CN109410821B - Display device and automatic charge sharing judgment method thereof - Google Patents
Display device and automatic charge sharing judgment method thereof Download PDFInfo
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- CN109410821B CN109410821B CN201811558055.9A CN201811558055A CN109410821B CN 109410821 B CN109410821 B CN 109410821B CN 201811558055 A CN201811558055 A CN 201811558055A CN 109410821 B CN109410821 B CN 109410821B
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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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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Abstract
The application discloses display device and automatic judgment charge sharing method, wherein the charge sharing method of the display device comprises the following steps: judging whether the preset multiple electric signal channels meet charge sharing conditions or not based on the current electric quantity conditions and the target electric quantity conditions of the preset multiple electric signal channels of the display device; and if so, carrying out charge sharing on a plurality of preset electric signal channels. By the above mode, power consumption of the display device can be reduced.
Description
Technical Field
The present disclosure relates to display technologies, and in particular, to a display device and an automatic charge sharing method thereof.
Background
When the display driving chip drives the data lines to the target pixel voltage, some data lines need to obtain charges from the power voltage so as to be charged to the target potential, and some data lines need to discharge the charges to the ground so as to be discharged to the target potential. If the data line needing to discharge the charges and the data line needing to obtain the charges are mutually short-circuited, the charge sharing can be realized, so that the data lines respectively reach the target levels.
Disclosure of Invention
In order to solve the above problem, the present application provides a display device and an automatic determination charge sharing method thereof, which can reduce power consumption of the display device.
The technical scheme adopted by the application is as follows: provided is a charge sharing method for automatically judging a display device, the charge sharing method including: judging whether the preset multiple electric signal channels meet charge sharing conditions or not based on the current electric quantity conditions and the target electric quantity conditions of the preset multiple electric signal channels of the display device; and if so, carrying out charge sharing on a plurality of preset electric signal channels.
Another technical scheme adopted by the application is as follows: a display device is provided, which includes a display panel, a digital encoding circuit, and a driving circuit; the digital coding circuit judges whether the preset multiple electric signal channels meet the charge sharing condition or not based on the current electric quantity condition and the target electric quantity condition of the preset multiple electric signal channels of the display device, and the driving circuit is used for driving the display panel according to the judgment result of the digital coding circuit.
The charge sharing method of the display device comprises the following steps: judging whether the preset multiple electric signal channels meet charge sharing conditions or not based on the current electric quantity conditions and the target electric quantity conditions of the preset multiple electric signal channels of the display device; and if so, carrying out charge sharing on a plurality of preset electric signal channels. Through the mode, the situation of charge sharing is different from the situation of charge sharing in the prior art, but the judgment is carried out based on the electric quantity situation of each electric signal channel, so that the situations of power saving and power wasting in the prior art are avoided, the power can be saved all the time, and the reduction of the power consumption of the display device is facilitated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
FIG. 1 is a signal diagram illustrating the charge sharing is not performed;
FIG. 2 is a signal diagram illustrating a first charge sharing scheme;
FIG. 3 is a signal diagram illustrating a second charge sharing scheme;
fig. 4 is a schematic flowchart illustrating a first embodiment of an automatic charge sharing method for a display device according to the present disclosure;
fig. 5 is a schematic flowchart illustrating a second embodiment of an automatic charge sharing method for a display device according to the present disclosure;
FIG. 6 is a schematic flow chart of step 52 of FIG. 5;
FIG. 7 is a schematic flow chart illustrating weight value determination for odd electrical signal channels;
FIG. 8 is a schematic flow chart illustrating weight value determination for even electrical signal channels;
fig. 9 is a schematic flowchart illustrating a third embodiment of an automatic charge sharing method for a display device according to the present disclosure;
FIG. 10 is a schematic structural diagram of an embodiment of a display device provided in the present application;
FIG. 11 is a schematic diagram of a simulated gamma curve.
Detailed Description
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1 and 2, fig. 1 is a signal diagram illustrating the charge sharing is not performed, and fig. 2 is a signal diagram illustrating the first charge sharing.
Where Sn denotes an electrical signal input to the nth data line, Sn +2 denotes an electrical signal input to the (n + 2) th data line, line1 denotes a first clock cycle, and line2 denotes a second clock cycle.
