CN107784981B - Device applied to display and related image display method - Google Patents

Abstract

The present invention relates to a device applied to a display, comprising a receiving circuit, a detection circuit, an image processing circuit and a response time acceleration circuit, wherein the receiving circuit is used to receive an input image signal; the detection circuit detects a frame update rate of image data of a frame in the input image signal; the image processing circuit performs image processing on the image data of the frame to generate target pixel values of multiple pixels of the frame; and the response time acceleration circuit determines multiple adjusted pixel values of the multiple pixels according to the frame update rate, and outputs the multiple adjusted pixel values to a display panel; wherein for a specific pixel, the adjusted pixel value of the specific pixel generated at different frame update rates is different.

Description

Apparatus applied to display and related image display method

technical field

The present invention relates to a display, in particular to a response time acceleration method applied to a liquid crystal display.

Background technique

In the current liquid crystal display panel, a response time enhancement method is usually adopted to speed up the response time of the liquid crystal, so as to avoid the afterimage phenomenon and enable the image to be displayed more clearly. For example, if the pixel value (gray value) of the pixel needs to be changed from 10 to 200, the driver circuit of the display may first set the pixel value of the pixel to 230 to use a higher voltage difference to speed up the driving of the liquid crystal. Steer, then switch back to 200 so that the pixels are displayed with the correct pixel value. However, since the above-mentioned pixel value 230 is not the brightness that the pixel really needs to display, it may cause some side effects on the image display.

In addition, there are currently some technologies for dynamically changing the frame rate. The frame update rate will vary according to the content of the image data to make the picture smooth. However, if the same response time acceleration strength is used under different frame update rates, It is possible to make the above-mentioned side effects of image display more serious.

SUMMARY OF THE INVENTION

Therefore, one of the objectives of the present invention is to provide a response time acceleration method, which can adopt different response time acceleration strengths under different frame update rates, so as to solve the problems in the prior art.

In one embodiment of the present invention, an apparatus applied to a display includes a receiving circuit, a detection circuit, an image processing circuit and a response time acceleration circuit, wherein the receiving circuit is used for receiving an input image signal; the The detection circuit detects a frame update rate of the image data of a frame in the input image signal; the image processing circuit is coupled to the detection circuit and is used for performing image processing on the image data of the frame to generate a plurality of frames of the frame a plurality of target pixel values of a pixel; and the response time acceleration circuit is coupled to the detection circuit, and is used for determining a plurality of adjusted pixel values of the plurality of pixels according to the frame update rate, and adjusting the plurality of adjusted pixel values The pixel value is output to a display panel; for a specific pixel in the plurality of pixels, the adjusted pixel value of the specific pixel generated by the response time acceleration circuit will be different under different frame update rates.

In another embodiment of the present invention, an image display method applied to a display includes: receiving an input image signal; detecting a frame update rate of image data of a frame in the input image signal; performing image processing on the image data of a frame to generate a plurality of target pixel values of a plurality of pixels of the frame; and determining a plurality of adjusted pixel values of the plurality of pixels according to the frame update rate, and converting the plurality of adjusted pixels The value is output to a display panel; for a specific pixel in the plurality of pixels, the adjusted pixel value of the specific pixel will be different under different frame update rates.

Description of drawings

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the operation of the response time acceleration circuit according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of the operation of a reaction time acceleration circuit according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of the operation of a reaction time acceleration circuit according to another embodiment of the present invention.

FIG. 5 is a flowchart of an image display method applied to a display according to an embodiment of the present invention.

The component numbers in the figure are as follows:

100 devices

110 Receiver circuit

120 decoder

122 Detection circuit

130 image processing circuit

140 Reaction time acceleration circuit

150 storage units

152_1～152_N Lookup table

160 output circuit

500～510 steps

Detailed ways

Please refer to FIG. 1 , which is a schematic diagram of an apparatus 100 according to an embodiment of the present invention. As shown in FIG. 1 , the device 100 includes a receiving circuit 110 , a decoder 120 , an image processing circuit 130 , a response time acceleration circuit 140 , a storage unit 150 and an output circuit 160 , wherein the decoder 120 includes a The detection circuit 122 and the storage unit 150 store look-up tables 152_1 to 152_N. In this embodiment, the device 100 is applied to a display, such as a TV with a liquid crystal panel, and is used to receive and process an input image signal Din from an external device to generate an output image data Dout to A display panel of the TV is used for display, wherein the external device can be a video player or a display card in a computer.

