Content Independent Backlight Power Saving Technology For Mobile Devices

Content Independent Backlight Power Saving Technology For Mobile Devices

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Description: Why Does Longer Battery Life Matter? Battery dies when: Using phone as a navigational aid, Watching a movie, Completing a sales pitch. Battery Life Calculation: Battery Life in hours ~= Battery Capacity in Watt hours/Average platform power consumption, Example (7 hours) ~= 35 Whr/ 5W, Example (9 hours) ~= 45Whr/ 5W, Example (9 hours) ~= 35 Whr/3.88W, Two Options: reduce platform power or increase battery capacity. Display power can be reduced Multimedia can be viewed even in bright sunlight.

 
Author: Kamal Shah, Doug Taylor (Fellow) | Visits: 880 | Page Views: 1079
Domain:  High Tech Category: Displays Subcategory: LCD 
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Contents:
Content Independent Backlight Power
Saving Technology For Mobile Devices
Kamal Shah – Director, EBL Initiative and Sys. Architecture Mgmt.,
Intel Corp.
Doug Taylor, Field Applications Engineer, Apical Inc.
RPCS003
1

Agenda
• Motivation: Need for Longer Battery Life
• Assertive Display Technology Overview
• Display-based Assertive Technology Integration Architecture
• Demo
• Summary and Call to Action, Q&A

2

Agenda
• Motivation: Need for Longer Battery Life
• Assertive Display Technology Overview
• Display-based Assertive Technology Integration Architecture
• Demo
• Summary and Call to Action, Q&A

3

Why Does Longer Battery Life Matter?
Battery dies when:
• Using phone as a navigational aid
• Watching a movie
• Completing a sales pitch

+

=

Without Longer Battery Life User Experience Is Compromised!!!
4

Purchase Factor Importance: Notebook
7

6

5

4

3

2

1
Trusted
manufacturer

5

Fastest
processor

Good quality
display

Lightweight

Long lasting
battery

Thin

New feature

Based on survey of consumer and enterprise users, compiled in 2014, survey commissioned by the EBL WG, conducted by Strategy Analytics

Cheapest
available

Purchase Factor Importance: Smartphone
10
9
8
7

6
5
4
3
2
1

6

Based on survey of consumer and enterprise users, compiled in 2014, survey commissioned by the EBL WG, conducted by Strategy Analytics

Battery Life Calculation
• Battery Life in hours ~= Battery Capacity in Watt hours/Average
platform power consumption
• Example (7 hours) ~=

35 Whr/ 5W

• Example (9 hours) ~=

45Whr/ 5W

• Example (9 hours) ~= 35 Whr/3.88W

TWO OPTIONS: reduce platform power or
increase battery capacity
7

Platform

IDLE

and Display

Local Video

Power

MM012-OP

EEMBC

Display: Significant contributor to platform power
Intel® Core™ M-4302Y Processor QS, embedded DisplayPort* 19x10 panel, 11.6 inch, 200 NITS brightness, source: Intel measurements

8

Software and workloads used in performance tests may have been optimized for performance only on Intel microprocessors. Performance tests, such as SYSmark* and MobileMark*, are measured using specific computer
systems, components, software, operations and functions. Any change to any of those factors may cause the results to vary. You should consult other information and performance tests to assist you in fully evaluating your
contemplated purchases, including the performance of that product when combined with other products. For more information go to http://www.intel.com/performance.

Delivering Optimal Contrast Ratio (CR)
• Question: Experience with improving viewability
• Contrast ratio: Luminance of brightest color ( white)
Luminance of darkest color ( black)
• Best measured in a dark room
• Image CR to match display CR for optimal visual exp.
• Ambient light brings CR down

Improving CR: Increase backlight OR process pixels
9

Bright Light Viewability

*

10

*

Source: http://www.displaymate.com/Tablet_Brightness_ShootOut_1.htm#lux_0

*

*

*

*

*

*

Agenda
• Motivation: Need for Longer Battery Life
• Assertive Display Technology Overview
• Display-based Assertive Technology Integration Architecture
• Demo
• Summary and Call to Action, Q&A

11

You can't watch a movie by the pool…
…can you?

