TW202549622A - Scan needle and scan display system including same - Google Patents

Abstract

A scan needle includes a substrate, a first color light emitting pixel array comprising a plurality of first color light emitting pixels formed on the substrate, a second color light emitting pixel array comprising a plurality of second color light emitting pixels formed on the substrate, and a third color light emitting pixel array comprising a plurality of third color light emitting pixels formed on the substrate. The first color light emitting pixel array is parallel to the second color light emitting pixel array, and the second color light emitting pixel array is parallel to the third color light emitting pixel array.

Description

Scanning needle and scanning display system including the thereof

Cross-referencing of related applications This application claims the benefits of U.S. Patent Application No. 16/985,343, filed August 5, 2020; U.S. Patent Application No. 16/985,341, filed August 5, 2020; U.S. Patent Application No. 16/985,354, filed August 5, 2020; U.S. Patent Application No. 16/985,368, filed August 5, 2020; U.S. Patent Application No. 16/985,372, filed August 5, 2020; and U.S. Patent Application No. 16/985,382, filed August 5, 2020. The full text of the above-mentioned referenced applications is incorporated herein by reference. Field of Invention

This invention relates generally to display systems, and more particularly to display systems including scanning needles and display methods of display systems.

Background of the Invention A light emitting diode (LED) is a semiconductor diode that can convert electrical energy into light energy, and emits different colors of light depending on the material of the light-emitting layer included in the LED.

Habitual LED display panels are formed by assembling multiple LEDs on a substrate. To display images within the display area of a habitual LED display panel, multiple LEDs need to be formed throughout the entire display area, which may require complex manufacturing processes and high manufacturing costs. Furthermore, because habitual LED displays include a large number of LEDs, they have high power consumption.

Summary of the Invention According to one embodiment of the present invention, a scanning needle is provided. The scanning needle includes a substrate, a first color emitting pixel array including a plurality of first color emitting pixels formed on the substrate, a second color emitting pixel array including a plurality of second color emitting pixels formed on the substrate, and a third color emitting pixel array including a plurality of third color emitting pixels formed on the substrate. The first color emitting pixel array is parallel to the second color emitting pixel array, and the second color emitting pixel array is parallel to the third color emitting pixel array.

Detailed Explanation Reference will now be made to this embodiment in detail, examples of which will be illustrated in the accompanying drawings. Where possible, the same reference numerals will be used throughout the drawings to denote the same or similar parts.

According to an embodiment of the present invention, the scanning needle includes a plurality of light-emitting pixels for emitting light representing each of a plurality of image portions. The light emitted from the scanning needle is moved relative to the screen at a predetermined frequency to continuously project image portions onto the screen. As a result, an image formed by the image portions is displayed on the screen.

Figure 1 is a top view of a scanning needle 100 according to an embodiment of the present invention. Referring to Figure 1, the scanning needle 100 includes a substrate 102, a first color emitting pixel array 110 including a plurality of first color emitting pixels 112 formed on the substrate 102, a second color emitting pixel array 120 including a plurality of second color emitting pixels 122 formed on the substrate 102, and a third color emitting pixel array 130 including a plurality of third color emitting pixels 132 formed on the substrate 102. The first color emitting pixel array 110 is parallel to the second color emitting pixel array 120, and the second color emitting pixel array 120 is parallel to the third color emitting pixel array 130.

The X-axis direction shown in the figure is defined as the horizontal direction. The Y-axis direction, which is perpendicular to the X-axis direction, is defined as the vertical direction. The Z-axis direction is perpendicular to both the X-axis and Y-axis directions. In this invention, "horizontal direction" and "vertical direction" are used for convenience of interpretation and are not intended to limit the specific orientation of any component described herein.

In the embodiment shown in FIG1, each of the first color luminescent pixel array 110, the second color luminescent pixel array 120, and the third color luminescent pixel array 130 includes pixels 112, 122, or 132 formed in a single column extending in the horizontal direction (X-axis direction). The first color luminescent pixel array 110, the second color luminescent pixel array 120, and the third color luminescent pixel array 130 are arranged sequentially in the vertical direction (Y-axis direction).

The first color emitting pixel 112 in the first color emitting pixel array 110 emits light of the first color. The second color emitting pixel 122 in the second color emitting pixel array 120 emits light of the second color. The third color emitting pixel 132 in the third color emitting pixel array 130 emits light of the third color. The first color, the second color, and the third color are different from each other.

In the embodiment shown in FIG1, the scanning needle 100 further includes a light-isolating wall 150 formed on the substrate 102. The light-isolating wall 150 is disposed between the first color emitting pixel array 110 and the second color emitting pixel array 120, and between the second color emitting pixel array 120 and the third color emitting pixel array 130. The light-isolating wall 150 may be formed of any non-transparent material, such as a non-transparent metal, to isolate light emitted from the first color emitting pixel array 110, the second color emitting pixel array 120, and the third color emitting pixel array 130.

The first color can be any color selected from red, green, blue, yellow, orange, and cyan, and is different from the second and third colors. The second color can be any color selected from green, blue, red, yellow, orange, and cyan, and is different from the first and third colors. The third color can be any color selected from blue, red, green, yellow, orange, and cyan, and is different from the first and second colors. In one embodiment, each of the first color emitting pixels 112 includes a red emitting pixel, each of the second color emitting pixels 122 includes a blue emitting pixel, and each of the third color emitting pixels 132 includes a green emitting pixel.

In some embodiments of the present invention, the first pitch p1 (i.e., the distance between the centers of two adjacent first color luminescent pixels 112) of the first color luminescent pixel array 110 is less than 5 µm. The second pitch p2 (i.e., the distance between the centers of two adjacent second color luminescent pixels 122) of the second color luminescent pixel array 120 is less than 5 µm. The third pitch (i.e., the distance between the centers of two adjacent third color luminescent pixels 132) of the third color luminescent pixel array 130 is less than 5 µm. The first spacing s1 between the first color luminescent pixel array 110 and the second color luminescent pixel array 120 is less than 100 µm. The second spacing s2 between the second color luminescent pixel array 120 and the third color luminescent pixel array 130 is less than 100 µm.

In some embodiments of the present invention, the first color emitting pixels 112 in the first color emitting pixel array 110 are formed to have the same size and the same structure. The second color emitting pixels 122 in the second color emitting pixel array 120 are formed to have the same size and the same structure. The third color emitting pixels 132 in the third color emitting pixel array 130 are formed to have the same size and the same structure.

In the embodiment shown in FIG1, the scanning needle 100 includes all of the first color luminescent pixel array 110, the second color luminescent pixel array 120, and the third color luminescent pixel array 130. However, the present invention is not limited thereto. In alternative embodiments of the present invention (not shown), the scanning needle 100 may include only one of the first color luminescent pixel array 110, the second color luminescent pixel array 120, or the third color luminescent pixel array 130 formed on the substrate 102. Still in some alternative embodiments of the present invention (not shown), the scanning needle 100 may include only two of the first color luminescent pixel array 110, the second color luminescent pixel array 120, and the third color luminescent pixel array 130.

In the embodiment shown in FIG1, the number of first color luminescent pixels 112 in the first color luminescent pixel array 110 is the same as the number of second color luminescent pixels 122 in the second color luminescent pixel array 120. Furthermore, the number of second color luminescent pixels 122 in the second color luminescent pixel array 120 is the same as the number of third color luminescent pixels 132 in the third color luminescent pixel array 130.

