CN114708830B - Light emitting diode display panel and control method thereof - Google Patents
Light emitting diode display panel and control method thereof Download PDFInfo
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- CN114708830B CN114708830B CN202210518012.8A CN202210518012A CN114708830B CN 114708830 B CN114708830 B CN 114708830B CN 202210518012 A CN202210518012 A CN 202210518012A CN 114708830 B CN114708830 B CN 114708830B
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
A light emitting diode display panel and a control method thereof. The light emitting diode display panel has 2 M A gray scale value. The control method comprises the following steps. The first driving current and the first driving frequency are used for generating the brightness corresponding to the 1 st to a-th gray scale values. Generating a second driving current and a second driving frequency corresponding to the (a+1) -2 th driving voltage M -brightness of 1-level gray scale values. The first drive current is less than the second drive current or the first drive frequency is higher than the second drive frequency.
Description
Technical Field
The present disclosure relates to a display panel and a control method thereof, and more particularly, to a light emitting diode display panel and a control method thereof.
Background
With the development of display technology, a light emitting diode display panel is developed. The resolution of the led display panel is determined by the frame rate (frame rate), the driving frequency (GCLK frequency) and the number of scans. As shown in the following table, as the number of scans increases, the resolution (number of bits) of display decreases, and the discrimination at low gray scale becomes poor. If the number of scans is reduced and the resolution of the display is increased, the number of driver chips used is increased and the cost is increased.
List one
In order to prevent the number of driving chips from increasing, how to improve the resolution of low gray scale without increasing the resolution has become an important research and development direction in the industry.
Disclosure of Invention
The present disclosure relates to a light emitting diode display panel and a control method thereof, which reduce the brightness of low gray scale values to improve the discrimination of the low gray scale values.
According to an aspect of the present disclosure, a control method of a light emitting diode display panel is provided. The light emitting diode display panel has 2 M A gray scale value. The control method comprises the following steps. The first driving current and the first driving frequency are used for generating the brightness corresponding to the 1 st to a-th gray scale values. Generating a second driving current and a second driving frequency corresponding to the (a+1) -2 th driving voltage M -brightness of 1-level gray scale values. The first drive current is less than the second drive current or the first drive frequency is higher than the second drive frequency.
According to another aspect of the present disclosure, a light emitting diode display panel is provided. The LED display panel has the 2 nd M A gray scale value. The light emitting diode display panel comprises a source electrode driving circuit. The source electrode driving circuit comprises a current switching circuit, a frequency switching circuit and a control circuit. The current switching circuit is used for switching between a first driving current or a second driving current. The frequency switching circuit is used for switching between a first driving frequency or a second driving frequency. The control circuit is connected to the current switching circuit and the frequency switching circuit for controlling the current switching circuit and the frequency switching circuit to generate brightness corresponding to the 1 st to the a-th gray scale values with the first driving current and the first driving frequency and to generate brightness corresponding to the a+1-2 th gray scale values with the second driving current and the second driving frequency M -brightness of 1-level gray scale values. The first drive current is less than the second drive current or the first drive frequency is higher than the second drive frequency.
For a better understanding of the above and other aspects of the disclosure, reference is made to the following detailed description of embodiments, which is to be read in connection with the accompanying drawings, in which:
drawings
FIG. 1 is a graph showing the relationship between gray scale values and brightness according to an embodiment.
Fig. 2 illustrates a light emitting diode display panel according to an embodiment.
Fig. 3 shows a block diagram of a source driving circuit according to an embodiment.
Fig. 4 shows a diagram of a driving signal versus a scanning signal according to an embodiment.
Fig. 5 shows a flowchart of a control method of a light emitting diode display panel according to an embodiment.
Fig. 6 shows a comparison of three Gamma 2.2 curves.
Fig. 7 shows a graph of Gamma value distribution of the curves CV12 and CV13 according to fig. 6.
