Handwriting input apparatus

• US 7,663,608 B2
• Filed: 11/16/2005
• Issued: 02/16/2010
• Est. Priority Date: 11/19/2004
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Liao, Chen-Hsien, Sui, Shou-Ling
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): Abdin; Shaheda A
• Application Number:
  US11/274,163
• Publication Number:
  US 20060109260A1
• Time in Patent Office: 1,553 Days
• Field of Search: 345/156, 345/57, 345/173, 382/313, 178/18.01, 178/18.03
• US Class Current: 345/173
• CPC Class Codes: G06F 3/03542 Light pens for emitting or receiving light
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A handwriting input apparatus comprises a position-encoding layer and a pen. The position-encoding layer comprises a plurality of position-encoding pattern. The position-encoding layer is transparent to visible light and is reflective to light of predetermined wavelengths. Each position-encoding pattern represents a specific code. The pen has a projector and a camera at one end. The projector is adapted to generate a light beam of the predetermined wavelengths toward the position-encoding layer. The camera is adapted to capture images of the plurality of position-encoding pattern.

Claims

1. A LCD panel with handwriting input apparatus comprising:

a first substrate;

a plurality of position-encoding pattern disposed on a bottom surface of the first substrate, the position-encoding patterns being transparent to visible light and being reflective to light of predetermined wavelengths, each position-encoding pattern representing a specific code and having a multi-layer structure including alternate low-refractive-index layers formed of Mb2O5 and high-refractive-index layers formed of SiO2;

a black matrix disposed on the bottom surface of the first substrate, wherein each position-encoding pattern is interposed between the black matrix and the first substrate and is completely covered by the black matrix;

a color filter layer disposed on the bottom surface of the first substrate;

a second substrate formed with thin-film transistors and pixel electrodes thereon, disposed beneath the first substrate and the color filter layer; and

a liquid crystal layer interposed between the first substrate and the second substrate, thereby a pen having a projector and a camera at one end thereof is adapted to generate a light beam of the predetermined wavelengths through the first substrate toward the plurality of position-encoding pattern and the camera is adapted to capture images of the plurality of position-encoding pattern.

2. The LCD panel according to claim 1, wherein the bottom surface of the first substrate is formed with a roughness surface.

3. The LCD panel according to claim 1, wherein a part of the bottom surface of the first substrate is formed with a roughness surface for disposing the position-encoding patterns.

4. The LCD panel according to claim 1, further comprising a common electrode formed on the color filter layer and the black matrix.

5. The LCD panel according to claim 1, wherein the color filter layer includes red filters, green filters and blue filters, and each of the red filters, the green filters and the blue filters is separated with each other by the black matrix.

6. A LCD panel with handwriting input apparatus comprising:

a first substrate;

a plurality of position-encoding pattern disposed on a bottom surface of the first substrate, the position-encoding patterns being transparent to visible light and being reflective to light of predetermined wavelengths, each position-encoding pattern representing a specific code and having a multi-layer structure including alternate low-refractive-index layers formed of Mb2O5 and high-refractive-index layers formed of SiO2;

a black matrix disposed on the bottom surface of the first substrate, wherein a part of the position-encoding patterns are interposed between the black matrix and the first substrate and the other part of the position-encoding patterns are interposed between the color filter layer and the first substrate;

a color filter layer disposed on the bottom surface of the first substrate;

a second substrate formed with thin-film transistors and pixel electrodes thereon, disposed beneath the first substrate and the color filter layer; and

a liquid crystal layer interposed between the first substrate and the second substrate, thereby a pen having a projector and a camera at one end thereof is adapted to generate a light beam of the predetermined wavelengths through the first substrate toward the plurality of position-encoding pattern and the camera is adapted to capture images of the plurality of position-encoding pattern.