TWI732268B - Signal processing method and display device - Google Patents

Abstract

A signal processing method includes: capturing a timing control signal by a signal capture circuit; receiving a plurality of pixel data signals and calculating a plurality of backlight data signals according to the pixel data signals by a calculation circuit; outputting a plurality of corresponding backlight control signals according to the timing control signal and the backlight data signals by a backlight control circuit; and emitting light according to the backlight control signals by a backlight element.

Description

Signal processing method and display device

The present disclosure relates to a signal processing method and display device, and in particular to a signal processing method and display device for adjusting backlight brightness.

With the development of technology, the demand for display devices has become more and more extensive. Since the brightness of the liquid-crystal display (LCD) is limited by the structure of the liquid crystal molecule material, part of the light is still transmitted through the liquid-crystal display when the screen is black, and the contrast of the display cannot be improved.

Therefore, how to effectively improve the contrast of the liquid crystal display is a design consideration and challenge at present.

An implementation aspect of the present disclosure relates to a signal processing method, including: capturing a timing control signal by a signal capturing circuit; receiving a plurality of pixel data signals by a calculation circuit and calculating a plurality of backlight data signals based on the pixel data signals ; The backlight control circuit outputs corresponding plural backlight control signals according to the timing control signal and the backlight data signal; and the backlight element emits light according to the backlight control signal.

Another embodiment of the present disclosure relates to a display device including a backlight element and a processor. The backlight element includes a plurality of backlight regions. The backlight area corresponds to a plurality of pixels, respectively. The processor is coupled to the backlight element. The processor includes a signal capture circuit, a calculation circuit, and a backlight control circuit. The signal capture circuit is used to capture the timing control signal. The calculation circuit receives a plurality of pixel data signals corresponding to the pixels, and calculates a plurality of backlight data signals corresponding to the backlight area according to the pixel data signals. The backlight control circuit is used for outputting a plurality of backlight control signals corresponding to the backlight area according to the timing control signal and the backlight data signal, so that the backlight area of the backlight element emits light according to the backlight control signal.

The following is a detailed description of the embodiments in conjunction with the accompanying drawings. However, the specific embodiments described are only used to explain the case, and are not used to limit the case. The description of the structural operations is not used to limit the order of its execution. The recombined structures and the devices with equal effects are all within the scope of this disclosure.

Unless otherwise specified, the terms used in the entire specification and the scope of the patent application usually have the usual meaning of each term used in this field, in the content disclosed here, and in the special content.

Regarding the "first", "second", "third"... etc. used in this article, it does not specifically refer to the order or sequence, nor is it used to limit the present disclosure. It is only used to distinguish between the same technical terms. The components or operations only.

In addition, the "coupling" or "connection" used in this text can refer to two or more components directly making physical or electrical contact with each other, or indirectly making physical or electrical contact with each other, and can also refer to two or more components. Multiple elements interoperate or act.

Please refer to Figure 1. FIG. 1 is a schematic diagram of a display device 100 according to some embodiments of the present disclosure. As shown in FIG. 1, the display device 100 includes a processor 120, a liquid crystal element 140, a backlight element 160, and a memory 180. Structurally, the processor 120 is coupled to the liquid crystal element 140, the backlight element 160 and the memory 180. In operation, the liquid crystal element 140 is used to display and output images. The backlight element 160 is used to output backlight. The processor 120 is used to receive the input image signal, and obtain the liquid crystal control signal and the backlight control signal CS through the signal processing method to output to the liquid crystal element 140 and the backlight element 160 for control respectively. The memory 180 is used to store various data and signals.

Specifically, please refer to Figures 2 and 3. FIG. 2 is a schematic diagram of a backlight element 160 according to some embodiments of the present disclosure. FIG. 3 is a schematic diagram showing a backlight zone Z11 according to some embodiments of the present disclosure. As shown in FIG. 2, the backlight element 160 includes a plurality of backlight regions Z11 to Zij. Each backlight area corresponds to a plurality of pixels. As shown in FIG. 3, the backlight area Z11 corresponds to the pixels P11 to Pij. In other words, the display device 100 includes m*n*i*j pixels in total. Among them, m, n, i, and j are all positive integers, and m is greater than or equal to i, and n is greater than or equal to j. For example, the display device 100 includes 1800*1200 pixels, and the backlight element 160 includes 24*16 areas, and each backlight area includes 75*75 pixels. It is worth noting that the above values are only examples for convenience of explanation, and are not intended to limit the case.

