TWI771746B - Adjustment method of gamma setting value, flat panel display, and information processing device - Google Patents

Abstract

The present invention discloses a method for adjusting a gamma setting value, which is applied to a flat panel display including at least one display driving chip and a flat panel display panel. In the process of performing a gamma correction procedure on the flat display panel, the gamma setting value adjustment method of the present invention generates a plurality of output gamma gray-scale values according to a plurality of input gamma gray-scale values, and makes any adjacent There is a difference between the two output gamma grayscale values. Because the present invention makes the difference value to be a power of k, the number of the output gamma gray-scale values is flexible and selectable, and the number of the output gamma gray-scale values is also easy to select. modulation.

Description

Adjustment method of gamma setting value, flat panel display, and information processing device

The present invention relates to the field of display driving technology, in particular to a method for adjusting a gamma setting value for elastically adjusting a plurality of gamma binding points in a display driving chip.

It is known that flat-panel displays include non-self-luminous flat-panel displays and self-luminous flat-panel displays. Liquid crystal displays are a non-self-luminous flat-panel display that has been used for a long time, and organic light-emitting diodes (OLEDs) ) displays and light-emitting diode (Llight-emitting diode, LED) displays are currently widely used self-luminous flat panel displays. FIG. 1 shows a block diagram of a conventional flat panel display. As shown in FIG. 1, the flat panel display 1a includes: a flat panel display panel 11a, a gate (column) driving circuit 12a, a source (row) driving circuit 13a, a display controller 14a, and a voltage conversion unit 15a .

Electronic engineers familiar with the design and manufacture of OLED displays know that the current technology often integrates the gate driver circuit 12a and the source driver circuit 13a into a single display driver chip. In addition, the source driving circuit 13a usually includes a gamma voltage generating unit 131a for converting a working voltage V _DD provided by the voltage converting unit 15a into a plurality of reference gamma voltages, so that A plurality of data display driving units in the source driving circuit 13a can generate a corresponding plurality of drivers according to a plurality of the reference gamma voltages and a sequence of data signals and a data clock signal transmitted by the display controller 14a The signal is transmitted to the flat display panel 11a.

It must be known that, if the display panel 11a is a self-luminous flat display panel, such as an OLED display panel, the basic parameters of the OLED display panels provided by different panel suppliers are bound to be different. Therefore, when assembling the flat panel display 1a, in order to enable the display driver chip to drive the (self-luminous) flat panel display panel 11a to perfectly display color images, it is necessary to perform a gamma adjustment on the flat panel display panel 11a before leaving the factory Program (Gamma tuning). Therefore, in addition to the gamma voltage generating unit 131a, the source driving circuit 13a also includes a gamma correction unit 132a, which may be a digital gamma correction circuit or an analog gamma correction circuit.

Of course, for a display driving chip that includes both the gate driver circuit 12a and the source driver circuit 13a, the gamma voltage generating unit 131a and the gamma correction unit 132a may also be independent circuit units. , not necessarily included in the source driver circuit 13a.

In more detail, in the case where the display driver chip includes a digital gamma correction circuit, the manufacturer of the display will set a plurality of (correction) in a register of the digital gamma correction circuit after completing the gamma correction procedure. The last) gamma setting value, which is called the gamma binding point in the industry, that is, a plurality of fixed gamma grayscale coordinates. It should be understood that the number of gamma bonding points set in the display driver chips of different IC manufacturers is different. For example, 27 (corrected) gamma setting values are set in the digital gamma correction circuit register. Unfortunately, since the grayscale coordinates (W0~W255) represented by the 27 gamma setting values are usually fixed, it is only suitable for the display driver chip to drive a specific display panel 11a to display perfect colors images, but not applicable to self-luminous display panels provided by different panel manufacturers.

It can be seen from the above description that there is an urgent need in the art for a new method for adjusting the gamma setting value.

The main purpose of the present invention is to provide a method for adjusting the gamma setting value, which is applied in a flat panel display including at least one display driver chip and a flat panel display panel. In the process of performing a gamma correction procedure on the flat display panel, the gamma setting value adjustment method of the present invention generates a plurality of output gamma gray-scale values according to a plurality of input gamma gray-scale values, and makes any adjacent There is a difference between the two output gamma grayscale values. In particular, the present invention makes the difference equal to the power of k, and k is a positive integer, so that the number of the plurality of output gamma gray-scale values is flexible and optional, while the plurality of output gamma gray-scale values The value of the step value is also easy to modulate.

