# US 10,872,936 B2 · Display device having both organic electroluminescent display panel as backlight source and liquid crystal display panel

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- Number: US 10,872,936 B2
- Document ID: US10872936B2
- Status: Granted
- Kind: B2
- Application number: 16/140,648
- Filed: 2018-09-25
- Published: 2019-06-20
- Granted: 2020-12-22
- Earliest claimed: 2017-12-18
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: BOE Technology Group Co., Ltd.
- Inventors: Changyen Wu; Bin Bo; Guang Yan
- Web page: https://patentgrep.com/patent/US10872936B2

## CPC

- H10K 59/50: OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
- G02F 1/133514: {Colour filters}
- G02F 1/133603: {with LEDs}
- G02F 1/133609: {including means for improving the color mixing, e.g. white}
- G02F 1/133621: {providing coloured light (G02F1/133617, G02F1/133533 take precedence)}
- H10K 50/125: specially adapted for multicolour light emission, e.g. for emitting white light
- H10K 59/128: comprising two independent displays, e.g. for emitting information from two major sides of the display
- H10K 59/38: comprising colour filters or colour changing media [CCM]
- G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
- G02F 2201/52: RGB geometrical arrangements
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A display device is provided in embodiments of the disclosure relating to the field of display technology, the display device including: a liquid crystal display panel; and an organic electroluminescent display panel provided opposite to the liquid crystal display panel and configured to function as a backlight source for the liquid crystal display panel; the liquid crystal display panel has a display region defined therein, and comprises a plurality of pixel units arranged in an array and located in the display region, each of the plurality of pixel units comprising a plurality of sub-pixel units; the organic electroluminescent display panel has a light-emitting region defined therein and opposite to the display region, and comprises a plurality of light-emitting units arranged in an array and located in the light-emitting region, each of the plurality of light-emitting units comprising a plurality of light-emitting sub-units; and an area of each of the plurality of sub-pixel units is smaller than an area of a corresponding one of the plurality of light-emitting sub-units at least overlapping therewith.

## Claims

### Claim 1

A display device, comprising:
a liquid crystal display panel, comprising:
a color film substrate on which a plurality of color filter blocks of various colors arranged in an array are formed, each of the plurality of color filter blocks presenting a single color;
an array substrate which is aligned and assembled with the color film substrate, on which array substrate there are formed with thin film transistor switches, pixel electrodes and a common electrode all arranged in an array; and
a liquid crystal layer encapsulated between the color film substrate and the array substrate; and
an organic electroluminescent display panel provided opposite to the liquid crystal display panel and configured to function as a backlight source for the liquid crystal display panel,
wherein the liquid crystal display panel has a display region defined therein, and comprises a plurality of pixel units arranged in an array and located in the display region, each of the plurality of pixel units comprising a plurality of sub-pixel units;
each color filter block presenting a single color and located on the color film substrate, and a respective thin film transistor switch, a respective pixel electrode and the common electrode which are provided corresponding to the color filter block and located on the array substrate, as well as liquid crystal molecules provided in a respective portion of the liquid crystal layer between the color filter block and the respective thin film transistor switch, the respective pixel electrode and the common electrode cooperatively define a respective one of the plurality of sub-pixel units, collectively;
the organic electroluminescent display panel has a light-emitting region defined therein and opposite to the display region, and comprises a plurality of light-emitting units arranged in an array and located in the light-emitting region, each of the plurality of light-emitting units comprising a plurality of light-emitting sub-units; and
wherein an area of each of the plurality of sub-pixel units is smaller than an area of a corresponding one of the plurality of light-emitting sub-units at least partially overlapping therewith;
wherein the plurality of the pixel units and the plurality of light-emitting units are provided in one-to-one correspondence with each other, and each of the plurality of the pixel units has an area identical to that of each of the plurality of light-emitting units;
the area of each of the plurality of sub-pixel units is equal to 1/2 of the area of each of the plurality of light-emitting sub units; and
each of the plurality of light-emitting sub units is provided corresponding to two corresponding sub-pixel units of the plurality of sub-pixel units;
wherein in each of the plurality of pixel units, the plurality of sub-pixel units comprise: a first sub-pixel unit, a second sub-pixel unit, a third sub-pixel unit and a fourth sub-pixel unit;
wherein in each of the plurality of light-emitting units, the plurality of light-emitting sub-units comprise: a first light-emitting sub-unit configured to emit a first light, and a second light-emitting sub-unit configured to emit a second light;
the first light-emitting sub-unit is arranged corresponding to the first sub-pixel unit and the second sub pixel unit to transmit the first light through the first sub pixel unit and the second sub-pixel unit respectively, and then to display a first color and a second color respectively;
the second light-emitting sub unit is arranged corresponding to the third sub pixel unit and the fourth sub-pixel unit to transmit the second light through the third sub pixel unit and the fourth sub-pixel unit respectively, and then to display a third color and a fourth color respectively.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel unit and the second sub-pixel unit are a red sub-pixel unit and a green sub-pixel unit, respectively, and the third sub-pixel unit and the fourth sub-pixel unit are a blue sub-pixel unit and a white sub-pixel unit, respectively;
the first light-emitting sub-unit is a yellow light-emitting sub-unit and the first light is thus a yellow light; and
the second light-emitting sub-unit is a white light-emitting sub-unit and the second light is thus a white light.

