CN113450691A - Display module and display device - Google Patents
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- CN113450691A CN113450691A CN202110707073.4A CN202110707073A CN113450691A CN 113450691 A CN113450691 A CN 113450691A CN 202110707073 A CN202110707073 A CN 202110707073A CN 113450691 A CN113450691 A CN 113450691A
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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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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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
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
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Abstract
The embodiment of the invention discloses a display module and a display device. In a specific embodiment, the display module comprises a display panel, a driving chip and a flexible circuit board, wherein a photosensitive element is arranged on the flexible circuit board; the driving chip is connected with two ends of the photosensitive element through two leads so as to detect the ambient light information by detecting the current of the photosensitive element. According to the display module, on one hand, the ambient light sensor and peripheral components thereof are eliminated, so that the structure of the module is simplified; on the other hand, the driving chip is used for detecting the electric signal of the photosensitive element so as to detect the ambient light information, data processing is not needed to be carried out through a processor of the electronic equipment to which the display module belongs, and the load power consumption of the processor is effectively reduced. The method has the advantages of simple structure, lower load, lower cost, higher yield and the like, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of display. More particularly, the present invention relates to a display module and a display device.
Background
Currently, with the development of the display technology field, the display device needs to be more adaptive to the public, for example, the brightness can be automatically adjusted under different environments. The existing display device can realize the function of automatically adjusting the brightness, however, the power consumed in the process of adjusting the brightness is large, so that the load of the display device is too high, and the occupied space of a component for realizing the function is large, so that the structure of the display device is complex, and the manufacturing cost is high.
Disclosure of Invention
The present invention is directed to a display module and a display device, so as to solve at least one of the problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a display module, which comprises a display panel, a driving chip and a flexible circuit board, wherein a photosensitive element is arranged on the flexible circuit board; the driving chip is connected with two ends of the photosensitive element through at least two leads so as to detect the ambient light information by detecting the electric signals of the photosensitive element.
Further, the photosensitive element is a photoresistor.
Further, the photosensitive element is a photodiode.
Further, the lead is connected to a redundant internal pin terminal of the driving chip, and the driving chip is used for applying voltage to the photosensitive element through the lead.
Furthermore, the lead is connected to a redundant external pin end of the driving chip, and the driving chip is used for applying voltage to the photosensitive element through the lead.
Further, the display module assembly still includes the power management chip, photosensitive element inserts the demonstration power supply circuit of power management chip, it includes to show power supply circuit:
the negative-pressure connecting wire is led out from the negative-pressure output end of the power management chip and is electrically connected to the display panel; and
the positive-pressure connecting wire is led out from the positive-pressure output end of the power management chip and is electrically connected to the display panel;
the drive chip comprises screen-rest power supply connecting wires which are respectively connected with the positive-pressure connecting wires and the negative-pressure connecting wires, and the leads are connected with the two ends of the photosensitive elements through the screen-rest power supply connecting wires.
Further, the photosensitive element is arranged at the negative pressure output end of the power management chip.
Further, the driving chip is configured to adjust the display brightness of the display panel according to the ambient light information.
The invention provides a display device, which comprises the display module provided by the first aspect of the invention.
Further, the display device is an electronic watch display device.
The invention has the following beneficial effects:
according to the technical scheme, the photosensitive element is arranged on the flexible circuit board, and the photosensitive element and the driving chip are utilized to form an electric connection loop for detecting the ambient light, so that the driving chip can detect the ambient light information in the scene where the current display module is located by detecting the electric signal change of the photosensitive element. According to the display module, on one hand, the ambient light sensor and peripheral components thereof are eliminated, so that the structure of the module is simplified; on the other hand, the driving chip is used for detecting the electric signal of the photosensitive element so as to detect the ambient light information, data processing is not needed to be carried out through a processor of the electronic equipment to which the display module belongs, and the load power consumption of the processor is effectively reduced. Therefore, the method has the advantages of simple structure, lower load, lower cost, higher yield and the like, and has wide application prospect.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic circuit diagram of a display module according to the prior art;
fig. 2 is a schematic circuit diagram of a display module according to an embodiment of the invention;
fig. 3 is a schematic circuit diagram of a display module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a display module according to an embodiment of the invention;
fig. 5 is a schematic circuit diagram of a display module according to an embodiment of the invention.
Detailed Description
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.
It is further noted that, in the description of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Taking a display device of an electronic timepiece as an example, a connection structure of a display module having an ambient light detection function in the display device of the electronic timepiece in the related art is shown in fig. 1. Its display module assembly includes: the display device comprises a flexible circuit board 3 ', a driving chip 2 ', a display panel1 ' and a main board 5 ', wherein the flexible circuit board 3 ' comprises a touch flexible circuit board TFPC31 ' with one end bonded with the display panel1 ', the flexible circuit board 3 ' further comprises a main flexible circuit board MFPC32 ' bonded with the driving chip 2 ', and the main board 5 comprises a processor 51 ' arranged thereon. As shown in fig. 1, in the Y direction, the driving chip 2 ' is respectively bonded and connected to the main flexible circuit board MFPC32 ' and the display Panel1 ', the ambient light sensor ALS4 ' is disposed on the touch flexible circuit board TFPC31 ', at least four peripheral devices 41 ' are disposed outside the ambient light sensor, and the ambient light sensor 4 ' is electrically connected to the processor CPU5 ' through a connection line 21 '. In another specific example, the ambient light sensor can also be disposed on the main flexible circuit board, electrically connected to the processor by a connection line. However, the prior art has the problems of large occupation space and complex structure of the ambient light sensor and the peripheral devices.
Further, the ambient light sensor 4 ' needs to be attached to the display panel1 ', and therefore, the flexible circuit board 3 ' is designed to have a special-shaped structure to meet the requirement. In the preparation process of the flexible circuit board, softening treatment is required, so that the reject ratio of the flexible circuit board after being attached to the flexible circuit board is high, and the flexible circuit board meeting the yield is difficult to prepare. The flexible circuit board has certain hardness, so that after the environmental light sensor is attached, the flexible circuit board is warped under the action of stress, and the difficulty of process manufacturing is increased.
Furthermore, the process of detecting the ambient light by using the structure comprises the following steps: the ambient light sensor 4 ' collects the intensity of ambient light, and transmits the light intensity information to the processor CPU51 ' through the integrated circuit bus IIC21 ' and the connection port 33 ', and the processor CPU51 ' obtains the ambient light information according to the light intensity information. In another specific example, the display module of the electronic watch further has a function of adjusting display brightness, the processor 51 ' outputs an adjustment instruction to the driving chip 2 ' according to the ambient light information, and the driving chip 2 ' adjusts the brightness of the display panel1 ' through the connection port 34 ' and the bound circuit. In the process, the communication between the ambient light sensor and the CPU and the data processing process of the CPU all cause the power consumption of the CPU to be increased sharply.
In view of this, an embodiment of the invention provides a display module and a display device.
One embodiment of the present invention provides a display device, including a display module and components such as a housing, wherein, as shown in fig. 2, the display module includes a display panel1, a driving chip 2 and a flexible circuit board 3, a photosensitive element 4 is disposed on the flexible circuit board 3; the driving chip 2 is connected to two ends of the photosensitive element 4 through at least two leads 21, so as to detect ambient light information by detecting an electrical signal of the photosensitive element 4.
According to the embodiment of the invention, the photosensitive element 4 is arranged on the flexible circuit board 3, and the photosensitive element 4 and the driving chip 2 are utilized to form an electric connection loop, so that the driving chip 2 can detect the ambient light state of the current display module by detecting the electric signal change of the photosensitive element 4. In one particular example, the electrical signal is a current in an electrical connection loop. The display module of the embodiment of the invention cancels the ambient light sensor and the peripheral components thereof, thereby simplifying the structure of the module; in addition, the display module provided by the embodiment of the invention detects the current of the photosensitive element through the driving chip to determine the ambient light information, and data processing is not required through the processor, so that the load power consumption of the processor is effectively reduced.