It should be understood that after the digital gamma correction is realized by the same display driver chip using the method for adjusting the gamma setting value of the present invention, it can be adapted to the flat display panel provided by any panel factory in the internal register. Set multiple (corrected) gamma settings as gamma binding points.

In order to achieve the above object, the present invention proposes an embodiment of the method for adjusting the gamma setting value, which is applied to a flat-panel display including at least one display driver chip and a flat-panel display panel, and includes the following steps: adding a plurality of The input gamma gray-scale values are mapped to a plurality of output gamma gray-scale values, and there is a difference between any two adjacent output gamma gray-scale values, and the difference is equal to the power of k; Wherein, k is a positive integer selected from the group consisting of 2, 8, 10 and 16.

In one embodiment, the aforementioned method for adjusting the gamma setting value of the present invention further includes the following step: writing a plurality of the output gamma gray-scale values into a register of the display driving chip.

In one embodiment, the input gamma grayscale value and the output gamma grayscale value are both an RGB grayscale coordinate, which includes red grayscale values, green grayscale values, and blue grayscale values .

In one embodiment, the flat display panel is a self-luminous flat display panel.

The present invention also provides a flat panel display, which includes at least one display driver chip and a flat panel display panel, and the display driver chip has a gamma correction unit for performing a method for adjusting a gamma setting value; the gamma setting value The adjustment method includes the following steps: mapping a plurality of input gamma grayscale values to a plurality of output gamma grayscale values, and making a difference between any two adjacent output gamma grayscale values, the The difference is equal to the power of k; where k is a positive integer selected from the group consisting of 2, 8, 10, and 16.

In one embodiment, the aforementioned method for adjusting the gamma setting value of the present invention further includes the following step: writing a plurality of the output gamma gray-scale values into a register of the display driving chip.

In one embodiment, the input gamma grayscale value and the output gamma grayscale value are both an RGB grayscale coordinate, which includes red grayscale values, green grayscale values, and blue grayscale values .

In one embodiment, the flat display panel is a self-luminous flat display panel.

The present invention also provides an information processing device having the flat panel display of the present invention as described above.

In one embodiment, the information processing device is an electronic device selected from the group consisting of a smart phone, a smart watch, a smart bracelet, a tablet computer, a notebook computer, an all-in-one computer, and an access control device.

1a: flat panel display

11a: Display panel

12a: Gate drive circuit

13a: Source driver circuit

131a: Gamma voltage generation unit

132a: Gamma Correction Unit

1: flat panel display

11: Display panel

12: Gate drive circuit

13: Source driver circuit

131: Gamma voltage generation unit

132: Gamma Correction Unit

S1: Map a plurality of input gamma gray-scale values to a plurality of output gamma gray-scale values, and make a difference between any two adjacent output gamma gray-scale values, and the difference is k power

S2: Write a plurality of the output gamma grayscale values into a register of the display driver chip

Fig. 1 is a block diagram of a conventional flat-panel display; Fig. 2 is a block diagram of a flat-panel display applying a method for adjusting a gamma setting value of the present invention; Fig. 3 is an adjustment of a gamma setting value of the present invention A flow chart of the method; and FIG. 4 is a gamma conversion curve diagram used in the present invention to convert a plurality of input gamma grayscale values into a plurality of output gamma grayscale values.

In order to enable your examiners to further understand the structure, features, objectives, and advantages of the present invention, drawings and detailed descriptions of preferred embodiments are attached as follows.

The present invention mainly discloses a method for adjusting a gamma setting value, which is applied to a display driver chip, so that the display driver chip can perform a gamma adjustment procedure ( Gamma tuning) to generate a plurality of (corrected) gamma setting values, which are called gamma binding points in the industry, that is, a plurality of fixed gamma grayscale values. In addition, when the method for adjusting the gamma setting value of the present invention is used, the display driver chip can adaptively find the corresponding gamma binding point for the flat display panel provided by any panel factory, so that the same gamma binding point can be obtained. The display driver chip can be used in the display driver of any flat panel display panel.

