Liquid Crystal Display Device with Touch Screen Function

• US 20100134448A1
• Filed: 10/06/2009
• Published: 06/03/2010
• Est. Priority Date: 12/03/2008
• Status: Active Grant

• Current Assignee: Hydis Technology Company Limited (E Ink Holdings Incorporated)
• Original Assignee: Hydis Technology Company Limited (E Ink Holdings Incorporated)
• Inventors: Kim, Min Cheol, Park, Jun Baek
• Granted Patent: US 9,207,796 B2
• Time in Patent Office: Days
• US Class Current: 345/176
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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) device with a touch screen function is provided. The LCD device includes a liquid crystal panel layer including a liquid crystal layer filled between first and second substrates, and a touch panel layer which is formed on the first substrate, includes at least one phase compensating means stacked therein, and detects a contact point when an upper electrode and a lower electrode come into contact with each other due to external pressure, wherein the phase compensating means is patterned so that the upper electrode and the lower electrode are able to contact each other, and thus outdoor visibility and viewing angle characteristics can be effectively improved.

Claims

1. A liquid crystal display (LCD) device with a touch screen function, comprising:

a liquid crystal panel layer including a liquid crystal layer filled between first and second substrates; and

a touch panel layer which is formed on the first substrate, includes at least one phase compensating means stacked therein, and detects a contact point when an upper electrode and a lower electrode come into contact with each other due to external pressure,

wherein the phase compensating means is patterned so that the upper electrode and the lower electrode are able to contact each other.

2. The LCD device of claim 1, wherein the first substrate functions as a lower substrate of the touch panel layer.

3. The LCD device of claim 1, wherein the touch panel layer further includes a polarization means which is formed therein and patterned identically to a pattern of the phase compensating means.

4. The LCD device of claim 1, wherein the phase compensating means includes at least one of an A plate, a C plate, A and C plates, a λ

/4 phase retardation film, and a λ

/2 phase retardation film.

5. The LCD device of claim 4, wherein when the phase compensating means is formed of the A and C plates, a polarizer is formed below the second substrate, and the polarizer includes a polymer polarization medium layer for polarizing incident light and an ORT protection layer formed on a top surface of the polymer polarization medium layer.

6. The LCD device of claim 1, wherein a protection layer patterned identically to a pattern of the phase compensating means is further formed on or below the phase compensating means.

7. The LCD device of claim 1, wherein the phase compensating means is patterned to be formed at a location corresponding to a pixel area of the liquid crystal panel layer.

8. A liquid crystal display (LCD) device, comprising:

a liquid crystal panel layer including a liquid crystal layer filled between first and second substrates; and

a touch panel layer which is formed on the first substrate, includes a polarization means stacked therein, and detects a contact point when an upper electrode and a lower electrode come into contact with each other due to external pressure,

wherein the polarization means is patterned so that the upper electrode and the lower electrode are able to contact each other.

9. The LCD device of claim 8, wherein the first substrate functions as a lower substrate of the touch panel layer.

10. The LCD device of claim 8, wherein the polarization means is formed at a location corresponding to a pixel area of the liquid crystal panel layer.

11. The LCD device of claim 8, wherein a protection layer patterned identically to a pattern of the polarization means is further formed on or below the polarization means.