TW201440019A - Display apparatus, data gain regulating circuit and data gain regulating method - Google Patents

Abstract

A display apparatus, a data gain regulating circuit and a data gain regulating method are provided. The display apparatus includes a display module, a backlight module and the data gain regulating circuit. The backlight module provides backlight to the display module. The data gain regulating circuit is coupled to the display module and determines a gain in according with ambient light information and backlight information. The data gain regulating circuit regulates display data in according with the gain to obtain regulated display data and transmits the regulated display data to the display module.

Description

Display device, data gain adjustment circuit and data gain adjustment method

The present invention relates to a display device, and more particularly to a data gain adjustment circuit and a data gain adjustment method for a display device.

Liquid crystal displays have become the mainstream of display products based on their low voltage operation, no radiation scattering, light weight and small size. With the popularization of liquid crystal displays, many portable electronic products have gradually increased the display functions of liquid crystal displays, especially portable electronic products such as smart phones, personal digital assistants, notebook computers, tablet computers and the like. These portable electronic products not only need to have a good picture display effect indoors, but also need to maintain good picture quality in an outdoor or strong light environment. Therefore, how to maintain a good display quality of a liquid crystal display in a strong light environment has become one of the important trends in the development of liquid crystal display technology.

Specifically, the liquid crystal display is mainly composed of a backlight module and a display panel. As a result, since the display panel itself does not emit light, the backlight module is used to provide a light source required for the liquid crystal display to display an image. When you use portable electronic products, you can't see the display on the screen as long as you move to a place with a little sunlight. The main reason is that the brightness of the outside sun is too strong, and the sunlight is directly reflected on the screen, which is reflected by the surface, which makes it impossible for the human eye to clearly see the contents of the screen. The current practice is to increase the brightness of the backlight of the display to improve the visibility of the liquid crystal display under strong light.

However, this practice must maintain the brightness of the display backlight above a certain level to avoid dullness due to the surrounding environment being too bright. This method is extremely power-hungry, and in the second place, the user may be glaring because the screen is too bright. Moreover, when the portable electronic device is located in a place where the ambient light source is very strong, even if the brightness of the light source of the display has been adjusted to the strongest, the presentation of the picture details is still not satisfactory. Therefore, in order to make the screen image of the portable electronic product still clearly visible under various environmental light sources (including indoor and outdoor), it is necessary to propose a new display technology with strong light visibility.

In view of this, the present invention provides a display device, a data gain adjustment circuit, and a data gain adjustment method, which can adjust the display data content by using ambient light information and backlight information, thereby improving the picture display quality of the liquid crystal display.

The invention provides a display device, which comprises a display module, a backlight module and a data gain adjustment circuit. Backlight module provides backlight to display mode group. The data gain adjustment circuit is coupled to the display module, and the data gain adjustment circuit determines the gain value according to the ambient light information and the backlight information, and adjusts the display data according to the gain value to obtain the adjusted display data, and transmits the adjusted display data to Display module.

In an embodiment of the invention, the data display adjustment circuit determines the gain value according to the display data, in addition to the ambient light information and the backlight information.

In an embodiment of the present invention, the data display adjustment circuit determines the "display data to gain relationship" according to the ambient light information and the backlight information, and then determines the data according to the display data. The gain value is obtained in "Show data to gain relationship".

In an embodiment of the invention, the display device, wherein the ambient light information display device is in a strong ambient light environment, the data gain adjustment circuit correspondingly increases the gain value. When the ambient light information display device is in a non-strong ambient light environment, the data gain adjustment circuit correspondingly lowers the gain value.

In an embodiment of the present invention, the data display adjustment circuit first converts the original backlight value represented by the backlight information into a target backlight value according to the backlight information and the ambient light information, and then according to the ambient light information and the target. The backlight value adjusts the gain value.

In an embodiment of the invention, the display device, wherein the data gain adjustment circuit further provides a backlight control signal to the backlight module according to the target backlight value.

In an embodiment of the invention, the display device described above, wherein the data is increased The benefit adjustment circuit first converts the original backlight value represented by the backlight information into a target backlight value according to the backlight information and the ambient light information, and then provides a backlight control signal to the backlight module according to the target backlight value.

