Liquid crystal display comprising a touch panel and a bandpass filter

• US 8,218,109 B2
• Filed: 01/05/2009
• Issued: 07/10/2012
• Est. Priority Date: 06/24/2008
• Status: Expired due to Fees

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Chien, Shih-Che
• Primary Examiner(s): DUONG, THOI V
• Application Number:
  US12/348,414
• Publication Number:
  US 20090316087A1
• Time in Patent Office: 1,282 Days
• Field of Search: 349/12, 349/65, 349/106, 349/104, 345/175, 345/173
• US Class Current: 349/104
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters

Abstract

A liquid crystal display includes a first flat glass substrate, an opposite second flat glass substrate, a liquid crystal layer sandwiched therebetween, a backlight module disposed adjacent to the first flat glass substrate, a color filter disposed adjacent to the second flat glass substrate, a bandpass filter member disposed on the color filter. The bandpass filter member is configured for allowing light of a given spectrum emitted from the backlight module to pass therethrough and blocking light that is not in the given spectrum from passing therethrough, and a touch panel disposed adjacent to the bandpass filter member.

Claims

1. A liquid crystal display, comprising:

a first flat glass substrate, an opposite second flat glass substrate, and a liquid crystal layer sandwiched therebetween;

a backlight module disposed adjacent to the first flat glass substrate;

a color filter disposed adjacent to the second flat glass substrate;

a bandpass filter member disposed on the color filter, the bandpass filter member being configured for allowing light of a given spectrum emitted from the backlight module to pass therethrough, and blocking light emitted from the backlight module that is not in the given spectrum from passing therethrough; and

a touch panel disposed adjacent to the bandpass filter member;

wherein the bandpass filter member is further configured for allowing light of the given spectrum emitted from outside of the liquid crystal display to pass therethrough, and reflecting light emitted from outside of the liquid crystal display that is not in the given spectrum, such that when the backlight module is turned off, the light from outside of the liquid crystal display passes through the touch panel and reaches the bandpass filter member, and the bandpass filter member reflects the light that is not in the given spectrum so as to make the liquid crystal display achieve a mirror function.

2. The liquid crystal display as claimed in claim 1, wherein the bandpass filter member comprises a bandpass filter film including a number of alternately arranged first and second layers, and the bandpass filter film is proximate to the touch panel.

3. The liquid crystal display as claimed in claim 2, wherein the first layers are comprised of a first material, a refractive index of the first material is ranged from 2.1 to 2.5, the second layers are comprised of a second material, and a refractive index of the second material is ranged from 1.3 to 1.5.

4. The liquid crystal display as claimed in claim 3, wherein the first material is selected from a group consisting of Ta₂O₅, TiO₂, Ti₃O₅, and Nb₂O₅, and the second material is SiO₂.

5. The liquid crystal display as claimed in claim 1, wherein the bandpass filter member comprises a transparent substrate and a bandpass filter film formed on a surface of the transparent substrate, and the bandpass filter film is adjacent to the touch panel and includes a number of alternately arranged first and second layers.

6. The liquid crystal display as claimed in claim 5, wherein the first layers are comprised of a first material, a refractive index of the first material is ranged from 2.1 to 2.5, the second layers are comprised of a second material, and a refractive index of the second material is ranged from 1.3 to 1.5.

7. The liquid crystal display as claimed in claim 6, wherein the first material is selected from a group consisting of Ta₂O₅, TiO₂, Ti₃O₅, and Nb₂O₅, and the second material is SiO₂.

8. The liquid crystal display as claimed in claim 1, further comprising a transflective layer disposed between the first flat glass substrate and the backlight module, the transflective layer including a number of alternately arranged reflecting regions and transmitting regions.

9. A liquid crystal display, comprising:

a first flat glass substrate, an opposite second flat glass substrate, and a liquid crystal layer sandwiched therebetween;

a backlight module disposed adjacent to the first flat glass substrate;

a color filter disposed adjacent to the second flat glass substrate;

a bandpass filter member disposed on the color filter, the bandpass filter member being configured for allowing light of a given spectrum emitted from the backlight module to pass therethrough, and blocking light emitted from the backlight module that is not in the given spectrum from passing therethrough; and

a touch panel disposed adjacent to the bandpass filter member;

wherein the bandpass filter member is capable of reflecting external light that is not in the given spectrum, and allowing external light that is in the given spectrum to pass therethrough, such that when no light is emitted from the backlight module, the external light passes through the touch panel and reaches the bandpass filter member, and the bandpass filter member reflects the external light that is not in the given spectrum, so that the liquid crystal display achieves a mirror function.

10. The liquid crystal display of claim 9, wherein the bandpass filter member comprises a bandpass filter film formed by a number of alternately arranged first and second layers, and the bandpass filter film is directly formed on a surface of the color filter that is away from the liquid crystal layer.

11. The liquid crystal display of claim 10, wherein the first layers are comprised of a first material, a refractive index of the first material is ranged from 2.1 to 2.5, the second layers are comprised of a second material, and a refractive index of the second material is ranged from 1.3 to 1.5.

12. The liquid crystal display of claim 9, wherein the bandpass filter member comprises a bandpass filter film and a transparent plate, the transparent plate is formed on a surface of the color filter that is away from the liquid crystal layer, and the bandpass filter film is formed on the transparent plate.

13. The liquid crystal display of claim 12, wherein the first layers are comprised of a first material, a refractive index of the first material is ranged from 2.1 to 2.5, the second layers are comprised of a second material, and a refractive index of the second material is ranged from 1.3 to 1.5.