Amazon* Kindle* “Poolside” commercial Fall 2010

12

What is Apical’s Assertive Display?
Assertive Display is a display management subsystem which
addresses the two most important problems for mobile displays:

Display power can be reduced
Multimedia can be viewed even in bright sunlight
Assertive Display operates with all current screen technologies, and
can be calibrated to the specific screen response characteristics

13

www.apical.co.uk

Assertive Display

Source: Apical’s UK engineering center
14

Lumia* 1520
with Assertive Display

Assertive Display Combines
3 Interacting Analytical Models
Screen
reflectance
model

Eye adaptation to
model

15

Accurate digital
model of human
vision

Eye adaptation
to
viewing
environment
model

The Challenge of the Mobile Viewing Environment
Difficult for emissive
display to compete with
sun’s brightness!
screen
emissions

16

Often need to reduce
display brightness to
conserve power

Problem Statement

Display contrast ratio is
affected independently
from the bright and dark
ends of the range
Display contrast ratio must
be adapted independently

17

Full
brightness
Dark room

Reduced
brightness
Dark room

Reduced
brightness
Bright room

Why is Assertive Display effective?

• It enables
independent
adjustment of bright
and dark regions of
each frame

• So it decouples
brightness from
contrast ratio

18



Brightness can be
set according to
preference and
power saving



Contrast ratio is
always correct for
optimal multimedia
viewability

Video Processing Engine:
Pixel-by-Pixel Tone Mapping
Contrast in
highlights
enhanced
Contrast in
midtones
preserved

Assertive Display calculates a unique tone
curve for each pixel of each frame
19

Contrast in
shadows
enhanced

Watch a Movie in Any Condition

Assertive Display: Display at max brightness:
Content adapted to
contrast ratio too low for
display contrast ratio
multimedia
Same power consumption

20

Source: Apical’s UK engineering center

Backlight

Realizing ~25% Backlight Power Savings

Ambient Light
Normal indoor conditions
21

Source: Auto-brightness curves generated at Apical’s UK engineering center

Assertive Display: Power Savings and Improved
Multimedia Viewability

No Assertive
Display:
100% screen
brightness
22

Source: Apical’s UK engineering center

Assertive
Display:
100% screen
brightness

Assertive Display:
25% screen
brightness

Assertive Display Core IP is Associated With 6
Separate Patents
3 patents covering:
Local tone mapping
Local contrast management
Local color management

3 patents covering:
ALS processing
Backlight processing
Backlight control
Display control

Assertive Display Core v3

Ambient light (ALS)
Brightness (backlight)

Assertive Display Control

VIDEO PIPELINE

RGB

23

IRIDIX7 Display Engine
gamma LUT
perceptual dither

RGB

Agenda

• Display-based Assertive Technology Integration Architecture
• Demo
• Summary and Call to Action, Q/A

24

Architecture Overview
System

SoC with
graphics
Lux

ALS

Bright
ness

LCD Panel
TCON

Embedded DisplayPort* (eDP) mainlink

eDP Aux (Lux, brightness)

AD IP

Backlight Control
Requirements:
• ALS sensor, eDP panel with AD IP in the TCON
• Intel® Architecture-based system
• Graphics driver with AD IP support

25

Power Savings
500 LUX

Non Apical
Solution

Apical
Solution

Lux

500

500

image1
image2
image3
video1
video2
Average

(W)
3.344
3.355
3.379
3.394
3.389
3.372

(W)
2.592
2.604
2.594
2.597
2.573
2.592

Apical
Power
Savings
Over
Default

Apical
Power
Savings %
Over
Default

(W)
0.752
0.751
0.785
0.797
0.816
0.780

(%)
22.5%
22.4%
23.2%
23.5%
24.1%
23.13%

Source: backlight power measured in Intel labs on a prototype panel with Apical technology integrated
26