FIG. 2 shows a block diagram of a flat panel display to which a method for adjusting a gamma setting value of the present invention is applied. As shown in FIG. 2 , the flat panel display 1 includes: a flat panel display panel 11 , a gate (column) driving circuit 12 , a source (row) driving circuit 13 , a display controller 14 , and a voltage conversion unit 15 . In one embodiment, the gate driver circuit 12 and the source driver circuit 13 can be adjusted It is combined into a single display driving chip, and it can be seen from FIG. 2 that the source driving circuit 13 includes a gamma (Gamma) voltage generating unit 131 and a gamma correcting unit 132 . It must be emphasized that even though FIG. 2 shows that the gamma voltage generating unit 131 and the gamma correcting unit 132 are included in the source driving circuit 13 , the gate driving circuit 12 and the source driving circuit are also included. For the display driving chip of the circuit 13 , the gamma voltage generating unit 131 and the gamma correcting unit 132 can also be independent circuit units, and are not necessarily included in the source driving circuit 13 .

FIG. 3 shows a flow chart of a method for adjusting a gamma setting value according to the present invention. According to the design of the present invention, the adjustment method of the gamma setting value is to first perform step S1: map a plurality of input gamma gray-scale values to a plurality of output gamma gray-scale values, and make any two adjacent There is a difference between the output gamma grayscale values, and the difference is equal to the power of k, where k is a positive integer. According to different application requirements of the display driver chip, the number of gamma binding points can be determined in advance, for example, 27. Meanwhile, it can be understood that the output gamma grayscale value in step S1 refers to the corrected gamma setting value used as the gamma binding point.

FIG. 4 shows a gamma conversion curve diagram used in the present invention to convert a plurality of input gamma grayscale values into a plurality of output gamma grayscale values. X _n-1 , X _n and X _n+1 in FIG. 4 are three of the 27 gamma binding points. Moreover, FIG. 4 especially shows that there is a difference between any two adjacent gamma binding points (ie, the output gamma gray-scale value obtained after the mathematical operation), and the difference is equal to the power of k , k is a positive integer. In a possible embodiment, k is 2, that is, the difference is a power of 2. However, in other possible embodiments, k may also be 8, 10 or 16. Therefore, the method flow then executes step S2: writing a plurality of the output gamma grayscale values into a register of the display driver chip.

Briefly, as shown in FIG. 2 , the gamma voltage generating unit 131 converts a working voltage V _DD provided by the voltage converting unit 15 into a plurality of reference gamma voltages, and the gamma correcting unit 132 is used for performing A method for adjusting a gamma setting value of the present invention enables the display driver chip to perform a gamma tuning procedure (Gamma tuning) on the flat display panel 11 according to a plurality of input gamma grayscale values. A plurality of output gamma grayscale values are used as a plurality of gamma setting values after correction, and the corrected gamma setting values are written into a register of the display driver chip as a plurality of gamma binding points. In this way, a plurality of data display driving units in the source driving circuit 13 generate corresponding data signals based on 27 gamma binding points and a plurality of the reference gamma voltages after receiving a sequence of data signals sent by the display controller 14 A plurality of driving signals are transmitted to the flat display panel 11 .

It should be noted that engineers who are familiar with the gamma adjustment of the flat panel display 1 should know that the input gamma grayscale value is an RGB grayscale coordinate, which includes a red grayscale value (R _G ) and a green grayscale value. (G _G ) and a blue grayscale value (B _G ). For example, when performing white balance adjustment, the input gamma grayscale value W255 includes R255, G255 and B255, that is, W255=(R255, G255, B255). Similarly, it can be inferred that the output gamma grayscale value is also an RGB grayscale coordinate. Therefore, when performing the mathematical operation process described in step S1, a conversion matrix can be used to convert the input RGB grayscale coordinates into the output RGB grayscale coordinates, eg, W255(IN) into W255(OUT). Certainly, individual mathematical conversion operations can also be performed for the input red grayscale value (R _G ), green gray scale value ( _GG ) and blue gray scale value (B _G ). In this case, there will be three gamma conversion graphs shown in FIG. 4 .

