TWI811416B - Near-eye display device - Google Patents

Abstract

A near-eye display device includes a display panel including a plurality of pixels, and a vibration generator disposed on a side of the display panel, wherein the vibration generator vibrates to drive the display panel to vibrate, causing the pixels to reciprocatively shift, and wherein a vibration amplitude is less than 100 μm.

Description

near eye display device

The present invention relates to a near-eye display device, in particular to a near-eye display device that reduces the screen door effect.

Display devices generally evaluate display clarity based on whether pixels can be visually seen. When the pixel density is insufficient, you will visually see dividing lines between pixels, just like looking at things behind a screen window, which is called the "screen-door effect". Generally speaking, when the viewing distance between the display device and the user is larger, the number of pixels that the user can see at a fixed viewing angle is greater, making the screen door effect less distinct. However, in applications such as near-eye display devices such as virtual reality, the display device is placed almost close to the user's eyes, so that the viewing distance is only a few centimeters, resulting in the number of pixels that can be seen at a fixed viewing angle. Significantly reduced, highlighting the problem of "screen door effect".

A conventional technique for improving the screen door effect is to form smaller pixels to increase the number of pixels per unit area. However, smaller pixels must be equipped with higher-precision process technology, such as high-precision lithography process, which makes the process more difficult, the yield is difficult to control, and the equipment requirements are relatively high, and the manufacturing cost has also increased rapidly. increase.

One object of the present invention is to provide a near-eye display device that uses vibration to improve the screen door effect to improve the display quality of existing display panels.

In one embodiment, the present invention provides a near-eye display device, which includes a display panel and a vibration element, wherein the display panel includes a plurality of pixels; the vibration element is disposed on the side of the display panel, and the vibration element vibrates to drive the display panel to vibrate, causing the plurality of pixels to vibrate. The pixel undergoes reciprocating displacement, and the vibration amplitude of the vibrating element is less than 100 μm.

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

In another embodiment, the present invention provides a near-eye display device, which includes a display panel and a vibration element, wherein the display panel includes a plurality of pixels, and there is a pixel spacing between adjacent pixels; the vibration element is disposed on the side of the display panel, The vibration component vibrates to drive the display panel to vibrate, causing the plurality of pixels to be displaced, where the displacement distance of the plurality of pixels is less than or equal to the pixel pitch.

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

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

In one embodiment, the near-eye display device of the present invention further includes another vibration element, wherein the other vibration element is disposed on the other side of the display panel relative to the vibration element, the vibration element vibrates along the first direction, and the other vibration element vibrates along the first direction. Vibrate in two directions, and the second direction intersects with the first direction.

In one embodiment, the vibrating element and another vibrating element alternately vibrate, causing the plurality of pixels to alternately displace 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 of the present invention further includes a lens, wherein the lens is disposed between the display panel and the user.

Compared with the conventional technology, the near-eye display device of the present invention uses a vibration element to perform micro-vibration, so that the pixels of the image are correspondingly displaced, thereby producing a pixel blurring effect, thereby reducing the segmentation phenomenon between image pixels and improving the existing The display quality of the display panel.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Throughout this specification, the same reference numbers refer to the same elements. 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 Intermediate 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 a physical and/or electrical connection. Furthermore, “electrical connection” or “coupling” may mean the presence of other components between the two components.

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 or parts thereof shall 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 "section" discussed below could be termed a second element, component, region, layer or section 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 dictates 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 also be understood that when used in this specification, the terms "comprises" and/or "includes" designate the presence of stated features, regions, integers, steps, operations, elements and/or components but do not exclude one or more The presence or addition of other features, regions, steps, operations, elements, parts and/or combinations thereof.

Additionally, 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 in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation illustrated 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 the "upper" side of the other elements. Thus, the exemplary term "lower" may include both "lower" and "upper" orientations, depending on the particular orientation of the drawing. 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 "lower" may include both upper and lower orientations.

As used herein, "about," "approximately," or "substantially" includes the stated value and an average within an acceptable range of deviations from the particular value as determined by one of ordinary skill in the art, taking into account the measurements in question and the A specific amount of error associated with a 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%. Furthermore, the terms "about", "approximately" or "substantially" used in this article can be used to select a more acceptable deviation range or standard deviation based on optical properties, etching properties or other properties, and one standard deviation may not apply to all properties. .

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 invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be construed to have meanings consistent with their meanings in the context of the relevant technology and the present invention, and are not to be construed as idealistic or excessive Formal meaning, unless expressly defined as such herein.

