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

• US 8,508,496 B2
• Filed: 02/26/2009
• Issued: 08/13/2013
• 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:
  US12/393,047
• Publication Number:
  US 20090213092A1
• Time in Patent Office: 1,629 Days
• Field of Search: 345/173, 345/174, 345/87
• 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 liquid crystal display (LCD) with a built-in touch panel, comprising:

an LCD unit, comprising;

a lower substrate;

an upper substrate, disposed opposite to the lower substrate;

a liquid crystal layer, disposed between the lower substrate and the upper substrate;

a first polarized plate, disposed on the lower substrate;

a touch panel, disposed opposite to the upper substrate;

a second polarized plate, disposed at a side of the touch panel facing to the LCD unit, and located between the LCD unit and the touch panel; and

an air layer configured between the upper substrate and the second polarized plate and an airtight gasket disposed at a periphery of the air layer surrounding the air layer,

wherein the first polarized plate and the second polarized plate are the only polarizing plates in the liquid crystal display (LCD) with a built-in touch panel,

the first polarized plate has a first polarized direction, and the second polarized plate has a second polarized direction, and the first polarized direction is matched with the second polarized direction for displaying an image and preventing light reflection.

2. The LCD with a built-in touch panel as claimed in claim 1, further comprising:

a quarter-wavelength plate, disposed on the second polarized plate and located between the second polarized plate and the LCD unit.

3. The LCD with a built-in touch panel as claimed in claim 1, further comprising:

a common electrode layer, disposed on the upper substrate and located between the upper substrate and the liquid crystal layer; and

a color filter array layer, disposed on the upper substrate and located between the upper substrate and the common electrode layer.

4. The LCD with a built-in touch panel as claimed in claim 1, further comprising:

an active device array, disposed on the lower substrate.

5. The LCD with a built-in touch panel as claimed in claim 1, wherein the touch panel comprises a resistive touch panel, a capacitive touch panel, an ultrasonic touch panel or an optical touch panel.

6. The LCD with a built-in touch panel as claimed in claim 1, wherein the touch panel comprises:

a first substrate;

a first electrode pattern, disposed on the first substrate;

a second substrate, disposed opposite to the first substrate;

a second electrode pattern, disposed on the second substrate; and

a dielectric layer, disposed between the first electrode pattern and the second electrode pattern.

7. A touch display, comprising:

a display unit, comprising a first polarized plate;

a touch panel, disposed opposite to the display unit, and

a second polarized plate, disposed on the touch panel and located between the display unit and the touch panel, and disposed at a side of the touch panel facing to the display unit; and

an air layer configured between the display unit and the second polarized plate and an airtight gasket disposed at a periphery of the air layer surrounding the air layer;

wherein the first polarized plate and the second polarized plate are the only polarizing plates in the display unit with a built-in touch panel,

the first polarized plate has a first polarized direction, and the second polarized plate has a second polarized direction, and the first polarized direction is matched with the second polarized direction for displaying an image and preventing light reflection.

8. The touch display as claimed in claim 7, further comprising:

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