CN114420047B - Display screen, display screen control method and terminal - Google Patents
Display screen, display screen control method and terminal Download PDFInfo
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- CN114420047B CN114420047B CN202011173628.3A CN202011173628A CN114420047B CN 114420047 B CN114420047 B CN 114420047B CN 202011173628 A CN202011173628 A CN 202011173628A CN 114420047 B CN114420047 B CN 114420047B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The display screen comprises a substrate, a TFT layer, an OLED layer, a distance sensor and a controller, wherein the TFT layer is covered on the substrate, the OLED layer is covered on the TFT layer, the distance sensor is arranged below the substrate, the controller is connected with the distance sensor, and the controller is used for adjusting the energy density and/or the emission time of infrared light signals emitted by the distance sensor when the distance sensor emits the infrared light signals, so that the TFT layer is not sensitized, the TFT layer can be prevented from generating a photosensitive current under the stimulation of the infrared light signals emitted by the distance sensor, the current mutation for controlling the OLED layer to emit light is avoided, screen light spots are eliminated, the service life of a screen is effectively prolonged, and the user experience is improved.
Description
Technical Field
The disclosure relates to the technical field of display screens, and in particular relates to a display screen, a display screen control method and a terminal.
Background
The mobile terminal occupies a great share of the electronic product market by virtue of the powerful function, the display screen is used as an indispensable man-machine interaction tool of the mobile terminal, and the actual experience of a user is directly influenced by the performance. The full screen gains wide consumer popularity by virtue of a beautiful appearance and a better visual experience.
Generally, in the case of a mobile terminal adopting a full-screen design, a Proximity Sensor (psnsor) must be designed under the screen, however, when the psnsor is designed under the screen, when the psnsor emits a detection signal, a spot on the screen (i.e. a pixel with a sudden brightness change in a screen image) is often excited, which not only damages the screen, but also affects the actual experience of the user.
Disclosure of Invention
The purpose of the present disclosure is to provide a display screen, a display screen control method and a terminal.
To achieve the above object, a first aspect of the present disclosure provides a display screen, including: the device comprises a substrate, a TFT layer, an OLED layer, a distance sensor and a controller, wherein the TFT layer is covered on the substrate, the OLED layer is covered on the TFT layer, the distance sensor is arranged below the substrate, the controller is connected with the distance sensor, and the distance sensor is used for emitting infrared light signals under the condition of receiving driving signals and determining whether a shielding object exists according to the receiving result of the infrared light signals;
the controller is used for controlling the TFT layer to be turned off under the condition that the shielding object is determined to exist, so that the OLED layer is turned off, and controlling the TFT layer to be turned on under the condition that the shielding object is determined to not exist, so that the OLED layer emits light;
the controller is further used for adjusting the energy density and/or the emission time of the infrared light signal emitted by the distance sensor when the infrared light signal is emitted by the distance sensor, so that the TFT layer is not sensitive to light.
Optionally, the controller is configured to: and under the condition that the TFT layer is turned on, controlling the distance sensor to transmit the infrared light signal according to a first preset transmitting power, and under the condition that the TFT layer is turned off, controlling the distance sensor to transmit the infrared light signal according to a second preset transmitting power, wherein the first preset transmitting power is smaller than the second preset transmitting power so as to reduce the energy density of the distance sensor to transmit the infrared light signal.
Optionally, the controller is configured to: under the condition that the TFT layer is conducted, the distance sensor is controlled to emit the external red light signal according to a first preset emission frequency; under the condition that the TFT layer is cut off, the distance sensor is controlled to emit the external red light signal according to a second preset emission frequency; the first preset frequency is larger than the second preset power so as to shorten the light emitting duration of the infrared light signal emitted by the distance sensor once.
Optionally, the controller is configured to: under the condition that a screen light-emitting signal is received, after a preset time is delayed, the TFT layer is controlled to be conducted, and in the time delay process, the distance sensor is controlled to emit the infrared light signal, and the screen light-emitting signal is used for indicating the OLED layer to emit light so as to change the light-emitting time of the distance sensor to emit the infrared light signal.
Optionally, the controller is configured to: and continuously stopping the TFT layer for a second target time period every first target time period, and controlling the distance sensor to emit the infrared light signal in the second target time period so as to change the light emitting time of the distance sensor for emitting the infrared light signal.
Optionally, the distance sensor comprises a signal transmitting device and a signal receiving device, wherein the signal transmitting device comprises an infrared transmitting tube driving circuit and a plurality of infrared transmitting tubes, and the plurality of infrared transmitting tubes are connected in series and then connected with the infrared transmitting tube driving circuit;
the signal transmitting device is used for transmitting infrared light signals under the condition of receiving the driving signals;
the signal receiving device is used for determining that a shielding object exists under the condition that the infrared light signal transmitted by the infrared transmitting tube is received, and determining that the shielding object does not exist under the condition that the infrared light signal transmitted by the infrared transmitting tube is not received.
