Display problen in Directx, the png is blur.....

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C++

C

DirectX

hello, can someone help me with this?
i am new in programming :((

now, i try to use directx for my game
i found the problem that the display picture is blur
screen doesn't show clear image.

first, i compared with my previous program which doesn't have any problems.

i found that my previous program use png with bit depth 32 bit.
so i changed my current program's picture from 24bit to 32bit (bit depth).

it still did not work.
my current program's screen is still blur!! I don't understand why??
please, help me~