LCD LCD Screen Manufacturer Talking about Optical Design of Backlight Display

Backlight is used in small, lightweight electronic devices such as flat-panel liquid crystal display (LCD) with backlighting requirements, including handheld devices as small as palm size, and large screen TV sets. Backlight design objectives include low power consumption, ultra-thin, high brightness, uniform brightness, large area, different width and narrow angle control. In order to achieve these challenging design objectives, control costs and achieve them quickly, computer-aided optical design tools must be used for design. This paper introduces the characteristics of LightTools optical design and analysis software of ORA Company in USA, which can be used to develop the most advanced backlight design applications.

Optical design and analysis tools for backlighting

Backlight illumination systems need to convert light from one or more light sources to produce the required light distribution in an area or at a fixed angle. Lighting design software must be able to model geometrically, set optical characteristic parameters for different types of light sources and conversion units, and must be able to use optical tracing method to evaluate the path of light passing through the model and calculate the final light distribution. The light distribution is simulated by Monte Carlo simulation to calculate illumination, brightness, or luminous intensity of a particular region and/or angle. Light is emitted from the light source at random positions and angles, traced through the optical system, and received on the receiving surface. Illuminance can be calculated from the surface receiver and intensity can be obtained from the far field receiver. By defining a brightness meter on the receiver surface, the distribution of brightness with space and angle can be calculated. In some cases, it may be important to analyze the chroma of the display. Specify the spectral energy distribution of light sources (such as light emitting diodes), output CIE coordinates and relevant color temperature (CCT), quantify the chroma of the display, and generate RGB real-light rendering graphics on the display. These analyses can be done in LightTools software.

The characteristics of backlight display have special requirements for illumination analysis software. As will be explained, the light emitted by the backlight depends on the distribution density of the printing point, or the distribution pattern of the microstructures. For the modeling of specific microstructural arrays, the direct use of CAD models may lead to very large model sizes. LightTools software provides the function of defining three-dimensional texture arrays, which can accurately track and render light. Because there is no geometric model directly constructed, the model is smaller and the ray tracing is faster. Another aspect of backlight analysis includes light scattering and scattering on the surface of the guide plate. Because Monte Carlo method is used to simulate lighting effect, it is possible to use a lot of ray tracing to obtain a design with sufficient precision. The most effective way is to trace the highest energy of light. Tracking the highest energy ray path by using the spectral probability, and directing the scattered light to the "important" direction (e.g. toward the viewer of the display) using the target area of the scattered surface or the scattering angle.

LCD LCD Screen Manufacturer Talking about Optical Design of Backlight Display

Backlight is used in small, lightweight electronic devices such as flat-panel liquid crystal display (LCD) with backlighting requirements, including handheld devices as small as palm size, and large screen TV sets. Backlight design objectives include low power consumption, ultra-thin, high brightness, uniform brightness, large area, different width and narrow angle control. In order to achieve these challenging design objectives, control costs and achieve them quickly, computer-aided optical design tools must be used for design. This paper introduces the characteristics of LightTools optical design and analysis software of ORA Company in USA, which can be used to develop the most advanced backlight design applications.

Optical design and analysis tools for backlighting

Backlight illumination systems need to convert light from one or more light sources to produce the required light distribution in an area or at a fixed angle. Lighting design software must be able to model geometrically, set optical characteristic parameters for different types of light sources and conversion units, and must be able to use optical tracing method to evaluate the path of light passing through the model and calculate the final light distribution. The light distribution is simulated by Monte Carlo simulation to calculate illumination, brightness, or luminous intensity of a particular region and/or angle. Light is emitted from the light source at random positions and angles, traced through the optical system, and received on the receiving surface. Illuminance can be calculated from the surface receiver and intensity can be obtained from the far field receiver. By defining a brightness meter on the receiver surface, the distribution of brightness with space and angle can be calculated. In some cases, it may be important to analyze the chroma of the display. Specify the spectral energy distribution of light sources (such as light emitting diodes), output CIE coordinates and relevant color temperature (CCT), quantify the chroma of the display, and generate RGB real-light rendering graphics on the display. These analyses can be done in LightTools software.

The characteristics of backlight display have special requirements for illumination analysis software. As will be explained, the light emitted by the backlight depends on the distribution density of the printing point, or the distribution pattern of the microstructures. For the modeling of specific microstructural arrays, the direct use of CAD models may lead to very large model sizes. LightTools software provides the function of defining three-dimensional texture arrays, which can accurately track and render light. Because there is no geometric model directly constructed, the model is smaller and the ray tracing is faster. Another aspect of backlight analysis includes light scattering and scattering on the surface of the guide plate. Because Monte Carlo method is used to simulate lighting effect, it is possible to use a lot of ray tracing to obtain a design with sufficient precision. The most effective way is to trace the highest energy of light. Tracking the highest energy ray path by using the spectral probability, and directing the scattered light to the "important" direction (e.g. toward the viewer of the display) using the target area of the scattered surface or the scattering angle.