It is repeated that after the gamma conversion operation, there will be a difference between any two adjacent output gamma grayscale values, and the difference is equal to the power of k, for example, the power of 2 power. In the present invention, the difference value is a power of k, so that the number of the output gamma grayscale values can be flexibly selected. For example, according to different application requirements of the display driver chip, the desired Describe the number of output gamma grayscale values (ie, gamma binding points). At the same time, since the design of the present invention makes the difference value to be a power of k, the value of each gamma binding point can be easily modulated.

In this way, the above has completely and clearly explained a method for adjusting the gamma setting value of the present invention; and, through the above, it can be known that the present invention has the following advantages:

(1) The present invention discloses a method for adjusting a gamma setting value, which is applied to a flat panel display including at least one display driver chip and a flat panel display panel. In the process of performing a gamma correction procedure on the flat display panel, the gamma setting value adjustment method of the present invention generates a plurality of output gamma grayscale values according to a plurality of input gamma grayscale values, and makes adjacent There is a difference between any two of the output gamma grayscale values. In particular, the present invention makes the difference value to be a power of k, so that the number of the plurality of output gamma gray-scale values is flexible and selectable, and at the same time, the value of the plurality of output gamma gray-scale values is also Easy to modulate.

(2) The present invention also provides a flat panel display, which includes at least one display driver chip and a flat display panel, and the display driver chip has a gamma correction unit for performing the aforementioned method for adjusting a gamma setting value of the present invention .

(3) The present invention also provides an information processing device having the flat panel display of the present invention as described above. Moreover, the information processing device is an electronic device selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, and access control devices.

It must be emphasized that the above-mentioned disclosure in this case is a preferred embodiment, and any partial changes or modifications originating from the technical ideas of this case and easily inferred by those who are familiar with the art are within the scope of the patent of this case. category of rights.

To sum up, regardless of the purpose, means and effect of this case, it shows that it is completely different from the conventional technology, and its first invention is suitable for practical use, and indeed meets the patent requirements of the invention. Society is to pray for the best.

S1: Map a plurality of input gamma gray-scale values to a plurality of output gamma gray-scale values, and make a difference between any two adjacent output gamma gray-scale values, and the difference is k power

S2: Write a plurality of the output gamma grayscale values into a register of the display driver chip

Claims (12)

A method for adjusting a gamma setting value, which is applied to a flat panel display including at least a display driver chip and a flat panel display panel, and includes the following steps: mapping a plurality of input gamma grayscale values to a plurality of output gamma values There is a difference between any two adjacent output gamma gray-scale values, and the difference is equal to the power of k, where k is a positive integer. The method for adjusting a gamma setting value according to claim 1, wherein k is a positive integer selected from the group consisting of 2, 8, 10 and 16. The method for adjusting a gamma setting value according to claim 1, further comprising the step of: writing a plurality of the output gamma grayscale values into a register of the display driving chip. The method for adjusting a gamma setting value according to claim 1, wherein the input gamma grayscale value and the output gamma grayscale value are both RGB grayscale coordinates, which include red grayscale values, green Grayscale value and blue grayscale value. The method for adjusting a gamma setting value according to claim 1, wherein the flat display panel is a self-luminous flat display panel. A flat panel display comprising at least one display driver chip and a flat panel display panel, and the display driver chip has a gamma correction unit for performing a method for adjusting a gamma setting value; the method for adjusting the gamma setting value includes: The following steps: map a plurality of input gamma gray-scale values to a plurality of output gamma gray-scale values, and make a difference between any two adjacent output gamma gray-scale values, and the difference value is equal to k The power of , k is a positive integer. The flat panel display of claim 6, wherein k is a positive integer selected from the group consisting of 2, 8, 10 and 16. The flat panel display of claim 6, wherein the method for adjusting the gamma setting value further comprises the following step: writing a plurality of the output gamma gray-scale values into a register of the display driving chip. The flat-panel display according to claim 6, wherein the input gamma grayscale value and the output gamma grayscale value are both RGB grayscale coordinates, which include red grayscale values, green grayscale values level value and blue grayscale value. The flat panel display according to claim 6, wherein the flat panel display panel is a self-luminous flat panel display panel. An information processing device having the flat panel display according to any one of claim 6 to claim 10. The information processing device of claim 11, which is an electronic device selected from the group consisting of smart phones, smart watches, smart bracelets, tablet computers, notebook computers, all-in-one computers, and access control devices .

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