In an optional embodiment, the driving chip is further configured to adjust the display brightness of the display panel according to the ambient light information. The display module provided by the embodiment of the invention utilizes the electric connection loop which is formed by the lead and comprises the driving chip and the photosensitive element to detect the ambient light, and further can adjust the display brightness of the display panel according to the ambient light detection result, so that the brightness adjustment and intelligent display suitable for the ambient light are realized.
In one specific example, the driving chip can make the display panel in different display modes according to the detected ambient light information. For example: the display panel performs normal display, i.e., a normal display mode (NOR display mode), in response to a normal display instruction of the driving chip; when the ambient light brightness is strong, the display panel responds to an adjusting instruction of the driving chip to be switched from a normal display mode to a high-brightness display mode (HBM display mode) so as to realize high-brightness display under strong ambient light; and a screen saver mode (AOD display mode) in which the display panel part maintains a display state in a partial region in the screen saver state.
In an alternative embodiment, the light sensitive element is a light sensitive resistor.
In the embodiment of the invention, the photoresistor can be directly arranged on the flexible circuit board, and the occupied space of the element for realizing the light sensing function is greatly reduced by utilizing the characteristics of simple structure and small volume. More specifically, the photoresistor is electrically connected with the driving chip through a lead wire, and an electric connection loop of the driving chip and the photoresistor is formed.
In a specific example, for example, when the display module is applied to an electronic watch display device, when the electronic watch display device is transferred from indoor to an outdoor state with strong ambient light, the resistance of the photoresistor changes, further affecting the current in the loop, and the driving chip can directly acquire the change of the current, so that the display mode of the electronic watch display device can be switched and the display brightness can be adjusted according to the ambient light information determined by detecting the change of the current, high-brightness display under strong light can be realized, the experience of a user can be effectively improved, and the electronic watch display device has a wide application prospect.
It should be noted that the display module applied to the electronic watch display device in the embodiment of the present invention is only an exemplary one, that is, the application scenario of the display module in the embodiment of the present invention includes but is not limited to the electronic watch display device described above, for example, the display module in the embodiment of the present invention can also be applied to any product or component having an ambient light sensing function and a display brightness adjusting function, such as electronic paper, a folding mobile phone, a folding tablet computer, a tiled television, a tiled display, a tiled notebook computer, a large-sized digital photo frame, a large-sized navigator, and the like, which is not limited in this embodiment.
In another alternative embodiment, the photosensitive element is a photodiode. The photodiode of this embodiment is similar in principle to the previously described photoresistors. Specifically, the photodiode has unidirectional conductivity, and generates a small saturated reverse leakage current, i.e., a dark current, when no light is applied, and the photodiode is in an off state. When the photodiode is illuminated, the saturation reverse leakage current increases to form a photocurrent which varies with the variation of the incident light intensity. Therefore, the embodiment of the invention is set to enable the photosensitive diode to be in a conducting state, so that the photosensitive diode is conducted, current change is caused by ambient light irradiation, ambient light detection is carried out, display brightness is adjusted according to the obtained ambient light information, and display modes are switched.
The photosensitive elements of the embodiments of the present invention include the above-mentioned photosensitive resistors, photosensitive diodes, and the like, which can be directly applied to the circuit and have photosensitive characteristics, but do not include sensors such as an ambient light sensor, which need to perform data acquisition.
The scheme of the embodiment of the invention is explained by taking the display module applied to the electronic watch display device and the photosensitive element as the photosensitive resistor as an example.
In another alternative embodiment, as shown in fig. 2, the lead 21 is a data line and is connected to a redundant external pin terminal of the driving chip 2, and the driving chip 2 is configured to apply a voltage to the photosensitive element 4 through the lead 21.
In the embodiment of the invention, in the process of bonding the driving chip and the display panel to realize the electric connection between the driving chip and the display panel, the pin end at the bonding position of the driving chip and the display panel is the external pin end of the driving chip in the embodiment of the invention. Furthermore, in order to avoid redesigning the circuit structure of the display module, a Chip On Film (COF) packaging technology is used, i.e., the driving chip is disposed on the COF, and the driving chip and the COF are electrically connected, and the pin terminals of the COF are used as the pin terminals of the driving chip. As shown in fig. 2, the display panel1 is electrically connected to the flip-chip film pins on the side of the flip-chip film 24 close to the display panel, so that the display panel1 and the driving chip 2 are effectively bonded.
That is, when the display module applies the chip on film package technology, the external pin end (OLB) of the driving chip according to the embodiment of the present invention may be a pin end of the chip on film near one side of the display panel, in other words, the external pin end of the driving chip according to the embodiment of the present invention may be represented in fig. 2 as a plurality of pins in a dashed-line frame a at a connection point between the driving chip 2 and the data line 22, or as a plurality of pins in a dashed-line frame B at a bonding point between the chip on film 24 and the display panel 1.
Furthermore, the driving chip leads out data lines through external pin terminals to control the display of the display panel, and the resolution of the display panel determines the number of the data lines, for example, when the resolution of the display panel is 415 × 415, the number of the data lines may be 415 × 3, which includes data lines for controlling red, green, and blue sub-pixels, so that the number of the external pin terminals of the driving chip far exceeds the number of the data lines connected between the driving chip and the control panel, that is, on the basis that the display panel can realize normal display, the external pin terminals of the driving chip are not fully used, and the driving chip also has "redundant" external pin terminals. Similarly, when the display module employs the flip-chip package technology, the driving chip and the flip-chip electrically connected to the driving chip have "redundant" external pin terminals for use in the embodiments of the present invention.
Therefore, the embodiment utilizes the redundant external pin end in the driving chip, realizes the electric connection of the driving chip and the photosensitive element through the lead on the basis of not changing the structure of the driving chip, optimizes the circuit structure of the whole display module, and can realize the function of ambient light detection without adding a complex circuit structure on the basis of the existing structure.
In a specific example, as shown in fig. 2, in the Y direction, one end of the driving chip 2 is bonded to the display panel1, and the other end is bonded to the flexible circuit board 3, where the end of the driving chip bonded to the display panel1 is an external pin end. In the embodiment of the present invention, the driving chip is disposed on the Chip On Film (COF) by a Chip On Film (COF) packaging technology, and as can be seen from the foregoing, the external pin terminal of the driving chip also includes the external pin terminal of the COF packaging technology.
As shown in fig. 2, the photo-resistor 4 is disposed on the flexible circuit board 3. More specifically, in the Y direction, the flexible circuit board 3 includes a touch flexible circuit board 31 having one end bonded to the display panel1, and further includes a main flexible circuit board 32 bonded to the driving chip 2, and the photo resistor is disposed on the main flexible circuit board 32. At least two redundant external pin ends are respectively arranged at two sides of a data line 22 electrically connected with the display panel1 by the driving chip 2, a lead 21 is led out from the external pin ends, the lead 21 is respectively connected with two ends of the photosensitive resistor 4, and the driving chip 2 outputs voltage to the photosensitive resistor 4 to form an electric connection loop which comprises the driving chip 2 and the photosensitive resistor 4 and is used for directly detecting the ambient light information. In a specific example, the ambient light information detected by the driver chip 2 can also be output to the processor through the connection port 34, so that the processor can implement other functions according to the ambient light information.
In another specific example, as shown in fig. 3, the photo-resistor 4 is disposed on the main flexible circuit board 32, at least two redundant external pin terminals are respectively disposed on the same side of the driving chip 2 connected to the data line 22 of the display panel1, the lead 21 is led out from the external pin terminals, the lead 21 is respectively connected to two ends of the photo-resistor 4, and the driving chip 2 outputs a voltage to the photo-resistor 4 to form an electrical connection loop between the driving chip 2 and the photo-resistor 4.
According to the embodiment of the invention, by utilizing the characteristic that the photoresistor responds to the change of the light intensity change resistance value, when the ambient light changes, the photoresistor directly influences the current of the electric connection loop, the driving chip can directly realize the ambient light detection function according to the current change, and the whole ambient light detection process does not need a processor for data processing, and the ambient light information can be obtained only by detecting the current change through the driving chip, so that the detection efficiency is effectively improved, the load of the processor can be greatly reduced, the whole load loss of the display module is effectively reduced, and the display module has wide application prospect.
The embodiment of the invention can flexibly select the position of the external pin, effectively optimize the circuit structure, and a person skilled in the art should set the position of the external pin end according to practical application to form an electric connection loop between the driving chip and the photoresistor as a design criterion, which is not described herein again.
It should be noted that, in the embodiments of the present invention, the flexible circuit board includes the main flexible circuit board and the touch flexible circuit board as an exemplary illustration, and the embodiments of the present invention do not limit the specific type of the flexible circuit board, and form an electrical connection loop between the driving chip and the photo resistor as a design criterion, which is not described herein again.
Further, the driving chip of the embodiment of the invention is further configured to apply a voltage to the photosensitive element through the lead. Specifically, the electronic timepiece display device of the embodiment of the invention has different display modes, for example: the normal display mode, the highlight display mode and the screen saver mode are described above. Therefore, the driving chip is also used for applying a set voltage to the photosensitive element through the lead wire, so that the switching of different display modes is realized.
Specifically, the driving chip sets a first set voltage and a second set voltage to two ends of the photosensitive element respectively, and the driving chip switches the display panel to enter or exit the HBM mode according to the detected current change of the photosensitive element, so that brightness adjustment and display mode switching under the light sensation detection function are realized. In a specific example, a register for directly controlling the brightness change of the display panel is arranged in the driving chip, and the register can directly adjust the display brightness of the display panel or switch the display mode according to the current change detected by the driving chip, for example, the register with the register address of 51. In another specific example, the driving chip can also directly output a display instruction to cause the display panel to enter or exit the HBM mode.
It should be noted that, the specific structure, function, and the like of the register provided in the specific example of the present invention have no special requirements, and the specific values of the first setting voltage and the second setting voltage in the embodiment of the present invention also have no special requirements, and those skilled in the art should perform setting according to the actual application in combination with the overall function of the display module, which is not described herein again. In another alternative embodiment, the leads 21 are connected to redundant internal pin terminals of the driver chip 2. Specifically, as shown in fig. 4, in the Y direction, one end of the driving chip 2 is bonded to the display panel1, and the other end is bonded to the main flexible circuit board 32, where the end bonded to the main flexible circuit board 32 is an inner pin end.
In the embodiment of the present invention, the pin end at the bonding connection between the driver chip and the flexible circuit board is the internal pin end (ILB) of the driver chip in the embodiment of the present invention. Furthermore, the chip on film packaging technology is still utilized to arrange the driving chip on the chip on film, and the pin end of the chip on film can be used as the pin end of the driving chip in the same way as the external pin end of the driving chip. As shown in fig. 4, the main flexible circuit board 32 is electrically connected to the flip-chip film pin end of the flip-chip film 24 near the main flexible circuit board, so as to effectively bond the display panel1 and the main flexible circuit board 32.
That is, when the display module applies the flip-chip package technology, the internal connection pin end of the driving chip in the embodiment of the present invention may be a pin end of the flip-chip on a side close to the main flexible display panel, in other words, the internal connection pin end of the driving chip in the embodiment of the present invention may be represented in fig. 2 as a plurality of pins in a dashed-line frame C on a side close to the main flexible circuit board 32 of the driving chip 2, or as a plurality of pins in a dashed-line frame D where the driving chip 2 and the main flexible circuit board 32 are bonded.