In addition, in some embodiments, as shown in FIG. 3, in each frame of input image data DIN, each pixel corresponds to a pixel data signal including three color data. For example, the pixel data signal corresponding to the pixel P11 includes red color data R11, green color data G11, and blue color data B11. The pixel data signal corresponding to pixel P12 includes red color data R12, green color data G12, and blue color data B12. By analogy, the pixel data signal corresponding to the pixel Pij includes red color data Rij, green color data Gij, and blue color data Bij.

In some embodiments, the display device 100 may be various devices including a liquid crystal panel, such as a mobile phone, a tablet, a notebook computer, a handheld device, a desktop display device, a virtual reality (Virtual Reality) device, and so on. In addition, in some embodiments, the processor 120 can be implemented by various processing circuits, micro controllers, central processing units, microprocessors, digital signal processors (DSPs), and special application products. Implementation of various methods such as application specific integrated circuit (ASIC), complex programmable logic device (CPLD), field-programmable gate array (FPGA) or logic circuit.

Please refer to Figure 4. FIG. 4 is a schematic diagram of a processor 120 according to some embodiments of the present disclosure. As shown in FIG. 4, the processor 120 includes a signal extraction circuit 122, a calculation circuit 124, and a backlight control circuit 126. The signal extraction circuit 122 is used for receiving the start signal STV or the synchronous clock signal SYNC to extract the timing control signal. The calculation circuit 124 receives the input image signal DIN and calculates the backlight data signal according to the input image signal DIN. The backlight control circuit 126 is used to receive the timing control signal and the backlight data signal, and output a corresponding backlight control signal CS according to the timing control signal and the backlight data signal.

Specifically, please refer to FIG. 5 for the signal processing method 500. FIG. 5 is a flowchart of a signal processing method 500 according to some embodiments of the present disclosure. The following signal processing method 500 is described in conjunction with the embodiments shown in Figures 1 to 7, but not limited to this. Anyone who is familiar with this technique can perform various operations without departing from the spirit and scope of the case. Change and retouch. As shown in FIG. 5, the signal processing method 500 includes operations S520, S540, S560, and S580.

In operation S520, the timing control signal is captured by the signal capture circuit 122. Specifically, the signal extraction circuit 122 receives the start signal STV, the synchronous clock signal SYNC, or other signals that control the time point of the operation of the display device 100, and extracts the timing control signal therefrom. For example, the signal capture circuit 122 can capture the horizontal or vertical synchronization clock signal of the display device 100.

In operation S540, the calculation circuit 124 receives the pixel data signal and calculates the backlight data signal according to the pixel data signal. Specifically, the calculation circuit 124 receives the input image signal DIN. The input image signal DIN includes pixel data signals corresponding to a plurality of pixels (for example, the color data R11, G11, and B11 included in the pixel P11 in the second figure). The calculation circuit 124 calculates the backlight data signals corresponding to the plurality of backlight regions according to the pixel data signals.

Furthermore, the calculation circuit 124 is used to determine the largest pixel data signal corresponding to one of the backlight regions, and calculate the backlight data signal corresponding to the backlight region according to the largest pixel data signal.

For example, in some embodiments, as shown in FIG. 5, the backlight area Z11 includes pixels P11 to Pij, and each of the pixels P11 to Pij includes three color data of red, green, and blue. One color data of each pixel data signal can be 0～255. For example, (R11, G11, B11) contained in the pixel P11 may be (10,189,250). In other words, the pixel data signal corresponding to the backlight zone Z11 includes R11-Rij, G11-Gij, and B11-Bij. Therefore, the calculation circuit 124 determines the largest of the pixel data signals R11 to Rij, G11 to Gij, and B11 to Bij to calculate the backlight data signal corresponding to the backlight zone Z11.

