LIQUID CRYSTAL DISPLAY WITH PHOTO-LUMINESCENT MATERIAL LAYER

• US 20140204128A1
• Filed: 01/18/2013
• Published: 07/24/2014
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Jiang, Jun
• Granted Patent: US 9,361,856 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G02F 1/13318 Circuits comprising a photodetector
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

In one embodiment, a method for controlling a liquid crystal display (LCD) is provided. The method receives a first light from a light source structure at a light emitting layer and emits from the light emitting layer a first color component, a second color component, and a third color component. The method then receives a second light through a first polarizer layer of a first polarization state positioned above the light emitting layer, a liquid crystal layer positioned above the first polarizer layer, and a second polarizer layer of a second polarization state positioned above the liquid crystal layer and converts the second light into the first color component, the second component, and the third color component in the light emitting layer. An intensity of the first light is dynamically controlled based on the converting of the second light.

Claims

1. A method for controlling a liquid crystal display (LCD), the method comprising:

receiving a first light from a light source structure at a light emitting layer that includes a photo-luminescent material that emits light with different wavelengths upon excitation by the first light;

emitting from the light emitting layer a first color component based on receiving the first light, a second color component based on receiving the first light, and a third color component based on receiving the first light;

receiving a second light through a first polarizer layer of a first polarization state positioned above the light emitting layer, a liquid crystal layer positioned above the first polarizer layer, and a second polarizer layer of a second polarization state positioned above the liquid crystal layer;

converting the second light into the first color component, the second component, and the third color component in the light emitting layer; and

dynamically controlling an intensity of the first light based on the converting of the second light.

2. The method of claim 1, further comprising adjusting at least one of the first color component, the second component, and the third color component being emitted by the light emitting layer based on the second light being converted into the first color component, the second component, and the third color component.

3. The method of claim 2, wherein adjusting further comprises using a look up table to determine an amount of adjustment for the at least one of the first color component, the second component, and the third color component being emitted by the light emitting layer based on the second light being converted into the first color component, the second component, and the third color component.

4. The method of claim 1, wherein controlling the intensity comprises controlling the light source structure to adjust the light emitted by the light source structure based on the second light being converted into the first color component, the second component, and the third color component.

5. The method of claim 4, wherein controlling the intensity further comprises using a look up table to determine an intensity for the light emitted by the light source structure.

6. The method of claim 1, wherein controlling the intensity comprises dynamically adjusting between a transmissive mode, a reflective mode, and a transflective mode, wherein:

the transmissive mode is when the first light source is in an ON state,

the reflective mode is when the first light source is in an OFF state and the second light is converted into the first color component, the second component, and the third color component in the light emitting layer, and

the transflective mode is when the first light source is in an ON state and the second light is converted into the first color component, the second component, and the third color component in the light emitting layer.

7. The method of claim 1, wherein the photo-luminescent material of the light emitting layer includes quantum dot cells or a photo-luminescent phosphor material.

8. An apparatus comprising:

a light source structure configured to emit a light;

a light emitting layer including a photo-luminescent material that emits light with different wavelengths upon excitation by the light emitted by the light source structure, wherein a first portion of the photo-luminescent material emits a first color component based on receiving the light, a second portion of photo-luminescent material emits a second color component based on receiving the light, and a third portion of the photo-luminescent material emits a third color component based on receiving the light;

a first polarizer layer of a first polarization state positioned above the light emitting layer;

a bottom glass;

a liquid crystal layer positioned above the first polarizer layer;

a top glass; and

a second polarizer layer of a second polarization state positioned at a top surface of the top glass, wherein a distance between the light emitting layer and the liquid crystal layer is based on a desired angle of emission for the first color component, the second color component, and the third color component being emitted from the light emitting layer and a width of a pixel in the liquid crystal layer.

9. The apparatus of claim 8, wherein the light emitting layer is positioned above the bottom glass and below the first polarizer layer.

10. The apparatus of claim 8, wherein the light emitting layer is positioned below the bottom glass and below the first polarizer layer.

11. The apparatus of claim 8, wherein the light source structure comprises:

an external light source configured to emit the light; and

a light guide panel configured to receive the light and direct the light to the light emitting layer.

12. The apparatus of claim 8, wherein the distance comprises a depth of the bottom glass and a depth of the first polarizer layer when the bottom glass and the first polarizer layer are in between the light emitting layer and the liquid crystal layer.

13. The apparatus of claim 12, wherein the distance comprises a depth of the first polarizer layer when the first polarizer layer is in between the light emitting layer and the liquid crystal layer.

14. The apparatus of claim 8, wherein:

the light source structure emits a blue light,

the first portion of the photo-luminescent material emits the first color component based on receiving the light and absorbs the second color component and the third color component,

the second portion of the photo-luminescent material emits the second color component based on receiving the light and absorbs the first color component and the third color component, and

the third portion of the photo-luminescent material emits the third color component by passing the received light.

15. The apparatus of claim 8, wherein the photo-luminescent material of the light emitting layer includes quantum dot cells or a photo-luminescent phosphor material.

16. The apparatus of claim 8, wherein when the liquid crystal layer is in the ON state, the light emitting layer is controlled to adjust at least one of the first color component, the second component, and the third color component emitted based on the ambient light being converted into the first color component, the second component, and the third color component.

17. The apparatus of claim 16, wherein the light emitting layer is controlled based on a look up table (LUT) and an amount of ambient light being converted into the first color component, the second component, and the third color component.

18. The apparatus of claim 8, wherein when the liquid crystal layer is in the ON state, the light source structure is controlled to adjust the light emitted by the light source structure based on the ambient light being converted into the first color component, the second component, and the third color component.

19. The apparatus of claim 8, wherein the first color component, the second component, and the third color component is emitted from the apparatus without passing through a color filter.

20. The apparatus of claim 8, further comprising a color filter including a first portion configured to pass the first color component and the third color component, a second portion configured to pass the second color component and the third color component, a third portion configured to pass the third color component.