# US 2013/0155025 A1 · Optical touch device and light source assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155025 A1 - Document ID: US20130155025A1 - Status: Published application - Kind: A1 - Application number: 13/473,582 - Filed: 2012-05-16 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Assignees: Pixart Imaging Inc. - Inventors: Hung-Ching Lai; Hui-Hsuan Chen; Chi-Chieh Liao - Web page: https://patentgrep.com/patent/US20130155025A1 ## CPC - G06F 3/0428: {by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual (sensing beam interruptions in a planar beam grid of an optical touch-screen G06F3/0421)} - G02B 5/045: {Prism arrays} - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - G02B 5/04: Prisms - G06F 3/042: by opto-electronic means - G06F 3/0421: {by interrupting or reflecting a light beam, e.g. optical touch-screen} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An optical touch device includes a sensing area, a first linear light source disposed next to a first side of the sensing area, a light penetration and reflection component disposed between the first linear light source and the first side, and a light sensing component configured to have a field of view of the entire sensing area. The light penetration and reflection component includes a substrate and a light penetration and reflection structure disposed on the substrate. The light penetration and reflection structure includes a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and light penetration regions. The prism pillars each are configured to have a length direction parallel to the first side. Each prime pillar has at least a reflection surface. The reflection surfaces are included in the reflection regions. ## Claims ### Claim 1 An optical touch device, comprising: a sensing area; a first linear light source disposed next to a first side of the sensing area; a light penetration and reflection component disposed between the first linear light source and the first side, the light penetration and reflection component comprising a substrate and a light penetration and reflection structure disposed on the substrate, the light penetration and reflection structure comprising a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and a plurality of light penetration regions, the prism pillars each being configured to have a length direction parallel to the first side, each prime pillar comprising at least a reflection surface, the reflection surfaces being included in the reflection regions; and a light sensing component configured to have a field of view of the entire sensing area. ### Claim 2 (depends on 1) The optical touch device according to claim 1, wherein each prism pillar comprises two reflection surfaces configured to be titled and connected to each other, each adjacent two prime pillars are configured to have a gap therebetween, and the gaps are included in the light penetration regions. ### Claim 3 (depends on 1) The optical touch device according to claim 1, wherein each prism pillar comprises two reflection surfaces, configured to be titled to each other, and a light penetration portion, configured to be connected between the two reflection surfaces, the light penetration portions are included in the light penetration regions. ### Claim 4 (depends on 3) The optical touch device according to claim 3, wherein the light penetration portion is configured to have a curve or a flat structure. ### Claim 5 (depends on 3) The optical touch device according to claim 3, wherein each adjacent two prime pillars are configured to be connected to each other. ### Claim 6 (depends on 5) The optical touch device according to claim 5, wherein one of the light penetration portions is configured to have an orthogonal projection area A1 on the surface of the substrate, the prism pillar is configured to have an area A2 on the surface of the substrate, and 1/20≦A1/A2≦⅕. ### Claim 7 (depends on 3) The optical touch device according to claim 3, wherein each adjacent two prime pillars are configured to have a gap therebetween, the gaps are included in the light penetration regions. ### Claim 8 (depends on 7) The optical touch device according to claim 7, wherein one of the light penetration portions is configured to have an orthogonal projection area A1 on the surface of the substrate, the prism pillar is configured to have an area A2 on the surface of the substrate, the gap is configured to have an area of A3, and 1/20≦(A1/A3)/A2≦⅕. ### Claim 9 (depends on 1) The optical touch device according to claim 1, wherein each prism pillar is configured to have a plurality of V-shaped grooves disposed on a top surface thereof opposite to the first leaner light source, each V-shaped groove is configured to have two groove walls, the groove walls of the V-shaped grooves are included in the reflection surfaces, the light penetration and reflection structure further comprises a plurality of platforms configured to protrude from the surface of the substrate opposite to the linear light source, the platforms and the prism pillars are arranged alternately, the platforms are included in the light penetration regions. ### Claim 10 (depends on 1) The optical touch device according to claim 1, wherein the light penetration and reflection structure is formed in a central area of the surface of the substrate. ### Claim 11 (depends on 1) The optical touch device according to claim 1, further comprising a second linear light source disposed next to a second side of the sensing area, wherein the second side is configured to be opposite to the first side. ### Claim 12 (depends on 11) The optical touch device according to claim 11, further comprising: a third linear light source disposed next to a third side of the sensing area, the third side being configured to be connected between the first and second sides, the light sensing component being disposed in a connection area of the second and third sides; and a mirror disposed next to a fourth side of the sensing area, wherein the fourth side is configured to be opposite to the third side. ### Claim 13 (depends on 1) The optical touch device according to claim 1, further comprising a display panel, the sensing area is formed on a display surface of the display panel. ### Claim 14 (depends on 1) The optical touch device according to claim 1, further comprising a plate, on which the sensing area is formed. ### Claim 15 A light source assembly of an optical touch device, comprising: a linear light source disposed next to a side of a sensing area of the optical touch device; and a light penetration and reflection component disposed between the first linear light source and the side, the light penetration and reflection component comprising a substrate and a light penetration and reflection structure disposed on the substrate, the light penetration and reflection structure comprising a plurality of prime pillars protruding from a surface, opposite to the first linear light source, of the substrate and thereby forming a plurality of reflection regions and a plurality of light penetration regions, the prism pillars each being configured to have a length direction parallel to the side, each prime pillar comprising at least a reflection surface, the reflection surfaces being included in the reflection regions. ### Claim 16 A light source assembly of an optical touch device, comprising: a linear light source disposed next to a side of a sensing area of the optical touch device; and a light penetration and reflection component disposed between the linear light source and the side, the light penetration and reflection component comprising a plurality of optical micro-structures, each optical micro-structure comprising a top portion, a bottom portion and at least a reflection surface, the top portion being configured to be opposite to the linear light source, the reflection surface(s) being configured to be connected between the top portion and the bottom portion, at least one of the top portion and the bottom portion comprising a flat region, each reflection surface being configured to be titled relative to the flat region(s). ### Claim 17 (depends on 16) The light source assembly of an optical touch device according to claim 16, wherein the optical micro-structure is a triangular pillar, a trapezoidal pillar, or a combination of the triangular pillar and the trapezoidal pillar. ### Claim 18 (depends on 16) The light source assembly of an optical touch device according to claim 16, wherein the bottom portion of each optical micro-structure is the flat region, the top portion comprises a plurality of V-shaped grooves, each V-shaped groove is configured to have two groove walls, and the groove walls of the V-shaped grooves are the reflection surface. ### Claim 19 (depends on 16) The light source assembly of an optical touch device according to claim 16, wherein the linear light source comprises a light guide strip, the top portions of the optical micro-structures is configured to be connected to the light guide strip. ### Claim 20 (depends on 16) The light source assembly of an optical touch device according to claim 16, wherein each adjacent two optical micro-structures are configured to be connected to each other. ### Claim 21 (depends on 16) The light source assembly of an optical touch device according to claim 16, wherein each adjacent two optical micro-structures are configured to have a distance therebetween.