In the embodiment shown in FIG1, one of the first color luminescent pixel array 110, the second color luminescent pixel array 120, and the third color luminescent pixel array 130 includes pixels 112, 122, or 132 formed in a single column extending in a horizontal direction. However, the invention is not limited thereto. In some embodiments explained in further detail below, at least one of the first color luminescent pixel array 110, the second color luminescent pixel array 120, and the third color luminescent pixel array 130 may include pixels formed in a two-dimensional array comprising at least two rows and two columns.

Figure 2A is an enlarged top view of region A of the scanning needle 100 according to an embodiment of the present invention. Referring to Figure 2A, region A of the scanning needle 100 includes a first color luminescent pixel 112_1, a second color luminescent pixel 122_1, and a third color luminescent pixel 132_1. Each of the first color luminescent pixel 112_1, the second color luminescent pixel 122_1, and the third color luminescent pixel 132_1 is generally circular in the top view. The shape of a single luminescent pixel is not limited to this. That is, the shape of a single luminescent pixel can be circular, square, rectangular, etc.

The size of a single luminescent pixel ranges from 0.5 µm to 50 µm. In one embodiment, the diameters of the first color luminescent pixel 112_1, the second color luminescent pixel 122_1, and the third color luminescent pixel 132_1 are substantially the same, for example, from 0.5 µm to 50 µm. However, the size of the three luminescent pixels is not limited to this. That is, the sizes of the three luminescent pixels 112_2, 122_2, and 132_2 may be the same as each other or may be different from each other.

Figure 2B is an enlarged top view of region A of the scanning needle 100 according to another embodiment of the present invention. Referring to Figure 2B, region A of the scanning needle 100 includes a first color luminescent pixel 112_2, a second color luminescent pixel 122_2, and a third color luminescent pixel 132_2. Each of the first color luminescent pixel 112_2, the second color luminescent pixel 122_2, and the third color luminescent pixel 132_2 is generally rectangular in the top view. The dimensions of the first color luminescent pixel 112_2, the second color luminescent pixel 122_2, and the third color luminescent pixel 132_2 are substantially the same in the horizontal (X-axis) direction, for example, from 0.5 µm to 50 µm. The dimension of the first color luminescent pixel 112_2 in the vertical (Y-axis) direction is, for example, from 0.5 µm to 50 µm. The size of the second color luminescent pixel 122_2 in the vertical direction is, for example, 0.5 µm to 50 µm. The size of the third color luminescent pixel 132_2 in the vertical direction is, for example, 0.5 µm to 50 µm.

In one embodiment, the area of the first color luminescent pixel 112_2 is larger than the area of the second color luminescent pixel 122_2, and the area of the second color luminescent pixel 122_2 is larger than the area of the third color luminescent pixel 132_2. However, the areas of the three luminescent pixels are not limited thereto. That is, the areas of the three luminescent pixels 112_2, 122_2, and 132_2 may be the same as each other or may be different from each other.

Figure 3A illustrates one configuration of a scanning needle 100 according to an embodiment of the present invention, as shown in the cross-sectional view along section line B-B' of Figure 1. Referring to Figure 3A, the scanning needle 100A includes a first color emitting pixel 112_3A in a first color emitting pixel array 110, a second color emitting pixel 122_3A in a second color emitting pixel array 120, and a third color emitting pixel 132_3A in a third color emitting pixel array 130, all arranged side-by-side on a substrate 102. The first color emitting pixel 112_3A includes a first color emitting diode, and is referred to herein as a first color emitting diode 112_3A. The second color emitting pixel 122_3A includes a second color emitting diode, and is referred to herein as the second color emitting diode 122_3A. The third color emitting pixel 132_3A includes a third color emitting diode, and is referred to herein as the third color emitting diode 132_3A.

Although FIG. 3A illustrates the first color light-emitting diode 112_3A, the second color light-emitting diode 122_3A, and the third color light-emitting diode 132_3A as arranged in the vertical (Y-axis) direction, the invention is not limited thereto. In some alternative embodiments, the first color light-emitting diode 112_3A, the second color light-emitting diode 122_3A, and the third color light-emitting diode 132_3A may be arranged in the horizontal (X-axis) direction.

As shown in Figure 3A, the first color light-emitting diode 112_3A includes at least a first segment 301_1 of a first metal layer and a first segment 302_1 of a first color light-emitting layer (as seen in Figure 3A, in top-down order). The second color light-emitting diode 122_3A includes at least a second segment 301_2 of a first metal layer, a second segment 302_2 of a first color light-emitting layer, a first segment 303_1 of a second metal layer, and a first segment 304_1 of a second color light-emitting layer (as seen in Figure 3A, in top-down order), and at least one first electrical connector 307. The second segment 301_2 of the first metal layer and the first segment 303_1 of the second metal layer are electrically connected to each other by at least one first electrical connector 307. The third color light-emitting diode 132_3A includes at least the third segment 301_3 of the first metal layer, the third segment 302_3 of the first color light-emitting layer, the second segment 303_2 of the second metal layer, the second segment 304_2 of the second color light-emitting layer, the third metal layer 305, and the third color light-emitting layer 306 (as seen in Figure 3A, in bottom-to-top order), and at least one second electrical connector 308. The third segment 301_3 of the first metal layer, the second segment 303_2 of the second metal layer, and the third metal layer 305 are electrically connected to each other by at least one second electrical connector 308.

The scanning probe 100A also includes an insulating layer 310 and a transparent conductive layer 320 covering the first color light-emitting diode 112_3A, the second color light-emitting diode 122_3A, and the third color light-emitting diode 132_3A. The insulating layer 310 has an opening that exposes the first segment 302_1 of the first color light-emitting layer, the first segment 304_1 of the second color light-emitting layer, and the top surface of the third color light-emitting layer 306. The transparent conductive layer 320 covers the insulating layer 310 and is formed in the opening of the insulating layer 310, thereby contacting the first segment 302_1 of the first color luminescent layer, the first segment 304_1 of the second color luminescent layer, and the exposed surface of the third color luminescent layer 306 through the opening.

The scanning probe 100 further includes an optical isolation wall 350 disposed between the first color light-emitting diode 112_3A and the second color light-emitting diode 122_3A, and between the second color light-emitting diode 122_3 and the third color light-emitting diode 132_3. The height of the optical isolation wall 350 may be greater than the tallest of the first color light-emitting diode 112_3, the second color light-emitting diode 122_3, and the third color light-emitting diode 132_3. In the embodiment shown in FIG. 3A, the height of the optical isolation wall 350 is greater than the height of the third color light-emitting diode 132_3.

Furthermore, the scanning needle 100 includes a transparent isolation layer 330 covering the entirety of the first color light-emitting diode 112_3A, the second color light-emitting diode 122_3A, the third color light-emitting diode 132_3A, the insulating layer 310, the transparent conductive layer 320, and the light-isolating wall 350. Additionally, a microlens 360 is formed on each of the first color light-emitting diode 112_3A, the second color light-emitting diode 122_3A, and the third color light-emitting diode 132_3A.

The substrate 102 may be an integrated circuit (IC) substrate, which includes an interconnect layer electrically connected to the first segment 301-1 of the first metal layer in the first color light-emitting diode 112_3, the second segment 301-2 of the first metal layer in the second color light-emitting diode 122_3, and the third segment 301-3 of the first metal layer in the third color light-emitting diode 132_3. Here, the IC substrate includes at least a driving circuit that separately controls each of the first color light-emitting diode 112_3A, the second color light-emitting diode 122_3A, and the third color light-emitting diode 132_3A.

