Led chip, led light emitting substrate, display device and control method thereof

Patent metadata

Field	Value
Publication number	US-2020274025-A1
Application number	US-201716063336-A
Country	US
Kind code	A1
Filing date	Dec 7, 2017
Priority date	Apr 12, 2017
Publication date	Aug 27, 2020
Grant date	—

Abstract

The present disclosure relates to the field of LED display technologies, and provides an LED chip, an LED light emitting substrate, a display device and a control method thereof. Specifically, the LED chip comprises: an N-type semiconductor layer, a P-type semiconductor layer, as well as a quantum well layer between the N-type semiconductor layer and the P-type semiconductor layer. The quantum well layer is made of indium gallium nitride, wherein indium atoms have a molar ratio of greater than or equal to 0.3 in the indium gallium nitride.

First claim

1 . An LED chip, comprising:
an N-type semiconductor layer, a quantum well layer and a P-type semiconductor layer, wherein the quantum well layer is located between the N-type semiconductor layer and the P-type semiconductor layer, and the quantum well layer is made of indium gallium nitride, wherein indium atoms have a molar ratio of greater than or equal to 0.3 in the indium gallium nitride.

2 . The LED chip according to claim 1 , wherein
the indium atoms have a molar ratio of 0.4 in the indium gallium nitride.

3 . The LED chip according to claim 1 , further comprising: a substrate layer provided with a buffer layer, wherein
the N-type semiconductor layer, the quantum well layer and the P-type semiconductor layer are arranged on the buffer layer as a whole.

4 . An LED light emitting substrate, comprising:
a plurality of LED chips according to claim 1 ; and a circuit board, wherein the LED chips are arranged on the circuit board, and the circuit board comprises a base substrate and a drive circuit arranged on the base substrate for driving the LED chips.

5 . The LED light emitting substrate according to claim 4 , wherein
the circuit board comprises a CMOS substrate or a TFT substrate.

6 . A display device, comprising:
the LED light emitting substrate according to claim 4 , and an array of pixel units, each pixel unit comprising a plurality of sub-pixel units, wherein each LED chip of the LED light emitting substrate is located within a sub-pixel unit, and the drive circuit of the LED light emitting substrate is configured to transfer current to each LED chip such that the LED chip emits light of a corresponding wavelength.

7 . The display device according to claim 6 , wherein
each pixel unit at least comprises a blue sub-pixel unit, and a blue filter layer is further arranged on a light exit side of the LED chip corresponding to each blue sub-pixel unit.

8 . The display device according to claim 7 , wherein
each pixel unit further comprises a red sub-pixel unit and a green sub-pixel unit, and a red filter layer is further arranged on a light exit side of the LED chip corresponding to each red sub-pixel unit, and a green filter layer is further arranged on a light exit side of the LED chip corresponding to each green sub-pixel unit.

9 . The display device according to claim 7 , further comprises:
a lower polarizing unit, a liquid crystal layer and an upper polarizing unit arranged sequentially in a light exit direction of the LED light emitting substrate, wherein a transmission axis direction of the lower polarizing unit is perpendicular to or in parallel with a transmission axis direction of the upper polarizing unit.

10 . The display device according to claim 9 , wherein
at least one of the lower polarizing unit and the upper polarizing unit comprises a metal wire grating.

11 . The display device according to claim 10 , wherein
the lower polarizing unit comprises a metal wire grating, and the metal wire grating is arranged on a light exit side of each LED chip.

12 . A method for controlling a display device to achieve color display, wherein the display device comprises:
the LED light emitting substrate according to claims 4 , and an array of pixel units, each pixel unit comprising a blue sub-pixel unit, a green sub-pixel unit and a red sub-pixel unit,
wherein
each LED chip of the LED light emitting substrate is located within a corresponding sub-pixel unit, wherein the drive circuit of the LED light emitting substrate is configured to transfer current to each LED chip such that the LED chip emits light of a corresponding wavelength, and
the method comprising:
inputting a first current into the LED chip disposed within the red sub-pixel unit;
inputting a second current into the LED chip disposed within the green sub-pixel unit;
inputting a third current into the LED chip disposed within the blue sub-pixel unit; wherein
a current value of the third current is larger than a current value of the first current, but smaller than a current value of the second current.

13 . The method according to claim 12 , wherein
the current value of the first current is 0.1 mA, the current value of the second current is 60 mA, and the current value of the third current is 8 mA.

14 . The method according to claim 13 , wherein
a ratio of duty cycles of the first current, the second current and the third current is 120:1:4.

15 . The method according to claim 12 , wherein
the display device further comprises a blue filter layer, a red filter layer and a green filter layer arranged respectively on light exit sides of the LED chips corresponding to each blue sub-pixel unit, each green sub-pixel unit and each red sub-pixel unit.

16 . The method according to claim 12 , wherein
the current value of the first current falls in a range of smaller than 0.1 mA the current value of the second current falls in a range of 25 mA-100 mA; and the current value of the third current falls in a range of greater than 0.5 mA.

17 . The method according to claim 12 , wherein
a duty cycle of the third current is larger than a duty cycle of the second current, but smaller than a duty cycle of the first current.

18 . An LED light emitting substrate, comprising:
a plurality of LED chips according to claim 2 ; and a circuit board, wherein the LED chips are arranged on the circuit board, and the circuit board comprises a base substrate and a drive circuit arranged on the base substrate for driving the LED chips.

19 . An LED light emitting substrate, comprising:
a plurality of LED chips according to claim 3 ; and a circuit board, wherein the LED chips are arranged on the circuit board, and the circuit board comprises a base substrate and a drive circuit arranged on the base substrate for driving the LED chips.

20 . A display device, comprising:
the LED light emitting substrate according to claim 5 , and an array of pixel units, each pixel unit comprising a plurality of sub-pixel units, wherein each LED chip of the LED light emitting substrate is located within a sub-pixel unit, and the drive circuit of the LED light emitting substrate is configured to transfer current to each LED chip such that the LED chip emits light of a corresponding wavelength.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Wang Huijuan
• Wang Meili
• Lv Zhenhua
• Wang Fei
• Yang Zezhou

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• H10H20/825

  containing nitrogen, e.g. GaN · CPC title

• H10H20/812 Primary

  within the light-emitting regions, e.g. having quantum confinement structures · CPC title