Furthermore, the number of the internal pin terminals of the driving chip far exceeds the number of pins used for connecting the driving chip and the main flexible circuit board, that is, on the basis of effective bonding of the driving chip and the flexible circuit board, the internal pin terminals of the driving chip are not completely used, and the driving chip also has redundant internal pin terminals. Similarly, when the display module employs the flip-chip package technology, the driving chip and the flip-chip electrically connected to the driving chip have "redundant" internal pin terminals for use in the embodiments of the present invention.
Therefore, the embodiment of the invention utilizes the redundant internal pin terminals to realize the electric connection between the driving chip and the photosensitive element through the lead on the basis of not changing the structure of the driving chip, and the driving chip applies voltage to the photosensitive resistor so as to realize the loop conduction between the driving chip and the photosensitive element.
The embodiment of the invention optimizes the structure of the whole display module, and can realize the detection of the ambient light without adding a complex circuit structure on the basis of the existing structure. In addition, the embodiment of the invention utilizes the characteristic that the photoresistor responds to the change of the light intensity change resistance value, when the ambient light changes, the photoresistor directly influences the current of the electric connection loop, the driving chip can directly realize the light sensing function according to the current change, the whole ambient light detection process does not need a processor for data processing, and the data processing can be realized only by detecting the current change through the driving chip, so that the detection efficiency of the whole ambient light detection process is effectively improved, the load of the processor can be greatly reduced, the whole load loss of the display module is effectively reduced, and the invention has wide application prospect.
Further, the driving chip of the embodiment of the present invention is further configured to apply a set voltage to the photosensitive element through the lead, so as to implement switching between different display modes, for example, switching between a highlight display mode and a normal display mode; or realize the adjustment of display brightness, such as the adjustment of display brightness in the normal display mode, and the adjustment of display brightness in the highlight display mode. Specifically, the driving chip sets a first setting voltage and a second setting voltage to the two ends of the photosensitive element respectively, and the driving chip switches the display panel to enter or exit the HBM mode according to the current change of the electrical connection loop including the photosensitive element, so that the intelligent switching display mode under the ambient light detection function is realized. In a specific example, the embodiment of the present invention may directly adjust the display brightness of the display panel through the aforementioned register with address 51, so as to perform switching between two display modes or adjusting the display brightness. In another specific example, the driving chip can also directly output a display instruction to cause the display panel to enter or exit the HBM mode. In another specific example, when the ambient light intensity in a room varies within a certain range, the driving chip can adjust the display brightness of the display panel in the normal display mode.
In the embodiment of the invention, the whole display mode switching (such as switching between a highlight display mode and a normal display mode) and the display brightness adjusting process (such as the adjusting process in the normal display mode and the adjusting process in the highlight display mode) do not need a processor for data processing, and the current change obtained by detection of the driving chip can be realized only, so that the detection efficiency of the whole environment light detection process is effectively improved, the display brightness can be intelligently adjusted, the display mode can be intelligently switched, the load of the processor is greatly reduced, the whole load loss of the display module is effectively reduced, and the display module has wide application prospect.
In an optional embodiment, as shown in fig. 5, the display module further includes a power management chip 5, the photosensitive element 4 is connected to a display power supply circuit 51 of the power management chip 5, and the display power supply circuit includes:
a negative voltage connection line 511 led out from the negative voltage output end of the power management chip 5 and electrically connected to the display panel 1; and
a positive voltage connection line 512 which is led out from the positive voltage output end of the power management chip 5 and is electrically connected to the display panel 1;
the driving chip 2 further comprises screen-rest power supply connecting wires 23 respectively connected to the positive-pressure connecting wires 512 and the negative-pressure connecting wires 511, and the leads are connected to the two ends of the photosensitive elements 4 through the screen-rest power supply connecting wires 23.