Figure 3B illustrates another configuration of the scanning needle 100 according to another embodiment of the present invention, as shown in the cross-sectional view along section line B-B' of Figure 1. The components of the scanning needle 100B are the same as those of the scanning needle 100A and are identified by the same reference numerals. As shown in Figure 3B, the scanning needle 100B includes a first color light-emitting diode 112_3B in a first color light-emitting pixel array 110, a second color light-emitting diode 122_3B in a second color light-emitting pixel array 120, and a third color light-emitting diode 132_3B in a third color light-emitting pixel array 130 arranged side by side on a substrate 102.

The first color light-emitting diode 112_3B includes at least a first metal layer segment 301_1 and a first color light-emitting layer 302 (as seen in Figure 3B, in top-down order). The second color light-emitting diode 122_3B includes at least a second metal layer segment 301_2 and a second color light-emitting layer 304 (as seen in Figure 3B, in top-down order). The third color light-emitting diode 132_3B includes at least a third metal layer segment 301_3 and a third color light-emitting layer 306 (as seen in Figure 3B, in top-down order).

The scanning probe 100B also includes an insulating layer 310 and a transparent conductive layer 320 covering the first color light-emitting diode 112_3B, the second color light-emitting diode 122_3B, and the third color light-emitting diode 132_3B. The insulating layer 310 has openings that expose portions of the top surfaces of the first color light-emitting layer 302, the second color light-emitting layer 304, and the third color light-emitting layer 306. The transparent conductive layer 320 covers the insulating layer 310 and is formed in the openings of the insulating layer 310, thereby contacting the exposed top surfaces of the first color light-emitting layer 302, the second color light-emitting layer 304, and the third color light-emitting layer 306 through the openings.

The scanning needle 100B further includes light-isolating walls 350 disposed between the first color light-emitting diode 112_3B and the second color light-emitting diode 122_3B, and between the second color light-emitting diode 122_3B and the third color light-emitting diode 132_3B. The height of the light-isolating wall 350 may be greater than the tallest of the first color light-emitting diode 112_3B, the second color light-emitting diode 122_3B, and the third color light-emitting diode 132_3B. In the embodiment shown in FIG. 3B, the first color light-emitting diode 112_3B, the second color light-emitting diode 122_3B, and the third color light-emitting diode 132_B3 have substantially the same height. Therefore, the height of the light-isolating wall 350 is greater than the entirety of the first color light-emitting diode 112_3B, the second color light-emitting diode 122_3B, and the third color light-emitting diode 132_3B.

Furthermore, the scanning needle 100B includes a transparent isolation layer 330 covering the entirety of the first color light-emitting diode 112_3, the second color light-emitting diode 122_3, the third color light-emitting diode 132_3, the insulating layer 310, the transparent conductive layer 320, and the light-isolating wall 350. Additionally, a microlens 360 is formed on each of the first color light-emitting diode 112_3, the second color light-emitting diode 122_3, and the third color light-emitting diode 132_3.

Although Figures 3A and 3B illustrate two examples of the light-emitting pixel structure, the invention is not limited thereto. The first color light-emitting pixel 112, the second color light-emitting pixel 122, and the third color light-emitting pixel 132 can be formed into any structure capable of emitting light of the first color, the second color, and the third color, respectively.

Figure 4 is a top view of a scanning needle 400 according to an embodiment of the present invention. Referring to Figure 4, the scanning needle 400 includes a substrate 402, a first color emitting pixel array 410 including a plurality of first color emitting pixels 412 formed on the substrate 402, a second color emitting pixel array 420 including a plurality of second color emitting pixels 422 formed on the substrate 402, and a third color emitting pixel array 430 including a plurality of third color emitting pixels 432 formed on the substrate 402. The first color emitting pixel array 410 is parallel to the second color emitting pixel array 420, and the second color emitting pixel array 420 is parallel to the third color emitting pixel array 430.

Each of the first color luminescent pixel array 410, the second color luminescent pixel array 420, and the third color luminescent pixel array 430 includes pixels formed in a two-dimensional array (i.e., a matrix) having at least two columns extending in the horizontal direction and at least two rows extending in the vertical direction, as seen in FIG4.

In the embodiment shown in FIG4, the scanning needle 400 further includes a light-isolating wall 450 formed on the substrate 402. The light-isolating wall 450 is disposed between the first color emitting pixel array 410 and the second color emitting pixel array 420, and between the second color emitting pixel array 420 and the third color emitting pixel array 430. The light-isolating wall 450 may be formed of any non-transparent material (e.g., non-transparent metal) to isolate light emitted from the first color emitting pixel array 410, the second color emitting pixel array 420, and the third color emitting pixel array 430.

In the embodiment shown in Figure 4, each of the first color luminescent pixel array 410, the second color luminescent pixel array 420, and the third color luminescent pixel array 430 is an 18 × 2 array, comprising 18 rows extending vertically and 2 columns extending horizontally. In some alternative embodiments of the present invention, each of the first color luminescent pixel array 410, the second color luminescent pixel array 420, and the third color luminescent pixel array 430 may be a 4000 × 50 array, comprising 4000 rows extending vertically and 50 columns extending horizontally.

In some embodiments of the present invention, the first pitch p1 of the first color emitting pixel 412 in both the horizontal and vertical directions (i.e., the distance between the centers of two adjacent first color emitting pixels 412) is less than 5 µm. The second pitch p2 of the second color emitting pixel 422 in both the horizontal and vertical directions (i.e., the distance between the centers of two adjacent second color emitting pixels 422) is less than 5 µm. The third pitch of the third color emitting pixel 432 in both the horizontal and vertical directions (i.e., the distance between the centers of two adjacent third color emitting pixels 432) is less than 5 µm. The first spacing s1 between the first color emitting pixel array 410 and the second color emitting pixel array 420 is less than 100 µm. The second spacing s2 between the second color luminescent pixel array 420 and the third color luminescent pixel array 430 is less than 100 µm.

The aspect ratio of the luminescent pixel array is defined here as the ratio of the width of the luminescent pixel array (i.e., the size of the longer side of the luminescent pixel array) to the length of the luminescent pixel array (i.e., the size of the shorter side of the luminescent pixel array). According to some embodiments of the invention, the aspect ratio of the first color luminescent pixel array 410 is not less than 10:1. According to alternative embodiments of the invention, the aspect ratio of the first color luminescent pixel array 410 is not less than 100:1.

In some embodiments of the present invention, the total dimension of the scanning needle 400 in the vertical direction does not exceed 1 mm. In some embodiments of the present invention, the total aspect ratio of the scanning needle 400 is not less than 3:1.

In a scanning needle according to some embodiments of the present invention, at least one of the first, second, and third color luminescent pixel arrays may be formed as a single column, and at least one of the remaining first, second, and third color luminescent pixel arrays may be formed as a two-dimensional array. For example, the scanning needle may include a first color luminescent pixel array formed as a single column, and a second and third color luminescent pixel arrays each formed as a two-dimensional array.

In some embodiments, the total area of the first color luminescent pixel array 410 may be the same as the total area of the second color luminescent pixel array 420, and the total area of the second color luminescent pixel array 420 may be the same as the total area of the third color luminescent pixel array 430.

Figure 5 is a schematic diagram illustrating a scanning display system 500 according to an embodiment of the present invention. Referring to Figure 5, the scanning display system 500 includes a screen receiving unit 510, a scanning needle 520, a screen display 530 having opposing first surfaces 531 and second surfaces 532, and a driving unit 540.

