104CBL01 - NEC - Datasheet.Live

Renesas Electronics America Inc.

Class ID:

Flat Panel Displays

Overcoming High-Ambient Light Conditions

4C04I

Ferdinand Tercenio, Display BU

Sr. Applications Engineer

Ferdinand Tercenio

Senior Applications Engineer – REA Display Business Unit

Provide Technical Customer Support on LCD applications in the

Americas

–Advise solutions to common LCD problems

–Debug and troubleshoot customer’s application

–Work with NLT Technologies in Japan to resolve advanced

technical issues

Examine REA LCD RMA issues requiring further analysis

–Scrutinize panel failure

–Investigate for reasons of failure

Assist of building demonstration computers and display housings

for field demo program

–Manage Inventory

–Design and Specify custom peripherals

–Add software support

–Debug systems

12 years engineering experience in the Display BU

Renesas Technology & Solution Portfolio

Display Module Solutions

Sophisticated solutions Sustainable support

LED Backlight LCDs

Wide Format LCDs

Suited for a variety of ambient-light

environments

Proprietary transflective LCD technologies

– Reflective-Enhanced View TFT (R-EVT)

– Transmissive-Enhanced View TFT (T-EVT)

More data on a single screen

16:9 aspect ratio

Low power consumption

Long life LEDs

Thin profile and light weight design

Replaceable LED light source unit

High luminance and wide color gamut

Superior image quality

Ultra-wide viewing angles

2D/3D displays

On-cell touch

PCAP touch

Robust feature sets

Long-term product support

Amorphous silicon (A-Si) displays

Low-temperature polysilicon (LTPS) displays

LED Backlight LCDs Enhanced View TFT (EVT)

Wide Format LCDs Super-Fine TFT (SFT)

Industrial Mobile Displays Emerging Technologies

Suited for a variety of ambient-light

environments

Proprietary transflective LCD technologies

– Reflective-Enhanced View TFT (R-EVT)

– Transmissive-Enhanced View TFT (T-EVT)

Enhanced View TFT (EVT)

Innovation

Challenge:

“In the smart society, obtaining information anywhere one

goes will be typical. Usually it is through a display and

being able to view these information under the sun via a

portable devices or fix stations will require some classes of

displays.”

Solution:

“This class will introduce you to the technologies that are

used to overcome high ambient light conditions, understand

what light can do to displays and what NLT can do to provide

and help solve these problems.”

‘Enabling The Smart Society’

Properties of Light

Viewability in High Ambient Light Conditions

Solutions for High Ambient Light Conditions

Technology Overview

Agenda

Properties of Light

Specular Reflection - the mirror-like reflection of light.

Regular reflection

Normal

Properties of Light

Refraction – the change in direction of light when passing

through one transparent medium to another.

AIR

GLASS

Properties of Light

Diffusion – incident light is reflected in many directions

Properties of Light

Glare – Reduction of contrast of the source image due to

high incident light reflections.

Issues Affecting FPD Viewability in High

Ambient Light

Outdoor or direct sunlight

Environmental conditions

Standard AG surface

High reflection

Low contrast

Enhanced for sunlight readability

Low reflection

Improved contrast

Reflection & Glare in Strong Sunlight

Standard Clear Surface

Higher Luminance

and More Contrast

Enhanced Panel

Clearer but still whitish

Front of screen peak luminance

Contrast

Attributes That Affect Viewability

Solutions for High Ambient Light Conditions

CCFL Backlight Systems

High bright CCFL

Touch panels will reduce a display’s luminance and increase

surface reflections making it harder to see.

Extreme brightness of 1100 nits offsets the reduction of

luminance and reflection.

High bright CCFL backlight system

NL8060BC31-36

1100 nits

LED Backlight Systems

High bright LED

To improve backlight life, NLT Technologies, Ltd. optimized the

LED alignment and heat dissipation design achieving a high

bright LED backlight system comparable to high bright CCFL

backlights.

High bright LED backlight system

NL10276BC24-21F

800 nits @ 50mA/circuit

1000 nits @ 70m/circuit

CCFL LED

Light source type Linear type Spot type

Drive method AC

High voltage INV creates

harmonic noise

DC

Dimming range 15 to 100% 0 to 100%

Thermal property Significant thermal

independence

Linear thermal independence

Optical property

deviation

Luminance:±10%

Chromaticity:±0.010

Luminance: over 10%

Chromaticity:～0.025

Power consumption High 40% lower than CCFL

Thermal performance Low start-ability

and shorter life

at low temperatures

Exothermic

Environmental Small amount of Mercury Mercury free

CCFL vs. LED Backlight Systems

Relative luminance vs. temperature

CCFL vs. LED Backlighting

CCFL

LED

温度

相対輝度

Temperature

Relative Luminance

LCD panel

Polarizer

BEF film

Light from a light source

Backlight

Directed and enhanced light

The film is inserted into a backlight to direct diffusive light

from a light source.

