Core technologies

Low power consumption

Electricity generated by solar cell generator

Divisions	Optical fiber	LED	Internal lighting
Maximization of light transmission efficiency	93%	–	15%
LED pixel maximization per element	50 pixel	1 pixel	–
Concentration of light intensity in the operating viewing angle (standard / effective)	60 ̊ / 40	70	180

The greater the contrast of the pattern vs the background, the better night visibility / readability
In the case of luminescent safety signs, black background is recommended (US Federal Road Administration)
The ratio of internal lighting patterns and background illumination is regulated to be from 10: 1 to 20: 1 (US Federal Road Administration)

LED array, shape of optical fiber holder, and optical fiber cutting are optimized→ minimization of LED quantity
Current control → LED temperature maintenance → LED internal resistance maintenance → overcurrent shutdown
Minimized power consumption of control system itself → improvement of electric consumption efficiency by 30%

DIVISIONS	LUMINESCENT OPTICAL FIBER TYPE SIGN (1000x1000)	LED SIGN (1000x1000)	LED SIGNBOARD (1000x1000)	INTERNAL LIGHTING SIGN (Φ900 circle)	REMARKS
luminescence types	LED+Optical fiber	LED protrusion	LED and module combination	LED Backlight	-
Power Consumption	1.5w (high)	10W (middle)*	393W/180W(low)**	36W (low)	Φ5 LED 25mm spacing Single line basis ** 100% / 50% on
Solar power application (Solar / battery capacity)	10W / 12Ah (high)	70W / 100Ah (middle)	1,190W / 1,470Ah (low)	200W / 300Ah (low)	14 hr / day for 7 sunless days * 180W standard
Electricity facility cost	Solar (solar electron) type No electricity required No restrictions on installation location	400,000won per electricity input 50m / When exceeding 60,000won per 1m			-
Electricity charges	No	Yes			-
Stability	DC 12V usage. No risk of electric shock	AC 220V usage. In case of rainy weather or construction work, it is necessary to take measures against electric shock			-
Night images

Optical fiber pattern illumination

Acquisition of optimal luminescence quality

Narrow angle → suppression of diffused emission (distant luminous flux drop) → Superior long-range visibility and readability
Limitation of lateral illumination → No unnecessary information disclosure to unauthorized drivers (especially regulatory signs)
Strong straightness → Transmission of precise information regardless of condensation / fog / rain
Repeated total reflection inside the optical fiber during light transmission → Minimize driver’s visual stimulus

Fine line / surface array of optical fiber → Optimized layout design → Transmission of clear sign information
Small surface area (1Φ) per pixel → Low surface tension → Maintains bright illumination even with severe contamination
Specialized luminous system for signs→ Differentiated from commercial signs → High discrimination power / attraction

Selection of LED elements → Optical / electrical optimization of light source → Prevention of deterioration of brightness / color in time
Accurate LED array → Minimize light intensity deviation between pixels → High quality homogeneous line / surface illumination
Stimulating LED direct rays are dispersed to multiple pixels→ solution for dazzling / light blurring

Source: Traffic Data Book 2005-1 Volume 15, Luminescent type traffic safety sign using optical fiber and solar cell’ (Road Traffic Authority / Traffic Science Institute)
Viewing distance: 200 ~ 250m more than existing signs (2.1 ~ 2.2 times)
Reading distance: 60 ~ 150m more than existing signs (1.5 ~ 2.5 times)

Light source / Light emitting part dualization

Acquisition of electrical / physical durability

Electric flow (battery ~ LED socket) and light flow (optical fiber bundle ~ sign pixels) dualization
The sign frame and the light emitting part (optical fiber) are physically bonded (integration)
→ the possibility of failure in the light emitting system within the life of optical fiber is rare (20 years)
LED socket internalization → external UV / heat / moisture / vibration prevention → LED function retention

Minimize the LED quantity under the same lighting condition → Solution for heat damage due to increase of LED quantity
Selection of LED devices → Prevention of irregular overcurrent → Long life of LED
Focusing on one bundle of multi-pixel optical fibers → Preventing distortion of sign information by gap

Specialized overcharge / overdischarge / backflow prevention → Maintain optimal life of battery and solar module
Current input is fine-tuned by each LED → LED driving maintains constant → LED life optimization
Minimize system maintenance power / Adopt active heat dissipation structure of circuit part → Stable electric control
Self-program based electrical system control → Current / voltage flow optimization of each component

Maintenance-fit product design

Maintenance realization

Physical integration structure of sign and optical fiber → Sufficient tolerance for UV / heat / moisture / vibration
Fiber optic material life expectancy over 20 years → more than usual sign life (up to 12 years)
Electrical maintenance of the light emitting system is unnecessary → Preventing disassembly of signs and frames

Complex light emitting part (optical fiber bundle ~ sign optical fiber holder) vs simple electric part (LED socket ~battery)
→ The maintenance range is limited to electric part
Concentration of inspection window of optical fiber bundle → Simplification of LED socket replacement (5 ~ 10 years cycle) through inspection window
Simple LED socket design → Minimized difficulty and time required for LED socket replacement work

Separation and dualization of light source and control box → Concentration of control box of battery, control system, etc.
External independent installation (pillar) of control box → Easy battery replacement (2 to 4 year cycle)
Replace IC when upgrading control system → Actively cope with weather change and technological progress