The image receiving unit 510 is configured to receive image data and coupled to the driving circuit of the scanning needle 520 (e.g., the driving circuit formed in the substrate 102 shown in FIG. 3) to transmit the image data to the driving circuit of the scanning needle 520. The scanning needle 520 is configured to be driven by the driving circuit to emit light 550 representing each of a plurality of portions of an image (hereinafter referred to as "image portions"), and the light 550 representing the plurality of image portions is continuously projected onto the first surface 531 of the image display screen 530. The image display screen 530 is configured to receive the emitted light 550 on the first surface 531 and display the image portions on the second surface 532. The driver unit 540 is coupled to the scanning needle 520 and configured to perform image scanning processing by moving the scanning needle 520, scanning vertically relative to the first surface 531 of the display screen 530 at a predetermined frequency, such that multiple image portions displayed on the second surface 532 of the display screen 530 are continuously arranged along the vertical direction of the display screen 530. The predetermined frequency may be no less than 10 Hz. In other words, the time interval between the recurrence of image portions at their positions on the display screen 530 may be less than 0.1 s. Due to the persistence of vision (when an image disappears, the human eye can retain the image for about 0.1 s to 0.4 s), the display screen 530 displays an image including multiple image parts on the second surface 532.

Figure 6 illustrates the scanning needle 520 and the display screen 530 during image scanning processing when viewed along the Z-axis direction from the front side of the display screen 530 and facing the second surface 532 of the display screen 530 according to an embodiment of the present invention. To facilitate the description of the relative positions of the scanning needle 520 and the display screen 530, the display screen 530 is shown as transparent in Figure 6 to show the scanning needle 520 disposed behind the display screen 530.

As shown in Figure 6, the scanning needle 520 includes a first color luminous pixel array 522 comprising a plurality of first color luminous pixels (not shown), a second color luminous pixel array 524 comprising a plurality of second color luminous pixels (not shown), and a third color luminous pixel array 526 comprising a plurality of third color luminous pixels (not shown). The first color luminous pixel array 522, the second color luminous pixel array 524, and the third color luminous pixel array 526 are arranged parallel to each other and sequentially in the vertical direction.

Figure 7 illustrates a screen 530 having an image 700 displayed on a second surface 532 during image scanning processing, according to an embodiment of the present invention.

Referring to Figures 5, 6, and 7, during image scanning, the scanning needle 520 is driven by the driving unit 540, thereby moving vertically relative to the first surface 531 of the display screen 530. At the initial time point t1 during image scanning, the scanning needle 520 is in its initial position and projects the first image portion 710_1 onto the first and topmost positions on the display screen 530. At the second time point t2, the scanning needle 520 moves downward vertically and projects the second image portion 710_2 onto the second position below the first position on the display screen 530. The image portion 710_2 may be adjacent to the image portion 710_1. Alternatively, the top portion of image portion 710_2 may overlap with the bottom portion of image portion 710_1. At the third time point t3, the scanning needle 520 moves downward in the vertical direction and projects the third image portion 710_3 onto the screen display 530 at a third position below the second position. Image portion 710_3 may be adjacent to image portion 710_2. Alternatively, the top portion of image portion 710_3 may overlap with the bottom portion of image portion 710_2. In this manner, the image scanning process continues, with the scanning needle 520 continuously projecting image portions at consecutive time points until the scanning needle 520 projects the final image portion 710 at the bottom position of the screen display 530. As a result, a complete image 700 formed by image portions 710_1, 710_2, 710_3, ..., and 710_n is displayed on the screen display 530. Then, the driver unit 540 moves the scanning needle 520 back to its initial position, and then projects a series of updated image portions 710_1, 710_2, 710_3, ..., and 710_n onto the screen display 530 to display the updated image. The scanning frequency of the scanning needle 520 is relatively high, so that the human eye can observe continuous images on the screen display 530.

Figure 8 is a schematic diagram illustrating a scanning display system 800 according to an embodiment of the present invention. Referring to Figure 8, the scanning display system 800 includes a screen receiving unit 810, a scanning needle 820, a screen display 830 having opposing first surfaces 831 and second surfaces 832, a driving unit 840, and a projection unit 850.

Image receiving unit 810 is configured to receive image data and coupled to a scanning needle to transmit the image data to scanning needle 820. Scanning needle 820 is configured to continuously emit light 822 at consecutive time points, representing each of multiple portions of an image (hereinafter referred to as "image portions"). Projection unit 850 may include a lens or a mirror and is configured to continuously project light 822 emitted from scanning needle 820, representing multiple image portions, onto a first surface 831 of image display screen 830. Image display screen 830 is configured to receive the projected light 822 on the first surface 831 and display the image portions on a second surface 832. A driver unit 840 is coupled to and configured to perform image scanning processing. This scanning processing redirects light 822 projected from the projection unit 850 by moving a lens or mirror within the projection unit 850, causing the light 822 to move vertically relative to the first surface 831 of the display screen 830 at a predetermined frequency. For example, the driver unit 840 can be configured to rotate or tilt the lens or mirror included in the projection unit 850 to redirect the light 822 emitted from the scanning needle 820 to different positions on the first surface 831 of the display screen. As a result, the display screen 830 displays an image comprising multiple image portions on a second surface 832.

Figure 9 illustrates a screen 830 that has an image 900 displayed on a second surface 832 during image scanning processing, according to an embodiment of the present invention.

Referring to Figures 8 and 9, during image scanning, the projection unit 850 is driven by the driving unit 840 to scan light 822 in the vertical direction relative to the first surface 831 of the display screen 830. At the initial time point t1 during image scanning, the projection unit 850 is in its initial position, projecting the first image portion 910_1 onto the first and topmost positions of the display screen 830. The first image portion 910_1 is light 822 emitted by the scanning needle 820 and represents the image data projected by the projection unit 850. At the second time point t2, the projection unit 850 is moved by the driving unit 840 to project the second image portion 910_2 onto the display screen 830 at a second position below the first position, as seen in Figure 9. Image portion 910_2 may be adjacent to image portion 910_1. Alternatively, the top portion of image portion 910_2 may overlap with the bottom portion of image portion 910_1. At the third time point t3, projection unit 850 is moved by drive unit 840 to project the third image portion 910_3 onto the screen display 830 at a third position below the second position, as seen in Figure 9. Image portion 910_3 may be adjacent to image portion 910_2. Alternatively, the top portion of image portion 910_3 may overlap with the bottom portion of image portion 910_2. In this manner, image scanning continues, with projection unit 850 continuously projecting image portions at consecutive time points until the final image portion 910_n is projected onto the bottom of the display screen 830. As a result, a complete image 900 formed by image portions 910_1, 910_2, 910_3, ..., and 910_n is displayed on the display screen 830. Then, drive unit 840 moves projection unit 850 to its initial position and projects a series of updated image portions 910_1, 910_2, 910_3, ..., and 910_n onto the display screen 830 to display the updated image.

Figure 10 illustrates the scanning needle 1020 and the display screen 1030 when viewed along the Z-axis and facing the display screen 1030 during image scanning processing according to an embodiment of the present invention. To facilitate the depiction of the relative positions of the scanning needle 1020 and the display screen 1030, the display screen 1030 is shown as transparent in Figure 10 to show the scanning needle 1020 disposed behind the display screen 1030.