Reference numerals illustrate:
100: light emitting diode display panel
110: source electrode driving circuit
111: current switching circuit
1111: first current generator
1112: second current generator
1113: multiplexer
112: frequency switching circuit
1121: first frequency generator
1122: second frequency generator
1123: multiplexer
113: control circuit
114: displacement temporary storage circuit
115: temporary storage memory
116: scrambling circuit
117: output buffer circuit
118: regulating circuit
119: bit counting control circuit
120: scanning driving circuit
130: light emitting diode
a, b, n, x: numerical value
CS1: first control signal
CS2: second control signal
CV1, CV2, CV3, CV11, CV12, CV13, CV22, CV23: curve of curve
GCLK1: first driving frequency
GCLK2: second drive frequency
GP: level difference
Igain1: first drive current
Igain2: second drive current
L1, L2, L3: column of
OUT1-OUTm: an output terminal
S1: drive signal
S2: scanning signal
S110, S120, S130, S140, S150, S160, S170, S180, S190: step (a)
Ts: non-display time
Detailed Description
Referring to fig. 1, a graph of gray scale values versus brightness according to an embodiment is shown. As shown in the curve CV1 of fig. 1, the gray-scale value and the brightness have a linear relationship before the adjustment. When the number of bits is M, 2 is taken as a total M A gray scale value. The brightness corresponding to the 1 st to a-th gray scale values is high, so that the discrimination of the 1 st to a-th gray scale values is poor.
In one embodiment, as shown in the curve CV2, the present technology reduces the brightness of the 1 st to a-th gray-scale values, so that the brightness corresponding to the 1 st to a-th gray-scale values is reduced, and the discrimination of the 1 st to a-th gray-scale values is improved.
For example, with the a-th gray scale value as a boundary, the first driving current Igain1 and the first driving current GCLK1 are used for generating the brightness corresponding to the 1-a-th gray scale value for the 1-a-th gray scale value. For the a+1 to 2 th M -1 gray scale value, the second driving current Igain2 and the second driving current GCLK2 are used to generate the corresponding a+1-2 M -brightness of 1-level gray scale values. The luminance corresponding to the 1 st to a-th gradation values can be reduced in three ways:
(1) The first driving current Igain1 is smaller than the second driving current Igain2;
(2) The first driving frequency GCLK1 is higher than the second driving frequency GCLK2; or (b)
(3) The first driving current Igain1 is smaller than the second driving current Igain2 and the first driving frequency GCLK1 is higher than the second driving frequency GCLK2.
In another embodiment, in order to avoid the curve CV2 forming a step difference GP between the a-th gray level and the a+1-th gray level, the present technology further links the brightness corresponding to the a+1-th gray level with the brightness corresponding to the a-th gray level, as shown in the curve CV 3. That is, the present technique can control the PWM width of the luminance corresponding to the a+1th gray-scale value to be nT, so that the luminance corresponding to the a+1th gray-scale value is substantially equal to and slightly higher than the luminance corresponding to the a-th gray-scale value.
In addition, in order to allow the high gray-scale value to be complemented with the due luminance, the present technique increases the magnitude of the luminance change from the b-th gray-scale value.
For example, the PWM width increasing rate is controlled to be 1T for the 1 st to the b th gradation values with the b th gradation values as boundaries, so as to generate the luminances corresponding to the 1 st to the b th gradation values. For the (b+1) th to (2) M -1 gray scale value, controlling the PWM width increase rate to be 2T to generate corresponding b+1-2 M -brightness of 1-level gray scale values.
As shown in a curve CV3 of fig. 1, the first driving current Igain1 and the first driving current GCLK1 are used for the 1 st to a-th gradation values, and the PWM width increasing rate is controlled to be 1T. For the a+1 to b-th gray scale values, the second driving current Igain2 and the second driving current GCLK2 are adopted, and the PWM width increasing rate is controlled to be 1T. For the (b+1) th to (2) M -1-level gray scale value, using the second driving current Igain2, the second driving current GCLK2, and controlling the PWM width increasing rate to be 2T.
Please refer to the following table two, which illustrates a gray-scale value with a bit number of 13 and the corresponding brightness control. In the examples of Table II below, M is 13, a is 255, b is 7947, and n is 12.
Watch II
The 255 th gray scale value is used as a boundary, the first driving current Igain1 and the first driving current GCLK1 are used for generating the brightness corresponding to the 1 st to 255 th gray scale values, and the second driving current Igain2 and the second driving frequency GCLK2 are used for generating the brightness corresponding to the 256 st to 8191 st gray scale values.