Optionally, the signal receiving device includes an amplifying circuit and a plurality of photodiodes, where the photodiodes are connected in parallel and then connected to the amplifying circuit, and the photodiodes are configured to convert a received infrared light signal into an electrical signal, and the amplifying circuit is configured to combine the electrical signals corresponding to the photodiodes to obtain a target electrical signal, and amplify the target electrical signal.
Optionally, the TFT layer includes a plurality of transistors, and a thickness of an insulating layer between a gate and a channel of each transistor is greater than or equal to a skin depth of the infrared emitting tube.
Optionally, a length of the insulating layer between the drain and the source of each transistor in the TFT layer is greater than or equal to a preset distance threshold.
In a second aspect of the present disclosure, a control method of a display screen is provided, which is applied to a controller in the display screen, where the display screen includes a substrate, a TFT layer, an OLED layer, a distance sensor and the controller, the substrate is covered with the TFT layer, the OLED layer is covered with the TFT layer, the distance sensor is disposed below the substrate, the controller is connected with the distance sensor, and the distance sensor is configured to emit an infrared light signal when receiving a driving signal, and determine whether there is a blocking object according to a result of receiving a feedback signal of the infrared light signal; the controller is used for controlling the TFT layer to be turned off under the condition that the shielding object is determined to exist, so that the OLED layer is turned off, and controlling the TFT layer to be turned on under the condition that the shielding object is determined to not exist, so that the OLED layer emits light; the method comprises the following steps:
when the distance sensor emits an infrared light signal, the energy density and/or emission time of the infrared light signal emitted by the distance sensor are adjusted so that the TFT layer is not sensitized.
Optionally, the adjusting the energy density and/or the emission time of the infrared light signal emitted by the distance sensor includes:
controlling the distance sensor to emit the infrared light signal according to a first preset emission power under the condition that the TFT layer is conducted;
and under the condition that the TFT layer is cut off, controlling the distance sensor to emit the infrared light signal according to a second preset emission power, wherein the first preset emission power is smaller than the second preset emission power so as to reduce the energy density of the distance sensor to emit the infrared light signal.
Optionally, the adjusting the energy density and/or the emission time of the infrared light signal emitted by the distance sensor includes:
under the condition that the TFT layer is conducted, the distance sensor is controlled to emit the external red light signal according to a first preset emission frequency;
and under the condition that the TFT layer is cut off, controlling the distance sensor to emit the external red light signal according to a second preset emission frequency, wherein the first preset frequency is larger than the second preset power so as to shorten the light emitting duration of the infrared light signal emitted by the distance sensor once.
Optionally, the adjusting the energy density and/or the emission time of the infrared light signal emitted by the distance sensor includes:
under the condition that a screen light-emitting signal is received, after a preset time is delayed, the TFT layer is controlled to be conducted, and in the time delay process, the distance sensor is controlled to emit the infrared light signal, the screen light-emitting signal is used for indicating the OLED layer to emit light, and the light-emitting time of the distance sensor to emit the infrared light signal is changed.
Optionally, the adjusting the energy density and/or the emission time of the infrared light signal emitted by the distance sensor includes:
and controlling the TFT layer to be continuously cut off for a second target time period every a first target time period, controlling the distance sensor to emit the infrared light signal in the second target time period, and changing the light emitting time of the distance sensor to emit the infrared light signal.
Optionally, the distance sensor comprises a signal transmitting device and a signal receiving device, wherein the signal transmitting device comprises an infrared transmitting tube driving circuit and a plurality of infrared transmitting tubes, and the plurality of infrared transmitting tubes are connected in series and then connected with the infrared transmitting tube driving circuit;
the signal transmitting device is used for transmitting infrared light signals under the condition of receiving the driving signals;
the signal receiving device is used for determining that a shielding object exists under the condition that an infrared light signal emitted by the infrared emission tube is received, and determining that the shielding object does not exist under the condition that an infrared signal emitted by the infrared emission tube is not received.
Optionally, the signal receiving device includes an amplifying circuit and a plurality of photodiodes, where the photodiodes are connected in parallel and then connected to the amplifying circuit, and the photodiodes are configured to convert a received infrared light signal into an electrical signal, and the amplifying circuit is configured to combine the electrical signals corresponding to the photodiodes to obtain a target electrical signal, and amplify the target electrical signal.
