CN110221729B - Driving method and device and display device - Google Patents
Driving method and device and display device Download PDFInfo
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- CN110221729B CN110221729B CN201910518120.3A CN201910518120A CN110221729B CN 110221729 B CN110221729 B CN 110221729B CN 201910518120 A CN201910518120 A CN 201910518120A CN 110221729 B CN110221729 B CN 110221729B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
The invention provides a driving method, a driving device and a display device, and relates to the technical field of display. According to the method, the load mode of the TDDI chip is adjusted according to the signals of the touch electrodes on the touch panel read by the reading module, when the TDDI chip is in a heavy load mode, the driving module is controlled according to the first clock signal to adjust the display duration of each row of pixels in the display panel to be the first display duration, when the TDDI chip is in a light load mode, the driving module is controlled according to the second clock signal to adjust the display duration of each row of pixels in the display panel to be the second display duration, and the second display duration is longer than the first display duration, so that the display duration distributed to each frame image by the TDDI chip is prolonged in the light load mode, the touch duration distributed to each frame image is reduced, and no idle state occurs in the touch duration; and moreover, the charging and discharging of each row of pixels are more sufficient, and the display effect of the touch display device is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method and device, and a display device.
Background
With the continuous development of Display technology, Touch Display devices are widely used, generally, a Touch panel and a Display panel in the Touch Display device are independently controlled by two chips, and in order to improve the Integration of the Touch Display device, a TDDI (Touch and Display Driver Integration) chip is generated.
The TDDI chip integrates functions of a touch chip and a display chip into a single chip, and generally has two load modes, namely a heavy load mode and a light load mode, where the data volume of a touch signal to be processed in the heavy load mode is large, the data volume of a touch signal to be processed in the light load mode is small, and in the two load modes, the TDDI chip allocates a fixed display duration and a fixed touch duration to each frame image.
However, in the light load mode, the TDDI chip needs to process a smaller amount of touch signals, which results in a longer touch duration allocated to each frame of image, and thus idle touch time may occur.
Disclosure of Invention
The invention provides a driving method, a driving device and a display device, and aims to solve the problem that an idle state can occur in a touch time period due to long touch time allocated to each frame of image by an existing TDDI chip in a light load mode.
In order to solve the above problems, the present invention discloses a driving method, which is applied to a touch display device, where the touch display device includes a touch display panel and a TDDI chip connected to the touch display panel, the touch display panel includes a display panel and a touch panel, the display panel includes a plurality of pixels arranged in an array, the touch panel includes a plurality of touch electrodes arranged in an array, and the TDDI chip includes a driving module and a reading module; the method comprises the following steps:
adjusting the load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module;
when the load mode of the TDDI chip is adjusted to be a heavy load mode, controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a first display duration;
when the load mode of the TDDI chip is adjusted to be a light load mode, controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a second display duration; the first display duration is less than the second display duration.
Optionally, the step of adjusting the load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module includes:
when the TDDI chip is in a heavy load mode and the fact that the signals of the touch electrodes on the touch panel read by the reading module in a preset time period are not changed is detected, adjusting the load mode of the TDDI chip to a light load mode;
when the TDDI chip is in a light load mode and the signal of the touch electrode on the touch panel read by the reading module is detected to be changed, the load mode of the TDDI chip is adjusted to be a heavy load mode.
Optionally, the touch display device further includes a frequency division module, and the step of controlling the driving module to adjust the display duration of each row of pixels in the display panel to a first display duration when the load mode of the TDDI chip is adjusted to a heavy load mode includes:
when the load mode of the TDDI chip is adjusted to be a heavy load mode, acquiring a first frequency division ratio;
acquiring a target clock signal with a target frequency;
controlling the frequency dividing module to divide the frequency of the target clock signal with the target frequency according to the first frequency dividing ratio to obtain a first clock signal with a first frequency;
and controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a first display duration according to the first clock signal.
Optionally, the touch display device further includes a frequency dividing module, and the step of controlling the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration when the load mode of the TDDI chip is adjusted to the light load mode includes:
when the load mode of the TDDI chip is adjusted to be a light load mode, acquiring a second frequency division ratio;
acquiring a target clock signal with a target frequency;
controlling the frequency dividing module to divide the frequency of the target clock signal with the target frequency according to the second frequency dividing ratio to obtain a second clock signal with a second frequency;
and controlling the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration according to the second clock signal.
Optionally, the touch display device further includes a spreading module, and before the step of obtaining the target clock signal with the target frequency, the touch display device further includes:
and inputting the reference clock signal into the spread spectrum module, and outputting to obtain a target clock signal with a target frequency.
Optionally, the spreading module includes a phase-locked loop, a counter and a gate connected in sequence, the step of inputting the reference clock signal to the spreading module and outputting a target clock signal with a target frequency includes:
inputting a reference clock signal into the phase-locked loop, and outputting to obtain a specified clock signal with specified frequency;
inputting the appointed clock signals with appointed frequency into the counter, and outputting to obtain a plurality of clock signals with appointed frequency; a phase difference exists between the plurality of clock signals with the specified frequency;
and selecting corresponding clock signals from the plurality of clock signals with the appointed frequency in sequence according to a preset control word, inputting the clock signals into the gate, and outputting to obtain target clock signals with the target frequency.