Brightness Enhancement Film (BEF)

Reflective polarizer made of multi layer plastic film.

Reflects and transmits light from backlight selectively.

Reflective Polarizer Film (DBEF, APCF and

etc…)

On the film S wave is reflected

and goes back into a backlight

and recycled.

S

Reflective polarizer film

P+S

Recycle

Backlight

LCD panel

Polarizer

P+S

P P

P+S

S S

P+S P+S

The recycled light is mixed with

S and P wave again.

P+S

Recycle Recycle

-60 -40 -20 0 20 40 60

Luminance ratio

○

2.5

2.0

0.5

1.0

○ ○

○

○ ○ Backlight luminance

1.5 △

△ △

△

△ △ Reflective polarizer added

Viewing angle (°)

By using the Reflective Polarizer Film, the brightness is

boosted 1.3 to 1.6 times.

By adding with another BEF film in a backlight, the

brightness can be boosted further more.

Reflective Polarizer Film (DBEF, APCF and

etc…)

AG & AR Passive Enhancement Films

Anti-Glare (AG) - diffuses reflection

Anti-Reflective (AR) - negates reflection

Reflection

Incident light

AG

Diffuses

Reflection

AG surface

LCD

AG Incident light Reflection

AR

Negates

Reflection

AR surface

LCD

AR

Incident light Reflection 1

Reflection 2

Transmitted light

Interface

Anti-Reflection Film

The difference in reflection index and path creates a phase

difference that negates the effect.

Incident light Reflection

LCD panel

AR treatment

Negates reflection by

Interference

AR treatment

Reflection

Incident

Light

LCD Panel

AR Film Details

Low index layer (Sio2 and etc.)

High index layer (TiO2, ITO, Nb2O5 and etc.)

SiO2

High index layer (TiO2)

SiO2

Hard coat or Anti-glare layer

Base film (TAC, PET and etc.)

Adhesive material

Front

Back

AG Film Details

Front

Plastic layer including silica or plastic beads

TAC (Triacetylcellulose )

PVA (Polyvinyl alcohol )

TAC (Triacetylcellulose )

Adhesive material

Back

Glass Glass

Glass Overlay vs. Direct Bonding

Surface reflection

about 0.2%

Glass Overlay Direct Bond + AR Coating

Direct Bonding

AR coated glass attached

directly to the LCD surface

using bonding material

Solution Comparisons

Cost Weight Complexity

High bright

backlight High Middle to

heavy

Very

complex

AG or AR

film Low Low Good

Bonding and

Special

overlays

Very

High

Very

heavy

Very

complex

Technology Overview

Proprietary transflective LCD technologies

Reflective-Enhanced View TFT (R-EVT)

–Formerly known as SR-NLT

Transmissive-Enhanced View TFT (T-EVT)

–Formerly known as ST-NLT

Suited for a variety of ambient-light environments

Enhanced View TFT (EVT)

R-EVT – Reflective-Enhanced View TFT

Backlight ON or OFF – Highly reflective surface, great for direct sunlight

applications where backlight is normally off for maximum power savings

Transflective

pattern

Transmissive area

Regular TN pattern model R-EVT pattern model

R-EVT Mechanism

With full flat reflective pattern only frontal reflection can be seen.

The reflection pattern design is the most crucial. Refraction index from gap

between the reflective pattern and air has to be taken into consideration

Tiny bumpy reflective pattern makes the reflection more diffused.

ψ

θ１

θ４

θ２ θ３

Reflective pattern

Air

Polarizer

R-EVT – Bright Ambient Contrast

Bright ambient contrast

R-EVT has a medium contrast property between complete reflective and

transmissive.

0

5

10

15

20

25

30

35

40

45

50

100 1000 10000 100000

照度（Lx)

コントラスト比（：１)

透過

半透過

反射

室内

雨天

晴

Sunlight Contrast

Transmissive

SR-NLT

Reflective

Indoor Rainy sky Clear sky

Standard TN with BL Off

Reflection ratio: ~0%

R-EVT with BL Off

NEC NL10276BC20-10

Reflection ratio: 35%

R-EVT Comparison

NLT NL10276BC20-10

Backlight ON @ 175 nits Backlight OFF @ 0 nits

Reflection ratio: 35%

Contrast ratio: Transmissive: 150:1

Transflective: 15:1

To contain reflection, even

for R-EVT, AR is

recommended as best

R-EVT Comparison

T-EVT – Transmissive-Enhanced View TFT

Backlight ON – High efficient backlight + proprietary AR

T-EVT – Transmissive-Enhanced View TFT

Bright ambient contrast

Sunlight Contrast

200

400

600

5000 10000 15000 20000

Luminance (Lx)