Optionally, the TFT layer includes a plurality of transistors, and a thickness of an insulating layer between a gate and a channel of each transistor is greater than or equal to a skin depth of the infrared emitting tube.
Optionally, a length of the insulating layer between the drain and the source of each transistor in the TFT layer is greater than or equal to a preset distance threshold.
In a third aspect of the present disclosure, a terminal is provided, including a display screen as described in the first aspect above.
Through the technical scheme, when the distance sensor transmits infrared light signals, the distance sensor is adjusted to transmit the energy density and/or the transmitting time of the infrared light signals, so that the TFT layer is not sensitive to light, the TFT layer can be prevented from generating sensitive current under the stimulation of the infrared light signals transmitted by the distance sensor, the current abrupt change of controlling the light emission of the OLED layer is avoided, screen light spots are eliminated, the service life of a screen is effectively prolonged, and the user experience is improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic illustration of a display screen shown in an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of a distance sensor according to another exemplary embodiment of the present disclosure;
fig. 3 is a schematic structural view of a transistor according to still another exemplary embodiment of the present disclosure.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
Before describing the specific embodiments of the present disclosure in detail, firstly, an application scenario of the present disclosure is described, and the present disclosure may be applied to a scenario below a ps sensor design screen, where a detection signal of the ps sensor is generally a 940nm/850nm infrared light signal, and when the ps sensor emits a detection signal, the 940nm/850nm infrared light signal stimulates a TFT layer in the screen to control OLED light emission to generate a photosensitive current, that is, when a certain transistor in the TFT layer is irradiated by the infrared light signal, a current flowing in a PN node in the transistor is stimulated to become large, so that an OLED pixel controlled by the transistor is too bright, so that a pixel mutation occurs, and a screen flare is formed, so that under the influence of the photosensitive current, not only is the screen easily damaged, but also the screen flare can seriously affect the user experience.
In order to solve the technical problem, the disclosure provides a display screen, a display screen control method and a terminal, when the distance sensor transmits an infrared light signal, the display screen adjusts the energy density and/or the transmitting time of the infrared light signal transmitted by the distance sensor, so that the TFT layer is not sensitive, the TFT layer can be prevented from generating sensitive current under the stimulation of the infrared light signal transmitted by the distance sensor, the current mutation for controlling the light emission of the OLED layer is avoided, the screen light spot is eliminated, the service life of the screen is effectively prolonged, and the user experience is improved.
FIG. 1 is a schematic illustration of a display screen shown in an exemplary embodiment of the present disclosure; referring to fig. 1, the display screen includes: a substrate 101, a TFT (Thin Film Transistor, a thin film transistor) layer 102, an OLED (organic light-Emitting Diode) layer 103, a distance sensor 104 and a controller 105, wherein the TFT layer 102 is covered on the substrate 101, the OLED layer 103 is covered on the TFT layer 102, the distance sensor 104 is disposed below the substrate 101, the controller 105 is connected with the distance sensor 104, and the distance sensor 104 is used for Emitting an infrared light signal when receiving a driving signal, and determining whether a shielding object exists according to a receiving result of the infrared light signal;
the controller 105 is configured to control the TFT layer to be turned off to extinguish the OLED layer when it is determined that an obstruction is present, and control the TFT layer to be turned on to emit light when it is determined that no obstruction is present;
the controller 105 is further configured to adjust an energy density and/or an emission time of the infrared light signal emitted by the distance sensor when the distance sensor emits the infrared light signal, so that the TFT layer is not sensitized.
The TFT layer 102 is integrated by a plurality of thin film transistors, the thin film transistors are used for driving liquid crystal pixels in the OLED layer, the distance sensor 104 may be a psensor, the infrared light signal emitted by the distance sensor 104 may be 940nm or 850nm infrared light, the process of detecting the obstruction by the distance sensor 104 may be that the infrared light signal is emitted once every other sampling period, the infrared light signal encounters the obstruction, the propagation direction is changed, and thus the infrared light signal is received by the distance sensor, the distance sensor 104 determines whether the obstruction exists according to the received infrared light signal, for example, determines that the obstruction exists when the reflected signal of the infrared light signal is received within a specified time period, and determines that the obstruction does not exist when the infrared light signal is not received within the specified time period.
In addition, the emission time may be a light emission time period, or may be a light emission time period for emitting an infrared light signal, where the light emission time period is a time period for emitting an infrared light signal.
The above-described embodiments of adjusting the energy density and/or emission time of the infrared light signal emitted by the distance sensor may include at least one of the following:
in one aspect, the controller 105 is configured to: and under the condition that the TFT layer 102 is turned on, controlling the distance sensor to emit the infrared light signal according to a first preset emission power, and under the condition that the TFT layer 102 is turned off, controlling the distance sensor 104 to emit the infrared light signal according to a second preset emission power, wherein the first preset emission power is smaller than the second preset emission power so as to reduce the energy density of the infrared light signal emitted by the distance sensor 104.