Optionally, after the step of adjusting the load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module, the method further includes:
when the load mode of the TDDI chip is adjusted to be a heavy load mode, controlling the reading module to sequentially read signals of all touch electrodes on the touch panel;
and when the load mode of the TDDI chip is adjusted to be a light load mode, controlling the reading module to combine signals of the touch electrodes of each row or each column on the touch panel and reading the combined signals.
In order to solve the above problems, the present invention further discloses a driving device applied to a touch display device, where the touch display device includes a touch display panel and a TDDI chip connected to the touch display panel, the touch display panel includes a display panel and a touch panel, the display panel includes a plurality of pixels arranged in an array, the touch panel includes a plurality of touch electrodes arranged in an array, and the TDDI chip includes a driving module and a reading module; the driving device includes:
the load mode adjusting module is configured to adjust a load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module;
a first display duration adjustment module configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a first display duration when the load mode of the TDDI chip is adjusted to a heavy load mode;
a second display duration adjustment module configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration when the load mode of the TDDI chip is adjusted to the light load mode; the first display duration is less than the second display duration.
Optionally, the load mode adjusting module includes:
the light load mode adjusting submodule is configured to adjust the load mode of the TDDI chip to be the light load mode when the TDDI chip is in the heavy load mode and the fact that the signals of the touch electrodes on the touch panel read by the reading module are not changed within a preset time length is detected;
and the heavy load mode adjusting sub-module is configured to adjust the load mode of the TDDI chip to be a heavy load mode when the TDDI chip is in a light load mode and a change of the signal of the touch electrode on the touch panel read by the reading module is detected.
Optionally, the touch display device further includes a frequency dividing module, and the first display duration adjusting module includes:
a first frequency-division ratio obtaining sub-module configured to obtain a first frequency-division ratio when a load mode of the TDDI chip is adjusted to a heavy load mode;
a target clock signal acquisition submodule configured to acquire a target clock signal having a target frequency;
a first frequency division submodule configured to control the frequency division module to divide the target clock signal with the target frequency according to the first frequency division ratio to obtain a first clock signal with a first frequency;
and the first display duration adjusting submodule is configured to control the driving module to adjust the display duration of each row of pixels in the display panel to be the first display duration according to the first clock signal.
Optionally, the touch display device further includes a frequency dividing module, and the second display duration adjusting module includes:
a second division ratio obtaining sub-module configured to obtain a second division ratio when the load mode of the TDDI chip is adjusted to a light load mode;
a target clock signal acquisition submodule configured to acquire a target clock signal having a target frequency;
the second frequency division submodule is configured to control the frequency division module to divide the target clock signal with the target frequency according to the second frequency division ratio to obtain a second clock signal with a second frequency;
and the second display duration adjusting submodule is configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration according to the second clock signal.
Optionally, the touch display device further includes a frequency spreading module, and the driving device further includes:
and the target clock signal output module is configured to input the reference clock signal to the spread spectrum module and output a target clock signal with a target frequency.
Optionally, the spread spectrum module includes a phase-locked loop, a counter and a gate connected in sequence, and the target clock signal output module includes:
a reference clock signal input submodule configured to input a reference clock signal into the phase-locked loop, and output a specified clock signal having a specified frequency;
a designated clock signal input submodule configured to input the designated clock signal having the designated frequency into the counter, and output a plurality of clock signals having the designated frequency; a phase difference exists between the plurality of clock signals with the specified frequency;
and the target clock signal output submodule is configured to select a corresponding clock signal from the plurality of clock signals with the specified frequency in sequence according to a preset control word and input the clock signal into the gate, and output the clock signal with the target frequency.
Optionally, the driving device further includes:
a first signal reading module configured to control the reading module to sequentially read signals of the respective touch electrodes on the touch panel when a load mode of the TDDI chip is adjusted to a heavy load mode;
and the second signal reading module is configured to control the reading module to combine signals of the touch electrodes of each row or each column on the touch panel and read the combined signals when the load mode of the TDDI chip is adjusted to be a light load mode.
In order to solve the above problem, the present invention further discloses a touch display device, including the driving device.
Compared with the prior art, the invention has the following advantages:
and adjusting the load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module, controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a first display duration when the load mode of the TDDI chip is adjusted to be a heavy load mode, and controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a second display duration when the load mode of the TDDI chip is adjusted to be a light load mode, wherein the first display duration is less than the second display duration. When the TDDI chip is in a light load mode, the display duration of each row of pixels in the display panel is increased to a second display duration, so that the display duration distributed to each frame of image by the TDDI chip is increased in the light load mode, and the total duration of each frame of image is unchanged, so that the touch duration distributed to each frame of image is reduced, and idle time cannot occur in the touch time; and because the display duration of each row of pixels in the display time is improved, the charging and discharging of each row of pixels are more sufficient, and the display effect of the touch display device is improved.
Drawings
FIG. 1 shows a flow chart of a driving method of an embodiment of the invention;
FIG. 2 is a diagram illustrating a display duration and a touch duration in a heavy load mode according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a display duration and a touch duration in a light load mode according to an embodiment of the present invention;
FIG. 4 is a detailed flow chart of a driving method according to an embodiment of the present invention;
fig. 5 shows a schematic diagram of a spreading module in an embodiment of the invention;
FIG. 6 is a schematic diagram illustrating a signal for reading each touch electrode on the touch panel in a heavy load mode according to an embodiment of the invention;
FIG. 7 is a schematic diagram illustrating a signal for reading a touch electrode on a touch panel in a light load mode according to an embodiment of the invention;
fig. 8 is a block diagram showing a structure of a driving apparatus according to an embodiment of the present invention;
fig. 9 is a block diagram showing a specific structure of a driving apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The embodiment of the invention is mainly applied to a touch display device, the touch display device comprises a touch display panel and a TDDI chip connected with the touch display panel, the touch display panel comprises a display panel and a touch panel, the display panel comprises a plurality of pixels arranged in an array, the touch panel comprises a plurality of touch electrodes arranged in an array, and the TDDI chip comprises a driving module and a reading module.
The driving module in the TDDI chip is used for driving the display panel to display, and the reading module in the TDDI chip is used for reading signals of the touch electrode on the touch panel to identify whether a user touches the touch display device or not and the specific position of the user touch.
Example one
Referring to fig. 1, a flowchart of a driving method according to an embodiment of the present invention is shown, which may specifically include the following steps:
In the embodiment of the invention, the reading module in the TDDI chip reads the signal of the touch electrode on the touch panel, and adjusts the load mode of the TDDI chip according to the read signal of the touch electrode on the touch panel.
The load modes of the TDDI chip are two, namely a heavy load mode and a light load mode; the heavy load mode refers to a mode when the display panel and the touch panel are used at the same time, and the light load mode refers to a mode when the display panel is used but the touch panel is not used.
For example, a user touches the touch display device to refresh a web page, which requires using both the display panel and the touch panel, and at this time, the load mode of the TDDI chip may be set to the heavy load mode; the user watches the video by using the touch display device, only watches the display content most of the time, and basically does not need to touch the touch display device, and at this time, the load mode of the TDDI chip can be set to be the light load mode.
In the embodiment of the invention, when the load mode of the TDDI chip is adjusted to the heavy load mode, the first clock signal is sent to the driving module, and the driving module sequentially controls charging and discharging of each row of pixels in the display panel according to the first clock signal, so that each row of pixels in the display panel sequentially displays, and the display duration of each row of pixels in the display panel is adjusted to the first display duration.
Wherein, the first display duration refers to: in the heavy load mode, the TDDI chip displays the duration of each row of pixels in a frame of image, the duration of the frame of image is equal to N times the first duration, N is a positive number greater than 1, and the specific value of N is determined according to the specific driving mode of the driving module and the number of rows of pixels of the display panel.
As shown in fig. 2, in the heavy load mode, the TDDI chip allocates a display duration to each frame of image as T1, allocates a touch duration to each frame of image as T2, and allocates a first display duration to each row of pixels in each frame of image as T1.
The VSYNC is a pulse signal, and after one frame of image is displayed, namely after all pixels in each row are displayed, a VSYNC signal is generated and used for triggering the display panel to display the next frame of image; BP represents a time length between the input of a VSYNC signal and the display of a first row of pixels in the display panel, BNK represents a time length between the display of a last row of pixels in the display panel and the reading of a signal of a touch electrode, FP represents a time length between the reading of signals of all touch electrodes on the touch panel and the input of a next VSYNC signal, BP, BNK and FP can be understood as a time length of a buffering stage, and the stage does not control the touch display panel to execute corresponding operations.
103, when the load mode of the TDDI chip is adjusted to the light load mode, controlling the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration; the first display duration is less than the second display duration.
In the embodiment of the invention, when the load mode of the TDDI chip is adjusted to the light load mode, the second clock signal is sent to the driving chip, and the driving module sequentially controls charging and discharging of each row of pixels in the display panel according to the second clock signal, so that each row of pixels in the display panel sequentially display, and the display duration of each row of pixels in the display panel is adjusted to the second display duration.
The frequency of the second clock signal is less than that of the first clock signal; the second display period refers to: in the light load mode, the display duration of each row of pixels in one frame of image is equal to N times of the second display duration, N is a positive number greater than 1, and the specific value of N is determined according to the specific driving mode of the driving module, the row number of pixels of the display panel and the like.
As shown in fig. 3, in the light load mode, the TDDI chip allocates a display duration to each frame of image as T3, allocates a touch duration to each frame of image as T4, and allocates a second display duration to each row of pixels in each frame of image as T3.
The second display duration T3 of each row of pixels in each frame of image in the light load mode is longer than the first display duration T1 of each row of pixels in each frame of image in the heavy load mode, so that charging and discharging of each row of pixels are more sufficient, the display duration T3 of each frame of image in the light load mode is longer than the display duration T1 of each frame of image in the heavy load mode, the touch duration T4 of each frame of image in the light load mode is shorter than the touch duration T2 of each frame of image in the heavy load mode, and therefore idling does not occur in the touch duration.
In the embodiment of the invention, the load mode of the TDDI chip is adjusted according to the signal of the touch electrode on the touch panel read by the reading module, when the load mode of the TDDI chip is adjusted to be the heavy load mode, the driving module is controlled to adjust the display duration of each row of pixels in the display panel to be the first display duration, when the load mode of the TDDI chip is adjusted to be the light load mode, the driving module is controlled to adjust the display duration of each row of pixels in the display panel to be the second display duration, and the first display duration is less than the second display duration. When the TDDI chip is in a light load mode, the display duration of each row of pixels in the display panel is increased to a second display duration, so that the display duration distributed to each frame of image by the TDDI chip is increased in the light load mode, and the total duration of each frame of image is unchanged, so that the touch duration distributed to each frame of image is reduced, and idle time cannot occur in the touch time; and because the display duration of each row of pixels in the display time is prolonged, the charging and discharging of each row of pixels are more sufficient, and the display effect of the touch display device is improved.
Example two
Referring to fig. 4, a specific flowchart of a driving method according to an embodiment of the present invention is shown, which may specifically include the following steps:
In the embodiment of the invention, when the TDDI chip is in the heavy load mode, the reading module is controlled to read the signal of the touch electrode on the touch panel, and when it is detected that the signal of the touch electrode on the touch panel read by the reading module within the preset time period is not changed, the load mode of the TDDI chip is adjusted to the light load mode.
It should be noted that the preset duration may be set manually, such as 1s, 10s, etc.; the fact that the signals of the touch electrodes on the touch panel read by the reading module within the preset time length do not change means that: and the current values or the voltage values corresponding to the signals of the touch electrode read within the preset time length are equal.
When the load mode of the TDDI chip is adjusted to the light load mode, steps 408 to 411 are performed.
In the embodiment of the invention, when the TDDI chip is in the light load mode, the reading module is controlled to read the signal of the touch electrode on the touch panel, and when the signal of the touch electrode on the touch panel read by the reading module is detected to be changed, the load mode of the TDDI chip is adjusted to the heavy load mode.
It should be noted that the change of the signal of the touch electrode on the touch panel read by the reading module refers to: the current value or the voltage value corresponding to the currently read signal of the touch electrode is not equal to the current value or the voltage value corresponding to the previously read signal of the touch electrode.
When the load mode of the TDDI chip is adjusted to the heavy load mode, steps 404 to 407 are performed.
In an embodiment of the invention, the touch display device further includes a spread spectrum module, the spread spectrum module can convert the reference clock signal into clock signals with different frequencies, and the frequencies of the clock signals with different frequencies obtained by conversion of the spread spectrum module are all greater than the frequency of the reference clock signal.
The reference clock signal is a clock signal directly output by the crystal oscillator, the reference clock signal is input to the spread spectrum module, and a target clock signal with a target frequency meeting the requirement is output; wherein the target frequency of the target clock signal is greater than the frequency of the reference clock signal.
As shown in fig. 5, specifically, the spreading module includes a phase-locked loop 51, a counter 52 and a gate 53 connected in sequence, and step 403 specifically includes: inputting a reference clock signal into the phase-locked loop, and outputting to obtain a specified clock signal with specified frequency; inputting the appointed clock signals with appointed frequency into the counter, and outputting to obtain a plurality of clock signals with appointed frequency; a phase difference exists between the plurality of clock signals with the specified frequency; and according to a preset control word, sequentially selecting a corresponding clock signal from the plurality of clock signals with the appointed frequency, inputting the clock signal into the gate, and outputting to obtain a target clock signal with the target frequency.
The phase-locked loop 51 includes a phase detector 511, a filter 512, and an oscillator 513 connected in sequence, where the phase detector 511 is configured to compare a phase difference between a reference clock signal CLKin and a clock signal fed back from the oscillator 513, generate a voltage according to the phase difference, and output the voltage to the filter 512, the filter 512 performs high-frequency filtering on the voltage output by the phase detector 511, and outputs the filtered voltage to the oscillator 513, and the filtered voltage can control the oscillator 513 to output a specified clock signal with a specified frequency.
The counter 12 is triggered by m bitsDevice to represent 2mThe counter of each state inputs a specified clock signal with a specified frequency into the counter 12, and outputs a plurality of clock signals with the specified frequency, wherein phase differences exist among the plurality of clock signals with the specified frequency.
For example, if the counter 12 is a counter that uses 2-bit flip-flops to represent 4 states, the output will obtain 4 clock signals with specified frequencies, and the 4 clock signals with specified frequencies have a phase difference therebetween, which is equal to an integer multiple of the period/4.
The gate 53 includes an adder 531, an accumulator 532, a first gate switch 533, a second gate switch 534, a third gate switch 535, and a flip-flop 536, F represents a preset control word.
According to the preset control word F, the first gating switch 533 and the second gating switch 534 are controlled to sequentially select a corresponding clock signal from a plurality of clock signals with a specified frequency and output the clock signal to the third gating switch 535, the third gating switch 535 is controlled by the flip-flop 536, and under the control of the flip-flop 536, the third gating switch 535 selects the clock signals output by the first gating switch 533 and the second gating switch 534 again to obtain the target clock signal CLKout with the target frequency.
When the third gating switch 535 selects the clock signal output by the second gating switch 534 and the output clock signal is at a high level, the flip-flop 536 controls the third gating switch 535 to select the next time, and the next time the clock signal output by the first gating switch 533 is selected; when the clock signal output by the second gating switch 534 is selected by the third gating switch 535 and the output clock signal is low, the clock signal output by the second gating switch 534 continues to be output.
