I don't think it's the display issue....I think it's the ambient light deal...I mean,when the Sun is on the display,the graphics show up great.Like they're illuminated.It's when it hits a particular shadowing....that's when it looses it's brilliance.The Brightness deal is for the RED illuminators on the tach,and also at night.Don't think it has anything to do with the display brightness during daylight.It will automatically adjust as the light hits it certain ways.
Don't know if that R1 is similar....darkening at particular light inputs.All I really need to see,if anything,is the speedo and gear.The tach is very visible always.