Display brightness control apparatus and electronic device
The present disclosure relates to display brightness control apparatuses and electronic devices. The display brightness control apparatus can be applied to a display panel. The display panel includes a thin film transistor unit and a light emitting unit. The display brightness control apparatus includes: a detector, which includes a plurality of thin-film transistors in the thin-film transistor unit and is used for outputting a detection current according to the brightness of ambient light; and a controller electrically connected to the detector and used for controlling the luminous brightness of the light-emitting unit according to the detection current. The detector is realized by means of the thin-film transistors, and is arranged inside the thin-film transistor unit of the display panel. The photosensitive characteristic of the thin-film transistors is used to detect the brightness of the ambient light.
1. A display brightness control apparatus, applied to a display panel, the display panel comprising a thin film transistor device and a light emitting device, the apparatus comprising:
a detector, comprising a plurality of thin film transistors in the thin film transistor device, and configured to output a detection current according to brightness of ambient light, wherein the detector comprises one or more detection circuits; and
a controller, electrically connected to the detector, and configured to control luminous brightness of the light emitting device according to the detection current, wherein the controller is configured to control the luminous brightness of the light emitting device according to the detection current by operations comprising obtaining a first control signal according to the detection current outputted by the one or more detection circuits to control the luminous brightness of the light emitting device,
wherein at least one of the one or more detection circuits comprises a first diode, a first capacitor, a second capacitor, a first switch, and a second switch, wherein:
a negative end of the first diode is electrically connected to a first end of the first switch and a first end of the first capacitor, a second end of the first switch is electrically connected to a first end of the second switch and a first end of the second capacitor, a control end of the first switch, a control end of the second switch, and a second end of the second switch are electrically connected to the controller, and a positive end of the first diode, a second end of the first capacitor, and a second end of the second capacitor are grounded, and
wherein the first diode comprises a plurality of thin film transistors connected in parallel, or
wherein at least one of the one or more detection circuits comprises 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 controller, 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 controller, and 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, and
wherein the second diode and the third diode each comprises a plurality of thin film transistors connected in parallel, and the third diode is arranged not to be irradiated by the ambient light.
2. The apparatus according to claim 1 , wherein the controller comprises a first operational amplifier, a third capacitor, a third switch, and a first controller, wherein:
a first input end of the first operational amplifier is electrically connected to a second end of the second switch, a first end of the third capacitor, and a first end of the third switch, a second input end of the first operational amplifier is used to input a reference signal, an output end of the first operational amplifier is electrically connected to a second end of the third capacitor, a second end of the third switch, and the first controller, and a control end of the third switch is electrically connected to the first controller;
the first controller is configured to:
control the detector to obtain the detection current by operations comprising controlling on states of the first switch, the second switch, and the third switch through the control end of the first switch, the control end of the second switch, and the control end of the third switch; and
obtain the first control signal according to the detection current.
3. The apparatus according to claim 2 , wherein controlling the on states of the first switch, the second switch, and the third switch through the control end of the first switch, the control end of the second switch, and the control end of the third switch comprises:
during a first time period when a detection starts, closing the first switch and the third switch, and opening the second switch; and
when the first time period is reached, closing the second switch, and opening the first switch and the third switch.
4. The apparatus according to claim 1 , wherein the controller comprises a second operational amplifier, a fourth capacitor, a sixth switch, and a second controller, wherein:
a first input end of the second operational amplifier is electrically connected to the second end of the fourth switch and a drain of the second transistor, a second input end of the second operational amplifier is used to input a reference signal, an output end of the second operational amplifier is electrically connected to a second end of the fourth capacitor, a second end of the sixth switch, and the second controller, and a control end of the sixth switch is electrically connected to the second controller;
the second controller is configured to:
control the detector to obtain the detection current by operations comprising controlling on states of the fourth switch, the fifth switch, and the sixth switch through the control end of the fourth switch, the control end of the fifth switch, and the control end of the sixth switch, so as to; and
obtain the first control signal according to the detection current.
5. The apparatus according to claim 4 , wherein controlling the on states of the fourth switch, the fifth switch, and the sixth switch through the control end of the fourth switch, the control end of the fifth switch, and the control end of the sixth switch comprises:
during a second time period when a detection starts, closing the sixth switch, and opening the fourth switch and the fifth switch; and
when the second time period is reached, closing the fourth switch and the fifth switch, and opening the sixth switch.
