KR-20260067950-A - LIGHT GUIDE DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME

KR20260067950AKR 20260067950 AKR20260067950 AKR 20260067950AKR-20260067950-A

Abstract

A light guide device according to an embodiment of the present invention comprises an input diffraction element, a transfer diffraction element, and a substrate on which the input diffraction element and the transfer diffraction element are arranged. The transfer diffraction element comprises a first region and a second region formed by being divided into two parts. The first region comprises a first grating pattern, and the height of the first grating pattern changes in a direction away from the input diffraction element. The second region comprises a second grating pattern, and the height of the second grating pattern also changes in a direction away from the input diffraction element. The heights of the first grating pattern and the second grating pattern may be different from each other.

Inventors

문귀영
이규태
이주호

Assignees

엘지이노텍 주식회사

Dates

Publication Date: 20260513
Application Date: 20250217
Priority Date: 20241106

Claims (10)

Input diffraction element; Transfer diffraction element; and A substrate having the input diffraction element and the transfer diffraction element disposed thereon, The above-mentioned transfer diffraction element includes a first region and a second region formed by dividing into two, and The first region includes a first grating pattern, and the height of the first grating pattern changes in a direction away from the input diffraction element, and The second region includes a second grating pattern, and the height of the second grating pattern also changes in a direction away from the input diffraction element, and A light guide device in which the heights of the first grid pattern and the second grid pattern are different.
In paragraph 1, It further includes an output diffraction element, and The above second region is a light guide device disposed between the above first region and the above output diffraction element.
In paragraph 1, The above transfer diffraction element has a first side closest to the input diffraction element and a second side facing the first side, It includes a third side and a fourth side positioned between the first side and the second side and positioned to face each other, The above first region and the above second region are distinguished by a first line, and The first line above is a line connecting the center of the first side and the center of the second side, and A light guide device in which the length of the first side is shorter than the length of the second side.
In paragraph 3, A light guide device in which the maximum height of the first grid pattern is greater than the maximum height of the second grid pattern.
In paragraph 3, A light guide device in which the difference between the highest and lowest heights of the first grid pattern is greater than the difference between the highest and lowest heights of the second grid pattern.
In paragraph 3, A light guide device in which the lowest height of the first grid pattern is equal to or greater than the lowest height of the second grid pattern.
In paragraph 3, A light guide device in which, among the regions in which the first region is divided into multiple regions, the region furthest from the input diffraction element has the highest height of the first grating pattern.
In Paragraph 7, A light guide device in which the region with the smallest height difference between the first grating pattern and the second grating pattern is the region closest to the input diffraction element among the regions into which the first region is divided into multiple regions.
In Paragraph 7, A light guide device in which the region with the largest height difference between the first grating pattern and the second grating pattern is the region furthest from the input diffraction element among the regions into which the first region is divided into multiple regions.
In paragraph 3, A light guide device in which the height of the second grid pattern is highest in the middle region or the region next to the middle among the regions in which the second region is divided into multiple regions.

Description

Light guide device and electronic device including the same The present invention relates to a light guide device and an electronic device including the same, and more specifically, to a light guide device including a diffraction element for changing the direction of leaking light and an electronic device including the same. Virtual Reality (VR) refers to a specific environment or situation, or the technology itself, created using artificial technology such as computers that is similar to reality but is not actually real. Augmented Reality (AR) refers to a technology that superimposes virtual objects or information onto a real environment to make them appear as if they exist in the original environment. Mixed Reality (MR) or Hybrid Reality refers to the creation of new environments or new information by combining the virtual world and the real world. In particular, it is called Mixed Reality when referring to the ability to interact in real time between things existing in the real world and the virtual world. In this case, the created virtual environment or situation stimulates the user's five senses and enables spatial and temporal experiences similar to reality, thereby allowing the user to freely cross the boundary between reality and imagination. Furthermore, the user can not only simply immerse themselves in this environment but also interact with the elements implemented within it, such as by using actual devices to perform operations or issue commands. Recently, active research has been conducted on equipment (gear, devices) used in these technological fields. In particular, these devices include diffraction elements that perform the functions of diffraction and/or total internal reflection of incident light. However, there is a problem in that increasing the diffraction efficiency of the diffraction element can lead to reduced light uniformity because light cannot be transmitted, while increasing the total internal reflection efficiency lowers the overall efficiency of the device; therefore, research is being conducted to resolve these issues. FIG. 1 is a block diagram showing the configuration of an electronic device including a light guide device according to an embodiment of the present invention. FIG. 2 is a perspective view of an electronic device including a light guide device according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a light guide device according to an embodiment of the present invention. FIG. 4 is a drawing showing the grating pattern of a diffraction element included in a light guide device according to an embodiment of the present invention. FIGS. 5a to 5e show various examples to compare the uniformity and efficiency of an optical guide device according to the modulation dimension of a transfer diffraction element. FIG. 6 is a drawing showing an optical guide device including a 6x2 divided transfer diffraction element according to one embodiment of the present invention. Figures 7a and 7b show the distribution of diffraction efficiency and reflection efficiency according to the height of the grating pattern and the fill factor in a transfer diffraction element. FIGS. 8A and 8B are graphs showing the change in height and efficiency according to each column of a transfer diffraction element according to an embodiment of the present invention. FIGS. 9a and 9b are graphs showing the efficiency according to each column of a transfer diffraction element including a 7x2 region according to an embodiment of the present invention. FIG. 10 is a diagram showing an example of a grating pattern of a diffraction element included in a light guide device according to an embodiment of the present invention. FIG. 11 is a perspective view showing an example of a grating pattern in the transfer diffraction element of FIG. 9b. FIG. 12a is a diagram showing divided regions of the transfer diffraction element of FIG. 11, FIG. 12b is a side view of the first column of the transfer diffraction element, and FIG. 12c is a side view of the second column of the transfer diffraction element. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted. In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a meaning that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant t