CN112526779A - Substrate of display panel, driving method and non-portable display device - Google Patents
Substrate of display panel, driving method and non-portable display device Download PDFInfo
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- CN112526779A CN112526779A CN202011327048.5A CN202011327048A CN112526779A CN 112526779 A CN112526779 A CN 112526779A CN 202011327048 A CN202011327048 A CN 202011327048A CN 112526779 A CN112526779 A CN 112526779A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
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- G—PHYSICS
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention discloses a substrate of a display panel, a driving method and a non-portable display device. The substrate of the display panel comprises a light incident surface and a backlight module facing the display panel; the light emitting surface faces a user and is arranged opposite to the light incident surface; the light incident surface sensor is formed on the surface of the substrate and faces the light incident surface of the display panel; a light emitting surface sensor formed on the surface of the substrate and facing the light emitting surface of the display panel; and the backlight adjusting unit is connected with the light incoming surface sensor and the light outgoing surface sensor and is used for adjusting the luminous intensity of the backlight module. The invention can achieve the purposes of energy saving, environmental protection and eyesight protection, and improves the adjusting effect of the backlight light intensity.
Description
Technical Field
The invention relates to the technical field of display, in particular to a substrate of a display panel, a driving method and a non-portable display device.
Background
The display is a display tool which displays a certain electronic file on a screen through a specific transmission device and reflects the electronic file to human eyes, has been deeply integrated into our daily life, and becomes an indispensable part of our production life.
With the progress of technology, the quality and display effect of the display become better and better. In order to save energy consumption and reduce the stimulation of the display to eyes along with the change of the environment, most of the portable displays are provided with photoreceptors for controlling the change of the backlight intensity of the display along with the change of the environment. However, few televisions and computers are provided with photosensitive devices, most people consider that the medium-sized and large-sized displays are mainly applied indoors, and the presence or absence of the photosensitive devices hardly affects the displays. With the deep mind of energy-saving and environment-friendly calls and the rapid increase of the proportion of myopia of teenagers, it is more necessary to install photosensitive equipment on a large-size display so as to adjust the light intensity of the display along with the change of the environment.
Disclosure of Invention
The invention aims to provide a substrate of a display panel, a driving method and a non-portable display device for improving backlight adjustment effect.
In order to achieve the above object, the present invention provides a substrate for a display panel, the substrate includes a light incident surface facing a backlight module of the display panel; the light emitting surface faces a user and is arranged opposite to the light incident surface; the light incident surface sensor is formed on the surface of the substrate and faces the light incident surface of the display panel; a light emitting surface sensor formed on the surface of the substrate and facing the light emitting surface of the display panel; the backlight adjusting unit is connected with the light incoming surface sensor and the light outgoing surface sensor.
Optionally, the substrate includes a dual-gate thin film transistor driving a pixel electrode of the substrate, and the dual-gate thin film transistor sequentially includes, from a substrate of the substrate, a first gate electrode layer, a first insulating layer, an active layer, a second insulating layer, a second gate electrode layer, a passivation layer, and a source-drain metal layer, which are stacked; the light incident surface sensor sequentially comprises a first gate electrode layer, a first insulating layer, an active layer, a passivation layer and a source drain metal layer which are arranged in a stacked mode from a substrate of the substrate; the light-emitting surface sensor sequentially comprises a first insulating layer, an active layer, a second insulating layer, a second gate electrode layer, a passivation layer and a source-drain metal layer which are arranged in a stacked mode from a substrate of the substrate;
the source drain metal layer comprises a source electrode and a drain electrode; the drain electrode of the double-grid thin film transistor is connected to the pixel electrode, and the source electrode of the double-grid thin film transistor is connected to the data line of the substrate; a first gate electrode layer and a second gate electrode layer are connected to a scan line of the substrate; the source electrodes and the drain electrodes of the light incident surface sensor and the light emergent surface sensor are connected to the backlight adjusting unit; the first gate electrode layer and the second gate electrode layer are arranged in a suspended mode.
Optionally, the width of the first gate electrode layer is greater than or equal to the width of the active layer.
Optionally, the width of the second gate electrode layer is greater than or equal to the width between the source and the drain, and the sum of the width of the source, the width of the drain, and the width between the source and the drain is greater than or equal to the width of the active layer.
Optionally, the display panel includes a sequential circuit control board, and the backlight adjusting unit is disposed in the sequential circuit control board; and the drain electrodes of the light incident surface sensor and the light emergent surface sensor are connected to the sequential circuit control board.
Optionally, the substrate includes a display area, and the light incident surface sensor and the light emitting surface sensor are disposed in a corner area of the display area.
Optionally, the number of the light incident surface sensors and the number of the light emergent surface sensors in each corner region are not less than two.
The invention also discloses a driving method of the substrate, wherein the light incident surface sensor outputs first light intensity information, and the light emergent surface sensor outputs second light intensity information;
and adjusting the luminous intensity of the backlight module according to the first light intensity information and the second light intensity information.
Optionally, the driving method further includes acquiring third light intensity information of the ambient light;
and the backlight adjusting unit adjusts the luminous intensity of the backlight module according to the first light intensity information, the second light intensity information and the third light intensity information.
The invention also discloses a non-portable display device, which comprises the substrate of the display panel and a backlight module for providing a light source for the display panel; the substrate comprises a first substrate, a second substrate arranged in parallel with the first substrate, and a backlight adjusting unit; the backlight module is arranged on the light incident surface of the first substrate or the second substrate; the backlight adjusting unit is arranged on the first substrate or the second substrate; the light incident surface sensor and the light emergent surface sensor are electrically connected with the backlight adjusting unit; the backlight adjusting unit is electrically connected with the backlight module.
The display panel is simultaneously provided with the light incoming surface sensor and the light outgoing surface sensor, so that the backlight intensity of the display panel and the light outgoing surface intensity of the display panel can be simultaneously acquired, the light intensity information acquired by the light outgoing surface sensor simultaneously comprises the display light intensity and the ambient light intensity, and the light transmittance of the display panel is fixed after the display panel is manufactured, so that the display light intensity and the ambient light intensity can be calculated according to the backlight intensity, the light transmittance of the display panel and the light intensity of the light outgoing surface, and the backlight intensity can be adjusted according to the changes of the display light intensity and the ambient light intensity, so that the backlight intensity is in an ideal state, and the purposes of saving energy, protecting environment. By adopting the mode, an additional ambient light sensor is not needed, and the manufacturing cost is saved. Compared with the scheme of adjusting only according to the ambient light intensity, the invention considers the problems that the display light intensity of the display panel can be weakened along with the increase of the using time and the like, comprehensively considers the ambient light intensity and the display light intensity, and further improves the adjusting effect of the backlight light intensity.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a cross-sectional view of a non-portable display device according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of another non-portable display device according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of an active switch according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a light incident surface sensor according to an embodiment of the invention;
FIG. 5 is a schematic cross-sectional view of a light-emitting surface sensor according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating the relationship between light and current and voltage of a thin film transistor according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a driving method of a display panel according to an embodiment of the invention.
Wherein: 100, a display device; 10. a display panel; 11. a backlight module; 12. a substrate; 121. a first substrate; 122. a second substrate; 14. an active switch; 15. a substrate; 16. a light incident surface sensor; 17. a light exit surface sensor; 18. a backlight adjusting unit; 19. an ambient light sensor; 20. a double-gate thin film transistor; 21. a first gate electrode layer; 22. a second gate electrode layer; 23. a first insulating layer; 24. an active layer; 25. a second insulating layer; 26. a passivation layer; 27. a source drain metal layer; 28. a planarization layer; 29. a pixel electrode; 30. a source electrode; 31. a drain electrode; 32 sequential control circuit board.
Detailed Description
Specific structural and functional details disclosed herein are merely representative and are provided for purposes of describing example embodiments of the present application. This application may, however, be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, it is to be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and therefore should not be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The invention will be further described with reference to the drawings and preferred embodiments.
As shown in fig. 1, the present embodiment discloses a non-portable display device 100, which includes a substrate 12 of a display panel 10 and a backlight module 11, wherein the display panel 10 includes a first substrate 121 and a second substrate 122 disposed in parallel and opposite to each other, and a backlight adjusting unit 18; the backlight module 11 is disposed on the light incident surface of the first substrate or the second substrate.
The first substrate 121 includes an active switch 14 driving a pixel electrode of the display panel; the active switch 14 is formed on the substrate 15 of the first substrate 121, and the substrate is further provided with an incident surface sensor 16, an emergent surface sensor 17 and the backlight adjusting unit 18, wherein the incident surface sensor 16 and the emergent surface sensor 17 are electrically connected to the backlight adjusting unit 18; the light-incoming surface sensor 16 has a light-sensitive surface facing the light-incoming surface of the display panel and used for detecting the light intensity of the light-incoming surface of the non-portable display panel, the light-outgoing surface sensor 17 has a light-sensitive surface facing the light-outgoing surface of the display panel and used for detecting the light intensity of the light-outgoing surface of the non-portable display panel, and the backlight adjusting unit 18 is connected with the light-incoming surface sensor 16 and the light-outgoing surface sensor 17 and used for adjusting the backlight light intensity of the display panel, particularly.
Of course, any one or more of the sensor 16, the light exit surface sensor 17 and the backlight adjusting unit 18 may be disposed on the second substrate. Therefore, the first substrate 121 provided with the active switch is staggered, so that more space is available for operation, and wiring operation is facilitated.
The light incident surface is a surface of the first substrate 121 or the second substrate 122 facing the backlight module; the light-emitting surface is a surface facing the user and opposite to the light-entering surface.
The backlight adjusting unit 18 may be implemented using a separate chip, which is provided in the timing control circuit board 32 of the display panel.
The light incoming surface sensor and the light outgoing surface sensor are arranged in the display panel simultaneously, the backlight intensity of the display panel and the light intensity of the light outgoing surface can be collected simultaneously, the light intensity information collected by the light outgoing surface sensor simultaneously comprises the display light intensity and the ambient light intensity, and the light transmittance of the display panel is fixed after the manufacture is finished, so that the display light intensity and the ambient light intensity can be calculated according to the backlight light intensity, the light transmittance of the display panel and the light intensity of the light outgoing surface, and the backlight light intensity can be adjusted according to the change of the display light intensity and the ambient light intensity, so that the backlight light intensity is in an ideal state, the purposes of energy conservation, environmental protection and eyesight protection are achieved, and the adjusting effect; by adopting the mode, an additional ambient light sensor is not needed, and the manufacturing cost is saved. Compared with the scheme of adjusting only according to the ambient light intensity, the invention considers the problems that the display light intensity of the display panel can be weakened along with the increase of the using time and the like, comprehensively considers the ambient light intensity and the display light intensity, and further improves the adjusting effect of the backlight light intensity.
Although the light transmittance of the display panel is fixed, in the actual display process, due to factors such as the light intensity error of the backlight and the influence of the liquid crystal deflection on the light transmittance, the display light intensity calculated by multiplying the light intensity of the backlight by the light transmittance is deviated from the actual value, and therefore the calculated light intensity of the ambient light is also deviated. Therefore, in order to further enhance the backlight adjustment effect, the ambient light sensor 19 (refer to fig. 2) may be separately disposed in the non-display area of the display panel, so that the obtained ambient light intensity data is more accurate. Of course, the ambient light may be collected by other terminal devices and then fed back to the display panel.
The TFT is used as an important element in a display, can not only play a role in switching, but also can be made into a good photosensitive device. However, the current display capable of automatically adjusting the light intensity mainly collects the light intensity data of the external environment, and does not consider the problems that the light intensity of the display per se can be weakened along with the increase of the service time and the like
As shown in fig. 3-5, the active switch 14 is a dual-gate thin film transistor 20, which includes a first gate electrode layer 21 and a second gate electrode layer 22 for driving the dual-gate thin film transistor to turn on or off; the first gate electrode layer 21 is close to the light incident surface of the display panel; the second gate electrode layer 22 is close to the light-emitting surface of the non-portable display panel;
the light-in surface sensor removes a first gate electrode layer on the basis of the structure of the double-gate thin film transistor, and the other structures of the light-in surface sensor are the same as those of the double-gate thin film transistor, and the light-out surface sensor removes a second gate electrode layer on the basis of the structure of the double-gate thin film transistor, and the other structures of the light-out surface sensor are the same as those of the double-gate. The double-gate thin film transistor, the light incident surface sensor and the light emergent surface sensor are formed in the same manufacturing process and are identical in shape and size.
Specifically, the dual-gate thin film transistor comprises a first gate electrode layer 21, a first insulating layer 23, an active layer 24, a second insulating layer 25, a second gate electrode layer 22, a passivation layer 26 and a source-drain metal layer 27 which are sequentially stacked; the light incident surface sensor 16 includes a first gate electrode layer 21, a first insulating layer 23, an active layer 24, a passivation layer 26, and a source drain metal layer 27; the light output surface sensor 17 includes a first insulating layer 23, an active layer 24, a second insulating layer 25, a second gate electrode layer 22, a passivation layer 26, and a source-drain metal layer 27, which are stacked in this order. A planarization layer 28 and a pixel electrode 29 are also stacked in this order above the source-drain metal layer 27.
The first gate electrode layer 21 is formed on the substrate 15, and the source-drain metal layer 27 includes a source 30 and a drain 31 which are arranged in the same layer; the drain 31 of the double-gate thin film transistor 20 is connected to the pixel electrode 29; the source electrode 30 is connected to the data line of the first substrate 121; the first gate electrode layer 21 and the second gate electrode layer 22 are connected to the scan line of the first substrate 121; the source 30 and the drain 31 of the in-light surface sensor 16 and the out-light surface sensor 17 are connected to the backlight adjusting unit 18; the corresponding first gate electrode layer 21 and second gate electrode layer 22 are suspended.
If the active switch of the display panel adopts a single-grid structure, the light shading layer needs to be additionally manufactured for shading when the light incoming surface sensor and the light outgoing surface sensor are synchronously formed. The active switch of the invention adopts a double-gate structure, the bottom of the active layer of the light-emitting surface sensor 17 is shielded by the first gate electrode layer, and the second gate electrode layer is removed from the upper part, so that light rays emitted by the light-emitting surface of the display panel and ambient light can be detected. The active layer of the light incident surface sensor is shielded from light by the second gate electrode layer, and the first gate electrode layer is removed from the bottom, so that light rays emitted by the backlight module can be detected.
In a Poole-Frenkel emission region (Poole-Frenkel emission region), the current varies with the light intensity, so that the light intensity signal can be collected and converted into an electrical signal, and the relationship between the light intensity and the current can be referred to fig. 6. Therefore, the first gate electrode layer or the second gate electrode layer of the double-gate thin film transistor is removed, and a good photosensitive device can be obtained.
In view of the manufacturing process, although the active switch of the dual-gate tft structure is more than the active switch of the single-gate tft, the total manufacturing process is not additionally increased if the light emitting surface sensor and the light incident surface sensor are formed on the display panel at the same time. However, the double-gate thin film transistor has better stability compared with a thin film transistor with a single-gate structure due to the existence of two gates. The display effect of the display panel can be enhanced under the condition of equivalent cost. The shapes and sizes of the parts corresponding to the dual-gate thin film transistor, the light incident surface sensor and the light emergent surface sensor are the same, when the photomask is designed, the patterns of the parts corresponding to the three devices are the same, and in the manufacturing process, required process parameters (such as temperature, time, concentration of etching solution and the like) are also the same, so that the process difficulty can be reduced, the manufacturing cost can be reduced, and the quality can be controlled.
Furthermore, the width of the first gate electrode layer is larger than or equal to that of the active layer, so that light entering from the light emitting surface is completely isolated by the first gate electrode layer, and the light incident surface sensor is ensured to collect only light of the light incident surface. Similarly, the width of the second gate electrode layer is greater than or equal to the width between the source electrode and the drain electrode, and the sum of the width of the source electrode, the width of the drain electrode and the width between the source electrode and the drain electrode is greater than or equal to the width of the active layer. Thus, no light leakage gap exists among the source electrode, the drain electrode and the second gate electrode layer, and the active layer can be completely covered; therefore, light entering from the light inlet surface is completely isolated by the second gate electrode layer, and the light outlet surface sensor is ensured to collect light from the light outlet surface only.
The first substrate 121 includes a display area, the display area is rectangular, and the light incident surface sensor 16 and the light exiting surface sensor 17 are disposed at corner regions of four corners adjacent to the rectangle, so as to facilitate wiring. The display area routing of the display panel can influence the aperture opening ratio, and the middle area and the corner position of the display panel, which are main in the visual center of people, pay the weakest attention, so that the display panel is arranged in the corner area of the display panel, and the influence on the display effect can be reduced. And the wiring in the corner area is also shorter, so that the influence of the resistance-capacitance effect between the circuits on the transmission signals is reduced, and the acquisition precision is improved.
The number of the light incident surface sensors and the light emitting surface sensors in each corner area is not less than two, for example, 5 light incident surface sensors and 5 light emitting surface sensors are arranged at each corner, and 20 light incident surface sensors and 20 light emitting surface sensors are arranged at the four corners in total. The values of each sensor are different, if the difference is not large, the average value is taken, if the difference of a certain corner is too large, the difference is abandoned to be large, then the average value is taken, the finally obtained value is closer to the real light intensity, and the adjusting effect is improved.
Of course, it is also feasible to arrange the light incident surface sensor and the light emergent surface sensor in the middle region of the display area, the display effect is influenced mainly by the light intensity of the middle region of the display panel, and the display panel cannot realize absolute uniformity of backlight, so that the light intensity of the backlight can be better adjusted by collecting the light intensity of the middle region.
The light incident surface sensor, the light emergent surface sensor and the active switch can also be arranged on two different substrates, namely the light incident surface sensor and the light emergent surface sensor are arranged on the first substrate; the active switch and the pixel electrode are arranged on the second substrate, so that the wiring space of the substrate where the active switch is arranged is not occupied, and the wiring is easy. At this time, the light incident surface sensor and the light emitting surface sensor may be disposed at the middle position of the display region, so as to obtain more accurate light intensity data.
Non-portable display devices described herein include, but are not limited to, televisions, computer monitors, advertising displays, and the like.
As shown in fig. 7, the present embodiment discloses a method for driving the substrate,
s71, acquiring first light intensity information output by the light incident surface sensor and second light intensity information output by the light emergent surface sensor;
s72: and adjusting the luminous intensity of the backlight module according to the first light intensity information and the second light intensity information.
The first light intensity information X (backlight intensity) measured by the light incoming surface sensor is multiplied by the light transmittance of the display panel to obtain the display light intensity Z of the display panel, then the second light intensity Y measured by the light outgoing surface sensor is subtracted by Z to obtain the environment light intensity K, and the backlight adjusting unit adjusts the backlight intensity output by the backlight module according to K. Generally speaking, when the ambient light intensity is weak, the brightness of the backlight module is reduced, energy consumption is saved, and meanwhile, the phenomenon that the contrast between the brightness of the display panel and the ambient light intensity is too large, so that human eyes are uncomfortable is avoided. When the ambient light intensity is strong, the brightness of the backlight module is properly increased in order to make people see the display content clearly. Furthermore, the display light intensity Z can be calculated through the first light intensity information, the light transmittance and the second light intensity information, whether the brightness of the backlight module accords with the expected brightness or not is judged through the display light intensity Z, and the brightness of the backlight module is corrected through the display light intensity Z, so that the brightness of the display panel finally accords with the expected brightness.
Although the light transmittance of the display panel is fixed, in the actual display process, due to factors such as the light intensity error of the backlight and the influence of the liquid crystal deflection on the light transmittance, the display light intensity calculated by multiplying the light intensity of the backlight by the light transmittance is deviated from the actual value, and therefore the calculated light intensity of the ambient light is also deviated. Therefore, in order to further improve the backlight adjustment effect, the third light intensity information of the ambient light can be collected by using an independent sensor, so that the obtained ambient light intensity data is more accurate. The backlight adjusting unit adjusts the luminous intensity of the backlight module according to the first light intensity information, the second light intensity information and the third light intensity information.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it is not intended that the invention be limited to these details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A substrate for a display panel, comprising:
the light incident surface faces the backlight module of the display panel;
the light emitting surface faces a user and is arranged opposite to the light incident surface;
the light incident surface sensor is formed on the surface of the substrate and faces the light incident surface of the display panel; and
a light emitting surface sensor formed on the surface of the substrate and facing the light emitting surface of the display panel;
and the backlight adjusting unit is connected with the light incoming surface sensor and the light outgoing surface sensor.
2. The substrate of the display panel according to claim 1, wherein the substrate comprises a dual-gate thin film transistor driving a pixel electrode of the substrate, and the dual-gate thin film transistor comprises a first gate electrode layer, a first insulating layer, an active layer, a second insulating layer, a second gate electrode layer, a passivation layer and a source-drain metal layer which are stacked in sequence from a substrate of the substrate; the light incident surface sensor sequentially comprises a first gate electrode layer, a first insulating layer, an active layer, a passivation layer and a source drain metal layer which are arranged in a stacked mode from a substrate of the substrate; the light-emitting surface sensor sequentially comprises a first insulating layer, an active layer, a second insulating layer, a second gate electrode layer, a passivation layer and a source-drain metal layer which are arranged in a stacked mode from a substrate of the substrate;
the source drain metal layer comprises a source electrode and a drain electrode; the drain electrode of the double-grid thin film transistor is connected to the pixel electrode, and the source electrode of the double-grid thin film transistor is connected to the data line of the substrate; a first gate electrode layer and a second gate electrode layer are connected to a scan line of the substrate; the source electrodes and the drain electrodes of the light incoming surface sensor and the light outgoing surface sensor are connected to the backlight adjusting unit, and the first gate electrode layer and the second gate electrode layer are arranged in a suspended mode.
3. The substrate for a display panel according to claim 2, wherein a width of the first gate electrode layer is equal to or greater than a width of the active layer.
4. The substrate of the display panel according to claim 2, wherein a width of the second gate electrode layer is equal to or greater than a width between the source electrode and the drain electrode, and a sum of the width of the source electrode, the width of the drain electrode, and the width between the source electrode and the drain electrode is equal to or greater than a width of the active layer.
5. The substrate for a display panel according to claim 1, wherein the display panel includes a sequential circuit control board in which the backlight adjusting unit is disposed; and the drain electrodes of the light incident surface sensor and the light emergent surface sensor are connected to the sequential circuit control board.
6. The substrate of claim 1, wherein the substrate comprises a display area, and the light incident surface sensor and the light exiting surface sensor are disposed at corner regions of four corners of the display area.
7. The substrate of claim 6, wherein the number of the in-plane surface sensors and the out-plane surface sensors in each corner region is not less than two.
8. The method according to any one of claims 1 to 7, wherein the light incident surface sensor outputs first intensity information, and the light emitting surface sensor outputs second intensity information;
and adjusting the luminous intensity of the backlight module according to the first light intensity information and the second light intensity information.
9. The method of driving a substrate according to claim 8, further comprising acquiring third light intensity information of the ambient light;
and the backlight adjusting unit adjusts the luminous intensity of the backlight module according to the first light intensity information, the second light intensity information and the third light intensity information.
10. A non-portable display device comprising the substrate of the display panel according to any one of claims 1 to 7, and a backlight module for providing a light source to the display panel; the substrate comprises a first substrate, a second substrate arranged in parallel with the first substrate, and a backlight adjusting unit; the backlight module is arranged on the light incident surface of the first substrate or the second substrate; the backlight adjusting unit is arranged on the first substrate or the second substrate; the light incident surface sensor and the light emergent surface sensor are electrically connected with the backlight adjusting unit; the backlight adjusting unit is electrically connected with the backlight module.
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