Specifically, the calculation circuit 124 is used for dividing the largest of the pixel data signals by the maximum value of the pixel data signals as the pulse width modulation (PWM) value of the backlight data signal. Please refer to Figure 6. FIG. 6 is a schematic diagram illustrating the conversion of a signal processing method 500 according to some embodiments of the present disclosure. As shown in FIG. 6, when the curve 610 is the unadjusted backlight data signal, the corresponding pulse width modulation value is 100% no matter which of the data signal is from 0 to 255. Therefore, when the data signal is a black screen, the backlight element still emits light and is blocked by the liquid crystal element. In this embodiment, it can be seen from the curve 620 that the data signal and the pulse width modulation value are positively correlated. In other words, when the brightness represented by the data signal is low, the backlight emitted by the backlight element 160 is also dim. In other words, when the backlight element 160 corresponds to a low-brightness image of the data signal, it emits light with low brightness or no light to improve the contrast of the display.

For example, in some embodiments, if the largest of the pixel data signals R11~Rij, G11~Gij, B11~Bij corresponding to the backlight zone Z11 is 250, then the calculation circuit 124 calculates that 250/255= 98% is used as the pulse width modulation value of the backlight data signal corresponding to the backlight zone Z11. For another example, if the largest of the pixel data signals R11~Rij, G11~Gij, B11~Bij corresponding to the backlight zone Z11 is 18, the calculation circuit 124 calculates 18/255=8% as the corresponding backlight zone The pulse width modulation value of the Z11 backlight data signal.

Then, in operation S560, the backlight control circuit 126 outputs the corresponding backlight control signal CS according to the timing control signal and the backlight data signal. Specifically, the backlight control circuit 126 generates the backlight control signal CS according to the backlight data signal, and controls the time point at which the backlight control signal CS is output according to the timing control signal. For example, if the pulse width modulation value of the backlight data signal is 50%, the backlight control circuit 126 outputs the backlight control signal CS with the pulse width modulation value of 50% to drive the backlight element 160. In addition, the backlight control signal CS output to the backlight element 160 is matched with the operating energy of the liquid crystal element 140 according to the timing control signal. For example, according to the timing control signal, the backlight control signal CS is output to the backlight element 160 after the liquid crystal element 140 starts to rotate to the position.

Finally, in operation S580, the backlight element 160 emits light according to the backlight control signal CS. Specifically, the backlight element 160 receives the backlight control signal CS from the backlight control circuit 126 and emits light according to the backlight control signal CS. In addition, the liquid crystal element 140 receives the liquid crystal control signal corresponding to the pixel from the processor 120 and performs display according to the liquid crystal control signal.

In this way, the signal processing method 500 can generate the backlight control signal CS with corresponding brightness according to the input image data of the current frame according to the display content of each display area, so as to improve the display detail and contrast.

Please refer to Figure 7. FIG. 7 shows a test result diagram of a signal processing method 500 according to some embodiments of the present disclosure. As shown in FIG. 7, the curve 710 represents the corresponding relationship between the unadjusted data signal and the pulse width modulation value. The curve 720 represents the corresponding relationship between the data signal adjusted by the signal processing method 500 and the pulse width modulation value.

It should be noted that the execution sequence of the processes in the foregoing flowcharts is only an exemplary embodiment, and does not limit the actual implementation of the present invention. Anyone with ordinary knowledge in the technical field can make various changes and modifications without departing from the spirit and scope of this case. For example, in some embodiments, the sequence of operations S520 and S540 in the signal processing method 500 can be changed or can be performed simultaneously.

In addition, although the disclosed methods are shown and described herein as a series of steps or events, it should be understood that the order of these steps or events shown should not be construed in a limiting sense. For example, some steps may occur in a different order and/or simultaneously with other steps or events other than the steps or events shown and/or described herein. In addition, when implementing one or more aspects or embodiments described herein, not all the steps shown here are necessary. In addition, one or more steps in this document may also be executed in one or more separate steps and/or stages.

It should be noted that, in the case of no conflict, the features and circuits in the various drawings, embodiments, and embodiments of the present disclosure can be combined with each other. The circuit shown in the drawing is only an example, and is simplified to make the description concise and easy to understand, and is not intended to limit the case. In addition, the various devices, units, and components in the foregoing embodiments can be implemented by various types of digital or analog circuits, and can also be implemented by different integrated circuit chips, or integrated into a single chip. The foregoing is only an example, and the present disclosure is not limited thereto.