The device 100 in this embodiment is especially applied to the situation where the frame update rate of the input video signal Din changes dynamically, that is, the frame update rate of the input video signal Din from the external device varies with the video content. For example, when the content of a plurality of consecutive frames in the input image signal Din changes little (for example, close to a still image), the input image signal Din will have a lower frame update rate; on the contrary, when the input image signal Din has a lower frame update rate When the contents of a plurality of consecutive frames in Din vary greatly, the input video signal Din will have a higher frame update rate. In addition, the device 100 in this embodiment can dynamically adjust the output pixel value according to the frame update rate of the input image signal Din, so that the liquid crystals corresponding to the pixels in the display panel can have different response time acceleration strengths. The specific operation details are as follows.

In the operation of the apparatus 100, first, the receiving circuit 110 receives the input video signal Din, and the decoder 120 decodes the input video signal Din to obtain a frame of video data, and the detection circuit 122 detects the frame update rate of the frame. Next, the image processing circuit 130 receives the image data of the frame from the decoder 120, and performs zoom-in/reduction, color, and brightness processing on the image data of the frame to generate target pixel values of a plurality of pixels of the frame. Next, the response time acceleration circuit 140 selects a specific look-up table from the plurality of look-up tables 152_1-152_N in the storage unit 150 according to the frame update rate of the frame provided by the decoder 120/detection circuit 122, and according to the The target pixel values of the plurality of pixels of the frame and the pixel values of the plurality of pixels of a previous frame are used to determine the plurality of adjusted pixel values of the plurality of pixels from the specific look-up table. Finally, the output circuit 160 outputs the adjusted pixel values to the display panel for display.

In this embodiment, it is assumed that the frame update rate of the input image signal Din varies between 30 Hz and 120 Hz, the storage unit 150 may include nine look-up tables 152_1 to 152_9, wherein the look-up table 152_1 corresponds to the frame update rate of 30 Hz to 40 Hz. , the look-up table 152_2 corresponds to the frame update rate 40Hz-50Hz, the look-up table 152_3 corresponds to the frame update rate 50Hz-60Hz, and so on. The response time acceleration circuit 140 selects the corresponding look-up table according to the frame update rate of the frame provided by the decoder 120/detection circuit 122. For example, when the frame update rate of the frame is 30 Hz, the look-up table 152_1 is selected as the The specific look-up table, and when the frame update rate of the frame is 60 Hz, the look-up table 152_4 is selected as the specific look-up table. In addition, in this embodiment, when the frame update rate of the frame is lower, the response time acceleration circuit 140 performs the response time acceleration according to the specific look-up table weaker, that is, the adjustment generated by the response time acceleration circuit 140 is weaker. The latter pixel value will be closer to the actual pixel value to be displayed (ie, the target pixel value to be output by the image processing circuit 130 ). In another embodiment of the present invention, the storage unit 150 does not need to include a plurality of look-up tables, but only needs to include a look-up table corresponding to a basic frame update rate. Only the look-up table 152_4 is stored in the unit 150. If the frame update rate of the frame is lower than 60 Hz, the response time acceleration circuit 140 will multiply the response time acceleration intensity found in the look-up table 152_4 by a gain less than 1. When the frame update rate of the frame is lower, the gain value is lower. On the contrary, if the frame update rate of the frame is higher than 60Hz, the response time acceleration circuit 140 will multiply the response time acceleration strength found in the lookup table 152_4 by A gain greater than 1, the higher the gain value when the frame update rate for that frame is higher.

