Often the two most common problems when customers first come into contact with TI DLP® PicoTM display technology are:
♦ How much brightness do I need (measured lumens)?
♦ How much brightness can I achieve in my overall system?
Brightness [1] seems to be a simple technical indicator. But for a particular micro-projection system, how much brightness is needed and how to balance the various aspects of system design when achieving higher brightness is a complex task.
How much brightness do I need?
For a particular terminal device, the brightness required for a miniature projection system depends primarily on three factors:
♦ Screen size (size of projected screen)
♦ Required image brightness (measured in cd/m2 or nits)
♦ Ambient light
In general, the larger the screen size, the higher the brightness required for the image, and the greater the brightness of the projector. In addition, the intensity of ambient light can significantly affect the brightness required for a particular screen size. Considering the factors of the projected picture size and the surrounding ambient light, when designing the whole system using the DLP Pico chip, the user can refer to the projector brightness value suggested in Figure 1 below and the corresponding DLP chipset.
Figure 1: Recommended projector brightness for different image sizes and ambient brightness levels
How much brightness can you achieve?
To answer the question of how much brightness can be achieved, it is important to understand the key variables in Table 1 that can be changed at system design time. To achieve a brighter LED projection solution, it is often necessary to increase some of these variables.
Table 1: Key variables and impacts of the projection system
To better understand these variables, let's take a closer look at an optical module.
Figure 2: Example of an optical module (DLP digital micromirror device [DMD], RGB LEDs, optics, pedestal and LED heatsink)
TI offers a variety of DLP Pico chipsets to third-party companies that design and manufacture optical modules and provide them to system integrators. These optical modules typically include a DMD, a red, green, and blue LED source and a number of optical components. Different optical modules may have different brightness levels depending on the combination of DMD size, LED size and optical design. A specified optical module will also have different brightness depending on the LED power.
If the LED of the optical module is powered and the video content is transferred to the DLP control chip, the optical module will project an image. As shown in Fig. 3, when the power on the LED increases, the brightness increases, but the growth rate becomes slower; at the same time, the heat generation of the LED becomes larger and larger.
Figure 3: How the increase in LED power affects brightness and heat dissipation
TI has recently published an article titled TI DLP Pico System Design: Brightness Requirements and Compromise, which is an in-depth study of this topic. In addition, TI has created a downloadable brightness and projection ratio calculator tool. These complementary resources help developers and brand customers who are integrating DLP Pico technology to better understand these requirements and trade-offs to optimize projection brightness.
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