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Backlight unit with support posts and cavity height monitoring

A technology of support column and backlight, applied in the direction of light source, optics, nonlinear optics, etc., can solve the problems of insufficient uniformity of light and unsatisfactory uniformity of backlight changes.

Active Publication Date: 2018-11-13
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the light produced by a direct-lit backlight may not be uniform enough if care is not taken
For example, variations in the distance between the LEDs and the overlapping diffusion layer can lead to non-ideal variations in the uniformity of the backlight

Method used

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  • Backlight unit with support posts and cavity height monitoring
  • Backlight unit with support posts and cavity height monitoring
  • Backlight unit with support posts and cavity height monitoring

Examples

Experimental program
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Embodiment Construction

[0023] The electronic device may be provided with a backlit display. A backlit display may include an array of liquid crystal pixels or other display structures backlit by light from a direct-lit backlight unit. figure 1 A perspective view of an exemplary electronic device of the type that may be provided with a display having a direct-lit backlight unit is shown. figure 1 The electronic device 10 may be a computing device such as a laptop computer, a computer monitor including an embedded computer, a tablet computer, a cell phone, a media player, or other handheld or portable electronic device, a smaller device such as a wrist watch devices), pendant devices, headset or earpiece devices, devices embedded in glasses or other devices worn on the user's head, or other wearable or miniature devices, televisions, computers that do not contain embedded computers Displays, gaming devices, navigation devices, embedded systems such as systems in which electronic devices with displays...

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PUM

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Abstract

The invention relates to a backlight unit with support posts and cavity height monitoring. An electronic device may have a display with a backlight. The backlight provides backlight illumination for an array of pixels that is displaying images. The backlight includes an array of cells. Each cell contains a light source with one or more light-emitting diodes and a cavity reflector that reflects light from the light source outwardly through a diffuser for forming the backlight illumination. The light sources are mounted to a printed circuit. Support posts on the printed circuit are used to maintain the diffuser at a fixed distance from the printed circuit. Sensors on the printed circuit are used to measure separation distances between the printed circuit and diffuser. Adjustments to pixel gain distribution can be made based on the measured separation distances.

Description

[0001] This patent application claims priority to U.S. Patent Application No. 15 / 687,374, filed August 25, 2017, and Provisional Patent Application No. 62 / 501,002, filed May 3, 2017, which are hereby incorporated in their entireties by Incorporated herein by reference. Background technique [0002] This invention relates generally to displays, and more particularly to backlit displays. [0003] Electronic devices often include displays. For example, computers and cell phones sometimes have backlit liquid crystal displays. The edge type backlight unit has light emitting diodes that emit light to edge surfaces of the light guide plate. The light guide plate then distributes the emitted light laterally across the display for backlighting. A direct-lit backlight unit has an array of light-emitting diodes that emit light vertically through the display. [0004] Direct-lit backlights may have locally dimmable LEDs that allow dynamic range to be enhanced. However, the light prod...

Claims

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Application Information

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IPC IPC(8): G02F1/13357
CPCG02F1/133605G02F1/133606G02F1/133608G02F1/133603G02F1/133611F21K9/64F21K9/68G09G3/3406G09G3/3648
Inventor 刘榕Y·P·孙E·A·子维格勒齐军V·H·因洪自若S·裴
Owner APPLE INC