# US 2024/0201558 A1 · Light path control member, display device including same, and method for manufacturing light path control member > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0201558 A1 - Document ID: US20240201558A1 - Status: Published application - Kind: A1 - Application number: 18/518,330 - Filed: 2023-11-22 - Published: 2024-06-20 - Earliest claimed: 2022-12-19 - Assignees: LG Display Co., Ltd. - Applicants: LG Display Co., Ltd. - Inventors: Junehwan KIM; Jungim HWANG - Web page: https://patentgrep.com/patent/US20240201558A1 ## CPC - G02F 1/29: for the control of the position or the direction of light beams, i.e. deflection - G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## 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 electrode disposed on the light conversion unit; and a second substrate disposed on the second electrode. The light conversion unit includes a light transmitting part, a high reflective part around the light transmitting part, and a transmittance variable part between the light transmitting part and the high reflective part. The light transmittance of the transmittance variable part is changed based on the voltage applied. ## Claims ### Claim 1 A light path control member, comprising: a first substrate; a first electrode disposed on the first substrate; a light conversion unit disposed on the first electrode, the light conversion unit including: a light transmitting part, a high reflective part adjacent to the light transmitting part, and a transmittance variable part between the light transmitting part and the high reflective part; a second electrode disposed on the light conversion unit; and a second substrate disposed on the second electrode, wherein light transmittance of the transmittance variable part is changed based on voltage. ### Claim 2 (depends on 1) The light path control member of claim 1, wherein the light conversion unit is disposed between the first electrode and the second electrode. ### Claim 3 (depends on 1) The light path control member of claim 1, wherein a reflective index of the high reflective part is greater than a reflective index of the light transmitting part. ### Claim 4 (depends on 1) The light path control member of claim 1, wherein the transmittance variable part includes a dispersion solution and light absorbing particles in the dispersion solution. ### Claim 5 (depends on 4) The light path control member of claim 4, wherein in a first mode, the light absorbing particles are dispersed in the dispersion solution, wherein in the first mode, the transmittance variable part blocks light incident by dispersion of the light absorbing particles. ### Claim 6 (depends on 5) The light path control member of claim 5, wherein in the first mode, no voltage is applied to each of the first electrode and the second electrode. ### Claim 7 (depends on 6) The light path control member of claim 6, wherein in a second mode, an alignment direction of the light absorbing particles are changed. ### Claim 8 (depends on 7) The light path control member of claim 7, wherein in the second mode, the voltage of a first polarity is applied to the first electrode, and the voltage of a second polarity different from the first polarity is applied to the second electrode. ### Claim 9 (depends on 8) The light path control member of claim 8, wherein the alignment direction of the light absorbing particles of the transmittance variable part is changed according to a magnetic field formed by the first electrode and the second electrode. ### Claim 10 (depends on 9) The light path control member of claim 9, wherein the transmittance variable part is variable in transmittance according to the alignment direction of the light absorbing particles. ### Claim 11 (depends on 8) The light path control member of claim 8, wherein a refractive index of the dispersion solution is smaller than a refractive index of the high refractive part and greater than a refractive index of the light transmitting part. ### Claim 12 (depends on 1) The light path control member of claim 1, wherein an opening extending from an upper surface in a thickness direction is formed in the light transmission part, and the transmittance variable part is disposed within the opening. ### Claim 13 A method for manufacturing a light path control member, the method comprising: disposing a first electrode on a first substrate; forming a light alignment polymer material layer on the first electrode; forming a plurality of openings from a surface of the light alignment polymer material layer; forming a high refractive part around the light alignment polymer material layer from the light alignment polymer material layer; disposing a transmittance variable part in the openings; disposing a second electrode on the transmittance variable part, the high refractive part, and the light alignment polymer material layer; and disposing a second substrate on the second electrode, wherein the transmittance variable part is disposed between the light alignment polymer material layer and the high reflective part, wherein light transmittance of the transmittance variable part is changed based on voltage. ### Claim 14 (depends on 13) The method of claim 13, wherein forming the high reflective part around the light alignment polymer material layer includes: disposing a mask on an area that does not overlap with the high refractive part on the light alignment polymer material layer and irradiating light to an exposed area using the mask. ### Claim 15 (depends on 14) The method of claim 14, wherein forming the high refractive part around the light alignment polymer material layer further includes: after the step of irradiating the light to the exposed area using the mask, curing the light alignment polymer material layer and the high refractive part. ### Claim 16 (depends on 13) The method of claim 13, wherein in forming the high refractive part around the light alignment polymer material layer, an area other than the high refractive part formed from the light alignment polymer material layer includes the light transmitting part, and each of the light transmitting part, the high refractive part, and the transmittance variable part is disposed between the first electrode and the second electrode. ### Claim 17 (depends on 16) The method of claim 16, wherein a reflective index of the high reflective part is greater than a reflective index of the light transmitting part. ### Claim 18 A display device, comprising: a display panel; and a light path control member on the display panel, wherein the light path control member comprises: a first substrate; a first electrode disposed on the first substrate; a light conversion unit disposed on the first electrode, the light conversion unit including: a light transmitting part, a high reflective part around the light transmitting part, and a transmittance variable part between the light transmitting part and the high reflective part; a second electrode disposed on the light conversion unit; and a second substrate disposed on the second electrode, wherein light transmittance of the transmittance variable part is changed based on voltage. ### Claim 19 (depends on 18) The display device of claim 18, wherein the light conversion unit is disposed between the first electrode and the second electrode. ### Claim 20 (depends on 18) The display device of claim 18, wherein a reflective index of the high reflective part is greater than a reflective index of the light transmitting part.