MySQL latin1 to UTF8 site

Hello,

I begin on CI. Before I used PDO to make queries.
The MySQL tables used to have latin1 charset and the site used the utf8 charset meta tag.

When I wanted to insert or retrieve datas there was no problems, without configuration.

Today, with CI I tried some solutions without success, like :

put this in the index.php and let defaults parameters in config/database.php (utf8)

PHP Code:

header('Content-Type: text/html; charset=utf-8', true); 


or

modify config/database.php like this

PHP Code:

$db['default']['char_set'] = 'latin1';
$db['default']['dbcollat'] = 'latin1_swedish_ci'; 


I would like to keep database's charset in latin1 and display datas in UTF8.

Thanks for your help.

PS: Sorry for my bad english.