A display brightness control apparatus, wherein the display brightness control apparatus is applied to a display panel, the display panel includes a thin film transistor unit and a light emitting unit, and the display brightness control apparatus comprises: a detection module, including a plurality of thin film transistors in the thin film transistor unit, and configured to output a detection current according to brightness of ambient light; and a control module, electrically connected to the detection module, and configured to control luminous brightness of the light emitting unit according to the detection current; wherein the detection module includes one or more detection units, and to control the luminous brightness of the light emitting unit according to the detection current includes: obtaining a first control signal according to the detection current outputted by the one or more detection units to control the luminous brightness of the light emitting unit, characterized in that the detection unit includes a second diode, a third diode, a fourth switch, a fifth switch, a first transistor, and a second transistor, wherein a positive end of the second diode is electrically connected to a first end of the fourth switch, and a second end of the fourth switch is electrically connected to a drain of the second transistor and the control module, a positive end of the third diode is electrically connected to a first end of the fifth switch, and a second end of the fifth switch is electrically connected to a drain of the first transistor, a gate of the first transistor, and a gate of the second transistor, a control end of the fourth switch and a control end of the fifth switch are electrically connected to the control module, a negative end of the second diode, a negative end of the third diode, a source of the first transistor, and a source of the second transistor are grounded, wherein the second diode and the third diode each includes a plurality of thin film transistors connected in parallel, the second diode is arranged to sense the brightness of the ambient light and the third diode is arranged not to be irradiated by the ambient light. wherein the display brightness control apparatus is applied to a display panel, the display panel includes a thin film transistor unit and a light emitting unit, and the display brightness control apparatus comprises: a detection module, including a plurality of thin film transistors in the thin film transistor unit, and configured to output a detection current according to brightness of ambient light; and a control module, electrically connected to the detection module, and configured to control luminous brightness of the light emitting unit according to the detection current; a detection module, including a plurality of thin film transistors in the thin film transistor unit, and configured to output a detection current according to brightness of ambient light; and a control module, electrically connected to the detection module, and configured to control luminous brightness of the light emitting unit according to the detection current; wherein the detection module includes one or more detection units, and to control the luminous brightness of the light emitting unit according to the detection current includes: obtaining a first control signal according to the detection current outputted by the one or more detection units to control the luminous brightness of the light emitting unit, characterized in that the detection unit includes a second diode, a third diode, a fourth switch, a fifth switch, a first transistor, and a second transistor, wherein a positive end of the second diode is electrically connected to a first end of the fourth switch, and a second end of the fourth switch is electrically connected to a drain of the second transistor and the control module, a positive end of the third diode is electrically connected to a first end of the fifth switch, and a second end of the fifth switch is electrically connected to a drain of the first transistor, a gate of the first transistor, and a gate of the second transistor, a control end of the fourth switch and a control end of the fifth switch are electrically connected to the control module, a negative end of the second diode, a negative end of the third diode, a source of the first transistor, and a source of the second transistor are grounded, wherein the second diode and the third diode each includes a plurality of thin film transistors connected in parallel, the second diode is arranged to sense the brightness of the ambient light and the third diode is arranged not to be irradiated by the ambient light.