Competitor LCD 800nits

NL10276BC30-18C 600nits

Magnified

Graph

Bright ambient contrast

8000 12000 16000 20000

0

50

100

Competitor LCD 800nits

NL10276BC30-18C 600nits

Luminance (Lx)

T-EVT is better in bright ambient

Contrast Ratio in Sunlight

Direct

Bonding

Normal LCD

ST-NLT

3:1 is minimum contrast ratio

to see image in sunlight

Competitor LCD

800 nits

T-EVT

NLT NL10276BC30-18C

600 nits

200 nits lower but more

viewable

Competitive Comparison

Examples of High Bright LED Backlight Systems

NL6448BC20-30C/30F

900nits

NL8060BC21-11C/11F

800 nits

NL6448BC33-70C/70F

800nits

R-EVT & T-EVT products carry full manufacturer’s warranty.

NLT uses “passive” enhancements and avoids the reliability pitfalls

of high brighting or overdriving lighting components by “brute

force”. (R-EVT)

While most customers shop “peak luminance” figures what they

should buy is “contrast”. (R-EVT & T-EVT )

An NLT T-EVT panel @ 375 nits equals a standard panel @ 810

nits. Overdriving backlights is not needed.

In standard TN, increasing the peak (white) luminance, black level

also rises making the panel no better in contrast. It may actually

cause “wash out”. Our T-EVT maintains contrast.

Advantages of R-EVT & T-EVT

NLT LED Driver Board

Same footprint as CCFL boards

Support up to 6 series LED strings

Compact size

High Bright LED Backlight Systems

Size LED driver board Driver board harness

6.5 NL6448BC20- 30/30D 104PW03F　 121CBL02

6.5 NL6448BC20- 30C/30F 104PW03F　 121CBL02

8.4 NL6448BC26- 26/26D/27/27D 104PW03F　 121CBL02

8.4 NL6448BC26- 26C/26F/27C/27F 104PW03F　 121CBL02

8.4 NL8060BC21- 10/10D/11/11D 104PW03F　 121CBL02

8.4 NL8060BC21- 10C/10F/11C/11F 104PW03F　 121CBL02

9 NL8048BC24- 09/09D 104PW03F　 121CBL02

10.4 NL6448BC33- 70/70D/71/71D 104PW03F　 121CBL02

10.4 NL6448BC33- 70C/70F/71C/71F 104PW01F 121CBL02

10.4 NL8060BC26- 35/35D/36/36D 104PW03F　 121CBL02

10.4 NL8060BC26- 35C/35F/36C/36F 104PW01F 121CBL02

10.4 NL10276BC20- 18/18D 104PW02F 104CBL01

12.1 NL8060BC31- 46/46D/47/47D 121PW02F 121CBL02

12.1 NL8060BC31- 46C/46F/47C/47F 104PW03F　 121CBL02

12.1 NL8060BC31- 50C/50F 104PW03F　 121CBL03

12.1 NL12880BC20- 05/05D 104PW03F　 121CBL03

15 NL10276BC30- 34D 150PW02F 150CBL02

Part No.

NLT LED driver line up

LED Lifetime @ Temperature

1 10 100 1000 10000 100000 (Hrs)

Relative Luminance

50 100 (%)

25℃

55℃

70℃

80℃

Hours of Operation

8mA 70℃

14mA 70℃

20mA 70℃

50 100 (%)

1 10 100 1000 10000 100000 (Hrs)

LED Lifetime vs. Drive Current @ Temperature

Relative Luminance

Hours of Operation

Power is not free

Higher power designs are typically more complex, larger &

expensive.

Higher power in the form of heat.

Higher operating temperatures create opportunities for

failure.

Larger mechanical “footprint” dictates larger product

designs.

Additional Comments

Properties of Light

Viewability in High Ambient Light Conditions

Solutions for High Ambient Light Conditions

Technology Overview

Summary

Innovation

Questions?

Challenge:

“In the smart society, obtaining information anywhere one

goes will be typical. Usually it is through a display and

being able to view these information under the sun via a

portable devices or fix stations will require some classes of

displays.”

Solution:

“This class will introduce you to the technologies that are

used to overcome high ambient light conditions, understand

what light can do to displays and what NLT can do to provide

and help solve these problems.”

Do you agree that we accomplished the above statement?

‘Enabling The Smart Society’

Please utilize the ‘Guidebook’ application to leave feedback

or

Ask me for the paper feedback form for you to use…

Please Provide Your Feedback…

Thank You!

Renesas Electronics America Inc.