The TFT layer 102 being turned on may mean that at least one of the plurality of thin film transistors forming the TFT layer is in an on state, and when the TFT layer 102 is turned on, the OLED layer is in an image display state, and the TFT layer 102 being turned off may mean that the TFT layer is not powered, or that all of the plurality of thin film transistors are in an off state.
It should be noted that, when the distance sensor 104 emits the infrared light signal according to the first preset emission frequency, the energy density of the infrared light signal emitted by the distance sensor 104 is insufficient to enable the TFT layer 102 to generate a photosensitive current, or the generated photocurrent is relatively smaller, so that the influence on the pixel can be reduced, and the effect that the human eye is not easily aware is achieved; in the case that the TFT layer 102 is turned off, even if the distance sensor 104 emits the infrared light signal according to the second preset emission power, the TFT layer 102 is stimulated to generate a photosensitive current, and the TFT layer 102 is in the off state, so that the generated photosensitive current is generally smaller, and the turned-off thin film transistor is not turned on, so that no screen light spot is generated. In this way, by reducing the emission power of the distance sensor 104 when the TFT layer 102 is turned on, the screen light spot can be effectively eliminated, and under the condition that the TFT layer 102 is turned off, the distance sensor 104 is controlled to emit the infrared light signal according to the higher emission power, so that the detection performance of the distance sensor can be effectively ensured.
In a second mode, the controller 105 is configured to: controlling the distance sensor 104 to emit the external red light signal according to a first preset emission frequency under the condition that the TFT layer 102 is turned on; controlling the distance sensor 104 to emit the external red light signal according to a second preset emission frequency under the condition that the TFT layer 102 is cut off; the first preset frequency is larger than the second preset power so as to shorten the light emitting duration of the infrared light signal emitted by the distance sensor once.
It should be noted that, when the distance sensor 104 is controlled to emit the external red light signal according to the first preset emission frequency, the time of each occurrence of the infrared light signal is shortened in the case where the emission power is unchanged, so that even if the photosensitive current is generated in the TFT layer 102 when the infrared light signal is emitted, the effect that the human eyes cannot perceive is achieved due to the extremely fast frequency of the flicker, and the effect of visually eliminating the light spot on the screen can be achieved.
In addition, when the TFT layer 102 is turned off, even if the frequency of emitting the infrared light signal is small, a long time of emitting the infrared light signal once generates a photo-induced current, and since the TFT layer 102 is turned off, the generated photo-induced current is generally small enough to turn on the turned-off thin film transistor, and thus no screen flare is generated. And under the condition that the TFT layer 102 is cut off, the distance sensor 104 is controlled to emit the external red light signal according to a smaller emission frequency, so that the detection performance of the distance sensor can be ensured, and the OLED layer can be timely controlled to emit light when the detection of the departure of a shielding object is determined.
In a third aspect, the controller 105 is configured to: and under the condition that a screen light-emitting signal is received, after a preset time is delayed, controlling the TFT layer 102 to be conducted, and controlling the distance sensor 104 to emit the infrared light signal in the time delay process, wherein the screen light-emitting signal is used for indicating the OLED layer to emit light so as to change the light-emitting time of the distance sensor 104 to emit the infrared light signal.
The light emitting time is a time interval for emitting the infrared light signal, the screen light emitting signal may be a screen frame synchronization signal, and the preset time may be less than a reaction time of a human (e.g., 0.2 seconds), for example, a time length of less than a millisecond, such as 1 millisecond, 5 nanoseconds, 20 picoseconds, and the like. Under the condition that the screen light-emitting signal is received, the TFT layer 102 is not turned on first, but is turned on after the preset time is delayed, so that corresponding images are displayed, in the delay process, the distance sensor is controlled to emit the infrared light signal, at the moment, because the TFT layer 102 is still in the cut-off state, screen light spots are not generated, and the effect of eliminating the screen light spots can be effectively achieved.
In a fourth aspect, the controller 105 is configured to: the TFT layer 102 is continuously turned off for a second target period every first target period, and the distance sensor is controlled to emit the infrared light signal during the second target period to change the light emission time of the infrared light signal emitted by the distance sensor.
The first target time period and the second target time period also belong to a reaction time period smaller than that of human beings for image change, for example, 0.2 seconds.
