* fix: siwtching display, clear last old image 1. Clear last old image. 2. Try refresh after switching display. 3. Add an interval check before refresh video service. Signed-off-by: dignow <linlong1265@gmail.com> * simple changes Signed-off-by: dignow <linlong1265@gmail.com> --------- Signed-off-by: dignow <linlong1265@gmail.com>