DLPU115 User guide | 德州仪器 TI.com.cn

DLPU115 January 2022 DLPC3421

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3.1.20.3 Use of Image Freeze to Reduce On-Screen Artifacts

Commands that take a long time to process, require a lot a data to be loaded from flash, or change the frame timing of the system may create on-screen artifacts. The Write Image Freeze command can try and minimize, if not eliminate, these artifacts. The process is:

Send a Write Image Freeze command to enable freeze.
Send commands with the potential to create image artifacts.
Embedded software executes Write Image Freeze command to disable freeze.

Because commands to the controller process serially, no special timing or delay is required between these commands. The number of commands placed between the freeze and unfreeze must be small, as it is not desirable for the image to be frozen for a long period of time. A list of commands that may produce image artifacts is listed in Table 3-18, which is not an all-inclusive list. The user is responsible for determining the correct use of the image freeze command.

Table 3-18 Partial List of Commands that May Benefit from the Use of Image Freeze

Command	Command OpCode	Notes
Write Input Source Select	05h
Write External Video Source Format Select	07h	If changed while this source is the active source, embedded software disables image freeze after this command is executed
Write Test Pattern Select	0Bh	If changed while this source is the active source
Write Splash Screen Select	0Dh	If changed while this source is the active source, embedded software disables image freeze after this command is executed
Write Look Select	22h

Table 3-19 and Table 3-20 show a few examples of how to use the image freeze command.

Table 3-19 Splash Screen Example Using Image Freeze

Command	Notes
Write Display Image Curtain = enable	May want to apply curtain if already displaying an unwanted image (such as a broken source)
Write Image Freeze = freeze
Write Image Crop, Write Display Size, Write Display Image Orientation	Potential data processing commands that may be required for proper display of splash image. These must be set prior to write splash screen execute command to affect the splash screen image.
Write Splash Screen Select Write Input Source Select = splash	These must be set prior to write splash screen execute
Write Splash Screen Execute	Retrieves the desired splash screen image for display

The new splash image displays when the Write Splash Screen Execute command executes, regardless of the state of the Write Image Freeze command (due to the one time nature of the splash image). Embedded software disables image freeze after this command is executed.

Table 3-20 Test Pattern Generator Example Using Image Freeze

Command	Notes
Write Image Freeze = freeze
Write Image Crop, Write Display Size, Write Display Image Orientation, Write Test Pattern Select	Potential data processing commands that may be required for proper display of test pattern image. These must be set before the Write Input Source Select command.
Write Input Source Select = test pattern generator
Write Image Freeze = unfreeze