6. The apparatus according to claim 1 , wherein the controller is arranged in at least one of a touch and display driver integration chip, a fingerprint touch and display driver integration chip, or a fingerprint and display driver integration chip.
7. An electronic device, comprising a display brightness control apparatus and a display panel, wherein the display panel comprises a thin film transistor device and a light emitting device, and the display brightness control apparatus is applied to the display panel and comprises:
a detector, comprising a plurality of thin film transistors in the thin film transistor device, and configured to output a detection current according to brightness of ambient light, wherein the detector comprises one or more detection circuits; and
a controller, electrically connected to the detector, and configured to control luminous brightness of the light emitting device according to the detection current, wherein the controller is configured to control the luminous brightness of the light emitting device according to the detection current by operations comprising obtaining a first control signal according to the detection current outputted by the one or more detection circuits to control the luminous brightness of the light emitting device,
wherein at least one of the one or more detection circuits comprises a first diode, a first capacitor, a second capacitor, a first switch, and a second switch, wherein:
a negative end of the first diode is electrically connected to a first end of the first switch and a first end of the first capacitor, a second end of the first switch is electrically connected to a first end of the second switch and a first end of the second capacitor, a control end of the first switch, a control end of the second switch, and a second end of the second switch are electrically connected to the controller, and a positive end of the first diode, a second end of the first capacitor, and a second end of the second capacitor are grounded, and
wherein the first diode comprises a plurality of thin film transistors connected in parallel, or
wherein at least one of the one or more detection circuits comprises 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 controller, 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 controller, and 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, and
wherein the second diode and the third diode each comprises a plurality of thin film transistors connected in parallel, and the third diode is arranged not to be irradiated by the ambient light.
8. The electronic device according to claim 7 , wherein the controller comprises a first operational amplifier, a third capacitor, a third switch, and a first controller, wherein:
a first input end of the first operational amplifier is electrically connected to a second end of the second switch, a first end of the third capacitor, and a first end of the third switch, a second input end of the first operational amplifier is used to input a reference signal, an output end of the first operational amplifier is electrically connected to a second end of the third capacitor, a second end of the third switch, and the first controller, and a control end of the third switch is electrically connected to the first controller;
the first controller is configured to:
control the detector to obtain the detection current by operations comprising controlling on states of the first switch, the second switch, and the third switch through the control end of the first switch, the control end of the second switch, and the control end of the third switch; and
obtain the first control signal according to the detection current.
9. The electronic device according to claim 8 , wherein controlling the on states of the first switch, the second switch, and the third switch through the control end of the first switch, the control end of the second switch, and the control end of the third switch comprises:
during a first time period when a detection starts, closing the first switch and the third switch, and opening the second switch; and
when the first time period is reached, closing the second switch, and opening the first switch and the third switch.
10. The electronic device according to claim 7 , wherein the controller comprises a second operational amplifier, a fourth capacitor, a sixth switch, and a second controller, wherein:
a first input end of the second operational amplifier is electrically connected to the second end of the fourth switch and a drain of the second transistor, a second input end of the second operational amplifier is used to input a reference signal, an output end of the second operational amplifier is electrically connected to a second end of the fourth capacitor, a second end of the sixth switch, and the second controller, and a control end of the sixth switch is electrically connected to the second controller;
the second controller is configured to:
control the detector to obtain the detection current by operations comprising controlling on states of the fourth switch, the fifth switch, and the sixth switch through the control end of the fourth switch, the control end of the fifth switch, and the control end of the sixth switch; and
obtain the first control signal according to the detection current.
11. The electronic device according to claim 10 , wherein controlling the on states of the fourth switch, the fifth switch, and the sixth switch through the control end of the fourth switch, the control end of the fifth switch, and the control end of the sixth switch comprises:
during a second time period when a detection starts, closing the sixth switch, and opening the fourth switch and the fifth switch; and
when the second time period is reached, closing the fourth switch and the fifth switch, and opening the sixth switch.
12. The electronic device according to claim 7 , wherein the controller is arranged in any one of a touch and display driver integration chip, a fingerprint touch and display driver integration chip, or a fingerprint and display driver integration chip.
13. The electronic device according to claim 7 , wherein the display panel comprises at least one of a liquid crystal display panel, a light-emitting diode display panel, an organic light-emitting diode display panel, or a micro-light-emitting diode display panel.