Comparing fig. 1 and fig. 2, in the first clock cycle, both signal diagrams show that the data driving is performed by using the input electrical signal, and in the second clock cycle, as shown in fig. 2, the time of the original one clock cycle is divided into a "charge sharing" interval and a "data driving" interval, that is, in each clock cycle, the charge sharing operation is performed for a period of time first when the electrical signal is received from the front end, and then the data driving operation is performed.
Referring to fig. 3, fig. 3 is a signal diagram illustrating a second charge sharing method.
Comparing fig. 2 and fig. 3, the charge sharing is performed in the second clock cycle as shown in fig. 2, and the voltage of the (n + 2) th data line rises from V1 to V2, so that the power saving effect can be achieved, and the charge sharing is performed in the second clock cycle as shown in fig. 3, and the power is consumed more on the contrary because the (n + 2) th data line holds V2 and the (n + 2) th data line holds V1.
How to determine whether charge sharing is needed is described in several embodiments below.
As shown in fig. 4, fig. 4 is a schematic flowchart of a first embodiment of an automatic charge sharing method for a display device according to the present application, where the method includes:
step 41: whether the preset multiple electric signal channels meet the charge sharing condition is judged based on the current electric quantity condition and the target electric quantity condition of the preset multiple electric signal channels of the display device.
When the determination result of step 41 is yes, step 42 is executed. If the determination result in step 41 is negative, no charge sharing is performed.
The current power condition may be a power condition of a current clock cycle, and the target power condition may be a power condition of a next clock cycle.
It will be appreciated that a plurality of gate lines and a plurality of data lines (electrical signal paths) cross to form a respective plurality of pixels of the array, with one data line driving a first pixel during a first clock cycle and a second pixel during a second clock cycle.
Optionally, in an embodiment, if the electrical signal of one data line in the first clock cycle is V2, and the electrical signal in the second clock cycle is V1(V2 > V1), then if the data line leaks charges to ground according to the existing driving method, in this case, the data line can perform charge sharing on other data lines, and it can be determined that the data line satisfies the charge sharing condition.
Optionally, in another embodiment, if the electrical signal of one data line in the first clock cycle is V2, and the electrical signal of the second clock cycle is also V2, in this case, the data line does not need to perform charge sharing on other data lines, and does not need to perform charge sharing on the data line, it may be determined that the data line does not satisfy the charge sharing condition.
Alternatively, in another embodiment, if the electrical signal of one data line in the first clock cycle is V1 and the electrical signal in the second clock cycle is V2, then if the data line gets charges from the power source according to the existing driving method, in this case, the data line can receive charge sharing of other data lines, and it can be determined that the data line satisfies the charge sharing condition.
Optionally, in another embodiment, if the electrical signal of one data line in the first clock cycle is V1, and the electrical signal of the second clock cycle is also V1, in this case, the data line does not need to perform charge sharing on other data lines, and does not need to perform charge sharing on the data line, it may be determined that the data line does not satisfy the charge sharing condition.
It can be understood that after judging whether each electrical signal channel meets the charge sharing condition, the judgment result of each electrical signal can be counted to determine whether a plurality of preset electrical signal channels meet the charge sharing condition.
Optionally, a percentage threshold may be set, and when a channel exceeding the percentage threshold in the preset plurality of electrical signal channels meets the charge sharing condition, it is determined that the preset plurality of electrical signal channels meet the charge sharing condition. For example, the percentage threshold may be set at 50%.
Step 42: and carrying out charge sharing on a plurality of preset electric signal channels.
The method for sharing the electric charge of the electronic device includes performing charge sharing on a plurality of preset electric signal channels, that is, performing short circuit on the plurality of preset electric signal channels, so as to perform charge sharing, and the specific method for sharing the electric charge may refer to the above-mentioned manner of fig. 1 to 3, which is not described herein again.
Different from the situation in the prior art, the charge sharing method of the display device provided by the embodiment includes: judging whether the preset multiple electric signal channels meet charge sharing conditions or not based on the current electric quantity conditions and the target electric quantity conditions of the preset multiple electric signal channels of the display device; and if so, carrying out charge sharing on a plurality of preset electric signal channels. Through the mode, the situation of charge sharing is different from the situation of charge sharing in the prior art, but the judgment is carried out based on the electric quantity situation of each electric signal channel, so that the situations of power saving and power wasting in the prior art are avoided, the power can be saved all the time, and the reduction of the power consumption of the display device is facilitated.