### Claim 3 (depends on 2)

The display device according to claim 2, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel unit and the second sub-pixel unit are a red sub-pixel unit and a blue sub-pixel unit, respectively, and the third sub-pixel unit and the fourth sub-pixel unit are a green sub-pixel unit and a white sub-pixel unit, respectively;
the first light-emitting sub-unit is a violet light-emitting sub-unit and the first light is thus a violet light; and
the second light-emitting sub-unit is a white light-emitting sub-unit and the second light is thus a white light.

### Claim 5 (depends on 4)

The display device according to claim 4, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel unit and the second sub-pixel unit are a green sub-pixel unit and a blue sub-pixel unit, respectively, and the third sub-pixel unit and the fourth sub-pixel unit are a red sub-pixel unit and a white sub-pixel unit, respectively;
the first light-emitting sub-unit is a cyan light-emitting sub-unit and the first light is thus a cyan light; and
the second light-emitting sub-unit is a white light-emitting sub-unit and the second light is thus a white light.

### Claim 7 (depends on 6)

The display device according to claim 6, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.

### Claim 8 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel unit and the second sub-pixel unit are a red sub-pixel unit and a green sub-pixel unit, respectively, and the third sub-pixel unit and the fourth sub-pixel unit are a blue sub-pixel unit and a yellow sub-pixel unit, respectively;
the first light-emitting sub-unit is a yellow light-emitting sub-unit and the first light is thus a yellow light; and
the second light-emitting sub-unit is a white light-emitting sub-unit and the second light is thus a white light.

### Claim 9 (depends on 8)

The display device according to claim 8, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.

### Claim 10 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel unit and the second sub-pixel unit are a red sub-pixel unit and a blue sub-pixel unit, respectively, and the third sub-pixel unit and the fourth sub-pixel unit are a green sub-pixel unit and a yellow sub-pixel unit, respectively;
the first light-emitting sub-unit is a violet light-emitting sub-unit and the first light is thus a violet light; and
the second light-emitting sub-unit is a yellow light-emitting sub-unit and the second light is thus a yellow light.

### Claim 11 (depends on 10)

The display device according to claim 10, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.

### Claim 12 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel unit and the second sub-pixel unit are a green sub-pixel unit and a blue sub-pixel unit, respectively, and the third sub-pixel unit and the fourth sub-pixel unit are a red sub-pixel unit and a yellow sub-pixel unit, respectively;
the first light-emitting sub-unit is a cyan light-emitting sub-unit and the first light is thus a cyan light; and
the second light-emitting sub-unit is a yellow light-emitting sub-unit and the second light is thus a yellow light.

### Claim 13 (depends on 12)

The display device according to claim 12, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.

### Claim 14 (depends on 1)

The display device according to claim 1, wherein the area of each of the plurality of sub-pixel units is smaller than the area of a corresponding one of the plurality of light-emitting sub-units overlapping therewith, and an area of each of the plurality of pixel units is smaller than an area of a corresponding one of the plurality of light-emitting units overlapping therewith; and
wherein each of the plurality of light-emitting sub-units is a white light-emitting sub-unit emitting a white light.

### Claim 15 (depends on 14)

The display device according to claim 14, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.

### Claim 16 (depends on 1)

The display device according to claim 1, wherein the organic electroluminescent display panel is an Active-Matrix driving type organic electroluminescent display panel, which further comprises a driving unit configured to drive each of the plurality of light-emitting sub-units to emit light.