For example, the display screen will be in an image display state all the time within 10 minutes from the moment, that is, the TFT layer 102 is in an on state all the time within 10 minutes, in order to adjust the light emitting time of the infrared light signal emitted by the distance sensor, so that the distance sensor emits the infrared light signal under the condition that the TFT layer 102 is turned off, the controller 105 controls the TFT layer 102 to emit the infrared light signal every 10 milliseconds (the first target period) within 10 minutes, to be turned off for 2 milliseconds, and controls the distance sensor to emit the infrared light signal within 2 milliseconds, so that when the TFT layer 102 is turned off, the distance sensor is controlled to emit the infrared light signal, and thus, the generation of a photosensitive current affecting the brightness of pixels in the TFT layer can be effectively avoided, thereby achieving the effect of eliminating the screen light spots.
Above-mentioned technical scheme is in through making this display screen when the infrared light signal is launched to the distance sensor, adjusts the distance sensor is launched infrared light signal's energy density and/or transmission time, so that TFT layer is not sensitization, can avoid the TFT layer to produce the photosensitive current under the stimulus of infrared light signal apart from the sensor transmission, avoids the luminous current mutation in control OLED layer, eliminates the screen facula to can effectively promote the life of screen, promote user experience.
FIG. 2 is a schematic circuit diagram of a distance sensor according to another exemplary embodiment of the present disclosure; as shown in fig. 2, the distance sensor 104 includes a signal transmitting device 1041 and a signal receiving device 1042, wherein the signal transmitting device 1041 includes an infrared transmitting tube driving circuit and a plurality of infrared transmitting tubes Dn, and the plurality of infrared transmitting tubes Dn are connected in series and then connected with the infrared transmitting tube driving circuit;
the signal emitting device 1041 is configured to emit an infrared light signal when receiving a driving signal;
the signal receiving device 1042 is configured to determine that a blocking object exists when receiving the infrared light signal transmitted by the infrared transmitting tube, and determine that no blocking object exists when not receiving the infrared light signal transmitted by the infrared transmitting tube.
The infrared emission tube (D1-D3) is an infrared light-emitting diode with 940nm or 850nm, the infrared emission tube driving circuit can comprise a transistor T, the source electrode of the transistor T is connected with the infrared emission tube (D1-D3) in series and then grounded, the drain electrode of the transistor T is connected with a power supply end, the grid electrode of the transistor is used as a control end for receiving a driving signal, and the driving signal can be a high-level signal.
In the fifth embodiment, one infrared emission tube in the related art is changed into a form that a plurality of infrared emission tubes are connected in series, that is, under the condition that the driving circuit of the infrared emission tube is unchanged, the light emitting brightness of each infrared emission tube can be reduced, which is beneficial to reducing the energy density of the infrared light signal emitted by the distance sensor, so that the probability of occurrence of a screen facula can be effectively reduced.
In addition, in this embodiment, in order to avoid the problem of the decrease of the detection performance of the distance sensor caused by the serial connection of the infrared emission tubes, the signal receiving device includes an amplifying circuit and a plurality of photodiodes (e.g., D4-D6), the photodiodes are connected in parallel and then connected to the amplifying circuit, the photodiodes are used for converting the received infrared light signal into an electrical signal, and the amplifying circuit is used for combining the electrical signals corresponding to the photodiodes to obtain a target electrical signal and amplifying the target electrical signal. Thus, the electric signals obtained by converting each photodiode are combined to obtain the target electric signal, and the target electric signal is amplified, so that the detection performance of the distance sensor can be effectively ensured.
Like this, through the inner structure who changes this distance sensor, realize many transmission many accepted detection mode to reduce the energy density of this distance sensor, eliminate the screen facula, prolong the life of screen, promote user's experience.
Fig. 3 is a schematic structural view of a transistor according to still another exemplary embodiment of the present disclosure, and the TFT layer includes a plurality of transistors, as shown in fig. 3, each of which has a thickness of an insulating layer between a gate and a channel greater than or equal to a skin depth of the infrared emission tube.
The thickness of the insulating layer between the grid electrode and the channel is the distance corresponding to the line segment a in the graph, and under the condition that the thickness of the insulating layer between the grid electrode and the channel is larger than or equal to the skin depth, the depth of electron movement generated by the stimulation of the infrared light signal emitted by the infrared light emitting tube cannot penetrate through the insulating layer, so that the current flowing in the channel cannot be influenced, and the occurrence of a screen light spot is avoided.
In addition, the length of the insulating layer between the drain and the source of each transistor in the TFT layer may be greater than or equal to a preset distance threshold.
The length of the insulating layer between the drain electrode and the source electrode of the transistor is increased, so that the starting voltage of the transistor is increased, the transistor is prevented from being turned on by generated photosensitive current, the phenomenon that the transistor is turned on due to the influence of the photosensitive current when the transistor is turned off is avoided, and accordingly the occurrence of screen light spots is effectively avoided.