Agenda
• Motivation: Need for Longer Battery Life
• Assertive Display Technology Overview
• Display-based Assertive Technology Integration Architecture
• Demo
• Summary and Call to Action, Q&A

27

Dual-screen 1080p60 AD Demo
Original image
From the laptop

Display #1 (no AD)

HDMI

HDMI*

Original image
From the
laptop

28

HDMI

Apical FPGA
AD Demo Board

Display #2 (AD)

DVI

HDMI*
Splitter

AD processed image
From the laptop

Agenda
• Motivation: Need for Longer Battery Life
• Assertive Display Technology Overview
• Display-based Assertive Technology Integration Architecture
• Demo
• Summary and Call to Action, Q&A

29

Summary and Call to Action
• Longer battery life and outdoor/bright light viewability are important
features for mobile devices
• Content independent local tone mapping technology is available on
Intel notebook platforms
• System integrators (OEMs, ODMs) should request this feature in
display panels from their display suppliers or contact their local Intel
FAE

30

Additional Sources of Information
• A PDF of this presentation is available from our Technical Session
Catalog: www.intel.com/idfsessionsSF. This URL is also printed on the
top of Session Agenda Pages in the Pocket Guide.
• Come and see our demos in the Intel Computing Innovation Exhibit
located on the 2nd floor concourse

31

Legal Notices and Disclaimers
Intel technologies’ features and benefits depend on system configuration and may require enabled hardware, software or service activation. Learn more at intel.com,
or from the OEM or retailer.
No computer system can be absolutely secure.
Tests document performance of components on a particular test, in specific systems. Differences in hardware, software, or configuration will affect actual
performance. Consult other sources of information to evaluate performance as you consider your purchase. For more complete information about performance and
benchmark results, visit http://www.intel.com/performance.
Cost reduction scenarios described are intended as examples of how a given Intel-based product, in the specified circumstances and configurations, may affect future
costs and provide cost savings. Circumstances will vary. Intel does not guarantee any costs or cost reduction.
This document contains information on products, services and/or processes in development. All information provided here is subject to change without notice.
Contact your Intel representative to obtain the latest forecast, schedule, specifications and roadmaps.
Statements in this document that refer to Intel’s plans and expectations for the quarter, the year, and the future, are forward-looking statements that involve a
number of risks and uncertainties. A detailed discussion of the factors that could affect Intel’s results and plans is included in Intel’s SEC filings, including the annual
report on Form 10-K.
The products described may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current
characterized errata are available on request.
No license (express or implied, by estoppel or otherwise) to any intellectual property rights is granted by this document.
Intel does not control or audit third-party benchmark data or the web sites referenced in this document. You should visit the referenced web site and confirm whether
referenced data are accurate.
Intel, Core, and the Intel logo are trademarks of Intel Corporation in the United States and other countries.

*Other names and brands may be claimed as the property of others.
© 2015 Intel Corporation.