In addition, the PWM width of the luminance corresponding to the 256 th gray-scale value is controlled to be 12T, so that the luminance corresponding to the 256 th gray-scale value is substantially equal to and slightly higher than the luminance corresponding to the 255 th gray-scale value.
The PWM width increasing rate is controlled to be 1T for the 1 st to 7947 th gradation values with the 7947 th gradation value as a boundary, so as to generate luminances corresponding to the 1 st to 7947 th gradation values. For the 7948 th to 8191 th gradation values, the PWM width increasing rate is controlled to be 2T to generate luminance corresponding to the 7948 th to 8191 th gradation values.
Referring to fig. 2, a light emitting diode display panel 100 according to an embodiment is shown. The led display panel 100 includes a source driving circuit (source driver circuit) 110, a scan driving circuit (scan driver circuit) 120, and a plurality of leds 130. The source driving circuit 110 is connected to the light emitting diode 130 to provide driving signals S1 to the output terminals OUT1 to OUTm. The scan driving circuit 120 is connected to the light emitting diode 130 to provide a scan signal S2. The light emitting diodes 130 may be driven column by column L1, L2, L3, … by control of the scan signal S2.
Referring to fig. 3, a block diagram of a source driving circuit 110 according to an embodiment is shown. The source driving circuit 110 includes a current switching circuit 111, a frequency switching circuit 112, a control circuit 113, a Shift Register 114, a Register 115, a scrambling circuit (Scrambler) 116, an Output Buffer (Output Buffer) 117, a Regulator (Regulator) 118, and a Bit count control circuit (Bit-count Controller) 119.
The current switching circuit 111 is connected to the control circuit 113. The current switching circuit 111 includes a first current generator 1111, a second current generator 1112, and a multiplexer 1113. The input terminal of the multiplexer 1113 is connected to the first current generator 1111 and the second current generator 1112, and the output terminal of the multiplexer 1113 is connected to the adjusting circuit 118. The first current generator 1111 is configured to generate a first driving current Igain1, and the second current generator 1112 is configured to generate a second driving current Igain2.
The frequency switching circuit 112 is connected to the control circuit 113. The frequency switching circuit 112 includes a first frequency generator 1121, a second frequency generator 1122, and a multiplexer 1123. The input end of the multiplexer 1123 is connected to the first frequency generator 1121 and the second frequency generator 1122, and the output end of the multiplexer 1123 is connected to the bit count control circuit 119. The first frequency generator 1121 is used for generating a first driving frequency GCLK1, and the second frequency generator 1122 is used for generating a second driving frequency GCLK2.
After receiving the values a and n, the control circuit 113 calculates a value b (shown in fig. 1) based on the values a and n. For example, the control circuit 113 may perform calculation according to the following formula (1):
b＝2 M -1-(a+1)+n…………………………………………………(1)
after the control circuit 113 obtains the values a, b, and n, the first control signal CS1 and the second control signal CS2 can be output according to the gray scale levels.
The multiplexer 1113 selectively outputs the first driving current Igain1 or the second driving current Igain2 according to the first control signal CS1 output from the control circuit 113.
The multiplexer 1123 selectively outputs the first driving frequency GCLK1 or the second driving frequency GCLK2 according to the second control signal CS2 output from the control circuit 113.
Referring to fig. 4, a diagram illustrating a relationship between the driving signal S1 and the scanning signal S2 according to an embodiment is shown. The scanning signal S2 turns on the light emitting diodes of each column in sequence. During the switching process, there is a period of non-display time Ts. The current switching circuit 111 switches the first driving current Igain1 and the second driving current Igain2 at the non-display time Ts. The frequency switching circuit 112 switches the first driving frequency GCLK1 and the second driving frequency GCLK2 at the non-display time Ts.
Referring to fig. 5, a flowchart of a control method of the light emitting diode display panel 100 according to an embodiment is shown. The following steps are described with reference to the block diagram of fig. 3. In step S110, the control circuit 113 obtains a value a and a value n, and calculates a value b according to the value a and the value n.
Next, in step S120, the control circuit 113 receives a display signal, where the display signal is to represent an x-th gray scale value.
Then, in step S130, the control circuit 113 determines whether the value x is less than or equal to the value a. If the value x is less than or equal to the value a, go to step S140; if the value x is greater than the value a, the process proceeds to step S150.