It should be noted that, the length of the insulating layer between the drain electrode and the source electrode is the distance indicated by the line segment b in the drawing, the preset distance threshold may be obtained by experimental measurement in advance, or may be obtained by calculation according to the detected magnitude of the photosensitive current and the internal resistance of the transistor, and the specific calculation process may refer to the related formulas in the prior art, which is not described herein in detail.
According to the technical scheme, the technical effect of eliminating the screen light spots is achieved by changing the structure of the transistor in the TFT layer, the TFT layer can be effectively prevented from generating photosensitive current under the stimulation of infrared light signals emitted by the distance sensor, the current mutation for controlling the OLED layer to emit light is avoided, the screen light spots are eliminated, the service life of the screen is effectively prolonged, and the user experience is improved.
A display screen control method shown in another exemplary embodiment of the present disclosure is applied to a controller in a display screen, where the display screen includes a substrate, a TFT layer, an OLED layer, a distance sensor and the controller, the substrate is covered with the TFT layer, the OLED layer is covered with the TFT layer, the distance sensor is disposed below the substrate, the controller is connected to the distance sensor, and the distance sensor is configured to emit an infrared light signal when receiving a driving signal, and determine whether there is a blocking object according to a result of receiving a feedback signal of the infrared light signal; the controller is used for controlling the TFT layer to be turned off under the condition that the shielding object is determined to exist, so that the OLED layer is turned off, and controlling the TFT layer to be turned on under the condition that the shielding object is determined to not exist, so that the OLED layer emits light; the method may include:
when the distance sensor emits an infrared light signal, the energy density and/or emission time of the infrared light signal emitted by the distance sensor is adjusted so that the TFT layer is not sensitized.
Wherein the embodiment of adjusting the energy density and/or the emission time of the infrared light signal emitted by the distance sensor may comprise at least one of the following embodiments:
in a first mode, under the condition that the TFT layer is conducted, the distance sensor is controlled to emit the infrared light signal according to a first preset emission power;
and under the condition that the TFT layer is cut off, controlling the distance sensor to emit the infrared light signal according to a second preset emission power, wherein the first preset emission power is smaller than the second preset emission power so as to reduce the energy density of the distance sensor to emit the infrared light signal.
In a second mode, under the condition that the TFT layer is conducted, the distance sensor is controlled to emit the external red light signal according to a first preset emission frequency;
and under the condition that the TFT layer is cut off, controlling the distance sensor to emit the external red light signal according to a second preset emission frequency, wherein the first preset frequency is larger than the second preset power so as to shorten the light emitting duration of the infrared light signal emitted by the distance sensor for a single time.
In a third mode, when a screen light-emitting signal is received, after a preset time is delayed, the TFT layer is controlled to be conducted, and in the time delay process, the distance sensor is controlled to emit the infrared light signal, the screen light-emitting signal is used for indicating the OLED layer to emit light, and the light-emitting time of the distance sensor for emitting the infrared light signal is changed.
In a fourth mode, the TFT layer is controlled to be continuously cut off for a second target period every first target period, and the distance sensor is controlled to emit the infrared light signal in the second target period, so that the light emitting time of the infrared light signal emitted by the distance sensor is changed.
According to the first mode, the energy density and/or the emission time of the infrared light signal emitted by the distance sensor are/is adjusted when the infrared light signal is emitted by the distance sensor through the display screen, so that the TFT layer is not sensitive, the TFT layer can be prevented from generating sensitive current under the stimulation of the infrared light signal emitted by the distance sensor, the current mutation for controlling the light emitting of the OLED layer is avoided, the light spot of the screen is eliminated, the service life of the screen is effectively prolonged, and the user experience is improved.
The following mode five realizes reducing the energy density of infrared light signals sent by the distance sensor through improving the internal structure of the distance sensor, thereby achieving the technical effect of eliminating screen light spots.
In a fifth mode, the distance sensor comprises a signal transmitting device and a signal receiving device, wherein the signal transmitting device comprises an infrared transmitting tube driving circuit and a plurality of infrared transmitting tubes, and the plurality of infrared transmitting tubes are connected in series and then connected with the infrared transmitting tube driving circuit;
the signal transmitting device is used for transmitting infrared light signals under the condition of receiving the driving signals;
the signal receiving device is used for determining that a shielding object exists under the condition that an infrared light signal emitted by the infrared emission tube is received, and determining that the shielding object does not exist under the condition that an infrared signal emitted by the infrared emission tube is not received.
