A display device for a vehicle comprising: a liquid crystal panel displaying an image; a light source for illuminating the liquid crystal panel by light emission; and a controlling means for controlling the liquid crystal panel and the light source, wherein the liquid crystal panel includes: a particular display pixel for displaying a particular image at a particular time; and a normal display pixel for displaying a normal image at a normal time when the particular image is not displayed by the particular display pixel and at the particular time, the controlling means control a ratio of a gradation value of the normal display pixel to a set gradation value of the normal display pixel as a gradation ratio of the normal display pixel, and further control a ratio of a gradation value of the particular display pixel to a set gradation value of the particular display pixel as a gradation ratio of the particular display pixel, characterised in that the display device further comprises a light switch for turning on and off a lamp of the vehicle, whereby an on-off signal from the light switch is input into the controlling means, in a first mode, the controlling means set at least one of the gradation ratio of the normal display pixel and the gradation ratio of the particular display pixel at the particular time to be variable, in a second mode, the controlling means set the gradation ratio of the particular display pixel at the particular time to be larger than the gradation ratio of the normal display pixel, wherein the first mode is switched to the second mode when intensity of light external to the vehicle is lower than a predetermined intensity or light switch turns on the lamp, wherein, at a time of the occurrence of an anomaly in the first mode, the controlling means control the liquid crystal panel to display both of the normal image and the particular image at the same time with the respective maximum allowable levels of lightness, and wherein, at a time of the occurrence of an anomaly in the second mode, the controlling means control the liquid crystal panel to display both of the normal image and the particular image at the same time, wherein the lightness of the normal image is reduced to the occupant's desired lightness, and the lightness of the particular image is kept at the highest level of lightness under an intermediate level of brightness of the light source lower than a highest level of brightness. a liquid crystal panel displaying an image; a light source for illuminating the liquid crystal panel by light emission; and a controlling means for controlling the liquid crystal panel and the light source, wherein the liquid crystal panel includes: a particular display pixel for displaying a particular image at a particular time; and a normal display pixel for displaying a normal image at a normal time when the particular image is not displayed by the particular display pixel and at the particular time, the controlling means control a ratio of a gradation value of the normal display pixel to a set gradation value of the normal display pixel as a gradation ratio of the normal display pixel, and further control a ratio of a gradation value of the particular display pixel to a set gradation value of the particular display pixel as a gradation ratio of the particular display pixel, characterised in that the display device further comprises a light switch for turning on and off a lamp of the vehicle, whereby an on-off signal from the light switch is input into the controlling means, in a first mode, the controlling means set at least one of the gradation ratio of the normal display pixel and the gradation ratio of the particular display pixel at the particular time to be variable, in a second mode, the controlling means set the gradation ratio of the particular display pixel at the particular time to be larger than the gradation ratio of the normal display pixel, wherein the first mode is switched to the second mode when intensity of light external to the vehicle is lower than a predetermined intensity or light switch turns on the lamp, wherein, at a time of the occurrence of an anomaly in the first mode, the controlling means control the liquid crystal panel to display both of the normal image and the particular image at the same time with the respective maximum allowable levels of lightness, and wherein, at a time of the occurrence of an anomaly in the second mode, the controlling means control the liquid crystal panel to display both of the normal image and the particular image at the same time, wherein the lightness of the normal image is reduced to the occupant's desired lightness, and the lightness of the particular image is kept at the highest level of lightness under an intermediate level of brightness of the light source lower than a highest level of brightness.