32

Risk Factors

The above statements and any others in this document that refer to plans and expectations for the second quarter, the year and the future are forwardlooking statements that involve a number of risks and uncertainties. Words such as "anticipates," "expects," "intends," "plans," "believes," "seeks,"
"estimates," "may," "will," "should" and their variations identify forward-looking statements. Statements that refer to or are based on projections, uncertain
events or assumptions also identify forward-looking statements. Many factors could affect Intel's actual results, and variances from Intel's current
expectations regarding such factors could cause actual results to differ materially from those expressed in these forward-looking statements. Intel
presently considers the following to be important factors that could cause actual results to differ materially from the company's expectations. Demand for
Intel's products is highly variable and could differ from expectations due to factors including changes in business and economic conditions; consumer
confidence or income levels; the introduction, availability and market acceptance of Intel's products, products used together with Intel products and
competitors' products; competitive and pricing pressures, including actions taken by competitors; supply constraints and other disruptions affecting
customers; changes in customer order patterns including order cancellations; and changes in the level of inventory at customers. Intel's gross margin
percentage could vary significantly from expectations based on capacity utilization; variations in inventory valuation, including variations related to the
timing of qualifying products for sale; changes in revenue levels; segment product mix; the timing and execution of the manufacturing ramp and associated
costs; excess or obsolete inventory; changes in unit costs; defects or disruptions in the supply of materials or resources; and product manufacturing
quality/yields. Variations in gross margin may also be caused by the timing of Intel product introductions and related expenses, including marketing
expenses, and Intel's ability to respond quickly to technological developments and to introduce new products or incorporate new features into existing
products, which may result in restructuring and asset impairment charges. Intel's results could be affected by adverse economic, social, political and
physical/infrastructure conditions in countries where Intel, its customers or its suppliers operate, including military conflict and other security risks, natural
disasters, infrastructure disruptions, health concerns and fluctuations in currency exchange rates. Results may also be affected by the formal or informal
imposition by countries of new or revised export and/or import and doing-business regulations, which could be changed without prior notice. Intel
operates in highly competitive industries and its operations have high costs that are either fixed or difficult to reduce in the short term. The amount, timing
and execution of Intel's stock repurchase program could be affected by changes in Intel's priorities for the use of cash, such as operational spending,
capital spending, acquisitions, and as a result of changes to Intel's cash flows or changes in tax laws. Product defects or errata (deviations from published
specifications) may adversely impact our expenses, revenues and reputation. Intel's results could be affected by litigation or regulatory matters involving
intellectual property, stockholder, consumer, antitrust, disclosure and other issues. An unfavorable ruling could include monetary damages or an
injunction prohibiting Intel from manufacturing or selling one or more products, precluding particular business practices, impacting Intel's ability to design
its products, or requiring other remedies such as compulsory licensing of intellectual property. Intel's results may be affected by the timing of closing of
acquisitions, divestitures and other significant transactions. A detailed discussion of these and other factors that could affect Intel's results is included in
Intel's SEC filings, including the company's most recent reports on Form 10-Q, Form 10-K and earnings release.
Rev. 4/14/15
33

Backup

34

Display Contrast Ratio Changes From 45,000:1 to 50:1 With Ambient Light
Measured Maximum
Brightness
100% Full Screen White

Brightness 541 cd/m2
Excellent

Brightness 556 cd/m2
Excellent

Brightness 224 cd/m2
Poor

Maximum Brightness is very important
for mobile
because of the typically high ambient
light levels.

Measured Peak
Brightness
1% Full Screen White

Brightness 541 cd/m2
Excellent

Brightness 556 cd/m2
Excellent

Brightness 283 cd/m2
Good

This is the Brightness for a screen that
has only a tiny 1% Average Picture
Level.

Black Level
at Maximum Brightness

Black is 0.48 cd/m2
Very Good for Mobile

Black is 0.41 cd/m2
Very Good for Mobile

Less than 0.005 cd/m2
Outstanding

Black brightness is important for low
ambient light,
which is seldom the case for mobile
devices.
Only relevant for low ambient light,
which is seldom the case for mobile
devices.
Defined as Maximum Brightness /
Black Brightness.

Contrast Ratio
Relevant for Low Ambient
Light
Contrast Rating
for High Ambient Light
Screen Readability in
Bright Light

1,117
Very Good for Mobile

1,356
Very Good for Mobile

Greater than 45,000
Outstanding

Bright Contrast 77
Very Good

Bright Contrast 121
Excellent

Bright Contrast 45 - 57
Good

Very Good A–

iPhone* 4

35

Source: http://www.displaymate.com/Smartphone_ShootOut_2.htm
Contrast ratio for High Ambient Light measured at 40,000 lux

Excellent

iPhone 5

A

Good B

Galaxy* S III

Defined as Maximum Brightness /
Average Reflectance.
Indicates how easy it is to read the
screen
under high ambient lighting. Very
Important!
See High Ambient Light Screen Shots