As shown in Figure 10, the scanning needle 1020 includes a first color luminous pixel array 1022 comprising a plurality of first color luminous pixels (not shown), a second color luminous pixel array 1024 comprising a plurality of second color luminous pixels (not shown), and a third color luminous pixel array 1026 comprising a plurality of third color luminous pixels (not shown). The first color luminous pixel array 1022, the second color luminous pixel array 1024, and the third color luminous pixel array 1026 are parallel to each other and arranged sequentially in the horizontal direction.

Figure 11 illustrates a screen 1030 having an image 1100 displayed on a surface during image scanning processing, according to an embodiment of the present invention.

Referring to Figures 10 and 11, during image scanning, the scanning needle 1020 can be driven by a driving unit (such as driving unit 540 in Figure 5) to move horizontally relative to the display screen 1030. At the initial time point t1 during image scanning, the scanning needle 1020 is in the initial position and projects the first image portion 1110_1 onto the first and leftmost positions on the display screen 1030. At the second time point t2, the scanning needle 1020 moves horizontally and projects the second image portion 1110_2 onto the second position to the right of the first position on the display screen 1030, as seen in Figure 11. The second image portion 1110_2 may be adjacent to the image portion 1110_1. Alternatively, the left portion of the image portion 1110_2 may overlap with the right portion of the image portion 1110_1. At the third time point t3, the scanning needle 1020 moves further in the horizontal direction and projects the third image portion 1110_3 onto the display screen 1030 at a third position to the right of the second position, as seen in Figure 11. The image portion 1110_3 may be adjacent to the image portion 1110_2. Alternatively, the left portion of the image portion 1110_3 may overlap with the right portion of the image portion 1110_2. In this manner, the image scanning process continues, with the scanning needle 1020 continuously projecting image portions at consecutive time points until the final image portion 1110 is projected onto the rightmost position of the display screen 1030. As a result, the complete image 1100 formed by image portions 1110_1, 1110_2, 1110_3, ..., 1110_n is displayed on the display screen 1030. Then, the scanning needle 1020 is moved back to its initial position, and a series of updated image portions 1110_1, 1110_2, 1110_3, ..., 1110_n are projected onto the display screen 1030 to display the updated image.

In some alternative embodiments of the present invention (not shown), a projection unit (such as projection unit 850 in FIG. 8) can be used to project light emitted from the scanning needle 1020 onto the screen display 1030, and the projection unit can be driven by a driving unit (such as driving unit 840 in FIG. 8) to perform image scanning processing, thereby scanning the light horizontally relative to the screen display 1030. Except that, in the present embodiment, the light emitted from the scanning needle 1020 is scanned horizontally rather than vertically, the image scanning processing can be similar to the image scanning processing described with respect to FIG. 8 and FIG. 9. Therefore, a detailed description of this alternative embodiment is not repeated.

In some alternative embodiments of the invention (not shown), the scanning needle may not be positioned relative to the display screen in a horizontal or vertical direction. Instead, one side of the scanning needle may form an angle greater than 0 degrees and less than 90 degrees with one side of the display screen.

Figure 12 illustrates the scanning needle 1220 and the display screen 1230 during image scanning processing, viewed along the Z-axis and facing the display screen 1230, according to an embodiment of the present invention. For ease of depicting the relative positions of the scanning needle 1220 and the display screen 1230, the display screen 1230 is shown as transparent in Figure 12 to show the scanning needle 1220 positioned behind the display screen 1230.

The scanning needle 1220 includes only one pixel, which comprises at least one of a first color light-emitting diode (LED), a second color LED, and a third color LED. The aspect ratio of the pixel included in the scanning needle 1220 is not less than 1:3. The horizontal dimension of the pixel is not more than 50 μm and can be in the range of 10 μm to 12 μm. The vertical dimension of the pixel is not more than 50 μm and can be in the range of 10 μm to 30 μm. In one embodiment, the size of a single LED is in the range of 0.5 μm to 50 μm. The pixel is circular or rectangular in shape. In some embodiments, the pixel includes a red LED, a blue LED, and a green LED. The area of the red light-emitting diode is larger than that of the blue light-emitting diode, and the area of the blue light-emitting diode is larger than that of the green light-emitting diode.

Figure 13 illustrates a screen 1230 having an image 1300 displayed thereon during image scanning processing, according to an embodiment of the present invention.

Referring to Figures 12 and 13, during image scanning, the scanning needle 1220 can be driven by a driving unit (such as driving unit 540 in Figure 5) to move horizontally and vertically relative to the display screen 1230. At the initial time point t1 during image scanning, the scanning needle 1220 is in its initial position and projects the image portion 1310_1_1 onto the leftmost position of the first column on the display screen 1230. At the second time point t2, the scanning needle 1220 moves horizontally and projects the image portion 1310_1_2 onto the right side of the previous position on the display screen 1230. In this manner, the image scanning process continues until the scanning needle 1220 projects the image portion 1310_1_m onto the upper right position of the display screen 1230. Next, the scanning needle 1220 is moved back to the left horizontally and downwards vertically to project the image portion 1310_2_1 onto the leftmost position of the second column on the display screen 1230. The drive unit continues to move the scanning needle 1220 to scan horizontally, thereby projecting the image portions 1310_2_2, ..., 1310_2_m onto the second column of the display screen 1230. The processing continues until the scanning needle 1220 projects image portions 1310_n_1, 1310_n_2, ..., 1310_n_m onto the bottom column of the display screen 1230. As a result, a complete image 1300 formed by image portions 1310_1_1, ..., and 1310_n_m is displayed on the display screen 1230. Then, the drive unit moves the scanning needle 1020 back to its initial position and projects a series of updated image portions 1310_1_1, ..., and 1310_n_m onto the display screen 1230 to display the updated image.

In an alternative embodiment of the present invention (not shown), a projection unit (such as projection unit 850 in FIG. 8) is used to project light emitted from the scanning needle 1220 onto the screen display 1230, and the projection unit can be driven by a driving unit (such as driving unit 840 in FIG. 8) to perform image scanning processing, thereby scanning light relative to the screen display 1230 in both horizontal and vertical directions. Except that, in the alternative embodiment, the light emitted from the scanning needle 1220 scans in both horizontal and vertical directions, rather than just vertically, the image scanning processing is similar to the image scanning processing described with respect to FIG. 8 and FIG. 9. Therefore, the detailed description of this alternative embodiment is not repeated.

In the above embodiments of the present invention, the scanning display system includes a scanning needle comprising only three light-emitting pixel arrays, or even fewer than three light-emitting pixel arrays. The scanning needle has an area smaller than the total display area of the screen. Therefore, compared to conventional display systems that include light-emitting pixels formed on the entire display area, the scanning display system of the present invention includes far fewer light-emitting pixels. As a result, the manufacturing process can be simplified, manufacturing costs reduced, power consumption lowered, and package size reduced.

From the above discussion, it will be understood that the present invention can be embodied in various exemplary forms, including but not limited to the following examples:

Example 1: A scanning needle includes: a substrate; a first color luminescent pixel array including a plurality of first color luminescent pixels formed on the substrate; a second color luminescent pixel array including a plurality of second color luminescent pixels formed on the substrate; and a third color luminescent pixel array including a plurality of third color luminescent pixels formed on the substrate, wherein the first color luminescent pixel array is parallel to the second color luminescent pixel array, and the second color luminescent pixel array is parallel to the third color luminescent pixel array.