The signal receiving device comprises an amplifying circuit and a plurality of photodiodes, wherein the photodiodes are connected in parallel and then connected with the amplifying circuit, the photodiodes are used for converting received infrared light signals into electric signals, and the amplifying circuit is used for obtaining target electric signals after combining the electric signals corresponding to the photodiodes and amplifying the target electric signals.
Like this, through the inner structure who changes this distance sensor, realize many transmission many accepted detection mode to reduce the energy density of this distance sensor, eliminate the screen facula, prolong the life of screen, promote user's experience.
The structure of the transistor in the TFT layer is adjusted in the sixth mode and the seventh mode, so that the starting voltage of the transistor is improved, and the technical effect of eliminating screen light spots is achieved.
In a sixth mode, the TFT layer includes a plurality of transistors, and a thickness of an insulating layer between a gate electrode and a channel of each transistor is greater than or equal to a skin depth of the infrared emission tube.
In a seventh aspect, a length of an insulating layer between a drain and a source of each transistor in the TFT layer is greater than or equal to a preset distance threshold.
According to the technical scheme, the technical effect of eliminating the screen light spots is achieved by changing the structure of the transistor in the TFT layer, the TFT layer can be effectively prevented from generating photosensitive current under the stimulation of infrared light signals emitted by the distance sensor, the current mutation for controlling the OLED layer to emit light is avoided, the screen light spots are eliminated, the service life of the screen is effectively prolonged, and the user experience is improved.
In yet another exemplary embodiment of the present disclosure, a terminal is provided, which includes the display screen shown in fig. 1 above.
The detailed explanation of the various embodiments has been described in detail in relation to the method section of the above examples, in which the apparatus is described in the examples, and will not be explained in detail here.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (13)
1. A display screen, comprising: the device comprises a substrate, a TFT layer, an OLED layer, a distance sensor and a controller, wherein the TFT layer is covered on the substrate, the OLED layer is covered on the TFT layer, the distance sensor is arranged below the substrate, the controller is connected with the distance sensor, and the distance sensor is used for emitting infrared light signals under the condition of receiving driving signals and determining whether a shielding object exists according to the receiving result of the infrared light signals;
the controller is used for controlling the TFT layer to be turned off under the condition that the shielding object is determined to exist, so that the OLED layer is turned off, and controlling the TFT layer to be turned on under the condition that the shielding object is determined to not exist, so that the OLED layer emits light;
the controller is further used for adjusting the energy density and/or the emission time of the infrared light signals emitted by the distance sensor when the infrared light signals are emitted by the distance sensor, so that the TFT layer is not sensitized;
the distance sensor comprises a signal transmitting device and a signal receiving device, wherein the signal transmitting device comprises an infrared transmitting tube driving circuit and a plurality of infrared transmitting tubes, and the plurality of infrared transmitting tubes are connected in series and then connected with the infrared transmitting tube driving circuit;
the signal transmitting device is used for transmitting infrared light signals under the condition of receiving the driving signals;
the signal receiving device is used for determining that a shielding object exists under the condition that an infrared light signal transmitted by the infrared transmitting tube is received, and determining that the shielding object does not exist under the condition that the infrared light signal transmitted by the infrared transmitting tube is not received;
the TFT layer comprises a plurality of transistors, and the thickness of an insulating layer between the grid electrode and the channel of each transistor is larger than or equal to the skin depth of the infrared emission tube; the length of the insulating layer between the drain electrode and the source electrode of each transistor in the TFT layer is greater than or equal to a preset distance threshold.
2. A display screen as recited in claim 1, wherein,
the controller is used for: and under the condition that the TFT layer is turned on, controlling the distance sensor to transmit the infrared light signal according to a first preset transmitting power, and under the condition that the TFT layer is turned off, controlling the distance sensor to transmit the infrared light signal according to a second preset transmitting power, wherein the first preset transmitting power is smaller than the second preset transmitting power so as to reduce the energy density of the distance sensor to transmit the infrared light signal.
3. A display screen as recited in claim 1, wherein,
the controller is used for: controlling the distance sensor to emit the infrared light signal according to a first preset emission frequency under the condition that the TFT layer is conducted; under the condition that the TFT layer is cut off, controlling the distance sensor to emit the infrared light signal according to a second preset emission frequency; the first preset frequency is larger than the second preset power so as to shorten the light emitting duration of the infrared light signal emitted by the distance sensor once.
4. A display screen as recited in claim 1, wherein,
the controller is used for: under the condition that a screen light-emitting signal is received, after a preset time is delayed, the TFT layer is controlled to be conducted, and in the time delay process, the distance sensor is controlled to emit the infrared light signal, and the screen light-emitting signal is used for indicating the OLED layer to emit light so as to change the light-emitting time of the distance sensor to emit the infrared light signal.