When the third gating switch 535 selects the clock signal output by the first gating switch 533 and the output clock signal is at a high level, the flip-flop 536 controls the third gating switch 535 to select the next time, and the next time the clock signal output by the second gating switch 534 is selected; when the clock signal output by the first gating switch 533 is selected by the third gating switch 535 and the output clock signal is at a low level, the clock signal output by the first gating switch 533 is continuously output.
The adder 531 takes the sum of F/2 and the value accumulated by the previous accumulator 533 as the control word of this time, and the accumulator 533 takes the sum of F and the value accumulated by the previous accumulator 533 as the control word of this time.
For example, the counter 12 outputs 4 clock signals with specified frequencies, the 4 clock signals with specified frequencies have phase differences, the phase differences are equal to integral multiples of period/4, the specified clock signal output by the phase-locked loop 51 is marked as 0, the clock signal with the specified clock signal with the period/4 is marked as 1, the clock signal with the specified clock signal with the period/2 is marked as 2, the clock signal with the specified clock signal with the period 3/4 is marked as 3, and so on; if the preset control word F is 3, the second gating switch 534 is controlled to output the designated clock signal marked as 0 for the first time; when the designated clock signal marked as 0 is at a high level, the flip-flop 536 controls the third gating switch 535 to select the clock signal output by the first gating switch 533, and at this time, the clock signal marked as 1 is selected by the first gating switch 533; when the clock signal marked as 1 is at a high level, the flip-flop 536 controls the third gating switch 535 to select the clock signal output by the second gating switch 534, at this time, the clock signal output by the second gating switch 534 is the clock signal marked as 3, and so on, the clock signal marked as 4 is output by the first gating switch 533 in sequence, the clock signal marked as 6 is output by the second gating switch 534, and so on, and finally the target clock signal with the target frequency is obtained.
When F/2 is not a positive integer, the remainder is directly ignored, and the resulting positive integer is referred to as F/2.
In step 404, when the load mode of the TDDI chip is adjusted to a heavy load mode, a first frequency-division ratio is obtained.
In an embodiment of the present invention, the touch display device further includes a frequency division module, where the frequency division module may reduce the frequency of the target clock signal by a frequency division ratio, and when the frequency division ratio is L, the frequency division module outputs a periodic signal to the target clock signal input to the frequency division module every L cycles, so that the frequency of the clock signal output by the frequency division module is reduced to 1/L of the frequency of the target clock signal.
For example, the frequency division ratio is 2, and the frequency division module outputs a periodic signal every two cycles of the target clock signal input to the frequency division module, so that the frequency of the clock signal output by the frequency division module is reduced to half of the frequency of the target clock signal.
When the load mode of the TDDI chip is adjusted to the heavy load mode, a first frequency-division ratio is obtained, which may be obtained according to an experiment.
In step 405, a target clock signal having a target frequency is obtained.
In the embodiment of the present invention, a target clock signal with a target frequency is obtained, that is, the target clock signal with the target frequency output by the spreading module in the obtaining step 403 is obtained.
In the embodiment of the invention, the frequency dividing module is controlled according to the first frequency dividing ratio to divide the target clock signal with the target frequency to obtain the first clock signal with the first frequency.
For example, the first frequency-division ratio is L1, the first frequency of the first clock signal is the target frequency of the target clock signal 1/L1.
In the embodiment of the present invention, a first clock signal with a first frequency is sent to a driving module, and the driving module sequentially controls charging and discharging of each row of pixels in a display panel according to the first clock signal with the first frequency, so that each row of pixels in the display panel sequentially displays, and the display duration of each row of pixels in the display panel is adjusted to be the first display duration.
In step 408, when the load mode of the TDDI chip is adjusted to the light load mode, a second frequency dividing ratio is obtained.
In the embodiment of the invention, when the load mode of the TDDI chip is adjusted to be the light load mode, a second frequency division ratio is obtained, and the second frequency division ratio can be obtained according to experiments; wherein the second frequency-division ratio is greater than the first frequency-division ratio.
In step 409, a target clock signal having a target frequency is obtained.
In the embodiment of the present invention, a target clock signal with a target frequency is obtained, that is, the target clock signal with the target frequency output by the spreading module in the obtaining step 403 is obtained.
In the embodiment of the invention, the frequency dividing module is controlled according to the second frequency dividing ratio to divide the target clock signal with the target frequency to obtain the second clock signal with the second frequency.
Since the second frequency-division ratio is greater than the first frequency-division ratio, the second frequency of the second clock signal is less than the first frequency of the first clock signal.
For example, the second frequency division ratio is L2, the second frequency of the second clock signal is the target frequency of the target clock signal 1/L2.
In the embodiment of the present invention, a second clock signal with a second frequency is sent to the driving module, and the driving module sequentially controls charging and discharging of each row of pixels in the display panel according to the second clock signal with the second frequency, so that each row of pixels in the display panel sequentially displays, and the display duration of each row of pixels in the display panel is adjusted to be the second display duration.
Since the second frequency of the second clock signal is less than the first frequency of the first clock signal, when the TDDI chip is in the light load mode, the power consumption caused by the clock signal for controlling the driving module to display is less than that in the heavy load mode, and the EMI (Electro Magnetic Interference) can be improved.
