Touch display, liquid crystal display with a built-in touch

• US 8,952,929 B2
• Filed: 06/13/2013
• Issued: 02/10/2015
• Est. Priority Date: 02/26/2008
• Status: Active Grant

• Current Assignee: Wintek Corporation
• Original Assignee: Wintek Corporation
• Inventors: Kuo, Chien-Chung, Chi, Chun-Chi
• Primary Examiner(s): GIESY, ADAM
• Application Number:
  US13/916,598
• Publication Number:
  US 20130271411A1
• Time in Patent Office: 607 Days
• Field of Search: None
• US Class Current: 345/174
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/043 using propagating acoustic waves
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A liquid crystal display (LCD) with a built-in touch panel includes an LCD unit, a touch panel and a second polarized plate. The LCD unit includes a lower substrate, an upper substrate, a liquid crystal layer and a first polarized plate. The upper substrate is disposed opposite to the lower substrate, and the liquid crystal layer is disposed between the lower substrate and the upper substrate. The first polarized plate is disposed on the lower substrate and has a first polarized direction. The touch panel is disposed opposite to the LCD unit. The second polarized plate having a second polarized direction is disposed on the touch panel and located between the LCD unit and the touch panel. An intensity of a reflected light occurred in the LCD with the built-in touch panel is relatively low, so that good contrast and visibility are obtained.

Claims

1. A touch display, comprising:

a display unit, comprising a liquid crystal layer;

a touch panel, disposed opposite to the display unit;

a polarized plate, disposed on the touch panel and located between the display unit and the touch panel, wherein the polarized plate is preventing light reflection and there is no other polarizer disposed between the polarized plate and the liquid crystal layer;

a quarter-wavelength plate, disposed on the polarized plate and located between the polarized plate and the display unit; and

an airtight gasket, disposed between the display unit and the quarter-wavelength plate, wherein the airtight gasket surrounds a space between the quarter-wavelength plate and the display unit, and an air layer exists in the space.

2. A touch display, comprising:

a display unit, wherein the display unit is an organic light emitting display (OLED) or a plasma display panel (PDP);

a touch panel, disposed opposite to the display unit;

a polarized plate, disposed on the touch panel and located between the display unit and the touch panel, wherein the polarized plate is preventing light reflection and there is no other polarizer disposed between the polarized plate and the display unit;

a quarter-wavelength plate, disposed on the polarized plate and located between the polarized plate and the display unit; and

an airtight gasket, disposed between the display unit and the quarter-wavelength plate, wherein the airtight gasket surrounds a space between the quarter-wavelength plate and the display unit, and an air layer exists in the space.