For example, please refer to FIG. 2 , which is a schematic diagram of the operation of the response time acceleration circuit 140 according to an embodiment of the present invention. In FIG. 2 , the frame update rate of the input image signal Din is 60 Hz. For a specific pixel, it is assumed that the pixel value of the specific pixel in the previous frame is “10”, and the specific pixel is in the current frame and the next frame. If the pixel value is "200", in order to speed up the response time of the liquid crystal, the response time acceleration circuit 140 will determine an adjusted pixel value "230" according to the lookup table 152_4, and the output circuit 160 will determine the adjusted pixel value "230" ” is sent to the display panel for display. Then, in the next frame, the pixel value of the specific pixel output by the output circuit 160 returns to "200".

The slashed portion shown in Figure 2 is not the brightness that the pixel really needs to display, so it can be regarded as a reference index of side effects on image display. The larger the area, the greater the side effects on image display.

Next, please refer to FIG. 3 , which is a schematic diagram of the operation of the response time acceleration circuit 140 according to another embodiment of the present invention. In FIG. 3 , the frame update rate of the input image signal Din is 30 Hz. For a specific pixel, it is assumed that the pixel value of the specific pixel in the previous frame is “10”, and the specific pixel is in the current frame and the next frame. is “200”, in order to speed up the response time of the liquid crystal, the response time acceleration circuit 140 will determine an adjusted pixel value “210” according to the look-up table 152_1, and the output circuit 160 will determine the adjusted pixel value “210” ” is sent to the display panel for display. Then, in the next frame, the pixel value of the specific pixel output by the output circuit 160 returns to "200".

In the example of FIG. 3 , due to the low frame update rate, if the lookup table 152_4 is still used to set the adjusted pixel value as “230”, it is conceivable that the area of the oblique line will become larger, which will cause more Bad image display side effect; therefore, by using another lookup table 152_1 to determine the adjusted pixel value "210", the area of the slashed portion can be reduced, and the image display side effect will not be reduced due to the frame update rate. and increase.

FIG. 4 is a schematic diagram illustrating the operation of the reaction time acceleration circuit 140 according to another embodiment of the present invention. As shown in FIG. 4 , the frame update rate of a plurality of consecutive frames changes dynamically. When the frame update rate is high, the response time acceleration circuit 140 adopts a stronger response time acceleration degree, that is, the adjusted pixel value and the The difference between the target pixel values (actual pixel values) is relatively large; and when the frame update rate is low, the response time acceleration circuit 140 uses a weaker response time acceleration degree, that is, the adjusted pixel value and the target pixel value ( the actual pixel value) will be smaller. Through the above-mentioned technical solution of dynamically adjusting the response time acceleration degree according to the frame update rate, the displayed image can maintain the image quality better when the response time is accelerated.

Please refer to FIG. 5 , which is a flowchart of an image display method applied to a display according to an embodiment of the present invention. Referring to the content disclosed in FIGS. 1 to 4 above and the description, the flow is as follows.

Step 500: The process starts.

Step 502: Receive an input image signal.

Step 504: Decode the input video signal to obtain a frame of video data, and detect a frame update rate of the frame.

Step 506 : Perform image processing on the image data of the frame to generate pixel values of a plurality of pixels of the frame.

Step 508 : Determine a plurality of adjusted pixel values of the plurality of pixels according to the frame update rate, wherein different frame update rates will generate different adjusted pixel values.

Step 510: Send the adjusted pixel values to a display panel.

Briefly summarizing the present invention, in the device and image display method of the present invention applied to a display, the response time acceleration strength is changed according to the frame update rate, and the lower the frame update rate is, the higher the response time acceleration strength will be. Low to avoid the side effect of image display being magnified due to lower frame update rates. Through the present invention, the displayed image can keep the image quality better when the response time is accelerated.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be defined by the claims.