After step 402, the following steps are also performed:
step A1: and when the load mode of the TDDI chip is adjusted to be a heavy load mode, controlling the reading module to sequentially read the signals of all the touch electrodes on the touch panel.
When the load mode of the TDDI chip is adjusted to be the heavy load mode, the reading module is controlled to sequentially read signals of each touch electrode on the touch panel so as to detect the position touched by a user.
Referring to fig. 6, a schematic diagram of reading signals of each touch electrode on the touch panel in the heavy load mode according to an embodiment of the present invention is shown.
Wherein 61 is a TDDI chip, 62 is a touch display panel, 621 is a touch electrode on the touch panel in the touch display panel, when the load mode of the TDDI chip 61 is adjusted to a heavy load mode, signals of each touch electrode 621 on the touch panel are sequentially read, at this time, the data amount corresponding to the read signals of the touch electrodes 621 is large, and therefore, a long touch duration is required.
After step 401, the following steps are also performed:
step A2: and when the load mode of the TDDI chip is adjusted to be a light load mode, controlling the reading module to combine signals of the touch electrodes of each row or each column on the touch panel and reading the combined signals.
When the load mode of the TDDI chip is adjusted to the light load mode, the reading module is controlled to combine signals of the touch electrodes of each row or each column on the touch panel, and then the combined signals are read to detect whether a user touches the touch display device.
Referring to fig. 7, a schematic diagram of reading signals of touch electrodes on a touch panel in a light load mode according to an embodiment of the invention is shown.
When the load mode of the TDDI chip 61 is adjusted to the light load mode, since the user does not touch the touch display device in the light load mode, the signals of the touch electrodes 621 of each row or each column on the touch panel are combined and then the combined signals are read.
The TDDI chip normally processes signals of the touch electrode in a heavy load mode, the TDDI chip shortens the time for processing the signals of the touch electrode in a light load mode, redundant time is used for displaying, the two load modes of the TDDI chip can be freely switched, and when the two load modes are switched, the display panel, the touch panel and the TDDI chip normally work without influencing the display and touch functions of the touch display device.
It should be noted that the touch panel shown in fig. 6 and 7 is a touch panel in a self-capacitance mode, and the touch panel in the embodiment of the present invention only refers to a touch panel in a self-capacitance mode, when a user does not touch, a variation of a voltage value or a current value corresponding to a signal of the touch electrode 621 is 0, and when the user performs a touch operation, a coupling capacitance is formed between the user and the touch electrode 621, so that the variation of the voltage value or the current value corresponding to the signal of the touch electrode 621 is not 0.
In the embodiment of the invention, when the TDDI chip is in a heavy load mode, the driving module is controlled according to the first clock signal to adjust the display duration of each row of pixels in the display panel to the first display duration, when the TDDI chip is in a light load mode, the driving module is controlled according to the second clock signal to adjust the display duration of each row of pixels in the display panel to the second display duration, and the second display duration is greater than the first display duration, so that the display duration distributed to each frame of image by the TDDI chip is improved in the light load mode, and as the total duration of each frame of image is unchanged, the touch duration distributed to each frame of image is reduced, and no idle state occurs in the touch duration; in addition, the display duration of each row of pixels in the display time is prolonged, so that the charging and discharging of each row of pixels are more sufficient, and the display effect of the touch display device is improved; in addition, the second frequency of the second clock signal is less than the first frequency of the first clock signal, when the TDDI chip is in the light load mode, compared with the heavy load mode, the power consumption caused by the clock signal for controlling the driving module to display is less, and the EMI can be improved.
EXAMPLE III
Referring to fig. 8, a block diagram of a driving apparatus according to an embodiment of the present invention is shown.
The driving device 800 of the embodiment of the present invention is applied to a touch display device, where the touch display device includes a touch display panel and a TDDI chip connected to the touch display panel, the touch display panel includes a display panel and a touch panel, the display panel includes a plurality of pixels arranged in an array, the touch panel includes a plurality of touch electrodes arranged in an array, and the TDDI chip includes a driving module and a reading module; the driving apparatus 800 includes:
a load mode adjusting module 801 configured to adjust a load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module;
a first display duration adjustment module 802 configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a first display duration when the load mode of the TDDI chip is adjusted to the heavy load mode;
a second display duration adjustment module 803 configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration when the load mode of the TDDI chip is adjusted to the light load mode; the first display duration is less than the second display duration.
Referring to fig. 9, a detailed block diagram of a driving apparatus according to an embodiment of the present invention is shown.
On the basis of fig. 8, optionally, the load mode adjusting module 801 includes:
a light load mode adjusting sub-module 8011 configured to adjust the load mode of the TDDI chip to a light load mode when the TDDI chip is in the heavy load mode and it is detected that the signal of the touch electrode on the touch panel read by the reading module is not changed within a preset time period;
a heavy load mode adjusting sub-module 8012 configured to adjust the load mode of the TDDI chip to a heavy load mode when the TDDI chip is in a light load mode and a change in the signal of the touch electrode on the touch panel read by the reading module is detected.