Example 2, the scanning needle as described in Example 1, wherein: the plurality of first color luminescent pixels in the first color luminescent pixel array are formed in a single column or in a two-dimensional array having at least two columns and two rows; the plurality of second color luminescent pixels in the second color luminescent pixel array are formed in a single column or in a two-dimensional array having at least two columns and two rows; and the plurality of third color luminescent pixels in the third color luminescent pixel array are formed in a single column or in a two-dimensional array having at least two columns and two rows.

Example 3, the scanning needle as described in Example 2, wherein: the first color luminescent pixel array is a 4000×50 array; the second color luminescent pixel array is a 4000×50 array; and the third color luminescent pixel array is a 4000×50 array.

Example 4, a scanning needle as described in Example 1, wherein: a pitch of the first color luminescent pixels in one column of the first color luminescent pixel array is less than 5 μm; a spacing between the first color luminescent pixel array and the second color luminescent pixel array is less than 100 μm; a pitch of the second color luminescent pixels in one column of the second color luminescent pixel array is less than 5 μm; a spacing between the second color luminescent pixel array and the third color luminescent pixel array is less than 100 μm; and a pitch of the third color luminescent pixels in one column of the third color luminescent pixel array is less than 5 μm.

Example 5, a scanning needle as described in Example 1, wherein: the aspect ratio of one of the first color luminous pixel arrays is not less than 10:1; a size of one of the first color luminous pixels in the column direction of the first color luminous pixel array is the same as a size of one of the second color luminous pixels in the column direction of the second color luminous pixel array; and the size of that second color luminous pixel in the column direction of the second color luminous pixel array is the same as a size of one of the third color luminous pixels in the column direction of the third color luminous pixel array.

Example 6, a scanning needle as described in Example 5, wherein the aspect ratio of the first color luminescent pixel array is not less than 100:1.

Example 7, a scanning needle as described in Example 1, wherein: each of the first color luminescent pixels includes a first color luminescent diode; each of the second color luminescent pixels includes a second color luminescent diode; and each of the third color luminescent pixels includes a third color luminescent diode.

Example 8, a scanning needle as described in Example 1, wherein the total width of one of the scanning needles is not greater than 1 mm.

Example 9, a scanning needle as described in Example 8, wherein one of the scanning needles has an overall aspect ratio of not less than 3:1.

Example 10, a scanning needle as described in Example 1, wherein: the number of one of the first color luminous pixels in the first color luminous pixel array is the same as the number of one of the second color luminous pixels in the second color luminous pixel array; and the number of the second color luminous pixels in the second color luminous pixel array is the same as the number of one of the third color luminous pixels in the third color luminous pixel array.

Example 11, the scanning needle as described in Example 1, wherein each of the first color luminescent pixels, the second color luminescent pixels, and the third color luminescent pixels has a circular or rectangular shape.

Example 12, a scanning needle as described in Example 1, wherein: each of the first color-emitting pixels includes a red color-emitting pixel; each of the second color-emitting pixels includes a blue color-emitting pixel; and each of the third color-emitting pixels includes a green color-emitting pixel.

Example 13, a scanning needle as described in Example 12, wherein: one of the first color luminescent pixels has an area larger than one of the second color luminescent pixels; and one of the second color luminescent pixels has an area larger than one of the third color luminescent pixels.

Example 14, the scanning needle as described in Example 1, further includes: a plurality of light isolation walls formed on the substrate and between the first color emitting pixel array and the second color emitting pixel array, and between the second color emitting pixel array and the third color emitting pixel array.

Example 15, a scanning needle as described in Example 14, wherein the height of one of the light isolation walls is greater than the height of the tallest of the first color emitting pixels, the second color emitting pixels, and the third color emitting pixels.

Example 16, a scanning needle as described in Example 1, wherein one of the first color luminescent pixels has the same area as one of the second color luminescent pixels, and the area of one of the second color luminescent pixels has the same area as one of the third color luminescent pixels.

Example 17, a scanning needle as described in Example 1, wherein: the area of one of the first color luminous pixels is larger than the area of one of the second color luminous pixels; and the area of one of the second luminous pixels is larger than the area of one of the third luminous pixels.

Example 18, a scanning needle as described in Example 1, wherein: one of the first color luminescent pixels includes a first segment of a first color luminescent layer formed on the substrate; one of the second color luminescent pixels includes a second segment of the first color luminescent layer formed on the substrate and a first segment of a second color luminescent layer formed above the second segment of the first color luminescent layer; and one of the third color luminescent pixels includes a third segment of the first color luminescent layer formed on the substrate, a second segment of the second color luminescent layer formed above the third segment of the first color luminescent layer, and a third color luminescent layer formed above the second segment of the second color luminescent layer.

Example 19, a scanning needle as described in Example 1, wherein: one of the first color luminescent pixels includes a first color luminescent layer formed on the substrate; one of the second color luminescent pixels includes a second color luminescent layer formed on the substrate; and one of the third color luminescent pixels includes a third color luminescent layer formed on the substrate.

Example 20, the scanning needle as described in Example 1, further includes: a plurality of microlenses formed on at least one of the first color luminescent pixels, the second color luminescent pixels, and the third color luminescent pixels.

Example 21, a scanning display system, comprising: an image receiving unit; a scanning needle; an image display screen having opposing first and second surfaces; and a driving unit, wherein: the image receiving unit is configured to receive image data and coupled to the scanning needle to transmit the image data to the scanning needle; the driving unit is coupled to the scanning needle and configured to be positioned relative to the image display screen by moving the scanning needle. The first surface of the screen performs an image scanning process by scanning in a vertical direction at a predetermined frequency. The scanning needle is configured to emit light representing the image data onto the first surface of the screen to project several image lines. Each image line is projected by the scanning needle during the scanning process. The screen is configured to receive the emitted light on the first surface and display an image containing the image lines on the second surface.

Example 22, a scanning display system as described in Example 21, wherein the scanning needle includes the scanning needle as in any of Examples 1 to 20.

Example 23, a scanning display system, comprising: an image receiving unit; a scanning needle; a screen having opposing first and second surfaces; a projection unit; and a driving unit, wherein: the image receiving unit is configured to receive image data and coupled to the scanning needle to transmit the image data to the scanning needle; the scanning needle is configured to emit light representing the image data; and the projection unit is configured to project the light emitted from the scanning needle onto the screen. The first surface of the display screen, the driving unit coupled to the projection unit and configured to perform an image scanning process, the image scanning process being performed by moving the projection unit to scan the light projected from the projection unit in a vertical direction at a predetermined frequency relative to the first surface of the image display screen, so as to form a plurality of image lines, and the image display screen being configured to receive the projected light on the first surface and display an image including the image lines on the second surface.

Example 24, a scanning display system as described in Example 23, wherein the scanning needle includes the scanning needle as in any of Examples 1 to 20.

Example 25, a scanning display system, comprising: an image receiving unit; a scanning needle; a screen having opposing first and second surfaces; and a driving unit, wherein: the image receiving unit is configured to receive image data and coupled to the scanning needle to transmit the image data to the scanning needle; the driving unit is coupled to the scanning needle and configured to be positioned relative to the image display screen by moving the scanning needle. The first surface of the screen performs an image scanning process by scanning at a predetermined frequency in a horizontal direction; the scanning needle is configured to emit light representing the image data onto the first surface of the screen to project a number of image lines, each image line being formed by the scanning needle during the scanning, and the screen is configured to receive the emitted light on the first surface and display an image containing the image lines on the second surface.

