# US 12,222,536 B1 · Touchpad structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,222,536 B1 - Document ID: US12222536B1 - Status: Granted - Kind: B1 - Application number: 18/646,761 - Filed: 2024-04-26 - Granted: 2025-02-11 - Earliest claimed: 2024-03-20 - Applicants: LITE-ON Technology (Chang Zhou) Co., LTD.; LITE-ON Technology Corporation - Inventors: Ching-Lung Cheng; Yuan Du; Jen-Chieh Huang - Web page: https://patentgrep.com/patent/US12222536B1 ## CPC - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract The present disclosure is related to a touchpad structure, which includes a cover plate, a backlight unit, a touch circuit layer, a first optical modulation layer, and a second optical modulation layer. The first optical modulation layer is disposed between the cover plate and the backlight unit, and having a first reflectivity. The second optical modulation layer is disposed between the first optical modulation layer and the touch circuit layer. The second optical modulation layer has a second reflectivity and a first penetration rate, wherein the second reflectivity is the same as the first reflectivity, or the first reflectivity is the same as the first penetration rate. The touchpad structure can present a uniform color spectrum via the second optical modulation layer and the first optical modulation layer. ## Claims ### Claim 1 A touchpad structure, comprising: a cover plate; a backlight unit; a touch circuit layer; a first optical modulation layer, disposed between the cover plate and the backlight unit, and comprising a first reflectivity; and a second optical modulation layer, disposed between the first optical modulation layer and the touch circuit layer, and one side of the second optical modulation layer facing the touch circuit layer comprising a light shielding material, and defining a light penetration area, the second optical modulation layer having a second reflectivity and a first penetration rate; wherein the second reflectivity is the same as the first reflectivity, or the first reflectivity is the same as the first penetration rate. ### Claim 2 (depends on 1) The touchpad structure as claimed in claim 1, wherein the backlight unit comprises: a first light guiding film; a first light emitting unit, disposed on the touch circuit layer and disposed on one side of the first light guiding film; a second light emitting unit, disposed on the touch circuit layer and disposed on another side of the first light guiding film; and a reflective layer, disposed under the first light guiding film. ### Claim 3 (depends on 2) The touchpad structure as claimed in claim 2, wherein the backlight unit furthermore comprises: a translucent insulation layer, disposed on the first light guiding film, and comprising a bending part; and a second light guiding film, disposed on the translucent insulation layer; wherein the bending part is disposed between the first light guiding film and the second light emitting unit, and the translucent insulation layer covers the first light emitting unit along a direction which is perpendicular to the touch circuit layer. ### Claim 4 (depends on 2) The touchpad structure as claimed in claim 2, wherein the first light emitting unit and the second light emitting unit are covered by the light shielding material along a direction which is perpendicular to the touch circuit layer. ### Claim 5 (depends on 1) The touchpad structure as claimed in claim 1, wherein the backlight unit comprises: a first light guiding film; a reflective layer, disposed under the first light guiding film, and comprising a first hole; a first light emitting unit, disposed on the touch circuit layer, and disposed in the first hole; and a second light emitting unit, disposed on the touch circuit layer. ### Claim 6 (depends on 5) The touchpad structure as claimed in claim 5, wherein the backlight unit furthermore comprises: a translucent insulation layer, disposed on the first light guiding film, and comprising a bending part; a second light guiding film, disposed on the translucent insulation layer; and a first reflective atomization unit, disposed on one side of the translucent insulation layer facing the reflective layer; wherein the bending part is disposed between the first light guiding film and the second light emitting unit, and the first reflective atomization unit is corresponded to the first light emitting unit. ### Claim 7 (depends on 1) The touchpad structure as claimed in claim 1, wherein the backlight unit comprises: a first light guiding film; a reflective layer, disposed under the first light guiding film, and comprising a first hole and a second hole; a first light emitting unit, disposed on the touch circuit layer, and disposed in the first hole; and a second light emitting unit, disposed on the touch circuit layer, and disposed in the second hole. ### Claim 8 (depends on 7) The touchpad structure as claimed in claim 7, wherein the backlight unit comprises: a first reflective atomization unit, disposed on one side of the second optical modulation layer facing the reflective layer, and the first reflective atomization unit is corresponded to the first light emitting unit; and a second reflective atomization unit, disposed on one side of the second optical modulation layer facing the reflective layer, and the second reflective atomization unit is corresponded to the second light emitting unit. ### Claim 9 (depends on 7) The touchpad structure as claimed in claim 7, wherein the backlight unit comprises: a translucent insulation layer, disposed on the first light guiding film, and comprising a third hole; a second light guiding film, disposed on the translucent insulation layer; a first reflective atomization unit, disposed on one side of the second optical modulation layer facing the reflective layer, and the first reflective atomization unit is corresponded to the first light emitting unit; and a second reflective atomization unit, disposed on one side of the translucent insulation layer facing the reflective layer, and the second reflective atomization unit is corresponded to the second light emitting unit. ### Claim 10 (depends on 9) The touchpad structure as claimed in claim 9, wherein the first light emitting unit is disposed in the third hole. ### Claim 11 (depends on 1) The touchpad structure as claimed in claim 1, wherein the touch circuit layer is disposed between the cover plate and the backlight unit. ### Claim 12 (depends on 11) The touchpad structure as claimed in claim 11, wherein the backlight unit comprises: a first light guiding film; a reflective layer, disposed under the first light guiding film; a first light emitting unit, disposed on one side of the touch circuit layer away from the cover plate; and a second light emitting unit, disposed on one side of the touch circuit layer away from the cover plate, and disposed on an opposite side of the first light emitting unit. ### Claim 13 (depends on 1) The touchpad structure as claimed in claim 1, further comprising an adhesive layer disposed between the first optical modulation layer and the second optical modulation layer.