Unlock instant, AI-driven research and patent intelligence for your innovation.

Display backlight with patterned backlight extraction ridges

A display and backlight technology, applied in the field of electronic devices, can solve problems such as consumption and internal volume of multiple displays

Active Publication Date: 2019-12-20
APPLE INC
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Backlight units requiring large blending distances may consume more internal display volume than desired
At the same time, reducing the blending distance in the backlight too much can lead to undesired backlight hotspots

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Display backlight with patterned backlight extraction ridges
  • Display backlight with patterned backlight extraction ridges
  • Display backlight with patterned backlight extraction ridges

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] figure 1 An exemplary electronic device of the type that may be provided with a display is shown. Such as figure 1 As shown, the electronic device 10 may have a control circuit 16 . Control circuitry 16 may include storage and processing circuitry for supporting the operation of device 10 . Storage devices and processing circuitry may include storage devices such as hard disk drives, non-volatile memory (e.g., flash memory or other electrically programmable read-only memory configured to form a solid-state drive), volatile memory (e.g., static or dynamic random access memory) access memory) and other storage devices. Processing circuitry in control circuitry 16 may be used to control the operation of device 10 . The processing circuitry may be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio chips, application specific integrated circuits, and the like.

[0025] Input-output circui...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A display may have a backlight unit with a row of light-emitting diodes that emit light into the edge of a light guide plate. The light guide plate may have opposing upper and lower surfaces. Backlight may be extracted from the light guide plate using an array of bumps on the lower surface and ridges on the upper surface. Ridge density may vary as a function of location across the display. Some of the ridges may be terminated along a meandering border between regions of differing ridge density. Ridge length and endpoint location can be dithered along borders between regions and ridge widths and thicknesses may be tapered down towards the endpoints. Ridges may be patterned to reduce the density of the ridges immediately adjacent the light-emitting diodes and thereby avoid over-extraction of the light at the light-emitting diodes.

Description

technical field [0001] The present application relates generally to electronic devices with displays, and more particularly, to displays with backlights. Background technique [0002] Electronic devices such as computers and mobile phones have displays. Some displays, such as plasma displays and organic light emitting diode displays, have an array of pixels that generate light. In this type of display, a backlight is not necessary because the pixels generate the light themselves. Other displays contain passive pixels that can vary the amount of light transmitted through the display to display information to the user. Because passive pixels do not generate light themselves, it is often necessary to provide a backlight for displays with passive pixels. [0003] In a typical backlight assembly for a display, a light guide plate is used to disperse the backlight generated by a light source such as a light emitting diode light source. Optical films such as diffusion layers an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357
CPCG02F1/133615G02F1/133607G02B6/0016G02B6/002G02B6/0036G02B6/0038G02B6/0061
Inventor M·J·布朗
Owner APPLE INC