Display device with first and second Gamma voltage ranges corresponding to first and second ambient light ranges

A display device, comprising:

• a plurality of light emitting units used to provide a plurality of operating modes, wherein the plurality of operating modes comprise a first operating mode and a second operating mode;
• an ambient light sensor used to detect an ambient light brightness, wherein when the ambient light brightness is in a first ambient light brightness range, the plurality of light emitting units are operated in the first operating mode, wherein when the ambient light brightness is in a second ambient light brightness range, the plurality of light emitting units are operated in the second operating mode, and the ambient light brightness in the first ambient light brightness range is higher than the ambient light brightness in the second ambient light brightness range;
• and
• a Gamma voltage controller electrically connected to the plurality of light emitting units, wherein the Gamma voltage controller comprises a plurality of Gamma voltage groups, and the plurality of Gamma voltage groups comprise a first Gamma voltage group and a second Gamma voltage group;
• a processor electrically connected to the ambient light sensor, wherein the processor is used to determine a target brightness of the display device;
• and
• an emission controller electrically connected to the processor, wherein the emission controller is used to provide an emission duty ratio, wherein the first Gamma voltage group and the second Gamma voltage group are respectively provided to the plurality of light emitting units in the first operating mode and in the second operating mode, the first Gamma voltage group comprises a first voltage and a second voltage respectively corresponding to a lowest gray level and a highest gray level in the first operating mode, the second Gamma voltage group comprises a third voltage and a fourth voltage respectively corresponding to a lowest gray level and a highest gray level in the second operating mode, and an absolute value of a difference between the first voltage and the second voltage is greater than an absolute value of a difference between the third voltage and the fourth voltage,
• wherein the plurality of light emitting units are electrically connected to the Gamma voltage controller and the emission controller, and the plurality of light emitting units are used to receive one of the plurality of Gamma voltage groups and the emission duty ratio,
• wherein the display device has a maximum brightness and a minimum brightness, and the minimum brightness is greater than 0,
• wherein when the target brightness of the display device is the maximum brightness, the plurality of light emitting units are operated in the first operating mode and receive the first Gamma voltage group provided by the Gamma voltage controller, and the emission duty ratio provided by the emission controller is a first emission duty ratio,
• wherein when the target brightness of the display device is the minimum brightness, the plurality of light emitting units are operated in the second operating mode and receive the second Gamma voltage group provided by the Gamma voltage controller, and the emission duty ratio provided by the emission controller is a second emission duty ratio,
• wherein the first emission duty ratio is greater than the second emission duty ratio, and the second emission duty ratio is greater than 0, and
• wherein a range of the target brightness of the display device in the first operating mode and a range of the target brightness of the display device in the second operating mode do not overlap.