5. A display screen as recited in claim 1, wherein,
the controller is used for: and continuously stopping the TFT layer for a second target time period every first target time period, and controlling the distance sensor to emit the infrared light signal in the second target time period so as to change the light emitting time of the distance sensor for emitting the infrared light signal.
6. The display screen according to claim 1, wherein the signal receiving device comprises an amplifying circuit and a plurality of photodiodes, the photodiodes are connected in parallel and then connected with the amplifying circuit, the photodiodes are used for converting received infrared light signals into electric signals, and the amplifying circuit is used for combining the electric signals corresponding to the photodiodes to obtain target electric signals and amplifying the target electric signals.
7. The display screen control method is characterized by being applied to a controller in a display screen, wherein the display screen comprises a substrate, a TFT layer, an OLED layer, a distance sensor and the controller, the substrate is covered with the TFT layer, the OLED layer is covered on the TFT layer, the distance sensor is arranged below the substrate, the controller is connected with the distance sensor, and the distance sensor is used for transmitting infrared light signals under the condition of receiving driving signals and determining whether a shielding object exists according to the receiving result of feedback signals of the infrared light signals; the controller is used for controlling the TFT layer to be turned off under the condition that the shielding object is determined to exist, so that the OLED layer is turned off, and controlling the TFT layer to be turned on under the condition that the shielding object is determined to not exist, so that the OLED layer emits light; the distance sensor comprises a signal transmitting device and a signal receiving device, wherein the signal transmitting device comprises an infrared transmitting tube driving circuit and a plurality of infrared transmitting tubes, and the plurality of infrared transmitting tubes are connected in series and then connected with the infrared transmitting tube driving circuit; the signal transmitting device is used for transmitting infrared light signals under the condition of receiving the driving signals; the signal receiving device is used for determining that a shielding object exists under the condition that an infrared light signal emitted by the infrared emission tube is received, and determining that the shielding object does not exist under the condition that an infrared signal emitted by the infrared emission tube is not received; the method comprises the following steps:
when the distance sensor emits infrared light signals, adjusting the energy density and/or the emission time of the infrared light signals emitted by the distance sensor so that the TFT layer is not sensitive to light;
the TFT layer comprises a plurality of transistors, and the thickness of an insulating layer between the grid electrode and the channel of each transistor is larger than or equal to the skin depth of the infrared emission tube; the length of the insulating layer between the drain electrode and the source electrode of each transistor in the TFT layer is greater than or equal to a preset distance threshold.
8. The method of claim 7, wherein said adjusting the energy density and/or emission time at which said distance sensor emits said infrared light signal comprises:
controlling the distance sensor to emit the infrared light signal according to a first preset emission power under the condition that the TFT layer is conducted;
and under the condition that the TFT layer is cut off, controlling the distance sensor to emit the infrared light signal according to a second preset emission power, wherein the first preset emission power is smaller than the second preset emission power so as to reduce the energy density of the distance sensor to emit the infrared light signal.
9. The method of claim 7, wherein said adjusting the energy density and/or emission time at which said distance sensor emits said infrared light signal comprises:
controlling the distance sensor to emit the infrared light signal according to a first preset emission frequency under the condition that the TFT layer is conducted;
and under the condition that the TFT layer is cut off, controlling the distance sensor to emit the infrared light signal according to a second preset emission frequency, wherein the first preset frequency is larger than the second preset power so as to shorten the light emitting duration of the distance sensor for emitting the infrared light signal once.
10. The method of claim 7, wherein said adjusting the energy density and/or emission time at which said distance sensor emits said infrared light signal comprises:
under the condition that a screen light-emitting signal is received, after a preset time is delayed, the TFT layer is controlled to be conducted, and in the time delay process, the distance sensor is controlled to emit the infrared light signal, the screen light-emitting signal is used for indicating the OLED layer to emit light, and the light-emitting time of the distance sensor to emit the infrared light signal is changed.
11. The method of claim 7, wherein said adjusting the energy density and/or emission time at which said distance sensor emits said infrared light signal comprises:
and controlling the TFT layer to be continuously cut off for a second target time period every a first target time period, controlling the distance sensor to emit the infrared light signal in the second target time period, and changing the light emitting time of the distance sensor to emit the infrared light signal.
12. The method of claim 7, wherein the signal receiving apparatus comprises an amplifying circuit and a plurality of photodiodes, the photodiodes are connected in parallel and then connected to the amplifying circuit, the photodiodes are used for converting received infrared light signals into electric signals, and the amplifying circuit is used for combining the electric signals corresponding to the photodiodes to obtain a target electric signal and amplifying the target electric signal.
13. A terminal comprising a display as claimed in any one of the preceding claims 1-6.
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