In an embodiment of the invention, the display device, wherein the data gain adjustment circuit is operable in at least one of the following gain determination modes. The first gain determining mode adjusts the gain value according to the original backlight value represented by the backlight information and the ambient light information, wherein the original backlight value is independent of the ambient light information. The second gain determining mode is: first converting the original backlight value represented by the backlight information into a target backlight value according to the backlight information and the ambient light information, and then adjusting the gain value according to the target backlight value and the ambient light information, wherein the target backlight value and the environment Light information related.

In an embodiment of the invention, the display device, wherein the data gain adjustment circuit is operable in at least one of the backlight control modes described below. The first backlight control mode provides a backlight control signal to the display module according to the original backlight value represented by the backlight information, wherein the backlight control signal is independent of the ambient light information. The second backlight control mode: firstly converts the original backlight value represented by the backlight information into a target backlight value according to the backlight information and the ambient light information, and then provides a backlight control signal to the display module according to the target backlight value, wherein the backlight control signal and the backlight control signal Ambient light information related.

In an embodiment of the invention, the data display adjustment circuit determines an index value according to the backlight information and the ambient light information, and adjusts the gain value by referring to the index to the gain curve according to the index value.

In an embodiment of the invention, the display device described above, wherein the data is increased The benefit adjustment circuit generates an index value based on the indoor brightness threshold.

In an embodiment of the invention, the display device described above, wherein the index to gain curve is related to a gamma characteristic parameter of the panel.

In an embodiment of the present invention, the display device, wherein the data gain adjustment circuit obtains the first gain value after referring to the index to the gain curve, and generates a gain value according to the display data and the first gain value.

In an embodiment of the present invention, in the display device, the data gain adjustment circuit generates a third value according to the display data by referring to the data to the gain curve in the process of generating the gain value according to the display data and the first gain value. The gain value is used as a gain value, wherein the data to gain curve is generated based on the first gain value and the normalized data to the gain curve.

In an embodiment of the present invention, in the display device, after the data gain adjustment circuit obtains the first gain value, the first gain value is first smoothed to generate a second gain value, and then according to the displayed data. The reference data is applied to the gain curve to generate a third gain value as a gain value, wherein the data to gain curve is generated based on the second gain value and the normalized data to the gain curve.

The invention provides a data gain adjustment circuit for a display device. The data gain adjustment circuit comprises a gain determination circuit and a data adjustment circuit. The gain decision circuit determines the gain value based on the backlight information and the ambient light information. The data adjustment circuit is coupled to the gain determination circuit, receives the display data, and adjusts the display data according to the gain value to obtain the adjusted display data.

In an embodiment of the invention, the data gain adjustment circuit described above The medium data adjustment circuit is implemented as a multiplication circuit.

In an embodiment of the invention, the data gain adjustment circuit includes a curve index determination circuit and an index to gain conversion circuit. The curve index determines the circuit to determine the index value based on the backlight information and the ambient light information. The index-to-gain conversion circuit is coupled to the curve index determining circuit, and adjusts the first gain value of the display data by referring to the index to the gain curve according to the index value. The gain decision circuit adjusts the gain value based on the first gain value.

In an embodiment of the invention, the data gain adjustment circuit, wherein the curve index determining circuit determines the index value according to the indoor brightness threshold.

In an embodiment of the invention, the data gain adjustment circuit described above, wherein the index to gain curve is related to a gamma characteristic parameter of the panel.

In an embodiment of the invention, the data gain adjustment circuit, wherein the gain decision circuit further comprises a nonlinear conversion circuit. The nonlinear conversion circuit is coupled between the index-to-gain conversion circuit and the data adjustment circuit, and the nonlinear conversion circuit refers to the data to the gain curve according to the display data to generate a third gain value as the gain value. The data-to-gain curve is generated based on the first gain value and the normalized data to the gain curve.

In an embodiment of the invention, the data gain adjustment circuit includes a rounding circuit and a nonlinear conversion circuit. The smoothing circuit is coupled to the index to gain conversion circuit, and the smoothing circuit makes the change of the first gain value relatively gentle, and generates the second gain value. The nonlinear conversion circuit is coupled between the smooth circuit and the data adjustment circuit, and the nonlinear conversion circuit refers to the data according to the display data. The benefit curve produces a third gain value as a gain value, wherein the data to gain curve is generated based on the third gain value and the normalized data to the gain curve.

In an embodiment of the invention, the data gain adjustment circuit further includes a setting interface and an upper boundary determining circuit. The upper boundary determining circuit is coupled to the nonlinear conversion circuit and the setting interface, and the upper boundary determining circuit controls the nonlinear conversion circuit according to the setting interface to adjust the curve boundary of the third gain value.

