CN111221127B

CN111221127B - Near-to-eye display device

Info

Publication number: CN111221127B
Application number: CN202010074008.8A
Authority: CN
Inventors: 林国栋; 陈宪泓
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2019-07-31
Filing date: 2020-01-22
Publication date: 2023-02-03
Anticipated expiration: 2040-01-22
Also published as: TW202107150A; TWI811416B; CN111221127A

Abstract

The invention discloses a near-eye display device, which comprises a display panel and a vibration element, wherein the display panel comprises a plurality of pixels; the vibration element is arranged on the side of the display panel and vibrates to drive the display panel to vibrate, so that the pixels generate reciprocating displacement, wherein the vibration amplitude of the vibration element is less than 100 micrometers.

Description

Near-to-eye display device

Technical Field

The present invention relates to a near-to-eye display device, and more particularly, to a near-to-eye display device with reduced screen effect.

Background

Display devices often evaluate the display resolution by visually determining whether pixels are visible. When the pixel density is insufficient, the split line condition between pixels is visually observed just like looking at the rear of the screen, which is called "screen-door effect". Generally, as the viewing distance between the display device and the user increases, the number of pixels that can be seen by the user at a fixed viewing angle increases, making the screen effect less vivid. However, in applications such as near-eye display devices, e.g., virtual reality, the display device is almost placed close to the eyes of the user, so that the viewing distance is only several centimeters, which significantly reduces the number of pixels that can be seen at a fixed viewing angle, thereby highlighting the problem of "screen effect".

The prior art techniques for improving the screen effect form smaller pixels to increase the number of pixels per unit area. However, the smaller pixels are required to be matched with a higher-precision manufacturing process technology, such as a high-precision photolithography manufacturing process, so that the manufacturing process is difficult, the yield is difficult to control, the equipment requirement is relatively high, and the manufacturing cost is increased dramatically.

Disclosure of Invention

An objective of the present invention is to provide a near-to-eye display device, which utilizes vibration to improve a screen effect, so as to improve the display quality of the conventional display panel.

In one embodiment, the present invention provides a near-eye display device comprising a display panel and a vibration element, wherein the display panel comprises a plurality of pixels; the vibration element is arranged on the side edge of the display panel, and vibrates to drive the display panel to vibrate, so that the plurality of pixels generate reciprocating displacement, wherein the vibration amplitude of the vibration element is less than 100 mu m.

In one embodiment, the vibration amplitude is 50 μm or less. In another embodiment, the vibration amplitude is 10 μm or less.

In another embodiment, the present invention provides a near-eye display device comprising a display panel and a vibration element, wherein the display panel comprises a plurality of pixels, and a pixel pitch is formed between adjacent pixels; the vibration element is arranged on the side edge of the display panel and vibrates to drive the display panel to vibrate, so that the plurality of pixels are displaced, wherein the displacement distance of the plurality of pixels is less than or equal to the pixel distance.

In one embodiment, the displacement distance is equal to or greater than 1/2 of the pixel pitch.

In one embodiment, the vibration frequency of the vibration element is above 60 Hz. In another embodiment, the vibration frequency of the vibration element is above 120Hz.

In one embodiment, the near-eye display device further includes a control element, wherein the control element controls the vibration of the vibration element.

In an embodiment of the present invention, the near-eye display device further includes another vibration element, wherein the another vibration element is disposed on another side of the display panel opposite to the vibration element, the vibration element vibrates along a first direction, the another vibration element vibrates along a second direction, and the second direction intersects with the first direction.

In one embodiment, the vibrating element and the other vibrating element vibrate alternately, so that the plurality of pixels are displaced alternately in the first direction and the second direction, and the vibrating element and the other vibrating element have the same or different vibration frequencies.

In one embodiment, the near-eye display device further includes a lens, wherein the lens is disposed between the display panel and the user.

Compared with the prior art, the near-to-eye display device provided by the invention utilizes the vibration element to perform micro vibration so as to enable the pixels of the image to correspondingly displace and generate the pixel blooming effect, thereby reducing the division phenomenon among the pixels of the image and improving the display quality of the conventional display panel.

