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Displays with adjustable direct-lit backlight units

A display and backlight technology, applied to static indicators, instruments, optics, etc.

Active Publication Date: 2020-10-27
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if care is not taken, direct lit backlights can be bulky or can produce undesired visible artifacts

Method used

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  • Displays with adjustable direct-lit backlight units
  • Displays with adjustable direct-lit backlight units
  • Displays with adjustable direct-lit backlight units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] 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 equipment worn on the user's head, or other wearable or miniature devices, televisions, computers that do not include embedded computers Displays, game devices, navigation devices, embedded systems such as systems in which electronic equipment with displa...

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PUM

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Abstract

The disclosure relates to displays with adjustable direct-lit backlight units. A display is disclosed herein. The display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated by a backlight unit that includes an array of light-emitting diodes. A backlight brightness selection circuit may select brightness values for the light-emitting diodes. The backlight brightness selection circuit may select the brightness values based on image data, based on brightness values used in previous image frames, based on device information, and / or based on sensor information. The backlight brightness selection circuit may select the backlight brightness levels to mitigate visible artifacts such as flickering and halo. The backlight levels selected by the backlightbrightness selection may be modified by a power consumption compensation circuit. The power consumption compensation circuit may estimate the amount of power consumption required to operate the backlight using the target brightness levels and may modify the target brightness levels to meet maximum power consumption requirements.

Description

[0001] This patent application claims priority to U.S. Patent Application 16 / 388,427, filed April 18, 2019, which is hereby incorporated by reference in its entirety. Background technique [0002] This disclosure 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 can have locally dimmable LEDs that allow for enhanced dynamic range and reduced power consumption. However, if care is not taken, direct lit backlights can be bulky or can produce undesirable visib...

Claims

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Application Information

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IPC IPC(8): G02F1/13357G09G3/34
CPCG02F1/133603G09G3/3406G09G2320/062G09G2360/16G09G2320/0247G09G3/3426G09G2320/0653G09G2320/0646G09G2320/041G09G2360/144G09G3/3648G09G3/36G09G2320/0233
Inventor T·荣格M·阿尔布雷克特D·M·彼得罗维奇张振雄D·S·扎拉蒂莫P-Y·埃米利M·卢特拉乐城瑞洪凌宇姚维信
Owner APPLE INC