For the brightness modes of different ambient light of the display module, in a normal mode (NOR mode), the display module displays with normal brightness; in a high brightness mode (HBM mode), the screen readability is improved in outdoor or under strong light; in the off-screen mode (AOD mode), the current consumption is reduced mainly in the standby state, so as to increase the battery life.
When the screen-saving mode is operated, the power consumption is low in the state, the driving chip 2 can directly supply power to the display panel1 through the screen-saving power supply loop, specifically, the positive-voltage connecting wire 512 connected with the display panel and the negative-voltage connecting wire 511 connected with the display panel are connected through the screen-saving power supply connecting wire 23, and therefore the screen-saving power supply loop is formed. In the normal display mode or the highlight display mode, a power supply signal is connected to the power management chip 5 through the voltage stabilization front end input port of the connection port 34, the power management chip 5 supplies power to the display panel1 through the display power supply loop 51, and at this time, the screen-off power supply connection line 23 is in a non-conduction state. That is, if the external environment is particularly bright, the screen saver power supply loop in the AOD mode does not participate in the brightness adjustment process when the NOR mode is switched to the HBM mode.
Therefore, the embodiment of the present invention forms the electrical connection loop for the ambient light detection including the driving chip 2, the photosensitive element 4 and the driving power chip 5 by connecting the photosensitive element 4 in the display power supply loop 51 of the driving power chip 5, and by using the information screen power supply connection line 23 in the off state in the normal display mode and the highlight display mode as a lead wire, and respectively connecting the connection lines to two ends of the photosensitive element 4. Therefore, the driving chip 2 can directly detect the current change of the photosensitive element 4 in the electrical connection loop caused by the resistance change generated by the ambient light, and directly determine whether the brightness switching is needed according to the current change, thereby realizing the brightness adjustment and the switching of the display mode according to the detected current change.
In the embodiment of the invention, the photosensitive element comprises a photosensitive resistor, a photosensitive diode and other types of electronic elements with photosensitive characteristics, which can be directly connected into a circuit.
In a specific example, taking the photo sensor as the photo resistor as an example, in the normal display mode state, the power management chip 5 outputs the power voltage to the driving chip 2, specifically, the positive voltage output terminal of the power management chip 5 outputs the positive driving voltage ELVDD, the negative voltage output terminal outputs the negative driving voltage ELVSS, the positive driving voltage ELVDD, and the negative driving voltage ELVSS, and the positive driving voltage ELVDD and the negative driving voltage ELVSS are output to the display panel1 through the display power supply circuit 51 to implement power supply in the normal display mode.
The screen-off power supply connecting wire 23 is connected to two ends of the photoresistor 4 as a lead, so as to form an electric connection loop comprising the photoresistor 4, the driving chip 2, the screen-off power supply connecting wire 23 as a lead and the power management chip 5. When the ambient light intensity changes, the resistance value of the photosensitive element changes, so that the current change of the electric connection loop is caused, further, the driving chip can directly acquire the current change, and the display mode switching or the display brightness adjustment is carried out according to the current change. For example, when the ambient light changes from weak to strong, the driving chip can directly change the value of the register for controlling the brightness inside the driving chip, for example, the value of the 51 register, and control the display panel to switch from the normal display mode to the highlight display mode. For another example, when the ambient light changes from bright to dark, the driving chip can control the display panel to switch from the high-brightness display mode to the normal display mode. For another example, when the intensity of the ambient light in the room varies within a certain range, the driving chip can adjust the display brightness of the display panel in the normal display mode.
In the embodiment of the invention, the whole processes of ambient light detection, display brightness adjustment and display mode switching do not need a processor for data processing, and can be realized only by detecting the current change through the driving chip, so that the detection, adjustment and switching efficiency is effectively improved, the load at the processor end can be greatly reduced, the whole load loss of the display module is effectively reduced, and the display module has wide application prospect.
