i.MX ProcessorsのトピックRe: i.mx51 display driver has function Screen off?

i.mx51 display driver has function Screen off?

oogata — Thu, 28 Mar 2013 01:44:51 GMT

Hi All!

I am working on i.mx51 customized board.

I am worried about LCD Burn-In. I would like to screen off.

Please tell me, In Windows CE 6.0 Freescale BSP, the Display Driver, or would have been implemented function screen off?

Thank you,

Ogata

Re: i.mx51 display driver has function Screen off?

jimmychan — Tue, 02 Apr 2013 01:37:04 GMT

According to the i.MX51 WinCE6 BSP Reference manual 8.4.4.3 IOCTL_POWER_SET,

The display driver implements the IOCTL_POWER_SET IOCTL API with support for the D0 (Full On) and D4 (Off) power states. These states are handled in the following manner:

• D0—The display panel is enabled. The IPUv3 DI and DC modules are enabled to send data to thedisplay. If video is active, additional submodules may also be enabled to process and convert video data. If TV output mode is active, enable the TVE module and its clocks.

• D4—The DI and DC submodules of the IPUv3 are disabled. The display panel is disabled. If TV output mode was enabled, disable the TVE and its clocks.

Have you try this?

Re: i.mx51 display driver has function Screen off?

oogata — Tue, 02 Apr 2013 02:17:39 GMT

Thanks for your reply, jimmy.

I'll try "IOCTL_POWER_SET, D4".

I have heard that the cause of LCD-burn-in is long time displaying of same contents.

BSP Reference manual 8.4.4.3 ,wrote

"The DI and DC submodules of the IPUv3 are disabled."

Are "the IPUv3 are disabled" mean that to stop the display ?

Re: i.mx51 display driver has function Screen off?

jimmychan — Tue, 02 Apr 2013 02:27:50 GMT

"The DI and DC submodules of the IPUv3 are disabled.". It is means DI and DC ( the submodules in the IPUv3) disable, not the whole IPUv3 module disable.