Substantially reduced size automotive LCD/display bias solution
Design work for automotive LCD displays that are more than 5 inches can be very complex. The display source driver requires a supply rail with a voltage range of 10V to 15V, referred to as the analog voltage device drain (AVDD), and two power rails (VGH and VGL) for the gate driver.
In many cases, you can use an LCD bias power supply such as the TPS65150-Q1 (a automotive LCD/display bias solution for infotainment or clustered displays that greatly simplifies your LCD power supply design). But there is another way to design an automotive LCD display that can be further reduced in size and saves bill of materials (BOM) costs by using fewer source drivers.
Figure 1: Traditional LCD bias power supply method using TPS65150-Q1
In order to follow the trend of designing for smartphones and tablet displays (see TPS65132 for a single inductor-based split-rail converter TPS65132) for about three years ago, a new approach to driving has emerged in the automotive industry – source The pole driver now requires a positive AVDD (6.xV) rail and a negative AVDD (-6.xV) rail.
Figure 2: A new approach using a single inductor (based on a split-rail converter such as the TPS65132)
Both panel manufacturers and source driver manufacturers favor this technique of reducing display power consumption by using charge sharing. In addition, this new approach saves money and downsizing because the source driver controls more channels, reducing the number of source drivers required for each display.
Designed for display power management (requires +/-AVDD drive), you can further simplify your design with the TPS65131-Q1, an efficient split-rail converter for automotive applications. This flexible device includes a separate EN pin for fully adjustable sequencing and a resistor divider for setting the output voltage to provide +AVDD and -AVDD supply rails for the source driver.
For designs where the source driver does not integrate VGH and VGL rails, installing a charge pump and an inverting charge pump that support those rails will complement the power rail provided by the TPS65131-Q1. For information on how to install and enable these power rails and how you can make them suitable for your next design, please refer to this TI Designs Reference Design (PMP9780).
Which type of car display would you use a split-rail converter?
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Take a look at this split track overview video.
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