Referring to fig. 5, fig. 5 is a schematic flowchart illustrating a second embodiment of an automatic charge sharing method for a display device according to the present application, the method including:
step 51: the method comprises the steps of obtaining the current electric quantity condition and the target electric quantity condition of a plurality of preset electric signal channels of a display device.
Wherein the electrical condition may be a driving voltage. Specifically, the current power condition is the driving voltage of the current clock cycle, and the target power condition is the driving voltage of the next clock cycle.
Step 52: and determining the weight values of a plurality of preset electric signal channels of the display device based on the current electric quantity condition and the target electric quantity condition.
As shown in fig. 6, fig. 6 is a schematic flowchart of step 52 in fig. 5, and step 52 may specifically include:
step 511: and determining the voltage average value of the voltages of the preset plurality of electric signal channels in the current clock period.
Specifically, it is required to obtain a voltage of a current clock cycle and a voltage of a next clock cycle of each of the plurality of preset electrical signal channels, and then calculate a voltage average value by using the voltage of the current clock cycle of each of the plurality of preset electrical signal channels.
Step 512: and respectively determining the sub-weight value of each electric signal channel based on the voltage of the current clock cycle, the voltage of the next clock cycle and the voltage average value of each electric signal channel.
In some display devices, the electrical signal channels are classified and driven with different voltages.
Optionally, in an embodiment, the electrical signal channels are divided into odd channels and even channels, and the driving voltages of the two channels are different. The following describes the determination of different types of channels by using two embodiments.
As shown in fig. 7, fig. 7 is a schematic diagram illustrating a flow of determining weight values of odd-numbered electrical signal channels, and the method includes:
step 71: and judging whether the voltage of the current clock period of the target electric signal channel is greater than the average voltage value.
If the determination result in step 71 is yes, step 72 is executed; when the determination result of step 71 is no, step 75 is executed.
Step 72: and judging whether the voltage of the electric signal channel in the next clock period is larger than the average voltage value.
If the determination result of step 72 is yes, step 73 is executed, and if the determination result of step 72 is no, step 74 is executed.
Step 73: and determining the sub-weight value of the target electric signal channel as a preset first weight value.
Step 74: and determining the sub-weight value of the target electric signal channel as a preset second weight value.
Step 75: and judging whether the voltage of the target electric signal channel in the next clock cycle is greater than the voltage of the target electric signal channel in the current clock cycle.
If the determination result in step 75 is yes, step 76 is executed; when the determination result of step 75 is no, step 77 is executed.
Step 76: and determining the sub-weight value of the target electric signal channel as a preset third weight value.
Step 77: and determining the sub-weight value of the target electric signal channel as a preset second weight value. The second weight value in this step is the same as the second weight value in step 74 described above.
The first weight value indicates that charge sharing is not performed, the second weight value indicates that charge sharing is not required, and the third weight value indicates that charge sharing is performed.
Optionally, in an embodiment, the third weight value is greater than the second weight value, and the second weight value is greater than the first weight value.
As shown in fig. 8, fig. 8 is a schematic diagram illustrating a flow of determining weight values of even-numbered electrical signal channels, the method includes:
step 81: and judging whether the voltage of the current clock period of the target electric signal channel is greater than the average voltage value.
If the determination result in step 81 is yes, step 82 is executed; when the determination result of step 81 is no, step 85 is executed.
Step 82: and judging whether the voltage of the target electric signal channel in the next clock period is smaller than the average voltage value.
If the determination result of step 82 is yes, step 83 is executed, and if the determination result of step 82 is no, step 84 is executed.
Step 83: and determining the sub-weight value of the target electric signal channel as a preset first weight value.
Step 84: and determining the sub-weight value of the target electric signal channel as a preset second weight value.
Step 85: and judging whether the voltage of the target electric signal channel in the next clock cycle is greater than the voltage of the target electric signal channel in the current clock cycle.
If the determination result in step 85 is yes, step 86 is executed; when the determination result of step 85 is no, step 87 is executed.
Step 86: and determining the sub-weight value of the target electric signal channel as a preset third weight value.
Step 87: and determining the sub-weight value of the target electric signal channel as a preset second weight value. The second weight value in this step is the same as the second weight value in step 84 described above.
The first weight value indicates that charge sharing is not performed, the second weight value indicates that charge sharing is not required, and the third weight value indicates that charge sharing is performed.
Optionally, in an embodiment, the third weight value is greater than the second weight value, and the second weight value is greater than the first weight value.