Claims (12)

1. A device applied to a display, comprising: a receiving circuit for receiving an input image signal; a detection circuit, coupled to the receiving circuit, for detecting a frame update rate of the image data of one frame in the input image signal; an image processing circuit, coupled to the detection circuit, for performing image processing on the image data of the frame to generate a plurality of target pixel values of a plurality of pixels of the frame; and a response time acceleration circuit, coupled to the detection circuit and the image processing circuit, for determining a plurality of adjusted pixel values of the plurality of pixels according to the frame update rate, and outputting the plurality of adjusted pixel values to a a display panel; wherein for a specific pixel in the plurality of pixels, under different frame update rates, the adjusted pixel value of the specific pixel generated by the response time acceleration circuit will be different; When the frame has a first frame update rate, the response time acceleration circuit determines that the specific pixel has a first adjusted pixel value; and when the frame has a second frame update rate lower than the first frame update rate When the frame update rate is used, the response time acceleration circuit determines that the specific pixel has a second adjusted pixel value, wherein the difference between the second adjusted pixel value and the target pixel value of the specific pixel is lower than the first pixel value The difference between the adjusted pixel value and the target pixel value. 2 . The apparatus of claim 1 , wherein when the frame update rate is lower, the adjusted pixel value of the specific pixel determined by the response time acceleration circuit is closer to the output value of the image processing circuit. 3 . the target pixel value for that particular pixel. 3. The apparatus of claim 1, further comprising: a storage unit storing a plurality of look-up tables, wherein the plurality of look-up tables correspond to different frame update rates respectively; The response time acceleration circuit selects a corresponding look-up table from the plurality of look-up tables of the storage unit according to the frame update rate, and determines from the corresponding look-up table according to the target pixel value of the specific pixel The adjusted pixel value for that particular pixel. 4 . The apparatus of claim 3 , wherein the plurality of look-up tables correspond to different frame update rate intervals respectively. 5 . 5 . The apparatus of claim 3 , wherein the response time acceleration circuit selects the corresponding pixel value from the corresponding pixel according to the target pixel value of the specific pixel of the frame and a pixel value of the specific pixel of a previous frame. 6 . The adjusted pixel value of the specific pixel is determined from the look-up table of . 6. The apparatus of claim 1, wherein the apparatus is set in a television, and The frame update rate of the input video signal received by the receiving circuit is dynamically changed. 7. An image display method applied to a display, comprising: receiving an input video signal; detecting a frame update rate of a frame of image data in the input image signal; performing image processing on the image data of the frame to generate a plurality of target pixel values for a plurality of pixels of the frame; and Determine a plurality of adjusted pixel values of the plurality of pixels according to the frame update rate, and output the plurality of adjusted pixel values to a display panel; wherein for a specific pixel in the plurality of pixels, in different frames Under the update rate, the adjusted pixel value of the specific pixel will be different; The steps of determining a plurality of adjusted pixel values of the plurality of pixels according to the frame update rate, and outputting the plurality of adjusted pixel values to the display panel include: when the frame has a first frame update rate, determining that the specific pixel has a first adjusted pixel value; and When the frame has a second frame update rate lower than the first frame update rate, determining that the specific pixel has a second adjusted pixel value; The difference between the second adjusted pixel value and the target pixel value of the specific pixel is lower than the difference between the first adjusted pixel value and the target pixel value. 8. The image display method of claim 7, wherein the step of determining the gain values of the pixels according to the update rate of the frame comprises: When the frame update rate is lower, the determined adjusted pixel value of the specific pixel is closer to the target pixel value of the specific pixel. 9. The image display method of claim 7, further comprising: providing a plurality of look-up tables, wherein the plurality of look-up tables respectively correspond to different frame update rates; and The steps of determining a plurality of adjusted pixel values of the plurality of pixels according to the frame update rate, and outputting the plurality of adjusted pixel values to the display panel include: selecting a corresponding look-up table from the plurality of look-up tables according to the frame update rate; and The adjusted pixel value of the specific pixel is determined from the corresponding look-up table according to the target pixel value of the specific pixel. 10 . The image display method of claim 9 , wherein the plurality of look-up tables correspond to different frame update rate intervals respectively. 11 . 11. The image display method of claim 9, wherein the step of determining the adjusted pixel value of the specific pixel from the corresponding look-up table according to the target pixel value of the specific pixel comprises: The adjusted pixel value of the specific pixel is determined from the corresponding look-up table according to the target pixel value of the specific pixel of the frame and a pixel value of the specific pixel of a previous frame. 12 . The image display method of claim 7 , wherein the image display method is applied to a television, and the frame update rate of the input image signal is dynamically changed. 13 .

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