Example embodiments are described herein with reference to cross-sectional illustrations that are schematic illustrations of idealized embodiments. Accordingly, variations in the shape of the illustrations, for example as a result of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, regions shown or described as flat may typically have rough and/or non-linear characteristics. Additionally, the acute angles shown may be rounded. Accordingly, the regions shown in the figures are schematic in nature and their shapes are not intended to show the precise shapes of the regions 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 present invention. The near-eye display device of the present invention is preferably used close to the user's eyes. For example, the viewing distance between the near-eye display device and the user's eyes is preferably about a few centimeters, but is not limited to this. 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 on the side of the display panel 100, and the vibration element 200X vibrates to drive the display panel 100 to vibrate, causing the plurality of pixels 110 to undergo reciprocating displacement. The vibration amplitude of the vibration element 200X is less than 100 μm, so that the plurality of pixels 110 have Displacement distance below 100μm. In one embodiment, the vibration amplitude of the vibration element 200X is preferably less than 50 μm, so that the plurality of pixels 110 have a displacement distance of less than 50 μm. In another embodiment, the vibration amplitude of the vibration element 200X is less than 10 μm, so that the plural pixels 110 have a displacement distance of less than 10 μm.

Specifically, the display panel 100 includes a plurality of pixel units (eg, 101A, 101B, 101C) arranged in an array. Each pixel unit preferably includes multi-color pixels that can form a color image. For example, each pixel unit includes three pixels, such as red (R), green (G) and blue (B), but is not limited to this. Depending on the actual application, in other embodiments, each pixel unit may include four pixels: red (R), green (G), blue (B), and white (W). Each pixel 110 has a filter or light-emitting layer to provide a predetermined color of light. The light-blocking area 120 (eg, black matrix resist) is disposed between adjacent pixels 110 to avoid light mixing between adjacent pixels 110 . In other words, there is a pixel pitch (ie, the width of the light blocking area 120) between adjacent pixels 110 to separate the adjacent pixels 110. For example, as shown in FIG. 1 , three pixel units 101A, 101B, and 101C are arranged along the Y-axis direction, and the three pixel units of red (R), green (G), and blue (B) are Pixel 110 is arranged along the X-axis. In the Y-axis direction, there is a pixel pitch WY between adjacent pixels 110, and in the X-axis direction, there is a pixel pitch WX between adjacent pixels 110. It should be noted here that the number of pixel units, the number of pixels in each pixel unit, and their arrangement may be changed according to actual applications and are not limited to those shown in the embodiments.

The vibration element 200X is preferably a vibrator that can be driven by an electrical signal, such as an electromagnetic vibrator or a piezoelectric vibrator, but is not limited thereto. In one embodiment, the vibration element 200X is preferably any suitable vibrator with a vibration amplitude below 100 μm and a vibration frequency above 60 Hz. In another embodiment, the vibration element 200X is preferably any suitable vibrator with a vibration amplitude below 50 μm, or even below 10 μm, and a vibration frequency above 120 Hz. The vibration element 200X is preferably disposed on the side of the display panel 100 . For example, the vibration element 200X can be disposed in the middle or corner of the side 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 can 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 can be connected to the display panel 100 through clamping, adhesion, locking, etc., so that when the vibration element 200X vibrates, it can drive the display panel 100 to vibrate. As shown in FIG. 1 , in this embodiment, at least one vibration element 200X is disposed on the 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 is not limited to this. Depending on the size of the display panel 100 and the vibration elements 200X used, a plurality of vibration elements 200X can be arranged in pairs on opposite sides of the display panel 100 to drive the display panel 100 to vibrate reciprocally toward the opposite sides. Furthermore, the vibration amplitude of the vibration element 200X is preferably determined based on the actual application, for example, based on the pixel pitch, which will be described in detail later.

