A color image panel comprising: pixels configured to display a color image, at least one of the pixels including, a tunable photonic crystal filter configured to reflect light in a wavelength band of a selected color and to transmit light in a wavelength band other than the wavelength band of the selected color, based on a stimulus controlling a photonic bandgap of the tunable photonic crystal filter; and a saturation and brightness control unit configured to control saturation and brightness of color light in a wavelength band reflected by the tunable photonic crystal filter by controlling transmission and reflection of external light that is incident on the color image panel; and a controller configured to control the tunable photonic crystal filter and the saturation and brightness control unit, wherein the saturation and brightness control unit comprises: a first shutter on a front side of the tunable photonic crystal filter, the first shutter being configured to tunably control an amount of external light that is incident on the tunable photonic crystal filter from outside; a second shutter on a rear side of the tunable photonic crystal filter, the second shutter being configured to tunably control an amount of light that passes through the second shutter; and a reflection plate that is configured to reflect light that passes through the second shutter back to the second shutter. pixels configured to display a color image, at least one of the pixels including, a tunable photonic crystal filter configured to reflect light in a wavelength band of a selected color and to transmit light in a wavelength band other than the wavelength band of the selected color, based on a stimulus controlling a photonic bandgap of the tunable photonic crystal filter; and a saturation and brightness control unit configured to control saturation and brightness of color light in a wavelength band reflected by the tunable photonic crystal filter by controlling transmission and reflection of external light that is incident on the color image panel; and a controller configured to control the tunable photonic crystal filter and the saturation and brightness control unit, wherein the saturation and brightness control unit comprises: a first shutter on a front side of the tunable photonic crystal filter, the first shutter being configured to tunably control an amount of external light that is incident on the tunable photonic crystal filter from outside; a second shutter on a rear side of the tunable photonic crystal filter, the second shutter being configured to tunably control an amount of light that passes through the second shutter; and a reflection plate that is configured to reflect light that passes through the second shutter back to the second shutter. a first shutter on a front side of the tunable photonic crystal filter, the first shutter being configured to tunably control an amount of external light that is incident on the tunable photonic crystal filter from outside; a second shutter on a rear side of the tunable photonic crystal filter, the second shutter being configured to tunably control an amount of light that passes through the second shutter; and a reflection plate that is configured to reflect light that passes through the second shutter back to the second shutter.