In step S140, the control circuit 113 controls the current switching circuit 111 to switch to the first driving current Igain1 by the first control signal CS1, and controls the frequency switching circuit 112 to switch to the first driving frequency GCLK1 by the second control signal CS2.
In step S150, the control circuit 113 controls the current switching circuit 111 to switch to the second driving current Igain2 by the first control signal CS1, and controls the frequency switching circuit 112 to switch to the second driving frequency GCLK2 by the second control signal CS2.
After step S140, the flow advances to step S160. In step S160, the control circuit 113 controls the PWM width of the luminance corresponding to the x-th gradation value to be xT. For example, referring to table one, the PWM width of the brightness of the 1 st gray level value is 1T; the PWM width of the luminance of the 2 nd gradation value is 2T; the PWM width of the luminance of the 253 th gradation value is 253T; the PWM width of the luminance of the 254 th gradation value is 254T; the PWM width of the luminance of the 255 th gradation value is 255T.
In step S170, the control circuit 113 determines whether the value x is less than or equal to the value b. If the value x is less than or equal to the value b, go to step S180; if the value x is greater than the value b, the process proceeds to step S190.
In step S180, the control circuit 113 controls the PWM width of the luminance corresponding to the x-th gradation value to [ x- (a+1) +n ] T. For example, the PWM width of the luminance of the 256 th gradation value is 12T ([ 256- (255+1) +12] T); the PWM width of the luminance of the 257 th gradation value is 13T ([ 257- (255+1) +12] T); the PWM width of the luminance of the 258 th gradation value is 14T ([ 258- (255+1) +12] T); the PWM width of the luminance of the 7945 th gradation value is 7701T ([ 7945- (255+1) +12] T); the PWM width of the luminance of the 7946 th gradation value is 7702T ([ 7945- (255+1) +12] T); the PWM width of the luminance of the 7947 th gradation value is 7703T ([ 7945- (255+1) +12] T).
In step S190, the control circuit 113 controls the PWM width of the luminance corresponding to the x-th gradation value to be [ x- (a+1) +n+ (x-b) ] T. For example, the PWM width of the luminance corresponding to the 7948 th gradation value is 7705 ([ 7648- (255+1) +12+ (7948-7947) ] T); the PWM width of the luminance corresponding to the 7949 th gradation value is 7707 ([ 7649- (255+1) +12+ (7949-7947) ] T); the PWM width of the luminance corresponding to the 8189 th gradation value is 8187 ([ 8189- (255+1) +12+ (8189-7947) ] T); the PWM width of the luminance corresponding to the 8190 th gradation value is 8189 ([ 8190- (255+1) +12+ (8190-7947) ] T); the PWM width of the luminance corresponding to the 8191 st gradation value is 8191 ([ 8191- (255+1) +12+ (8191-7947) ] T).
According to the control method of the light emitting diode display panel 100, the technology reduces the brightness of the 1 st to a-th gray scale values so that the brightness corresponding to the 1 st to a-th gray scale values is reduced, thereby improving the discrimination degree of the 1 st to a-th gray scale values. And further connects the luminance corresponding to the a+1th gray-scale value with the luminance corresponding to the a-th gray-scale value. In addition, the high gray scale value from the b-th gray scale value can be complemented with the proper brightness.
Referring to FIG. 6, a comparison graph of three Gamma 2.2 curves is shown. The curve CV11 is a standard Gamma 2.2 curve, the curve CV12 is a Gamma 2.2 curve in which the control method of the present technology is not performed, and the curve CV13 is a Gamma 2.2 curve in which the control method of the present technology is performed. As can be seen from the enlarged view of the low gray scale, the curve CV12 has no discrimination, while the curve CV13 has significantly improved discrimination and is closer to the curve CV11. As can be seen from the enlarged view of the high gray scale, the curve CV13 still has a significant degree of discrimination and is close to the curve CV11.
Referring to FIG. 7, a graph of Gamma value distribution of the curves CV12 and CV13 according to FIG. 6 is shown. Curve CV22 represents the Gamma value of curve CV12, and curve CV23 represents the Gamma value of curve CV 13. As is evident from fig. 7, the Gamma value of curve CV23 is closer to 2.2 than curve CV 22.
That is, the led display panel 100 can perfectly display the Gamma 2.2 level by the technology of the above embodiment.