Step 513: and summing the sub-weight values of each electric signal channel to obtain the weight values of a plurality of preset electric signal channels.
Step 53: and judging whether the weight value is greater than a set threshold value.
The set threshold may be obtained based on actual needs or multiple tests, which are not described herein.
Step 54: and determining that the plurality of preset electric signal channels meet the charge sharing condition, and carrying out charge sharing on the plurality of preset electric signal channels.
Referring to fig. 9, fig. 9 is a schematic flowchart illustrating a third embodiment of an automatic determination charge sharing method of a display device according to the present application, which is described below.
1. When the POL is equal to 1, the current scanning direction is mainly determined, and when the POL is equal to 1, the scanning is performed in the forward direction, and when the POL is equal to 0, the scanning is performed in the reverse direction, in this embodiment, the POL is equal to 1 as an example, and when the POL is equal to 0, the scanning can be performed by analogy, and details are not described here.
2. It is determined whether the current electrical signal channel type is an ODD channel (ODD) or an EVEN channel (EVEN).
3. And acquiring the weight value of the odd channel.
1) The voltage average avg (line n) of the current clock cycle of each channel is obtained.
2) Judging that line n is more than AVG.
3) And when line n is less than or equal to AVG, judging that line n +1 is greater than line n.
4) When line n +1 is less than or equal to line n, determining the sub-weight value W ═ b (second weight value) of the channel.
5) When line n +1 > line n, the sub-weight value W ═ c (third weight value) of the channel is determined.
6) When line n > AVG, line n +1 > AVG is judged.
7) And when line n +1 is less than or equal to AVG, determining the sub-weight value W-b of the channel.
8) When line n +1 > AVG, the sub-weight value W ═ a (first weight value) of the channel is determined.
9) And summing the sub-weight values of each odd electrical signal channel to obtain a weight value T ═ SUM (W).
4. At even channels, their weight values are obtained.
1) The voltage average avg (line n) of the current clock cycle of each channel is obtained.
2) Judging that line n is more than AVG.
3) When line n > AVG, it is judged that line n +1 < AVG.
4) When line n +1 < AVG, determining the sub-weight value W of the channel as a.
5) And when line n +1 is larger than or equal to AVG, determining the sub-weight value W-b of the channel.
6) And when line n is less than or equal to AVG, judging that line n +1 is greater than line n.
7) When line n +1 > line n, the sub-weight value W ═ c of the channel is determined.
8) And when line n +1 is less than or equal to line n, determining the sub-weight value W-b of the channel.
9) And summing the sub-weight values of each even electrical signal channel to obtain a weight value T ═ SUM (W).
5. Then, T > d is judged (threshold is set).
If T is larger than d, charge sharing is needed to be carried out on the channels, and if T is smaller than or equal to d, charge sharing is not needed to be carried out on the channels.
Different from the above-mentioned embodiment, this embodiment gives a weighted value based on the voltage condition of every signal channel and votes, summarizes the weight of a plurality of signal channels of telecommunication in order to judge whether need carry out charge sharing to a plurality of signal channels of telecommunication, can just carry out charge sharing under the condition that most passageway need charge sharing like this, avoided in the prior art power saving often, the condition of power consumption often, can accomplish power saving always, be favorable to reducing display device's consumption.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an embodiment of a display device provided in the present application, where the limiting device includes a display panel 101, a driving circuit 102, and a digital coding circuit 103.
The digital encoding circuit 103 determines whether the preset multiple electrical signal channels satisfy the charge sharing condition based on the current electrical quantity condition and the target electrical quantity condition of the preset multiple electrical signal channels of the display device, and the driving circuit 102 is configured to drive the display panel 101 according to the determination result of the digital encoding circuit 103.
It can be understood that, when the coding program in the digital coding circuit 103 in this embodiment runs, the method steps in the above embodiments are performed, and are not described here again.
Optionally, in another embodiment, an analog gamma signal, that is, an analog gamma correction curve is stored in the driving circuit 102, and a curve relationship of the analog gamma correction curve with a digital code is non-linear, in this embodiment, a Digital Gamma Correction (DGC) is introduced, a corresponding relationship is established between an 8-bit analog gamma signal and a 10-bit digital gamma signal, and an extra 2-bit of the digital gamma is used to represent slope information of the analog gamma curve.
