LIQUID CRYSTAL DISPLAYS AND THE DISPLAY METHODS THEREOF

• US 20170199423A1
• Filed: 12/18/2015
• Published: 07/13/2017
• Est. Priority Date: 11/27/2015
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: CHENG, Yan
• Granted Patent: US 9,817,267 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0026 Wavelength selective element, sheet or layer, e.g. filter or grating
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0056 for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133616 Front illuminating devices
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials

Abstract

A LCD and the display method thereof are disclosed. The LCD includes a light guiding plate, a light source, a QD media layer, a first polarizer, and an advanced polarization conversion film (APCF). The QD media layer is arranged between the light source and the first polarizer, the first polarizer and the APCF are arranged between the QD media layer and the light guiding plate. The light beams emitted from the light source pass through the QD media layer and activate the QD media layer to emit lights In this way, the brightness of the reflective LCD may be enhanced.

Claims

1. A liquid crystal display (LCD), comprising:

a light guiding plate, a light source arranged at a light incident side of the light guiding plate, a quantum dot (QD) media layer, a first polarizer, and an advanced polarization conversion film (APCF) arranged on a surface of the first polarizer facing away the light guiding plate, the QD media layer is arranged between the light source and the first polarizer, the first polarizer and the APCF are arranged between the QD media layer and the light guiding plate;

the light beams emitted from the light source pass through the QD media layer and activate the QD media layer to emit lights, a portion of the light beams from the QD media layer pass through the APCF and the first polarizer to generate the polarized beams entering the light guiding plate, the other portion of the light beams are reflected by the APCF to arrive the QD media layer, and activate the QD media layer to emit lights; and

a second polarizer arranged on an non-light-emitting-surface of the light guiding plate, a first substrate arranged on a light emitting surface of the light guiding plate, a second substrate opposite to the first substrate, a liquid crystal layer between the first substrate and the second substrate, and a reflective sheet arranged on a surface of the second substrate facing toward the liquid crystal layer, the non-light-emitting-surface is parallel to the light emitting surface, the light beams from the light guiding plate emit out from the light emitting surface, pass through the liquid crystal layer, and are reflected back toward the light guiding plate by the reflective sheet, most of the reflected light beams pass through the second polarizer and enter human eyes, a small portion of the reflected light beams are absorbed by the second polarizer, and the light beams emitted from the light source are blue light, and the blue light activate the QD media layer to emit white light.

2. The LCD as claimed in claim 1, wherein the QD media layer comprises media and QD dots arranged on the media.

3. The LCD as claimed in claim 1, wherein the LCD further comprises a wave-phase-difference film arranged on a surface of the second polarizer facing away the light guiding plate.

4. The LCD as claimed in claim 1, wherein the first substrate is a color film substrate, and the second substrate is a thin film transistor (TFT) array substrate.

5. A LCD, comprising:

a light guiding plate, a light source arranged at a light incident side of the light guiding plate, a quantum dot (QD) media layer, a first polarizer, and an advanced polarization conversion film (APCF) arranged on a surface of the first polarizer facing away the light guiding plate, the QD media layer is arranged between the light source and the first polarizer, the first polarizer and the APCF are arranged between the QD media layer and the light guiding plate; and

the light beams emitted from the light source pass through the QD media layer and activate the QD media layer to emit lights, a portion of the light beams from the QD media layer pass through the APCF and the first polarizer to generate the polarized beams entering the light guiding plate, the other portion of the light beams are reflected by the APCF to arrive the QD media layer, and activate the QD media layer to emit lights.

6. The LCD as claimed in claim 5, wherein the LCD further comprises a second polarizer arranged on an non-light-emitting-surface of the light guiding plate, a first substrate arranged on a light emitting surface of the light guiding plate, a second substrate opposite to the first substrate, a liquid crystal layer between the first substrate and the second substrate, and a reflective sheet arranged on a surface of the second substrate facing toward the liquid crystal layer, the non-light-emitting-surface is parallel to the light emitting surface, the light beams from the light guiding plate emit out from the light emitting surface, pass through the liquid crystal layer, and are reflected back toward the light guiding plate by the reflective sheet, most of the reflected light beams pass through the second polarizer and enter human eyes, a small portion of the reflected light beams are absorbed by the second polarizer.

7. The LCD as claimed in claim 5, wherein the QD media layer comprises media and QD dots arranged on the media.

8. The LCD as claimed in claim 5, wherein the light beams emitted from the light source are blue light, and the blue light activate the QD media layer to emit white light.

9. The LCD as claimed in claim 6, wherein the LCD further comprises a wave-phase-difference film arranged on a surface of the second polarizer facing away the light guiding plate.

10. The LCD as claimed in claim 6, wherein the first substrate is a color film substrate, and the second substrate is a thin film transistor (TFT) array substrate.

11. A display method of LCDs, comprising:

radiating a QD media layer by light beams emitted from a light source to activate the QD media layer so as to emit lights;

controlling a first polarizer and an advanced polarization conversion film (APCF) between a light guiding plate and the QD media layer such that a portion of the light beams emitted from the QD media layer pass through the APCF and the first polarizer to generate the polarized beams entering the light guiding plate, and the other portion of the light beams are reflected by the APCF to arrive the QD media layer so as to activate the QD media layer to emit lights.

12. The display method as claimed in claim 11, wherein the LCD further comprises a first substrate arranged on a light emitting surface of the light guiding plate, a second substrate opposite to the first substrate, a liquid crystal layer between the first substrate and the second substrate, and a reflective sheet arranged on a surface of the second substrate facing toward the liquid crystal layer, the method further comprises:

the light beams emitted from the light emitting surface of the light guiding plate and passing through the liquid crystal layer are reflected back to the light guiding plate by the reflective sheet;

controlling the second polarizer arranged on the non-light-emitting-surface of the light guiding plate such that most of the light beams reflected by the reflective sheet pass through the second polarizer and enter human eyes, a small portion of the reflected light beams are absorbed by the second polarizer; and

wherein the light emitting surface is parallel to the non-light-emitting-surface.

13. The display method as claimed in claim 12, wherein the method further comprises:

when the LCD is in a dark state, the second polarizer on the non-light-emitting-surface of the light guiding plate absorbs the leaked light beams from the light guiding plate.

14. The display method as claimed in claim 11, wherein the light beams emitted from the light source are blue light, and the blue light activate the QD media layer to emit white light.