To sum up, in this case, by applying the above-mentioned various embodiments, the signal processing method 500 generates the corresponding backlight control signal CS according to the brightness of the input image signal DIN (including multiple pixel data signals) to correspond to the display screen Adjust the pulse width modulation value of the backlight in the different bright and dark areas, so that the high-brightness picture is not affected and the low-brightness picture is opaque to improve the contrast.

Although the content of this disclosure has been disclosed in the above manner, it is not intended to limit the content of this disclosure. Those with ordinary knowledge in the technical field can make various changes and modifications without departing from the spirit and scope of this disclosure. Therefore, this The scope of protection of the disclosed content shall be subject to the scope of the attached patent application.

100: display device 120: processor 122: signal capture circuit 124: calculation circuit 126: Backlight control circuit 140: liquid crystal element 160: Backlight element 180: memory 500: Signal processing method S520, S540, S560, S580: operation Z11～Zij: Backlight area P11～Pmn: pixel R11～Rmn, G11～Gmn, B11～Bmn: pixel data signal STV: Start signal SYNC: Synchronous clock signal DIN: Input video signal CS: Backlight control signal 610, 620, 710, 720: Curve

FIG. 1 is a schematic diagram of a display device according to some embodiments of the present disclosure. FIG. 2 is a schematic diagram of a backlight element according to some embodiments of the present disclosure. FIG. 3 is a schematic diagram showing a backlight area according to some embodiments of the present disclosure. FIG. 4 is a schematic diagram of a processor according to some embodiments of the present disclosure. FIG. 5 is a flowchart of a signal processing method according to some embodiments of the present disclosure. FIG. 6 is a schematic diagram of conversion of a signal processing method according to some embodiments of the present disclosure. FIG. 7 shows a test result diagram of a signal processing method according to some embodiments of the present disclosure.

500: Signal processing method

S520, S540, S560, S580: operation

Claims (6)

A signal processing method includes: capturing a timing control signal by a signal capturing circuit; receiving a plurality of pixel data signals by a calculation circuit and calculating a plurality of backlight data signals according to the pixel data signals; controlled by a backlight The circuit outputs corresponding backlight control signals according to the timing control signal and the backlight data signals; and a backlight element emits light according to the backlight control signals; wherein one of the backlight data signals corresponds to the backlight element One of the plurality of backlight regions in the backlight regions, each of the backlight regions corresponds to a plurality of pixels, one of the pixels corresponds to one of the pixel data signals, wherein the calculation The backlight data signal further includes the calculation circuit determining the largest of the pixel data signals corresponding to one of the backlight regions, and the calculation circuit calculates the corresponding pixel data signal according to the largest of the pixel data signals The backlight data signal of the one in the backlight areas. The signal processing method according to claim 1, wherein calculating the backlight data signals further includes: dividing the largest of the pixel data signals by the maximum value of a pixel data signal by the calculation circuit as the backlight data signal A pulse width modulation value of. The signal processing method described in claim 1, wherein the output The backlight control signals further include: the backlight control circuit generates the backlight control signals according to the backlight data signals; and the backlight control circuit controls the timing of outputting the backlight control signals according to the timing control signal. A display device includes: a backlight element, including a plurality of backlight regions, the backlight regions respectively corresponding to a plurality of pixels; and a processor, coupled to the backlight element, including: a signal capture circuit for capturing A timing control signal; a calculation circuit for receiving a plurality of pixel data signals corresponding to the pixels, and calculating a plurality of backlight data signals corresponding to the backlight areas according to the pixel data signals; and The backlight control circuit is used to output a plurality of backlight control signals corresponding to the backlight regions according to the timing control signal and the backlight data signals, so that the backlight regions of the backlight element emit light according to the backlight control signals, wherein The calculation circuit is used to determine the largest of the pixel data signals corresponding to one of the backlight areas, and calculate the largest one of the pixel data signals corresponding to the backlight areas The backlight data signal of the person. The display device according to claim 4, wherein the computing circuit The method is used to divide the largest of the pixel data signals by the maximum value of a pixel data signal as a pulse width modulation value of the backlight data signal. The display device according to claim 4, further comprising: a liquid crystal element for receiving a plurality of liquid crystal control signals corresponding to the pixels, and displaying according to the liquid crystal control signals.

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