Optionally, the touch display device further includes a frequency dividing module, and the first display duration adjusting module 802 includes:
a first frequency-division ratio obtaining sub-module 8021 configured to obtain a first frequency-division ratio when the load mode of the TDDI chip is adjusted to the heavy load mode;
a target clock signal acquisition submodule 8022 configured to acquire a target clock signal having a target frequency;
a first frequency division submodule 8023, configured to control the frequency division module to divide the target clock signal with the target frequency according to the first frequency division ratio, so as to obtain a first clock signal with a first frequency;
a first display duration adjustment submodule 8024 configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a first display duration according to the first clock signal.
Optionally, the touch display device further includes a frequency dividing module, and the second display duration adjusting module 803 includes:
a second division ratio obtaining sub-module 8031 configured to obtain a second division ratio when the load mode of the TDDI chip is adjusted to a light load mode;
a target clock signal acquisition submodule 8032 configured to acquire a target clock signal having a target frequency;
a second frequency division submodule 8033, configured to control the frequency division module to divide the frequency of the target clock signal with the target frequency according to the second frequency division ratio, so as to obtain a second clock signal with a second frequency;
a second display duration adjusting submodule 8034 configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration according to the second clock signal.
Optionally, the touch display device further includes a spread spectrum module, and the driving device 800 further includes:
and a target clock signal output module 804 configured to input the reference clock signal to the spread spectrum module, and output a target clock signal having a target frequency.
Optionally, the spread spectrum module includes a phase-locked loop, a counter, and a gate, which are connected in sequence, and the target clock signal output module 804 includes:
a reference clock signal input submodule 8041 configured to input a reference clock signal into the phase-locked loop, and output a specified clock signal having a specified frequency;
a designated clock signal input submodule 8042 configured to input the designated clock signal with the designated frequency into the counter, and output a plurality of clock signals with the designated frequency; a phase difference exists between the plurality of clock signals with the specified frequency;
and the target clock signal output submodule 8043 is configured to sequentially select a corresponding clock signal from the plurality of clock signals with the specified frequency according to a preset control word, input the corresponding clock signal into the gate, and output the corresponding clock signal with the target frequency.
Optionally, the driving device 800 further includes:
a first signal reading module 805 configured to control the reading module to sequentially read signals of the respective touch electrodes on the touch panel when the load mode of the TDDI chip is adjusted to a heavy load mode;
a second signal reading module 806 configured to control the reading module to combine signals of the touch electrodes of each row or each column on the touch panel and read the combined signals when the load mode of the TDDI chip is adjusted to a light load mode.
In the embodiment of the invention, the load mode of the TDDI chip is adjusted according to the signal of the touch electrode on the touch panel read by the reading module, when the load mode of the TDDI chip is adjusted to be the heavy load mode, the driving module is controlled to adjust the display duration of each row of pixels in the display panel to be the first display duration, when the load mode of the TDDI chip is adjusted to be the light load mode, the driving module is controlled to adjust the display duration of each row of pixels in the display panel to be the second display duration, and the first display duration is less than the second display duration. When the TDDI chip is in a light load mode, the display duration of each row of pixels in the display panel is increased to a second display duration, so that the display duration distributed to each frame of image by the TDDI chip is increased in the light load mode, and the total duration of each frame of image is unchanged, so that the touch duration distributed to each frame of image is reduced, and idle time cannot occur in the touch time; and because the display duration of each row of pixels in the display time is prolonged, the charging and discharging of each row of pixels are more sufficient, and the display effect of the touch display device is improved.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
Example four
The embodiment of the invention also provides a touch display device which comprises the driving device.
For specific description of the driving device, reference may be made to the description of the third embodiment, which is not repeated herein in this embodiment of the present invention.
In practical applications, the touch display device may be: any product or component with a touch display function, such as a mobile phone, a tablet computer, a display, a notebook computer, a navigator and the like.
In the embodiment of the invention, the load mode of the TDDI chip is adjusted according to the signal of the touch electrode on the touch panel read by the reading module, when the load mode of the TDDI chip is adjusted to be the heavy load mode, the driving module is controlled to adjust the display duration of each row of pixels in the display panel to be the first display duration, when the load mode of the TDDI chip is adjusted to be the light load mode, the driving module is controlled to adjust the display duration of each row of pixels in the display panel to be the second display duration, and the first display duration is less than the second display duration. When the TDDI chip is in a light load mode, the display duration of each row of pixels in the display panel is increased to a second display duration, so that the display duration distributed to each frame of image by the TDDI chip is increased in the light load mode, and the total duration of each frame of image is unchanged, so that the touch duration distributed to each frame of image is reduced, and idle time cannot occur in the touch time; and because the display duration of each row of pixels in the display time is prolonged, the charging and discharging of each row of pixels are more sufficient, and the display effect of the touch display device is improved.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, 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 like elements in a process, method, article, or apparatus that comprises the element.
The driving method, the driving device and the display device provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The driving method is applied to a touch display device, the touch display device comprises a touch display panel and a TDDI chip connected with the touch display panel, the touch display panel comprises a display panel and a touch panel, the display panel comprises a plurality of pixels arranged in an array, the touch panel comprises a plurality of touch electrodes arranged in an array, and the TDDI chip comprises a driving module and a reading module; the method comprises the following steps:
adjusting the load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module;
when the load mode of the TDDI chip is adjusted to be a heavy load mode, controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a first display duration;
when the load mode of the TDDI chip is adjusted to be a light load mode, controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a second display duration; the first display duration is less than the second display duration.