The operation of the near-eye display device of the present invention will be described with reference to FIG. 2 , which is a schematic diagram of 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 along 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, causing the plurality of pixels 110 to undergo reciprocating displacement along the X-axis direction. In one embodiment, the displacement distance DX of the plurality of pixels 110 is preferably less than or equal to the pixel pitch WX (that is, DX≦WX) to reduce the possibility of light mixing between the pixels 110 . Furthermore, in another embodiment, the displacement distance DX of the plurality of pixels 110 is preferably equal to or greater than 1/2 of the pixel pitch WX (i.e., 1/2WX≦DX), so that the displacement of the plurality of pixels 110 can effectively cover the light blocking The original location of area 120. For example, for a display panel with a resolution of 386-615 ppi (pixels per inch), the pixel pitch (pixel pitch) is about 40-60 μm, and the image update rate is about 60-120Hz. Calculated based on an aperture ratio of 10%-90%, the pixel pitch range is approximately 4-56μm. Therefore, the vibration element 200X can preferably drive the display panel 100 to vibrate at a frequency of above 60 Hz or preferably above 120 Hz, so that the pixel 110 is reciprocally displaced in the X direction, and the displacement distance is preferably about 4-56 μm or less. This is visually equivalent to extending the display range of the pixel 110 in the X-axis direction toward the light-blocking area 120 by approximately the size of the pixel pitch WX, thereby reducing the screen door 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 present invention. As shown in FIG. 3 , the near-eye display device of the present invention further includes another vibration element 200Y. The vibration element 200Y is disposed on the other side of the display panel 100 relative to the vibration element 200X, so that the vibration element 200X vibrates along the first direction (for example, the X-axis direction), and the vibration element 200Y vibrates along the second direction (for example, the Y-axis direction), And the second direction intersects the first direction. Specifically, the vibration element 200Y is preferably arranged on the adjacent side of the display panel 100 relative to the vibration element 200X, for example, on the 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, so that The vibration directions of the vibration elements 200Y and 200X are substantially orthogonal (that is, the first direction is perpendicular to the second direction), so that the plurality of pixels 110 of the display panel 100 have a two-dimensional displacement effect. The vibration elements 200Y and 200X can be the same or different vibration elements, and the number of the vibration elements 200Y and 200X is not limited to that shown in the embodiment. It should be noted here that for details of the vibration element 200Y, reference can be made to the related description of the vibration element 200X mentioned above and will not be described again here.

The operation of the near-eye display device of the present invention will be described with reference to FIG. 4A , which is a schematic diagram of 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 arranged on opposite sides of the display panel 100 along the X-axis direction, and two other vibration elements 200Y are arranged on 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, causing the plurality of pixels 110 to undergo reciprocating displacement 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, causing the plurality of pixels 110 to undergo reciprocating displacement along the Y-axis direction. In this embodiment, the vibrating element 200X and the vibrating element 200Y preferably alternately vibrate, so that the plurality of pixels 110 are alternately displaced in the first direction (eg, the X-axis direction) and the second direction (eg, the Y-axis direction). For example, a vibration cycle preferably includes two timing sequences. In the first timing sequence, an electrical signal is preferably used to drive the vibration element 200X to vibrate along the X-axis direction without driving the vibration element 200Y, so as to drive the display panel 100 along the X-axis direction. The vibration in the X-axis direction causes the plurality of pixels 110 to be displaced along the X-axis direction, and the displacement distance DX is preferably less than or equal to the pixel spacing WX and equal to or greater than 1/2 of the pixel spacing WX (i.e. 1/2WX≦DX≦WX ); In the second sequence, it is preferable to use an electrical signal to drive the vibration element 200Y to vibrate along the Y-axis direction without driving the vibration element 200X, so as to drive the display panel 100 to vibrate along the Y-axis direction, so 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 spacing WY and equal to or greater than 1/2 of the pixel spacing WY (that is, 1/2WY≦DY≦WY). The vibration element 200X and the vibration element 200Y can have the same or different vibration frequencies, and the vibration frequency is preferably above 60 Hz, and more preferably above 120 Hz. This is equivalent to making the display range of the pixel 110 in the X-axis direction expand toward the pixel pitch WX and the display range in the Y-axis direction toward the pixel pitch WY, thereby reducing the image quality in the X-axis direction and the Y-axis direction. The screen door effect. As shown in Figure 4B, since the pixel 110 vibrates rapidly and alternately in the X-axis direction and the Y-axis direction, when the user views the image 105, it will produce the effect of the pixel 110 vibrating toward the X-Y axis plane at the same time, effectively reducing the two-dimensional distortion of the image. screen door effect.

FIG. 5 is a schematic diagram of a near-eye display device according to another embodiment of the present invention. As shown in FIG. 5 , the near-eye display device of the present invention may further include a control element 300 , where the control element 300 controls the vibration of the vibration element (such as 200X and/or 200Y). The control element 300 can 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), thereby controlling the vibration amplitude or vibration of the vibration element (200X and/or 200Y). frequency. In one embodiment, the control component 300 may be integrated with other electrical components (such as a circuit board) of the near-eye display device or may be provided independently.

