 Contents of the improvement
The digit display part of the display unit is made to light up by 1 digit to suppress an electric current. The lighting-up time of 1 digit becomes 1/3 and the light falls. When little flow of the electric current occurs, the color patches occurs to the displaying.
Therefore, I decided to make light up the digits at the same time. But, in case of PIC16F873, at the number of the IO ports, it isn't possible to make all digit light up at the same time. Therefore, I decided to make hold the display data by latch register (74LS273).
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