LED display with wavelength conversion layer

• US 9,599,857 B2
• Filed: 07/28/2015
• Issued: 03/21/2017
• Est. Priority Date: 06/18/2013
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Bibl, Andreas, McGroddy, Kelly
• Primary Examiner(s): TRAN, MINH LOAN
• Application Number:
  US14/811,417
• Publication Number:
  US 20150331285A1
• Time in Patent Office: 602 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133603 with LEDs
• 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: G09F 9/00 Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: H01L 24/95 at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/12042 LASER
• CPC Class Codes: H01L 2924/12044 OLED
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/52 : Encapsulations
• CPC Class Codes: H01L 33/54 : having a particular shape
• CPC Class Codes: H01L 33/56 : Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 : Optical field-shaping elements
• CPC Class Codes: H10K 50/86 : Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/122 : Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/38 : comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/8791 : Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

A display and method of manufacture are described. The display may include a substrate including an array of pixels with each pixel including multiple subpixels, and each subpixel within a pixel is designed for a different color emission spectrum. An array of micro LED device pairs are mounted within each subpixel to provide redundancy. An array of wavelength conversion layers comprising phosphor particles are formed over the array of micro LED device pairs for tunable color emission spectrum.

Claims

1. A display panel comprising:

a display substrate

an array of LED devices mounted on the display substrate within a corresponding array of subpixels in a pixel area of the display substrate;

a cover over the display substrate;

an array of wavelength conversion layers on the cover and positioned directly over the array of LED devices;

an array of color filter layers on the cover and directly over the array of wavelength conversion layers;

a pattern of black matrix material on the cover and arranged between the array of subpixels; and

one or more top electrode layers underneath the cover, and spanning over the display substrate and the array of LED devices and in electrical contact with the array of LED devices.

2. The display panel of claim 1, wherein the one or more top electrode layers comprises a transparent conductive oxide material.

3. The display panel of claim 1, further comprising:

a ground line on or within the display substrate; and

the one or more top electrode layers electrically connects the array of LED devices to the ground line.

4. The display panel of claim 1, wherein the cover is a glass plate.

5. The display panel of claim 1, wherein the cover is sealed around peripheral edges of the display substrate.

6. The display panel of claim 1, further comprising:

an array of pixels, each pixel comprising a plurality of subpixels designed for different color emission spectra, wherein the plurality of subpixels comprises;

a first subpixel including;

a first LED device;

a second subpixel including;

a second LED device;

a wavelength conversion layer of the array of wavelength conversion layers;

wherein a wavelength conversion layer is not positioned directly over the first LED device, and wherein the first and second LED devices have the same composition for the same emission spectrum.

7. The display panel of claim 6, wherein the first and second LED devices are designed to emit a primary blue wavelength.

8. The display panel of claim 7, further comprising an array of color filter layers on the cover and directly above the array of wavelength conversion layers, wherein the array of color filter layers is to absorb the primary blue wavelength.

9. The display panel of claim 1, further comprising:

an array of pixels, each pixel comprising a plurality of subpixels designed for different color emission spectra, wherein the plurality of subpixels comprises;

a first subpixel including;

a first LED device;

a first wavelength conversion layer of the array of wavelength conversion layers;

a second subpixel including;

a second LED device;

a second wavelength conversion layer of the array of wavelength conversion layers;

wherein the first and second LED devices have the same composition for the same emission spectrum.

10. The display panel of claim 9, wherein the first and second LED devices are designed to emit a primary ultraviolet or deep blue wavelength.

11. The display panel of claim 10, wherein the array of color filter layers is to absorb the primary ultraviolet or deep blue wavelength.

12. The display panel of claim 1, further comprising an array of controller chips in the pixel area, each controller chip to switch and drive a corresponding plurality of LED devices of the array of LED devices.

13. The display panel of claim 12, further comprising a pattern of electrical distribution lines connecting the array of controller chips to the array of LED devices.

14. The display panel of claim 1, wherein the pattern of electrical distribution lines connects the array of controller chips to a data driver circuit and a scan driver circuit.

15. The display panel of claim 14, wherein the data driver circuit and a scan driver circuit are outside the pixel area of the display substrate.