In summary, although the disclosure has been disclosed in terms of embodiments, it is not intended to limit the disclosure. Those skilled in the art to which the present disclosure pertains will appreciate that numerous variations and modifications can be made without departing from the spirit and scope of the disclosure. Accordingly, the scope of the present disclosure is defined by the claims.
Claims (12)
1. A control method for a light emitting diode display panel having 2 M The control method comprises the following steps of:
generating brightness corresponding to 1 st to a-th gray scale values by a first driving current and a first driving frequency;
generating a second driving current and a second driving frequency corresponding to the (a+1) -2 th driving voltage M -a luminance of 1-gradation value, wherein the first driving current is smaller than the second driving current or the first driving frequency is higher than the second driving frequency;
controlling the PWM width increasing rate to be T so as to generate brightness corresponding to 1 st-b th gray scale values, wherein b is greater than a; and
controlling the PWM width increase rate to be 2T to generate the PWM voltage corresponding to the b+1nd to 2 th M -brightness of 1-level gray scale values.
2. The method of claim 1, wherein the first driving current and the second driving current, the first driving frequency and the second driving frequency are switched in a non-display time.
3. The method of claim 1, wherein the PWM width of the luminance corresponding to the a+1th gray-scale value is nT, n is a numerical value, and the luminance corresponding to the a+1th gray-scale value is substantially equal to the luminance corresponding to the a-th gray-scale value.
4. The control method of a light emitting diode display panel according to claim 1, wherein b=2 M -1-(a+1)+n。
5. The method of claim 1, wherein when x is between a+1 and b, the PWM width of the luminance corresponding to the x-th gray level is [ x- (a+1) +n ] T.
6. The method of claim 1, wherein when x is between b+1 and 2 M -1, the PWM width of the luminance corresponding to the x-th gray-scale value is [ x- (a+1) +n+ (x-b)]T。
7. A light emitting diode display panel has 2 nd M The light emitting diode display panel includes:
a source driver circuit, comprising:
a current switching circuit for switching between a first driving current and a second driving current;
a frequency switching circuit for switching between a first driving frequency and a second driving frequency; a kind of electronic device with high-pressure air-conditioning system
A control circuit connected to the current switching circuit and the frequency switching circuit for controlling the current switching circuit and the frequency switching circuit to generate brightness corresponding to 1 st to a-th gray scale values with the first driving current and the first driving frequency, and to generate brightness corresponding to a+1-2 th gray scale values with the second driving current and the second driving frequency M -brightness of 1-level gray scale values;
wherein the first driving current is smaller than the second driving current or the first driving frequency is higher than the second driving frequency;
wherein the control circuit is further used for controlling the PWM width increasing rate to be T so as to generate brightness corresponding to the 1 st to the b th gray scale values, and controlling the PWM width increasing rate to be 2T so as to generate brightness corresponding to the b+1 st to the 2 nd gray scale values M -brightness of 1-level gray scale values.
8. The LED display panel of claim 7, wherein the current switching circuit switches the first driving current and the second driving current at a non-display time, and the frequency switching circuit switches the first driving frequency and the second driving frequency at the non-display time.
9. The LED display panel of claim 7, wherein the control circuit controls the PWM width of the luminance corresponding to the a+1th gray-scale value to be nT, n to be a value, and the luminance corresponding to the a+1th gray-scale value is substantially equal to the luminance corresponding to the a-th gray-scale value.
10. The led display panel of claim 7, wherein b = 2 M -1-(a+1)+n。
11. The LED display panel of claim 7, wherein when x is between a+1 and b, the control circuit controls the PWM width of the brightness corresponding to the x-th gray-scale value to be [ x- (a+1) +n ] T.
12. The light emitting diode display panel of claim 7, wherein when x is between b+1 and 2 M -1, the control circuit controlling the PWM width of the luminance corresponding to the x-th gray-scale value to be [ x- (a+1) +n+ (x-b)]T。
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| TW111100551A TWI807573B (en) | 2022-01-06 | 2022-01-06 | Light-emitting diode display panel and control method thereof |
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| CN114708830B true CN114708830B (en) | 2023-10-20 |
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| TW202329070A (en) | 2023-07-16 |
| CN114708830A (en) | 2022-07-05 |
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