KR-102961526-B1 - Light path control member, and display device including same

Abstract

A light path control member according to one embodiment includes a first substrate; a first electrode disposed on the first substrate; a light conversion unit disposed on the first electrode; a second substrate disposed on the light conversion unit; a second electrode disposed between the second substrate and the light conversion unit; and a barrier disposed on the upper surface of the second substrate.

Inventors

• 이상현
• 박민수

Assignees

• 엘지디스플레이 주식회사

Dates

Publication Date

20260507

Application Date

20221212

Claims (20)

1. First substrate; A first electrode disposed on the first substrate; A light conversion unit disposed on the first electrode; A second substrate disposed on the above-mentioned light conversion unit; A second electrode disposed between the second substrate and the light conversion unit; and It includes a barrier disposed on the upper surface of the second substrate, and The above barrier is provided in a plurality, and the plurality of barriers each extend in a first direction and are spaced apart from each other in a second direction that intersects the first direction, forming an optical path control member.
2. In Article 1, The light conversion member comprises a light transmission member and a light path variable member around the light transmission member.
3. In Article 2, The above optical path variable member is an optical path control member that changes the path of light provided according to the application of voltage.
4. In Article 2, The above optical path variable part is an optical path control member comprising a dispersion and light-absorbing particles within the dispersion.
5. In Paragraph 4, In the first mode, the light-absorbing particles are a light path control member disposed adjacent to the second electrode.
6. In Article 5, An optical path control member in which, in the first mode, a (+) voltage is applied to the second electrode and a (-) voltage is applied to the first electrode.
7. In Article 5, In the second mode, the light-absorbing particles are a light path control member disposed adjacent to the first electrode.
8. In Article 7, An optical path control member in which, in the second mode, a (-) voltage is applied to the second electrode and a (+) voltage is applied to the first electrode.
9. In Article 7, A light path control member in which, in a third mode, the light-absorbing particles are disposed adjacent to the first electrode, and in the third mode, no voltage is applied to each of the first electrode and the second electrode.
10. In Article 7, In the third mode, the light-absorbing particles are light path control members dispersed within the dispersion.
11. In Article 2, The optical path control member is provided with a plurality of optical path variable members, and the optical path transmitting member is disposed between adjacent optical path variable members on a plane.
12. In Article 11, The second electrode above is a light path control member comprising a light-absorbing material.
13. In Article 12, The above second electrode is provided in a plurality, and the plurality of the second electrodes each overlap with the optical path variable portions in the thickness direction, forming an optical path control member.
14. In Article 11, The above barrier is a light path control member comprising a light-absorbing material.
15. In Article 14, A plurality of barriers each overlaps with the optical path variable portions in the thickness direction, and an optical path control member in which the plurality of barriers each do not overlap with the light-transmitting portion in the thickness direction.
16. In Article 1, An optical path control member having a barrier thickness of 30 nm to 50 nm.
17. In Article 1, An optical path control member in which the thickness of the second electrode is smaller than the thickness of the barrier.
18. Display panel; and Includes a light path control member on the above-mentioned display panel, The above optical path control member is, First substrate, A first electrode disposed on the first substrate, A light conversion unit disposed on the first electrode, A second substrate disposed on the above-mentioned light conversion unit, A second electrode disposed between the second substrate and the light conversion unit, and It includes a barrier disposed on the upper surface of the second substrate, and A display device wherein the above barrier is provided in a plurality of places, and the plurality of barriers each extend in a first direction and are spaced apart from each other in a second direction that intersects the first direction.
19. In Article 18, A display device further comprising a polarizing film between the display panel and the optical path control member.
20. In Article 18, The light conversion unit comprises a light transmission unit and a light path variable unit around the light transmission unit, and the light path variable unit changes the path of light provided according to the application of voltage.

Description

Light path control member, and display device including same The present invention relates to an optical path control member and a display device including the same. Light-blocking films block the transmission of light from a light source and are attached to the front of display panels, which are display devices used in mobile phones, laptops, tablet PCs, in-car navigation systems, and automotive touch screens. They are used to adjust the viewing angle of light according to the angle of incidence when the display emits an image, thereby enabling the user to see clear image quality at the required viewing angle. In addition, light-blocking films can be used on vehicle or building windows to partially block external light to prevent glare or to prevent visibility from the outside to the inside. That is, the light-blocking film may be a light path conversion member that controls the path of light to block light in a specific direction and transmit light in a specific direction. Accordingly, the light transmission angle can be controlled by the light-blocking film, thereby controlling the user's viewing angle. FIG. 1 is a perspective view of an optical path control member according to one embodiment. Figure 2 is a cross-sectional view taken along the line I-I' of Figure 1. FIG. 3 is a cross-sectional view showing the second and third modes of the optical path control member of FIG. 1. Figure 4 is a schematic diagram showing the optical path in the first mode. Figure 5 is a schematic diagram showing the optical path in the second and third modes. Figure 6 is a graph showing the angle of incidence of light (S-polarized light) incident from the light-transmitting part to the optical path variable part and the reflectance due to the difference in refractive index between the light-transmitting part and the optical path variable part. Figure 7 is a graph showing the angle of incidence of light (P-polarized light) incident from the light-transmitting part to the optical path variable part and the reflectance due to the difference in refractive index between the light-transmitting part and the optical path variable part. FIGS. 8(a) and FIGS. 8(b) are drawings showing the frontal transmittance in the second mode and the first mode, respectively. FIG. 9 is a cross-sectional view of a light path control member in a first mode according to another embodiment. FIG. 10 is a cross-sectional view of the optical path control member in the second mode according to FIG. 9. FIG. 11 is a cross-sectional view of the optical path control member according to FIG. 9 in the third mode. FIG. 12 is a cross-sectional view of an optical path control member according to another embodiment. FIG. 13 is a cross-sectional view of an optical path control member according to another embodiment. FIG. 14 is a cross-sectional view of an optical path control member according to another embodiment. FIG. 15 is a cross-sectional view of an optical path control member according to another embodiment. FIG. 16 is a perspective view of a display device according to one embodiment. Figure 17 is a cross-sectional view taken along the line II-II' of Figure 16. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. When elements or layers are referred to as being "on" another element or layer, this includes cases where another layer or element is interposed directly on or in the middle of another element. Throughout the specification, the same reference numerals refer to the same components. Shapes, sizes, ratios, angles, numbers, etc., disclosed in the drawings for describing embodiments are exemplary and therefore the invention is not limited to the depicted details. Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may also be the second component within the technical scope of the present invention. The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship. Specific embodiments will be described below with