2. The method according to claim 1, wherein the step of adjusting the load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module comprises:
when the TDDI chip is in a heavy load mode and the signal of the touch electrode on the touch panel read by the reading module in a preset time period is detected to be unchanged, adjusting the load mode of the TDDI chip to a light load mode;
when the TDDI chip is in a light load mode and the signal of the touch electrode on the touch panel read by the reading module is detected to be changed, the load mode of the TDDI chip is adjusted to be a heavy load mode.
3. The method according to claim 1, wherein the touch display device further comprises a frequency division module, and the step of controlling the driving module to adjust the display duration of each row of pixels in the display panel to a first display duration when the load mode of the TDDI chip is adjusted to a heavy load mode comprises:
when the load mode of the TDDI chip is adjusted to be a heavy load mode, acquiring a first frequency division ratio;
acquiring a target clock signal with a target frequency;
controlling the frequency dividing module to divide the frequency of the target clock signal with the target frequency according to the first frequency dividing ratio to obtain a first clock signal with a first frequency;
and controlling the driving module to adjust the display duration of each row of pixels in the display panel to be a first display duration according to the first clock signal.
4. The method according to claim 1, wherein the touch display device further comprises a frequency division module, and the step of controlling the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration when the load mode of the TDDI chip is adjusted to the light load mode comprises:
when the load mode of the TDDI chip is adjusted to be a light load mode, acquiring a second frequency division ratio;
acquiring a target clock signal with a target frequency;
controlling the frequency dividing module to divide the frequency of the target clock signal with the target frequency according to the second frequency dividing ratio to obtain a second clock signal with a second frequency;
and controlling the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration according to the second clock signal.
5. The method according to claim 3 or 4, wherein the touch display device further comprises a spread spectrum module, and before the step of obtaining the target clock signal with the target frequency, the method further comprises:
and inputting the reference clock signal into the spread spectrum module, and outputting to obtain a target clock signal with a target frequency.
6. The method of claim 5, wherein the spread spectrum module comprises a phase-locked loop, a counter and a gate connected in sequence, and the step of inputting the reference clock signal to the spread spectrum module and outputting the target clock signal with the target frequency comprises:
inputting a reference clock signal into the phase-locked loop, and outputting to obtain a specified clock signal with specified frequency;
inputting the appointed clock signals with appointed frequency into the counter, and outputting to obtain a plurality of clock signals with appointed frequency; a phase difference exists between the plurality of clock signals with the specified frequency;
and according to a preset control word, sequentially selecting a corresponding clock signal from the plurality of clock signals with the appointed frequency, inputting the clock signal into the gate, and outputting to obtain a target clock signal with the target frequency.
7. The method according to claim 1, further comprising, after the step of adjusting the load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module, the step of:
when the load mode of the TDDI chip is adjusted to be a heavy load mode, controlling the reading module to sequentially read signals of all touch electrodes on the touch panel;
and when the load mode of the TDDI chip is adjusted to be a light load mode, controlling the reading module to combine signals of the touch electrodes of each row or each column on the touch panel and reading the combined signals.
8. The driving device is applied to a touch display device, the touch display device comprises a touch display panel and a TDDI chip connected with the touch display panel, the touch display panel comprises a display panel and a touch panel, the display panel comprises a plurality of pixels arranged in an array, the touch panel comprises a plurality of touch electrodes arranged in an array, and the TDDI chip comprises a driving module and a reading module; the driving device includes:
the load mode adjusting module is configured to adjust a load mode of the TDDI chip according to the signal of the touch electrode on the touch panel read by the reading module;
a first display duration adjustment module configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a first display duration when the load mode of the TDDI chip is adjusted to a heavy load mode;
a second display duration adjustment module configured to control the driving module to adjust the display duration of each row of pixels in the display panel to a second display duration when the load mode of the TDDI chip is adjusted to the light load mode; the first display duration is less than the second display duration.
9. The apparatus of claim 8, wherein the load mode adjustment module comprises:
the light load mode adjusting submodule is configured to adjust the load mode of the TDDI chip to be the light load mode when the TDDI chip is in the heavy load mode and the fact that the signals of the touch electrodes on the touch panel read by the reading module are not changed within a preset time length is detected;
and the heavy load mode adjusting sub-module is configured to adjust the load mode of the TDDI chip to be a heavy load mode when the TDDI chip is in a light load mode and a change of the signal of the touch electrode on the touch panel read by the reading module is detected.
10. A touch display device comprising the driving device according to claim 8 or 9.
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| CN112527144B (en) * | 2020-11-30 | 2024-01-23 | 厦门天马微电子有限公司 | Driving method of touch display device and touch display device |
| CN112540701A (en) * | 2020-12-11 | 2021-03-23 | 联想(北京)有限公司 | Data processing method, electronic device and storage medium |
| US11543916B2 (en) * | 2021-02-17 | 2023-01-03 | Himax Technologies Limited | Driver circuit for driving display panel having touch sensing function |
| CN112860125B (en) * | 2021-03-19 | 2024-04-16 | 京东方科技集团股份有限公司 | Touch display driving device and method and touch display device |
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