In an embodiment of the invention, the data gain adjustment circuit further includes a high dynamic range engine and an upper boundary decision circuit. The upper boundary decision circuit is coupled to the non-linear conversion circuit and the high dynamic range engine. The upper boundary decision circuit controls the nonlinear conversion circuit in accordance with the operation result of the high dynamic range engine to dynamically adjust the curve boundary of the third gain value.

In an embodiment of the invention, the data gain adjustment circuit further includes at least one of the following circuits: a first debounce circuit, a second debounce circuit, and a remapping circuit. The first debounce circuit receives the ambient light information and clamps the ambient light information within the first variation range. The second debounce circuit receives the backlight information and clamps the backlight information within the second variation range. The remapping circuit has a conversion relationship to remap the ambient light information to the new ambient light value and to provide the new ambient light value to the gain decision circuit.

In an embodiment of the invention, the data gain adjustment circuit further includes a backlight adjustment circuit. The backlight adjustment circuit is coupled to the gain determination circuit, and controls the gain determination circuit to adjust the gain value of the display data according to the ambient light information and the backlight information.

In an embodiment of the present invention, the data gain adjustment circuit, wherein the backlight adjustment circuit further outputs a backlight control signal according to the ambient light information and the backlight information, and the backlight control signal is used to control the backlight module to dynamically adjust the backlight brightness.

In an embodiment of the invention, the data gain adjustment circuit described above, wherein the backlight adjustment circuit comprises a target backlight determination circuit. The target backlight determining circuit converts the original backlight value represented by the backlight information into a target backlight value according to the ambient light information and the backlight information, so that the gain determining circuit adjusts the gain value of the display data according to the target backlight value and the ambient light information.

In an embodiment of the present invention, the data gain adjustment circuit, wherein the backlight adjustment circuit further includes at least one of the following circuits, coupled between the target backlight determination circuit and the gain determination circuit: a delay circuit and a smooth circuit. The delay circuit is used to delay the change of the target backlight value. The smooth circuit is used to smooth the change of the target backlight value.

In an embodiment of the invention, the data gain adjustment circuit, wherein the backlight adjustment circuit further comprises a setting interface. The setting interface is coupled to the target backlight determining circuit to provide a human interface for the user to adjust the target backlight value of the target backlight determining circuit.

From another point of view, the present invention provides a data gain adjustment method for a display device, and the data gain adjustment method includes the following steps. The gain value is determined based on the backlight information and the ambient light information. Receiving the display data, and adjusting the display data according to the gain value to obtain the adjusted display data.

Based on the above, the display device of the present invention and its data gain circuit and square The method determines a gain value by combining the backlight information of the backlight module with the ambient light information of the environment in which the display device is located, and uses the gain value to adjust the display data. In this way, not only can the display device be used normally under bright sunlight, but also the user in the strong light can clearly and comfortably view the picture details presented by the display device.

The above described features and advantages of the invention will be apparent from the following description.

10, 30, 40, 50, 60‧‧‧ display devices

110, 310, 410, 510, 610‧‧‧ display modules

120, 320, 420, 520, 620‧‧‧ backlight module

130, 330, 430, 530, 630‧‧‧ data gain adjustment circuit

331, 431, 531, 631‧‧‧ Gain decision circuit

332, 432, 532, 632‧‧‧ data adjustment circuit

337, 338, 637, 638‧‧‧ debounce circuit

339, 639‧‧‧Remapped circuits

3311, 4311, 6311‧‧‧ curve index decision circuit

3312, 4312, 6312‧‧‧ index to gain conversion circuit

3313, 4313, 6313‧‧‧ round circuit

3314, 4314, 6314‧‧‧ Nonlinear conversion circuit

433, 633‧‧‧ upper boundary decision circuit

434, 634‧‧‧Setting interface

435, 635‧‧‧High dynamic range engine

536, 636‧‧‧ backlight adjustment circuit

5361, 6361‧‧‧ target backlight decision circuit

5362, 6362‧‧‧ delay circuit

5363, 6363‧‧‧round circuit

5364, 6364‧‧‧Setting interface

AL‧‧‧ Ambient Light Information

AL_d‧‧‧ Ambient light output

BL‧‧‧Backlight Information

BL_d‧‧‧Backlight output

BL _new , BL_2‧‧‧ target backlight value

BL _old ‧‧‧ original backlight value

G, G_1, G_2, G_3‧‧‧ gain values

Inx‧‧‧ index value

Ctr‧‧‧ backlight control signal

S201~S203‧‧‧Steps

TP1, TP2‧‧‧ time interval

V‧‧‧ Display data

V’‧‧‧ Adjusted display data

FIG. 1 is a block diagram of a display device according to an embodiment of the invention.

