Please select the most similar patent number from A, B, C and D. Which number is?
A lighting control device for an LED and a fluorescent lamp comprises a human body detector (1), a controller (2), an LED drive circuit (4), a fluorescent lamp drive circuit (6), and an illumination sensor (9). The human body detector (1) is used for detecting whether a human being enters or moves around. The illumination sensor (9) is used for detecting the brightness of a surrounding environment. The LED drive circuit (4) is connected to a k2 of the controller (2) and the K2 controls the switching on/off of the LED drive circuit (4). The fluorescent lamp drive circuit (6) is connected to a k3 of the controller (2) and the K3 controls the switching on/off of the fluorescent lamp drive circuit (6). When the illumination sensor (9) detects that the environment brightness is lower than a preset value D1 and at the same time, the human body detector (1) detects that a human being enters or moves in a detection range, the k3 is switched on. When no human being exists, the k2 is controlled to be switched on and the k3 is switched off. The normal working states of the k2 and the k3 are opposite to each other, but when the two are switched, the k3 is first to be switched on, the k2 is switched off after a time delay, thereby avoiding the phenomenon that the k2 and the k3 are simultaneously switched on and switched off at the same time.
A: An apparatus and method for automatically monitoring a heat source in a home kitchen. The apparatus comprises: a controller (7), and a stepping electric motor control circuit, an infrared detector (1), a stepping electric motor 0° position recognition circuit, a status indicator light (10), a button (9) and a voice circuit, which are connected to the controller (7), wherein the stepping electric motor control circuit is connected to a stepping electric motor (5); and the infrared detector (1) comprises a driving circuit, a dual-element pyroelectric infrared sensor (24), a filter amplifier, a gate screen execution mechanism, and a Fresnel lens (13). The method comprises: by means of data analysis of two states, i.e. human body monitoring and heat source scanning, automatically recognizing an enabled state of a fixed heat source when there is no person in a kitchen, automatically determining a voice playing period according to the radiation intensity of the fixed heat source, and automatically playing voice alarm information. A fixed heat source in a kitchen can be effectively monitored, and intelligent home control over automatically recognizing a situation in which there is a person in a room and a situation in which there is no person in a room can be achieved.
B: An OLED pixel driver circuit and an OLED display device. The OLED pixel driver circuit adopts a 4T1C structure, and is provided with a changeover switch (K), a first pin (K1) of the changeover switch (K) being electrically connected to a drain of a third thin film transistor (T3), a second pin (K2) being electrically connected to a digital-to-analog converter (DAC), a third pin (K3) being electrically connected to an analog-to-digital converter (ADC); said driver circuit controls, by means of a switch signal (Switch), the changeover switch (K) to connect the first pin (K1) and the second pin (K2) so as to enter a display mode, and controls, by means of the switch signal (Switch), the changeover switch (K) to connect the first pin (K1) and the third pin (K3) so as to enter a sensing mode, such that the analog-to-digital converter (ADC) senses a threshold voltage (Vth) of a fourth thin film transistor (T4), which is used, after the analog-to-digital conversion, for data compensation in the display mode. Accordingly, the invention has the compensation function, being able to improve the display uniformity, and improve the aperture ratio of pixels, reducing the manufacturing cost.
C: An apparatus and method for automatically monitoring a heat source in a home kitchen. The apparatus comprises: a controller (7), and a stepping electric motor control circuit, an infrared detector (1), a stepping electric motor 0° position recognition circuit, a status indicator light (10), a button (9) and a voice circuit, which are connected to the controller (7), wherein the stepping electric motor control circuit is connected to a stepping electric motor (5); and the infrared detector (1) comprises a driving circuit, a dual-element pyroelectric infrared sensor (24), a filter amplifier, a gate screen execution mechanism, and a Fresnel lens (13). The method comprises: by means of data analysis of two states, i.e. human body monitoring and heat source scanning, automatically recognizing an enabled state of a fixed heat source when there is no person in a kitchen, automatically determining a voice playing period according to the radiation intensity of the fixed heat source, and automatically playing voice alarm information. A fixed heat source in a kitchen can be effectively monitored, and intelligent home control over automatically recognizing a situation in which there is a person in a room and a situation in which there is no person in a room can be achieved.
D: A photoelectric sensor for automatically adjusting light of a constant-light table lamp. The photoelectric sensor is located on a base of the table lamp. Illuminance of a location point of the photoelectric sensor is approximately equal to average illuminance of a working plane illuminated by the table lamp, and an error is within 30%. The photoelectric sensor comprises: (1) a detection circuit, for detecting whether light of external environment and the luminance and wavelength of the light emitted by the lamp change, converting an optical signal into an electric signal and sending the electric signal to a light adjustment control circuit; (2) the light adjustment control circuit, for analyzing and processing the electric signal sent by the detection circuit, so as to identify whether it is the light of the external environment or the light emitted by the lamp, and if the light of the external environment changes, outputting a control signal to adjust the luminance of the lamp, so that the total luminance, that is, the luminance of the light of the external environment plus the luminance of the light emitted by the lamp, stays within a range required by the user; otherwise, not adjusting the luminance of the lamp. The photoelectric sensor enables the luminance of the lamp to automatically stay in an appropriate range.
Answer: D