| 摘要 |
When a gradation voltage corresponding to video data is selected by switching elements, switching noises occur and the image quality reduces. In a planar display device of the present invention, capacitance elements C1, C2, C3, . . . and Cm are respectively connected to resistance elements R1, R2, R3, . . . and Rn, which divide a power source voltage and generate gradation voltages of plural levels. Each capacitance element C is formed in an external substrate 102. With such constitution, the switching noises are absorbed by the capacitance elements C, and propagation of the switching noises to signal lines D is suppressed.
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