Furthermore, the near-eye display device of the present invention may further include a lens 400 , wherein the lens 400 is disposed between the display panel 100 and the user 20 . The lens 400 is used to magnify the image formed by the display panel 100 and refract the magnified image toward the user's eyes. The lens 400 can be used to increase the viewing angle that the user can view and to adjust the focal length. Thereby, the user can have the effect of viewing an image that is larger than the image actually displayed by 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 accommodation space 510 for accommodating components of the near-eye display device, such as the display panel 100, vibration components 200X, 200Y, control components 300, Lens 400 etc. Depending on the actual application, the housing 500 may have various suitable forms. For example, the housing 500 may be in a form that is wearable by the user, such as a frame or a helmet, so that the near-eye display device can be fixed on the user's head, but is not limited thereto. In other embodiments, the housing 500 may have other forms so that the user can hold the near-eye display device close to the eyes. In addition, the housing 500 can be designed with a fixing mechanism to position the relative positions of the display panel 100 and the vibration components 200X and 200Y, so that the vibration components 200X and 200Y drive the display panel 100 to vibrate. Furthermore, the casing 500 can also be provided with shock-absorbing elements, such as shock-absorbing cotton, to reduce the vibration impact of the vibration elements on the entire near-eye display device, so that when the vibration elements drive the display panel to vibrate to reduce the screen door effect, the user can actually You cannot feel the vibration of the display device close to your eyes.

It should be noted here that the near-eye display device of the present invention is preferably used for virtual reality display, and may include one display panel or two display panels depending on the actual application. When two display panels are used, each display panel preferably has a corresponding vibration element, but is not limited to this. Furthermore, the near-eye display device of the present invention takes the vibrating element along the X-axis or Y-axis direction as an example. However, in other embodiments, the vibrating element can be disposed at the corner of the display panel to drive the display panel to vibrate obliquely, causing the vibration to occur. The angle between the direction and the X-axis or Y-axis direction is less than 90 degrees.

The near-eye display device of the present invention uses the vibration element to drive the display panel to vibrate, so that the reciprocating displacement of the pixels produces a slight vibration effect; in particular, the near-eye display device of the present invention controls the vibration amplitude of the vibration element to cause the displacement of the pixels to occur Blur the effect of filling the light-blocking area between pixels without affecting the quality of adjacent pixels (for example, without mixing light to produce color casts). Furthermore, the image vibration generated by the vibration of the vibrating element of the near-eye display device of the present invention has similar high-frequency simple harmonic motion. When applied to virtual reality display, the visual experience is roughly the same as that of the vestibular system, and virtual vibration will not occur during viewing. Reality motion sickness.

The present invention has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples of implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalent arrangements included in the spirit and scope of the claimed patent are included in the scope of the present invention.

10: Near-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 components 400:Lens 500: Shell 510: Accommodation space DX, DY: displacement distance WX, WY: pixel spacing

FIG. 1 is a schematic diagram of a near-eye display device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the 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 a schematic diagram of the operation of a near-eye display device according to another embodiment of the present invention. FIG. 4B is a schematic diagram of the 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 present invention.

10: Near-eye display device

100:Display panel

110: Pixel

101A, 101B, 101C: Pixel unit

120:Light blocking area

200X: Vibration element

DX: displacement distance

WX, WY: pixel spacing

Claims (6)

A near-eye display device, including: a display panel including a plurality of pixels, adjacent sides of adjacent pixels having a pixel spacing, and the pixel spacing is smaller than the width of the pixel; a vibration element, Disposed on the side of the display panel, the vibration element 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 pitch; and another vibration element, relatively When the vibration element is disposed on the other side of the display panel, the vibration element vibrates along a first direction, the other vibration element vibrates along a second direction, and the second direction intersects the first direction, wherein the The vibration element and the other vibration element vibrate alternately, so that the plurality of pixels are displaced alternately in the first direction and the second direction, and the vibration element and the other vibration element have the same or different vibration frequencies. The near-eye display device as claimed in claim 1, wherein the displacement distance is equal to or greater than 1/2 of the pixel pitch. The near-eye display device according to claim 1, wherein the vibration frequency of the vibration element is above 60 Hz. The near-eye display device as claimed in claim 3, wherein the vibration frequency of the vibration element is above 120 Hz. The near-eye display device as claimed in claim 1 further includes a control element, wherein the control element controls the vibration of the vibration element. The near-eye display device of claim 1 further includes a lens, wherein the lens is disposed between the display panel and a user.

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