Drawings

Fig. 1 is a schematic diagram of a near-eye display device according to an embodiment of the invention;

FIG. 2 is a schematic diagram illustrating an operation of a near-eye display device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a near-eye display device according to another embodiment of the present invention;

fig. 4A is an operation diagram of a near-eye display device according to another embodiment of the invention;

FIG. 4B is a schematic view of a viewing image of the near-eye display device of FIG. 4A;

fig. 5 is a schematic diagram of a near-eye display device according to another embodiment of the invention.

Description of the symbols

10 near-to-eye display device

20 user

100 display panel

110 pixel

101A, 101B, 101C pixel unit

120 light blocking area

200X, 200Y vibration element

300 control element

400 lens

500 casing

510 accommodating space

DX and DY displacement distance

WX, WY Pixel Pitch

Detailed Description

In the drawings, the thickness of layers, films, panels, regions, etc. have been exaggerated for clarity. Like reference numerals refer to like elements throughout the specification. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physically and/or electrically connected. Further, "electrically connected" or "coupled" may mean that there are additional elements between the elements.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first element," "component," "region," "layer" or "portion" discussed below could be termed a second element, component, region, layer or portion without departing from the teachings herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms, including "at least one", unless the content clearly indicates otherwise. "or" means "and/or". 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" and/or "comprising," when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions integers, steps, operations, elements, components, and/or groups thereof.

Furthermore, relative terms, such as "lower" or "bottom" and "upper" or "top," may be used herein to describe one element's relationship to another element as illustrated. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in one of the figures is turned over, elements described as being on the "lower" side of other elements would then be oriented on "upper" sides of the other elements. Thus, the exemplary term "lower" can include both an orientation of "lower" and "upper," depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as "below" or "beneath" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "below" or "beneath" can encompass both an orientation of above and below.

As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable range of deviation of the specified value as determined by one of ordinary skill in the art, taking into account the measurement in question and the specified amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" may mean within one or more standard deviations of the stated value, or within ± 30%, ± 20%, ± 10%, ± 5%. Further, as used herein, "about", "approximately" or "substantially" may be selected based on optical properties, etch properties, or other properties, with a more acceptable range of deviation or standard deviation, and not all properties may be applied with one standard deviation.

Unless defined otherwise, 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 invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Exemplary embodiments are described herein with reference to cross-sectional views that are schematic illustrations of idealized embodiments. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region shown or described as flat may generally have rough and/or nonlinear features. Further, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

Fig. 1 is a schematic diagram of a near-eye display device according to an embodiment of the invention. The near-to-eye display device of the present invention is preferably used in close proximity to the eyes of the user. For example, the viewing distance between the near-eye display device and the user's eyes is preferably about several centimeters, but not limited thereto. As shown in fig. 1, the near-eye display device 10 of the present invention includes a display panel 100 and a vibration element 200X. The display panel 100 includes a plurality of pixels 110. The vibration element 200X is disposed at a side of the display panel 100, and the vibration element 200X vibrates to drive the display panel 100 to vibrate, so that the plurality of pixels 110 generate reciprocating displacement, wherein a vibration amplitude of the vibration element 200X is less than 100 μm, so that the plurality of pixels 110 have a displacement distance less than 100 μm. In one embodiment, the vibration amplitude of the vibration element 200X is preferably 50 μm or less, so that the plurality of pixels 110 have a displacement distance of 50 μm or less. In another embodiment, the vibration amplitude of the vibration element 200X is less than 10 μm or less so that the plurality of pixels 110 have a displacement distance of 10 μm or less.

Specifically, the display panel 100 includes a plurality of pixel units (e.g., 101A, 101B, 101C) arranged in an array. Each pixel unit preferably includes a plurality of color pixels that constitute a color image. For example, each pixel unit includes, for example, three pixels of red (R), green (G) and blue (B), but not limited thereto. In other embodiments, each pixel unit may include four pixels of red (R), green (G), blue (B) and white (W), depending on the application. Each pixel 110 has a filter or light emitting layer to provide light of a predetermined color. A light blocking area 120 (e.g., a black matrix resist) is disposed between adjacent pixels 110 to prevent light mixing between adjacent pixels 110. In other words, the adjacent pixels 110 have a pixel pitch (i.e., the width of the light blocking region 120) therebetween to separate the adjacent pixels 110. For example, as shown in fig. 1, three

pixel units

101A, 101B, 101C are arranged along the Y-axis direction, and three pixels 110 of red (R), green (G) and blue (B) of each pixel unit are arranged along the X-axis. The adjacent pixels 110 have a pixel pitch WY therebetween in the Y-axis direction, and the adjacent pixels 110 have a pixel pitch WX therebetween in the X-axis direction. It should be noted that the number of pixel units, the number of pixels of each pixel unit, and the arrangement thereof may vary according to practical applications, and are not limited to the embodiments shown.