Example 26, a scanning display system as described in Example 25, wherein the scanning needle includes the scanning needle as in any of Examples 1 to 20.

Example 27, a scanning display system, comprising: an image receiving unit; a scanning needle; a screen having opposing first surfaces and second surfaces; and a driving unit, wherein: the image receiving unit is configured to receive image data and coupled to the scanning needle to transmit the image data to the scanning needle; the driving unit is coupled to the scanning needle and configured to move relative to the first surface of the image display screen by moving the scanning needle. An image scanning process is performed by scanning a surface at a predetermined frequency in a horizontal and a vertical direction. The scanning needles are configured to emit light representing the image data onto the first surface of the image display screen to project several image portions, each image portion being formed by the scanning needles during the scanning process. The image display screen is configured to receive the emitted light on the first surface and display an image containing the image portions on the second surface.

Example 28, a scanning display system as described in Example 27, wherein the scanning needle includes only one pixel, the pixel comprising at least one color light-emitting diode.

Example 29, a scanning display system as described in Example 28, wherein one of the pixels has an aspect ratio of not less than 1:3.

Example 30, a scanning display system as described in Example 28, wherein one dimension of the pixel in the horizontal direction is not greater than 12 μm and one dimension of the pixel in the vertical direction is not greater than 30 μm.

Example 31, a scanning display system as described in Example 30, wherein the size of the pixel in the horizontal direction is 10 to 12 μm, and the size of the pixel in the vertical direction is 10 μm to 30 μm.

Example 32, a scanning display system as described in Example 28, wherein the pixel includes at least one red light-emitting diode, at least one blue light-emitting diode, and/or at least one green light-emitting diode.

Example 33, a scanning display system as described in Example 28, wherein one of the pixels is circular or rectangular in shape.

Example 34, a scanning display system as described in Example 28, wherein the pixel includes a red light-emitting diode, a blue light-emitting diode, and a green light-emitting diode, the red light-emitting diode being larger than the blue light-emitting diode, and the blue light-emitting diode being larger than the green light-emitting diode.

Example 35, a scanning display system as described in Example 28, wherein the pixel includes a first color light-emitting diode, a second color light-emitting diode, or a third color light-emitting diode.

Example 36, a scanning display system as described in Example 28, wherein the pixel includes a first color light-emitting diode, a second color light-emitting diode, and a third color light-emitting diode.

Example 37, a scanning display system as described in Example 36, wherein the area of one of the first color light-emitting diodes is the same as the area of one of the second color light-emitting diodes, and the area of the second color light-emitting diode is the same as the area of one of the third color light-emitting diodes.

Example 38, a scanning display system as described in Example 36, wherein the area of one of the first color light-emitting diodes is larger than the area of one of the second color light-emitting diodes, and the area of the second color light-emitting diode is larger than the area of one of the third color light-emitting diodes.

Example 39, a scanning display system as described in Example 36, wherein the scanning probe further includes: a plurality of light-isolating walls formed on a substrate and between the first color light-emitting diode and the second color light-emitting diode, and between the second color light-emitting diode and the third color light-emitting diode.

Example 40, a scanning display system as described in Example 39, wherein the height of one of the light isolation walls is greater than the height of the tallest of the first color light-emitting diode, the second color light-emitting diode, and the third color light-emitting diode.

Example 41, a scanning display system as described in Example 36, wherein: the first color light-emitting diode includes a first segment of a first color light-emitting layer formed on a substrate; the second color light-emitting diode includes a second segment of the first color light-emitting layer formed on the substrate, and a first segment of a second color light-emitting layer formed above the second segment of the first color light-emitting layer; and the third color light-emitting diode includes a third segment of the first color light-emitting layer formed on the substrate, a second segment of the second color light-emitting layer formed above the third segment of the first color light-emitting layer, and a third color light-emitting layer formed above the second segment of the second color light-emitting layer.

Example 42, a scanning display system as described in Example 41, wherein: the height of one of the first color light-emitting diodes is less than the height of one of the second color light-emitting diodes; and the height of the second color light-emitting diode is less than the height of one of the third color light-emitting diodes.

Example 43, a scanning display system as described in Example 36, wherein: the first color light-emitting diode includes a first color light-emitting layer formed on a substrate; the second color light-emitting diode includes a second color light-emitting layer formed on the substrate; and the third color light-emitting diode includes a third color light-emitting layer formed on the substrate.

Example 44, a scanning display system as described in Example 36, wherein the scanning probe further includes a plurality of microlenses formed on at least one of the first color light-emitting diode, the second color light-emitting diode, and the third color light-emitting diode.

Example 45, a scanning display system as described in Example 28, wherein the scanning needle further includes a microlens formed on the pixel.

Example 46, a scanning display system, comprising: an image receiving unit; a scanning needle; a screen having opposing first and second surfaces; and a driving unit, wherein: the image receiving unit is configured to receive image data and coupled to the scanning needle to transmit the image data to the scanning needle, and the driving unit is coupled to the scanning needle and, via... The device is configured to perform image scanning processing by moving the scanning needle to scan the first surface of the image display screen at a predetermined frequency in both a horizontal and a vertical direction. The scanning needle is configured to emit light representing the image data onto the first surface of the image display screen to project several image portions. Each image portion is shaped by the scanning needle during the scanning process. The display screen is configured to receive the emitted light on the first surface and display an image including the image portions on the second surface. The scanning needle includes: a substrate; a first color luminescent pixel array including a plurality of first color luminescent pixels; a second color luminescent pixel array including a plurality of second color luminescent pixels; and a third color luminescent pixel array including a plurality of third color luminescent pixels. The first color luminescent pixel array is parallel to the second color luminescent pixel array, and the second color luminescent pixel array is parallel to the third color luminescent pixel array. The first color luminescent pixel array, the second color luminescent pixel array, and the third color luminescent pixel array extend in the horizontal direction.

Example 47, a scanning display system as described in Example 46, wherein the scanning needle includes the scanning needle as in any of Examples 2 to 20.

Other embodiments of the invention will be apparent to those skilled in the art from the description and specifications disclosed herein. This description and examples are to be considered illustrative only, and the true scope and spirit of the invention are indicated by the following patent application.

100, 100A, 100B, 400, 520, 820, 1020, 1220: Scanning needle; 102, 402: Substrate; 110, 410, 522, 1022: First color emitting pixel array; 112, 112_1, 112_2, 112_3A, 412: First color emitting pixel; 112_3B: First color emitting diode; 120, 420, 524, 1024: Second color emitting pixel array; 122, 122_1, 122_2, 122_3A, 422: Second color emitting pixel; 122_3B: Second color emitting diode; 130, 430, 526, 1026: Third color emitting pixel array. 132, 132_1, 132_2, 132_3A, 432: Third color luminescent pixel; 132_3B: Third color luminescent diode; 150, 350, 450: Optical isolation wall; 301_1: First segment of the first metal layer; 301_2: Second segment of the first metal layer; 301_3: Third segment of the first metal layer; 302: First color luminescent layer; 302_1: First segment of the first color luminescent layer; 302_2: Second segment of the first color luminescent layer; 302_3: Third segment of the first color luminescent layer; 304: Second color luminescent layer; 304_1: First segment of the second color luminescent layer; 304_2: Second segment of the second color luminescent layer; 305: Third metal layer. 306: Third color luminescent layer; 307: First electrical connector; 308: Second electrical connector; 310: Insulation layer; 320: Transparent conductive layer; 330: Transparent isolation layer; 360: Microlens; 500, 800: Scanning display system; 510, 810: Image receiving unit; 530, 830, 1030, 1230: Image display screen; 531, 831: First surface; 532, 832: Second surface; 540, 840: Driver unit; 550, 822: Light; 700, 900, 1100, 1300: Image; 710_1, 910_1, 1110_1: First image section. 710_2, 910_2, 1110_2: Second image portion; 710_3, 910_3, 1110_3: Third image portion; 710_n, 1110_n: Image portion; 850: Projection unit; 910_n: Final image portion; 1310_1_1, 1310_1_2, 1310_1_m: Image portion projected onto the first column of the display screen 1230; 1310_2_1, 1310_2_2, 1310_n_1: Image portion projected onto the second column of the display screen 1230; 1310_n_2, 1310_n_m: Image portion projected onto the bottom column of the display screen 1230; A: Area; B-B': Section line; p1: First pitch; p2: Second pitch. p3: Third pitch; s1: First pitch; s2: Second pitch; X, Y, Z: Axis