As shown in fig. 11, fig. 11 is a schematic diagram of an analog gamma curve, in which a dotted line represents the analog gamma curve and a solid line represents a digital gamma curve. This is done to the effect that near the middle voltage, the voltage difference represented by the same code difference is less than the voltages at the two ends, thereby causing inaccuracies in the operation.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (9)
1. An automatic charge sharing judgment method for a display device is characterized by comprising the following steps:
acquiring current electric quantity conditions and target electric quantity conditions of a plurality of preset electric signal channels of the display device;
determining weight values of a plurality of preset electric signal channels of the display device based on the current electric quantity condition and the target electric quantity condition;
judging whether the weight value is greater than a set threshold value;
if yes, determining that the preset electric signal channels meet the charge sharing condition;
and if so, carrying out charge sharing on the preset multiple electric signal channels.
2. The method of claim 1,
the current electric quantity condition is the voltage of the current clock cycle, and the target electric quantity condition is the voltage of the next clock cycle;
the step of determining weight values of a plurality of preset electric signal channels of the display device based on the current electric quantity condition and the target electric quantity condition comprises:
determining the voltage average value of the voltages of the preset multiple electrical signal channels in the current clock period;
respectively determining the sub-weight value of each electric signal channel based on the voltage of the current clock cycle, the voltage of the next clock cycle and the voltage average value of each electric signal channel;
and summing the sub-weight values of each electrical signal channel to obtain the weight values of the preset plurality of electrical signal channels.
3. The method of claim 2,
the preset plurality of electrical signal channels are a plurality of odd electrical signal channels;
the step of respectively determining the sub-weight value of each electrical signal channel based on the voltage of the current clock cycle, the voltage of the next clock cycle and the voltage average value of each electrical signal channel includes:
when the voltage of the current clock period of the electric signal channel is greater than the voltage average value, judging whether the voltage of the next clock period of the electric signal channel is greater than the voltage average value;
if so, determining that the sub-weight value of the target electric signal channel is a preset first weight value;
and if not, determining that the sub-weight value of the target electric signal channel is a preset second weight value.
4. The method of claim 3,
the method further comprises the following steps:
when the voltage of the current clock period of the target electric signal channel is smaller than the voltage average value, judging whether the voltage of the next clock period of the target electric signal channel is larger than the voltage of the current clock period of the target electric signal channel;
if so, determining that the sub-weight value of the target electric signal channel is a preset third weight value;
if not, determining that the sub-weight value of the target electric signal channel is the preset second weight value.
5. The method of claim 2,
the preset plurality of electrical signal channels are a plurality of even electrical signal channels;
the step of respectively determining the sub-weight value of each electrical signal channel based on the voltage of the current clock cycle, the voltage of the next clock cycle and the voltage average value of each electrical signal channel includes:
when the voltage of the current clock period of the electric signal channel is greater than the voltage average value, judging whether the voltage of the next clock period of the electric signal channel is less than the voltage average value;
if so, determining that the sub-weight value of the target electric signal channel is a preset first weight value;
and if not, determining that the sub-weight value of the target electric signal channel is a preset second weight value.
6. The method of claim 5,
the method further comprises the following steps:
when the voltage of the current clock period of the target electric signal channel is smaller than the voltage average value, judging whether the voltage of the next clock period of the target electric signal channel is larger than the voltage of the current clock period of the target electric signal channel;
if so, determining that the sub-weight value of the target electric signal channel is a preset third weight value;
if not, determining that the sub-weight value of the target electric signal channel is the preset second weight value.
7. The method of claim 1,
the step of sharing the charges of the preset plurality of electrical signal channels includes:
in the next clock cycle, the target electrical signal channel is subjected to charge sharing, and then the target electrical signal channel is subjected to electrical signal driving.
8. A display device is characterized by comprising a display panel, a digital coding circuit and a driving circuit;
the digital coding circuit determines weight values of a plurality of preset electric signal channels of the display device based on current electric quantity conditions and target electric quantity conditions of the plurality of preset electric signal channels of the display device, judges whether the weight values are larger than a set threshold value, if yes, the plurality of preset electric signal channels are determined to meet charge sharing conditions, and the driving circuit is used for driving the display panel according to the judgment result of the digital coding circuit.
9. The display device according to claim 8,
the driving circuit stores analog gamma signals and the corresponding relation between the analog gamma signals and the digital gamma signals, so that the digital gamma signals are output to correct the display pictures of the display panel.
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