2 is a flow chart of a data gain adjustment method according to an embodiment of the invention.

FIG. 3 is a block diagram of a display device according to an embodiment of the invention.

4 is a schematic diagram showing the relationship between input and output of a debounce circuit according to an embodiment of the invention.

FIG. 5 is a schematic diagram showing the relationship between input and output of a remapping circuit according to an embodiment of the invention.

FIG. 6 is a functional block diagram of a gain decision circuit according to an embodiment of the invention.

FIG. 7 is a diagram showing original data and adjusted data according to an embodiment of the invention. Schematic diagram of the relationship.

FIG. 8 is a schematic diagram of a gamma curve according to an embodiment of the invention.

FIG. 9 is a schematic diagram of a conversion curve of an index to gain conversion circuit according to an embodiment of the invention.

FIG. 10 is a schematic diagram showing waveforms of output signals of a round circuit according to an embodiment of the invention.

FIG. 11 is a schematic diagram showing waveforms of output signals of a smooth circuit according to an embodiment of the invention.

FIG. 12 is a schematic diagram showing waveforms of output signals of a round circuit according to an embodiment of the invention.

FIG. 13 is a schematic diagram showing waveforms of output signals of a smooth circuit according to an embodiment of the invention.

FIG. 14A is a schematic diagram of a normalized data to gain curve according to an embodiment of the invention.

FIG. 14B is a schematic diagram showing a conversion curve of a nonlinear conversion circuit according to an embodiment of the invention.

FIG. 15 is a functional block diagram of a display device according to an embodiment of the invention.

FIG. 16 is a functional block diagram of a display device according to an embodiment of the invention.

FIG. 17 is a functional block diagram of a backlight adjustment circuit according to an embodiment of the invention.

FIG. 18 is a schematic diagram showing the relationship between ambient light output and backlight output of a delay circuit according to an embodiment of the invention.

FIG. 19 is a functional block diagram of a display device according to an embodiment of the invention.

The term "coupled" as used throughout the specification (including the scope of the patent application) may be used in any direct or indirect connection. For example, if the first device is described as being coupled to the second device, it should be construed that the first device can be directly connected to the second device, or the first device can be connected through other devices or some kind of connection means. Connected to the second device indirectly. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

In some of the following embodiments, the adaptive adjustment of the data gain can be made according to different ambient light brightness and backlight information, so that the display content can be more clearly presented under strong light. In addition, in some other embodiments described below, the brightness of the backlight may be adjusted according to the ambient light brightness and the backlight information, and the data gain may be adjusted according to the adjusted backlight brightness. In still other embodiments, the two embodiments can be combined to be different modes of operation.

FIG. 1 is a block diagram of a display device according to an embodiment of the invention. Referring to FIG. 1, the display device 10 is, for example, a liquid crystal display (liquid crystal The display module (LCD) includes a display module 110, a backlight module 120, and a data gain adjustment circuit 130. In some embodiments, the display module 110 can include a display panel, a zoom controller, a timing controller, a source drier, and/or a gate driver. The display module 110 is coupled to the data gain adjustment circuit 130 to receive the adjusted display data V'. The display module 110 drives its display panel in accordance with the display material V' of the image. The backlight module 120 is configured to provide a backlight to the display panel of the display module 110. In this embodiment, the backlight module 120 can control the brightness of the backlight according to a pulse width modulation (PWM) signal. In addition, the backlight module 120 can be divided into a direct-lit backlight module or an edge-lit backlight module according to the manner in which the backlight is provided. The present invention is not limited thereto.