Driving current I and positive driving voltage V of light emitting diode in display panelELVDDAnd a data line voltage VDATEIn connection with, namely: i ═ K/2 (V)ELVDD-VDATE)2Wherein K is a constant. That is, the photoresistor connected to the display power supply circuit will not affect the normal display of the display panel. That is, even if the resistance of the photo resistor changes with the ambient light intensity, and the current of the display power supply circuit changes, the current change does not affect the brightness adjusting mechanism of the driving chip.
In an alternative embodiment, as shown in fig. 5, the photosensitive element 4 is disposed at the negative voltage output terminal of the power management chip 5.
Considering the positive driving voltage V in the display power supply loop of the display moduleELVDDCan influence the displayThe photosensitive element is arranged in a circuit between the information screen power supply circuit and the positive voltage output end to prevent the resistance value change of the photosensitive element from influencing the positive driving voltage due to the current change caused by the ambient light so as to influence the display brightness of the display panel, so that the normal display of the display panel can be ensured on the basis of realizing the functions of detecting according to the ambient light and switching the display brightness, and the good display performance is realized.
It should be noted that the embodiment of the present invention does not limit the display module to adopt a scheme of detecting ambient light by using the information screen power supply circuit to adjust the brightness, and the embodiment of the present invention does not limit the display module to adopt the same; and connecting a pin of the driving chip with the photoresistor to form an electric connection loop so as to detect ambient light and adjust the brightness. Those skilled in the art should select a corresponding technical solution according to actual applications, and details are not described herein.
The display device applied to the electronic watch can effectively optimize the circuit structure of the electronic watch, effectively reduce the whole volume of the display device of the electronic watch, greatly reduce the load loss of a processor and has wide application prospect.
Besides being applied to an electronic watch, the display device provided in the embodiment of the present invention may also be any product or component having an ambient light sensing function, such as electronic paper, a foldable mobile phone, a foldable tablet computer, a spliced television, a spliced display, a spliced notebook computer, a large-size digital photo frame, a large-size navigator, and the like, which is not limited in this embodiment.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.
Claims (10)
1. A display module comprises a display panel, a driving chip and a flexible circuit board, and is characterized in that a photosensitive element is arranged on the flexible circuit board; the driving chip is connected with two ends of the photosensitive element through at least two leads so as to detect the ambient light information by detecting the electric signals of the photosensitive element.
2. The display module of claim 1, wherein the photosensitive element is a photoresistor.
3. The display module of claim 1, wherein the photosensitive element is a photodiode.
4. The display module of any one of claims 1-3, wherein the leads are connected to redundant internal pin terminals of the driver chip, the driver chip being configured to apply a voltage to the photosensitive elements via the leads.
5. The display module according to any one of claims 1-3, wherein the leads are connected to redundant external pin terminals of the driver chip, and the driver chip is configured to apply a voltage to the photosensitive element through the leads.
6. The display module assembly of any one of claims 1-3, wherein the display module assembly further comprises a power management chip, the photosensitive element is connected to a display power supply circuit of the power management chip, and the display power supply circuit comprises:
the negative-pressure connecting wire is led out from the negative-pressure output end of the power management chip and is electrically connected to the display panel; and
the positive-pressure connecting wire is led out from the positive-pressure output end of the power management chip and is electrically connected to the display panel;
the drive chip comprises screen-rest power supply connecting wires which are respectively connected with the positive-pressure connecting wires and the negative-pressure connecting wires, and the leads are connected with the two ends of the photosensitive elements through the screen-rest power supply connecting wires.
7. The display module of claim 6, wherein the photosensitive element is disposed at a negative voltage output terminal of the power management chip.
8. The display module of claim 1, wherein the driving chip is configured to adjust the display brightness of the display panel according to the ambient light information.
9. A display device comprising the display module according to any one of claims 1 to 8.
10. The display device according to claim 9, wherein the display device is an electronic watch display device.
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