 may bend about lines and/or curves that are not parallel to one or more rows 562.
In other implementations, fewer than all unit cells 550 in a row may be interconnected. For instance, first unit cell 550-1 and third unit cell 550-3 may be interconnected while third unit cell 550-3 is not interconnected with the fifth unit cell 550-5.
Similar to the implementations of a moveable display support 320, 420 of
The unit cells 550 may include stop surfaces (e.g., stop surfaces 556, 557). One or more stop surfaces may limit movement of the moveable display support 520 beyond the planar configuration. In other words, as shown in
The unit cells 550 may include stop surfaces (e.g., stop surfaces 556, 557). One or more stop surfaces may limit movement of the moveable display support 520 beyond the bent configuration. In other words, as shown in
Similar to the implementations of a moveable display support 320, 420, 520, of
The unit cells 650 may include stop surfaces 656, 657. As shown in
Referring briefly to
The first unit cell 650-1 is in a first row 662-1 (with unit cells 650-3, 650-5, 650-7, 650-9, 650-11, 650-13, 650-15, 650-17, 650-19, 650-21) and the second unit cell 650-2 is in a second row 662-2 (with unit cells 650-2, 650-4, 650-6, 650-8, 650-10, 650-12, 650-14, 650-16, 650-18, 650-20, 650-22). The first unit cell 650-1 and the second unit cell 650-2 are in a first column 664-1 (with additional unit cells 650 as shown in
The moveable display support 620 may bend parallel to one or more rows 662. In other words, the moveable display support 620 may act as a hinge. In some implementations, the moveable display support 620 may only bend parallel to one or more rows 662. In other implementations, the moveable display support 620 may bend transversely to one or more rows 662. For instance, the moveable display support 620 may bend about lines and/or curves that are not parallel to one or more rows 662.
In other implementations, fewer than all unit cells 650 in a row may be interconnected. For instance, first unit cell 650-1 and third unit cell 650-3 may be interconnected while third unit cell 650-3 is not interconnected with the fifth unit cell 650-5.
The unit cells 650 may include stop surfaces (e.g., stop surfaces 656, 657). One or more stop surfaces may limit movement of the moveable display support 620 beyond the planar configuration. In other words, as shown in
The unit cells 650 may include stop surfaces (e.g., stop surfaces 656, 657). One or more stop surfaces may limit movement of the moveable display support 620 beyond the bent configuration. In other implementations, the unit cells 650 may be designed for a different bend radius (e.g., an infinite bend radius like the first, planar configuration).
The articles “a,” “an,” and “the” are intended to mean that there are one or more of the elements in the preceding descriptions. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Additionally, it should be understood that references to “one implementation” or “an implementation” of the present disclosure are not intended to be interpreted as excluding the existence of additional implementations that also incorporate the recited features. For example, any element described in relation to an implementation herein may be combinable with any element of any other implementation described herein. Numbers, percentages, ratios, or other values stated herein are intended to include that value, and also other values that are “about” or “approximately” the stated value, as would be appreciated by one of ordinary skill in the art encompassed by implementations of the present disclosure. A stated value should therefore be interpreted broadly enough to encompass values that are at least close enough to the stated value to perform a desired function or achieve a desired result. The stated values include at least the variation to be expected in a suitable manufacturing or production process, and may include values that are within 5%, within 1%, within 0.1%, or within 0.01% of a stated value.
A person having ordinary skill in the art should realize in view of the present disclosure that equivalent constructions do not depart from the spirit and scope of the present disclosure, and that various changes, substitutions, and alterations may be made to implementations disclosed herein without departing from the spirit and scope of the present disclosure. Equivalent constructions, including functional “means-plus-function” clauses are intended to cover the structures described herein as performing the recited function, including both structural equivalents that operate in the same manner, and equivalent structures that provide the same function. It is the express intention of the applicant not to invoke means-plus-function or other functional claiming for any claim except for those in which the words ‘means for’ appear together with an associated function. Each addition, deletion, and modification to the implementations that falls within the meaning and scope of the claims is to be embraced by the claims.
It should be understood that any directions or reference frames in the preceding description are merely relative directions or movements. For example, any references to “front” and “back” or “top” and “bottom” or “left” and “right” are merely descriptive of the relative position or movement of the related elements.
The present disclosure may be embodied in other specific forms without departing from its spirit or characteristics. The described implementations are to be considered as illustrative and not restrictive. The scope of the disclosure is, therefore, indicated by the appended claims rather than by the foregoing description. Changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.