Display panel and display device

A display device, comprising:

• a display panel, comprising:
• a plurality of sub-pixels formed by a plurality of scan lines intersecting a plurality of data lines, the plurality of sub-pixels being arranged in a matrix, each of the sub-pixels comprising a pixel electrode, the plurality of sub-pixels being divided into a first sub-pixel type, a second sub-pixel type, a third sub-pixel type and a fourth sub-pixel type, each type of sub-pixels being configured to display a different color, wherein,
• each sub-pixel of the first-sub-pixel type, the second-sub-pixel type, the third-sub-pixel type and the fourth-sub-pixel type comprises an aperture region allowing light to pass through and a non-aperture region where light cannot pass through,
• an area of an aperture region of each sub-pixel of the fourth-sub-pixel types is smaller than an area of an aperture region of any sub-pixel of the first-sub-pixel type, the second-sub-pixel type and the third-sub-pixel type,
• the plurality of sub-pixels are divided into a plurality of pixel groups, each of the pixel groups comprises four of the sub-pixels, one of the four sub-pixels in each of the pixel groups is the fourth sub-pixel type, each of the pixel groups further comprises at least two display elements, each of the display elements is associated with one of the sub-pixels in the pixel group, and the at least two display elements are disposed within the non-aperture region of the fourth sub-pixel type, and
• each pixel group has a T shape in which a third-type sub-pixel and a first-type sub-pixel are positioned adjacent to a fourth-type sub-pixel in a row direction, a second-type sub-pixel is positioned adjacent to the fourth-type sub-pixel in a column direction, and four thin film transistors for respectively driving the four sub-pixels are disposed in the non-aperture region of the fourth-type sub-pixel, sources and gates of the four thin film transistors are connected to various data lines and scan lines, and drain electrodes of the four thin film transistors are connected to pixel electrodes of the four sub-pixels respectively,
• wherein the gates of the thin film transistors are in a hollow squared shape,
• wherein heads of the T shapes of adjacent pixel groups are orientated towards opposite directions;
• and
• wherein in each pixel group, each of the display elements is a data-line leading hole;
• and the source electrode of the thin film transistor is electrically connected to one data line through the data-line leading hole.