The flag of which country does not consist of a solid background with a single circle on it?

The flag of Laos consists of three horizontal stripes, the middle stripe in blue and the top and bottom are red stripes. In the middle is a white disc, the diameter of the disc is  4⁄5 the height of the blue stripe. The flag ratio is 2:3. The national flag of Laos was first adopted in 1945 under the short-lived Lao Issara government of 1945–46, then by the Pathet Lao.

The national flag of Bangladesh consists of a red disc on top of a green field, offset slightly toward the hoist so that it appears centred when the flag is flying. The red disc represents the sun rising over Bengal, and also the blood of those who died for the independence of Bangladesh. The green field stands for the lushness of the land of Bangladesh.

The national flag of Japan is a white rectangular flag with a red disc in the center. This flag is officially called Nisshōki in the Japanese language, but is more commonly known as Hi no maru ("circle of the sun"). The flag embodies Japan's nickname as the Land of the Rising Sun.

The flag of Palau has a blue background colour used to represent the ocean and the nation's place within it. The disc on the flag (similar to that on Japan's flag) is off-centre like that of the flag of Bangladesh, but in this case represents the moon instead of the sun.