Figure 1 is a top view of a scanning needle according to an embodiment of the present invention.

Figures 2A and 2B are enlarged top views of the area of the scanning needle in Figure 1 according to embodiments of the present invention.

Figure 3A is a cross-sectional view of the scanning needle along section line B-B' of Figure 1 according to an embodiment of the present invention.

Figure 3B is a cross-sectional view of the scanning needle along section line B-B' of Figure 1 according to another embodiment of the present invention.

Figure 4 is a top view of a scanning needle according to an embodiment of the present invention.

Figure 5 is a schematic diagram of a scanning display system according to an embodiment of the present invention.

Figure 6 is a top view of the scanning needle and the screen during image scanning processing according to an embodiment of the present invention.

Figure 7 is a top view of a screen displaying an image displayed thereon during image scanning processing, according to an embodiment of the present invention.

Figure 8 is a schematic diagram of a scanning display system according to an embodiment of the present invention.

Figure 9 is a top view of a screen displaying an image displayed thereon during image scanning processing, according to an embodiment of the present invention.

Figure 10 is a top view of the scanning needle and the screen during image scanning processing according to an embodiment of the present invention.

Figure 11 is a top view of a screen displaying an image displayed thereon during image scanning processing, according to an embodiment of the present invention.

Figure 12 is a top view of the scanning needle and the screen during image scanning processing according to an embodiment of the present invention.

Figure 13 is a top view of a screen displaying an image displayed thereon during image scanning processing, according to an embodiment of the present invention.

100: Scanner

102:Substrate

110: First color luminescent pixel array

112: First color luminescent pixel

120: Second color luminescent pixel array

122: Second color luminescent pixel

130: Third color luminescent pixel array

132: Third color luminescent pixel

150: Light-isolating wall

A: Region

B-B': Section line

p1: First pitch

p2: Second pitch

p3: Third pitch

s1: First spacing

s2: Second spacing

Claims (33)

A miniature light-emitting diode (LED) structure includes: a substrate; and at least one miniature LED formed on the substrate, wherein the at least one miniature LED includes: a metal layer formed on the substrate; a light-emitting layer formed on the metal layer; an insulating layer covering the miniature LED and including an opening exposing a portion of the light-emitting layer; and a transparent conductive layer electrically connected to the light-emitting layer on the insulating layer and through the opening in the insulating layer. The microLED structure as described in claim 1 further includes: a microlens formed on the microLED. The microLED structure as described in claim 2, wherein the microlens is perpendicularly aligned with the microLED. The microLED structure as described in claim 2 includes: a plurality of microLEDs; a plurality of microlenses; and a transparent spacer layer that is over the plurality of microLEDs and formed between the plurality of microlenses and the plurality of microLEDs. The micro-LED structure as described in claim 4, wherein the transparent isolation layer includes an exposed surface formed between adjacent microlenses and not covered by the plurality of microlenses. The micro LED structure as described in claim 1, wherein the outline of the light-emitting layer, which is projected vertically onto a top surface of the substrate, is surrounded by the outline of the metal layer, which is projected vertically onto the top surface of the substrate. The micro-LED structure as described in claim 1, wherein the insulating layer includes a protrusion projecting in a direction away from the substrate, the protrusion surrounding the opening of the insulating layer. The micro LED structure as described in claim 1, wherein the insulating layer includes at least one stepped structure corresponding to the metal layer. The micro-LED structure as described in claim 4, wherein the plurality of such micro-LEDs are arranged side by side. The microLED structure as described in claim 5 includes: a light-isolating wall formed on the transparent conductive layer between adjacent microLEDs. The micro-LED structure as described in claim 10, wherein the height of the light-isolating wall is greater than or equal to the height of the adjacent micro-LEDs. The micro-LED structure as described in claim 10, wherein the light-isolating wall is formed beneath the exposed surface of the transparent isolation layer. The micro-LED structure as described in claim 9, wherein the plurality of micro-LEDs are assembled to emit light having the same color. The micro-LED structure as described in claim 9, wherein the plurality of micro-LEDs are configured to emit light of different colors. The micro-LED structure as described in claim 9, wherein the plurality of such micro-LEDs are arranged in an array. The micro-LED structure as described in claim 9, wherein each of the plurality of micro-LEDs is configured to emit light having a single color selected from red, green, blue, yellow, orange and cyan. The micro-LED structure as described in claim 9, wherein a pixel is formed by an array of the plurality of micro-LEDs or one of the plurality of micro-LEDs. The micro-LED structure described in claim 9, wherein the spacing between adjacent micro-LEDs is less than 5 μm. The micro-LED structure as described in claim 9, wherein the plurality of micro-LEDs are formed to have the same size. The microLED structure as described in claim 9, wherein the plurality of microLEDs are formed to have different sizes. The microLED structure as described in claim 1, wherein the substrate includes: a driving circuit configured to control the at least one microLED; and an interconnect layer electrically connected to the metal layer of the at least one microLED. The micro LED structure as described in claim 1, wherein the metal layer contacts an entire bottom surface of the light-emitting layer. The microLED structure as described in claim 1, wherein the insulating layer is formed on at least one sidewall of the at least one microLED. The micro-LED structure as described in claim 23, wherein the insulating layer is further formed on a surface of the sidewall of the metal layer. The micro-LED structure as described in claim 23, wherein the insulating layer is further formed on the substrate on one side of the metal layer. The micro LED structure as described in claim 1, wherein the light-emitting layer comprises multiple layers. The micro-LED structure as described in claim 9, wherein the insulating layer continuously covers the plurality of the micro-LEDs. The micro-LED structure as described in claim 10, wherein the light-isolating wall is formed of a non-transparent material or metal. The micro-LED structure as described in claim 1, wherein a dimension of a top surface region of the metal layer is larger than a dimension of a bottom surface region of the light-emitting layer. The micro-LED structure as described in claim 1, wherein a dimension of a top surface region of the metal layer is the same as a dimension of a bottom surface region of the light-emitting layer. The micro-LED structure as described in claim 1, wherein the opening in the insulation layer exposes a top surface of the entire light-emitting layer. The micro-LED structure as described in claim 10, wherein a bottom of the light-isolating wall is lower than a bottom surface of the light-emitting layer or a top surface of the metal layer. The micro LED structure as described in claim 1, wherein a bottom of the transparent conductive layer is lower than a bottom surface of the light-emitting layer or a top surface of the metal layer.