Display element with reduced backlight in the edge region

Patent metadata

Field	Value
Publication number	US-11966069-B2
Application number	US-202117925239-A
Country	US
Kind code	B2
Filing date	May 3, 2021
Priority date	May 15, 2020
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A display including a display panel and a backlight arranged behind the display panel, with a light guide with edge coupling, wherein the backlight is designed so the light intensity of the backlight is lower in a peripheral region of the display panel than in a central region of the display panel.

First claim

The invention claimed is:

1. A display comprising:
a display panel; and
a backlight, the backlight comprising:
a light source arranged to emit light to the display panel; and
a light guide coupled to the light source,

wherein the backlight is configured to emit light of a first light intensity to a peripheral region of the display panel and a second light intensity to a central region of the display panel, and
wherein the first light intensity is less than the second light intensity,
wherein the backlight further comprises microstructuring configured to couple out light received from the light source to the display panel, and
wherein the microstructuring is configured to couple out light of the first intensity from the light guide to the peripheral region of the display panel and couple out light of the second intensity from the light guide to the central region of the display panel.

2. The display as claimed in claim 1 , wherein the microstructuring is arranged on an upper side of the light guide that faces the display panel, on a lower side of the light guide that opposes the upper side of the light guide, or on the upper side and the lower side of the light guide.

3. The display as claimed in claim 1 , wherein the microstructuring comprises a plurality of coupling-out structures, and
wherein microstructuring is configured to couple out the light of the first intensity from the light guide to the peripheral region of the display panel based on a quantity of the location-dependent plurality of coupling-out structures or a location-dependent property of the plurality of coupling-out structures, the location-dependent property comprising at least one of location-dependent depth structure, a location-dependent angle of inclination, or a location-dependent size of the plurality of coupling-out structures.

4. The display as claimed in claim 1 , wherein the light of the first light intensity has a gradient in the peripheral region of the display panel.

5. The display as claimed in claim 1 , wherein a first amount of light of the first intensity is less than a second amount of light of the second intensity.

6. A display comprising:
a display panel; and
a backlight, the backlight comprising:
a light source arranged to emit light to the display panel; and
a light guide coupled to the light source,

wherein the backlight is configured to emit light of a first light intensity to a peripheral region of the display panel and a second light intensity to a central region of the display panel, and
wherein the first light intensity is less than the second light intensity,
wherein the backlight further comprises at least one light-influencing fade-out element configured to transmit light of the first intensity from the light guide to the peripheral region of the display panel and transmit light of the second intensity from the light guide to the central region of the display panel.

7. The display as claimed in claim 6 , wherein the at least one light-influencing fade-out element is an optical layer of an optical stack of the backlight having a transmission gradient to transmit the light of the first intensity from the light guide to the peripheral region of the display panel and transmit the light of the second intensity from the light guide to the central region of the display panel.

8. The display as claimed in claim 6 , wherein the at least one light-influencing fade-out element is a print applied to the light guide or to an optical stack of the backlight having a transmission gradient to transmit the light of the first intensity from the light guide to the peripheral region of the display panel and transmit the light of the second intensity from the light guide to the central region of the display panel.

9. The display as claimed in claim 6 , wherein the backlight further comprises a reflector, and
wherein the at least one light-influencing fade-out element is an optical layer arranged on the reflector or a print applied to the reflector having a transmission gradient to transmit the light of the first intensity from the light guide to the peripheral region of the display panel and transmit the light of the second intensity from the light guide to the central region of the display panel.

10. The display as claimed in claim 6 , wherein the light of the first light intensity has a gradient in the peripheral region of the display panel.

11. The display as claimed in claim 6 , wherein a first amount of light of the first intensity is less than a second amount of light of the second intensity.

Assignees

• Continental Automotive Tech Gmbh

Inventors

• Bäthis Jürgen
• Jakoby Oliver
• Brüninghaus Andreas
• Möller Jochen

Classifications

• G02B6/0035 Primary

  provided on the surface of the light guide or in the bulk of it · CPC title

• G02B6/0043

  provided on the surface of the light guide · CPC title

• G02B6/005

  provided by one optical element, or plurality thereof, placed on the light output side of the light guide · CPC title

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title