The vibration element 200X is preferably a vibrator driven by an electrical signal, such as an electromagnetic vibrator or a piezoelectric vibrator, but not limited thereto. In one embodiment, the vibrating element 200X is preferably any convenient vibrator having a vibration amplitude of 100 μm or less and a vibration frequency of 60Hz or more. In another embodiment, the vibration element 200X is preferably any convenient vibrator having a vibration amplitude of less than 50 μm, or even less than 10 μm, and a vibration frequency of greater than 120Hz. The vibration element 200X is preferably disposed at a side of the display panel 100. For example, the vibrating element 200X may be disposed in the middle of the side edge or at the corner of the display panel 100. In other words, the vibration element 200X is preferably disposed at a peripheral position of the display panel 100. Furthermore, the vibration element 200X may be connected to the display panel 100 through any suitable mechanism to drive the display panel 100 to vibrate. For example, the vibration element 200X may be connected to the display panel 100 by a clamp, an adhesive, a lock, or the like, so that the vibration element 200X may drive the display panel 100 to vibrate when vibrating. As shown in fig. 1, in this embodiment, at least one vibration element 200X is disposed on a side of the display panel 100 parallel to the Y-axis direction to drive the display panel 100 to vibrate along the X-axis direction, but not limited thereto. According to the size of the display panel 100 and the vibration elements 200X used, a plurality of vibration elements 200X may be disposed in pairs on opposite sides of the display panel 100 to drive the display panel 100 to vibrate back and forth towards the opposite sides. Furthermore, the vibration amplitude of the vibration element 200X is preferably determined according to the actual application, for example, according to the pixel pitch, which is described in detail later.

The operation of the near-eye display device of the present invention is described with reference to fig. 2, wherein fig. 2 is a schematic diagram illustrating the operation of the near-eye display device according to an embodiment of the present invention. As shown in fig. 2, two vibration elements 200X are disposed on opposite sides of the display panel 100 in the X-axis direction. When the vibration element 200X vibrates along the X-axis direction, the display panel 100 is driven to vibrate along the X-axis direction, so that the pixels 110 are reciprocally displaced along the X-axis direction. In one embodiment, the displacement distance DX of the pixels 110 is preferably less than or equal to the pixel pitch WX (i.e., DX ≦ WX) to reduce the possibility of light mixing among the pixels 110. Moreover, in another embodiment, the displacement distance DX of the pixels 110 is preferably equal to or greater than 1/2 of the pixel pitch WX (i.e., 1/2WX ≦ DX), such that the pixels 110 are displaced to effectively cover the original position of the light blocking area 120. For example, for a display panel with a resolution of 386 to 615ppi (pixel pitch), the pixel pitch (pixel pitch) is about 40 to 60 μm, and the image refresh rate is about 60 to 120Hz. The pixel pitch ranges from about 4 to 56 μm, calculated as an aperture ratio of 10% to 90%. Therefore, the vibrating element 200X preferably drives the display panel 100 to vibrate at a frequency of 60Hz or more, or more preferably 120Hz or more, so that the pixels 110 are reciprocally displaced in the X direction, and the displacement distance is preferably about 4 to 56 μm or less. Therefore, visually, the display range of the pixel 110 in the X-axis direction is expanded substantially to the size of the pixel pitch WX toward the light blocking area 120, thereby reducing the screen effect of the image in the X-axis direction.

