A display apparatus comprising: an image processing unit configured to process an image signal; and a display unit comprising a display panel configured to display an image based on the image signal, the display panel comprising: a substrate having a flat panel shape; a semiconductor layer comprising a plurality of switching elements arranged in a matrix form and associated with a plurality of pixels, each pixel defined by a corresponding pixel region (66; 67; 68) that represents an area where light is transmitted through, a plurality of lines arranged to extend across the semiconductor layer and to transmit the driving signal to the plurality of switching elements, and a light output layer disposed on the semiconductor layer and outputting light by an electrical drive; wherein the switching elements are arranged to perform switching based on a driving signal to drive the light output layer, wherein at least one of the lines has a width at a central portion larger than widths at both its ends, wherein the width of the at least one of the lines gradually increases in the lengthwise direction from both its ends to the central portion such that the Size of the corresponding pixel region gradually decreases from both end portions to the central portion, wherein the at least one of the lines is configured to receive the driving signal from both ends thereof, wherein the display unit further comprises a light source unit configured to provide light and a light guide plate configured to guide the light provided from the light source unit to be emitted to the display panel, and wherein the light guide plate comprises a pattern to compensate for variations in light transmittance through the pixel regions due to difference in the width of the at least one of the lines. an image processing unit configured to process an image signal; and a display unit comprising a display panel configured to display an image based on the image signal, the display panel comprising: a substrate having a flat panel shape; a semiconductor layer comprising a plurality of switching elements arranged in a matrix form and associated with a plurality of pixels, each pixel defined by a corresponding pixel region (66; 67; 68) that represents an area where light is transmitted through, a plurality of lines arranged to extend across the semiconductor layer and to transmit the driving signal to the plurality of switching elements, and a light output layer disposed on the semiconductor layer and outputting light by an electrical drive; wherein the switching elements are arranged to perform switching based on a driving signal to drive the light output layer, wherein at least one of the lines has a width at a central portion larger than widths at both its ends, wherein the width of the at least one of the lines gradually increases in the lengthwise direction from both its ends to the central portion such that the Size of the corresponding pixel region gradually decreases from both end portions to the central portion, wherein the at least one of the lines is configured to receive the driving signal from both ends thereof, wherein the display unit further comprises a light source unit configured to provide light and a light guide plate configured to guide the light provided from the light source unit to be emitted to the display panel, and wherein the light guide plate comprises a pattern to compensate for variations in light transmittance through the pixel regions due to difference in the width of the at least one of the lines. a substrate having a flat panel shape; a semiconductor layer comprising a plurality of switching elements arranged in a matrix form and associated with a plurality of pixels, each pixel defined by a corresponding pixel region (66; 67; 68) that represents an area where light is transmitted through, a plurality of lines arranged to extend across the semiconductor layer and to transmit the driving signal to the plurality of switching elements, and a light output layer disposed on the semiconductor layer and outputting light by an electrical drive; wherein the switching elements are arranged to perform switching based on a driving signal to drive the light output layer, wherein at least one of the lines has a width at a central portion larger than widths at both its ends, wherein the width of the at least one of the lines gradually increases in the lengthwise direction from both its ends to the central portion such that the Size of the corresponding pixel region gradually decreases from both end portions to the central portion, wherein the at least one of the lines is configured to receive the driving signal from both ends thereof, wherein the display unit further comprises a light source unit configured to provide light and a light guide plate configured to guide the light provided from the light source unit to be emitted to the display panel, and wherein the light guide plate comprises a pattern to compensate for variations in light transmittance through the pixel regions due to difference in the width of the at least one of the lines.