Fig. 3 is a schematic diagram of a near-eye display device according to another embodiment of the invention. As shown in fig. 3, the near-eye display device of the present invention further includes another vibrating element 200Y. The vibration element 200Y is disposed at the other side of the display panel 100 relative to the vibration element 200X, such that the vibration element 200X vibrates along a first direction (e.g., X-axis direction), and the vibration element 200Y vibrates along a second direction (e.g., Y-axis direction), wherein the second direction intersects the first direction. Specifically, the vibration element 200Y is preferably disposed adjacent to the display panel 100 relative to the vibration element 200X, for example, disposed on a side of the display panel 100 parallel to the X-axis direction, so as to drive the display panel 100 to vibrate along the Y-axis direction, such that the vibration directions of the

vibration elements

200Y and 200X are substantially orthogonal (i.e., the first direction is perpendicular to the second direction), so as to enable the plurality of pixels 110 of the display panel 100 to have a two-dimensional displacement effect. The

vibration elements

200Y and 200X may be the same or different vibration elements, and the number of the

vibration elements

200Y and 200X is not limited to the embodiment shown. It should be noted that, for details of the vibration element 200Y, reference may be made to the related description of the vibration element 200X, and the description thereof is omitted here.

The operation of the near-eye display device of the present invention is described with reference to fig. 4A, wherein fig. 4A is a schematic diagram illustrating the operation of the near-eye display device according to another embodiment of the present invention. As shown in fig. 4A, two vibration elements 200X are disposed on two opposite sides of the display panel 100 along the X-axis direction, and two other vibration elements 200Y are disposed on two opposite sides of the display panel 100 along the Y-axis direction. When the vibration element 200X vibrates along the X-axis direction, the display panel 100 is driven to vibrate along the X-axis direction, so that the pixels 110 are reciprocally displaced along the X-axis direction. When the vibration element 200Y vibrates along the Y-axis direction, the display panel 100 is driven to vibrate along the Y-axis direction, so that the pixels 110 are reciprocally displaced along the Y-axis direction. In this embodiment, the

vibration elements

200X and 200Y preferably vibrate alternately, so that the plurality of pixels 110 are displaced alternately in a first direction (e.g., X-axis direction) and a second direction (e.g., Y-axis direction). For example, in the first timing sequence, the vibration element 200X is preferably driven by an electrical signal to vibrate along the X-axis direction and the vibration element 200Y is not driven to drive the display panel 100 to vibrate along the X-axis direction, so that the plurality of pixels 110 are displaced along the X-axis direction, and the displacement distance DX is preferably less than or equal to the pixel pitch WX and equal to or greater than 1/2 of the pixel pitch WX (i.e., 1/2WX ≦ DX ≦ WX); in the second timing sequence, the vibration element 200Y is preferably driven by an electrical signal to vibrate along the Y-axis direction and the vibration element 200X is not driven to drive the display panel 100 to vibrate along the Y-axis direction, such that the plurality of pixels 110 are displaced along the Y-axis direction, and the displacement distance DY is preferably less than or equal to the pixel pitch WY and equal to or greater than 1/2 of the pixel pitch WY (i.e., 1/2WY is less than or equal to DY and less than or equal to WY). The

vibration elements

200X and 200Y may have the same or different vibration frequencies, and the vibration frequency is preferably 60Hz or more, and more preferably 120Hz or more. This corresponds to the pixel 110 having a display range in the X-axis direction extending toward the pixel pitch WX and a display range in the Y-axis direction extending toward the pixel pitch WY, thereby reducing the screen effect in the X-axis direction and the Y-axis direction. As shown in fig. 4B, since the pixels 110 vibrate in the X-axis direction and the Y-axis direction alternately, when the user views the image 105, the pixels 110 vibrate in the X-Y plane at the same time, thereby effectively reducing the screen effect of the image in the two-dimensional direction.

Fig. 5 is a schematic diagram of a near-eye display device according to another embodiment of the invention. As shown in fig. 5, the near-eye display device of the present invention may further comprise a control element 300, wherein the control element 300 controls the vibration of the vibration element (e.g. 200X and/or 200Y). The control element 300 may be a driver electrically connected to the vibration element (200X and/or 200Y) to provide a driving signal to the vibration element (200X and/or 200Y) so as to control the vibration amplitude or the vibration frequency of the vibration element (200X and/or 200Y). In one embodiment, the control device 300 may be integrated with other electrical components of the near-eye display device (e.g., a circuit board) or may be separate.

Furthermore, the near-eye display device of the present invention may further comprise a lens 400, wherein the lens 400 is disposed between the display panel 100 and the user 20. The lens 400 is used for magnifying the image formed by the display panel 100 and refracting the magnified image toward the eyes of the user. The lens 400 can be used to increase the viewing angle for the user to see and to adjust the focal length. Thus, the user can have an effect of viewing an image larger than an image actually displayed on the display panel 100.

In addition, the near-eye display device of the present invention may further include a housing 500, wherein the housing 500 provides an accommodating space 510 for accommodating elements of the near-eye display device, such as the display panel 100, the

vibration elements

200X and 200Y, the control element 300, the lens 400, and the like. Housing 500 may have various convenient forms depending on the application. For example, the housing 500 may have a form wearable by a user, such as a frame form or a helmet form, so that the near-eye display device may be fixed to the head of the user, but not limited thereto. In other embodiments, the housing 500 may have other forms such that a user may hold the near-eye display device near the eyes. In addition, the housing 500 may be designed with a fixing mechanism to position the display panel 100 and the

vibration elements

200X and 200Y relative to each other, so that the

vibration elements

200X and 200Y drive the display panel 100 to vibrate. Furthermore, the housing 500 may also be provided with a shock absorbing element, such as shock absorbing cotton, to reduce the vibration effect of the shock absorbing element on the whole near-eye display device, so that when the display panel is driven by the shock absorbing element to vibrate to reduce the screen effect, the user can not feel that the near-eye display device is vibrating.

It should be noted that the near-eye display device of the present invention is preferably applied to virtual reality display, and may include one display panel or two display panels according to actual applications. When two display panels are used, each display panel preferably has a corresponding vibrating element, but not limited thereto. Furthermore, the near-to-eye display device of the present invention is described by taking the vibration element as an example along the X-axis or Y-axis direction, but in other embodiments, the vibration element may be disposed at a corner of the display panel to drive the display panel to vibrate obliquely, so that an included angle smaller than 90 degrees is formed between the vibration direction and the X-axis or Y-axis direction.

The near-to-eye display device drives the display panel to vibrate through the vibration element, so that the pixels are subjected to reciprocating displacement to generate a micro-amplitude vibration effect; in particular, the near-eye display device of the present invention controls the vibration amplitude of the vibration element such that the displacement of the pixel generates the effect of blooming the light blocking region between the filled pixels without affecting the quality of the adjacent pixels (e.g., without color shift due to light mixing). Moreover, the near-eye display device of the invention has the image vibration generated by the vibration of the vibration element with the simple harmonic motion similar to high frequency, when being applied to virtual reality display, the visual perception is approximately the same as that of a vestibular system, and the visual perception does not generate the motion sickness of virtual reality during the viewing.

The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. A near-eye display device, comprising:

the display panel comprises a plurality of pixels, and a pixel interval is formed between every two adjacent pixels;

the vibration element is arranged on the side edge of the display panel and vibrates to drive the display panel to vibrate, so that the plurality of pixels are displaced, wherein the displacement distance of the plurality of pixels is less than or equal to the pixel interval; and

another vibration element arranged at the other side of the display panel opposite to the vibration element, the vibration element vibrating along a first direction, the other vibration element vibrating along a second direction, the second direction intersecting the first direction,

wherein the vibrating element and the other vibrating element vibrate alternately, so that the plurality of pixels are displaced back and forth alternately in the first direction and the second direction.

2. The near-eye display device of claim 1, wherein the displacement distance is equal to or greater than 1/2 of the pixel pitch.

3. The near-eye display device of claim 1, wherein the vibration frequency of the vibrating element is above 60 Hz.

4. The near-to-eye display device of claim 3, wherein the vibration frequency of the vibrating element is above 120Hz.

5. The near-to-eye display device of claim 1, further comprising a control element, wherein the control element controls the vibration of the vibration element.

6. The near-eye display device of claim 1, wherein the vibrating element and the another vibrating element have the same or different vibration frequencies.

7. The near-eye display device of claim 1, further comprising a lens, wherein the lens is disposed between the display panel and a user.