The data gain adjustment circuit 130 is an integrated circuit with an arithmetic function, and the data gain adjustment circuit 130 is coupled to the display module 110. The data gain adjustment circuit 130 of the present invention can adaptively adjust the data gain according to different ambient light information AL and backlight information BL. Further, the data gain adjustment circuit 130 receives the ambient light information AL, the backlight information BL, and the display material V. The backlight information BL depends on the backlight brightness of the backlight module 120, and the ambient light information AL depends on the brightness of the environment in which the display device 10 is located. In some embodiments, the display device 10 is configured with an optical sensor for sensing the brightness of the environment in which the display device 10 is located. The photo sensor is, for example, a photo-diode, a photo-crystal, a photoresistor, or other photo current capable of generating a photo current or other sensing signal after receiving the light. In simple terms, ambient light The information AL will depend on the sensing signal of the light sensor.

To further illustrate the present invention, FIG. 2 is a flow chart of a data gain adjustment method according to an embodiment of the invention. Referring to FIG. 1 and FIG. 2 simultaneously, the method of the present embodiment is applied to the display device 10 described above. Hereinafter, the detailed steps of the data gain adjustment method of the present embodiment will be described with reference to various elements in the display device 10.

In step S201, the data gain adjustment circuit 130 of the display device 10 determines the gain value in accordance with the ambient light information AL and the backlight information BL. In other words, the gain value is a parameter obtained by combining the ambient light information AL and the backlight information BL. Therefore, the display device 10 can adaptively adjust the data gain value according to different ambient light levels. Next, in step S203, the data gain adjustment circuit 130 receives the display material V, and according to the gain value, adjusts the display material V to obtain the adjusted display data V'. Thereafter, the data gain adjustment circuit 130 transmits the adjusted display data V' to the display module 110. That is to say, the display device 10 can adaptively adjust the display data V according to the environment in which it is located, so that the display module 110 can clearly display the screen image to the user according to the adjusted display data V' in various environments. .

For example, when the ambient light information AL indicates that the display device 10 is in a strong ambient light environment, the data gain adjustment circuit 130 correspondingly increases the gain value so that the user can easily view the display module 110 of the display device 10. Picture detail. When the ambient light information AL indicates that the display device 10 is in a non-strong ambient light environment, the data gain adjustment circuit 130 correspondingly lowers the gain value. For example, if the display device 10 is located in an appropriate indoor environment of the light source, the data gain adjustment circuit 130 does not need to adjust the display because the user can clearly view the entire image frame. Information V. At this time, the data gain adjustment circuit 130 can adjust the gain value to 1, that is, the content of the display material V is not changed.

It is worth mentioning that in other embodiments, the data gain adjustment circuit 130 can determine the gain value according to the display data V in addition to the ambient light information AL and the backlight information BL. In detail, for example, the data gain adjustment circuit 130 first determines the "display data to gain relationship" based on the ambient light information AL and the backlight information BL, and then based on the displayed data V, the relationship between the displayed data and the gain is determined. Gain value is obtained in . For example, "display data to gain relationship" can be represented by "display data to gain relationship curve". Therefore, the data gain adjustment circuit 130 can obtain the corresponding gain value from the determined "display data to gain relationship curve" based on the original display data V, but the present invention is not limited thereto.

Therefore, the data gain adjustment circuit 130 of the display device 10 can adaptively determine the gain value G according to the ambient light information AL, the backlight information BL, and the display data V, and adjust according to the gain value to suit various environments. Displayed data displayed. In order to further explain how the data gain circuit of the present invention obtains the gain value and how to adjust the display data, the following detailed description will be given.

FIG. 3 is a block diagram of a display device according to another embodiment of the invention. Referring to FIG. 3 , the display device 30 includes a display module 310 , a backlight module 320 , and a data gain adjustment circuit 330 . The display module 310 and the backlight module 320 are similar or similar to the display module 110 and the backlight module 120 shown in FIG. 1 and will not be further described herein. In the present embodiment, the data gain adjustment circuit 330 includes a gain decision circuit 331 and a data adjustment circuit 332. In short, the gain decision circuit 331 is based on The gain value G is determined by the backlight information BL and the ambient light information AL. The data adjustment circuit 332 is coupled to the gain decision circuit 331. The data adjustment circuit 332 receives the display data V, and adjusts the display data V according to the gain value G to obtain the adjusted display data V'. It should be noted that, in this embodiment, the data adjustment circuit 332 can be implemented as a multiplication circuit. After the data adjustment circuit 332 implemented as the multiplication circuit obtains the gain value G, the data adjustment circuit 332 multiplies the original display data V by the corresponding gain value G to obtain the adjusted display data V' to adjust the display data V. Purpose, but the invention is not limited thereto.

As described above, the gain determination circuit 331 can directly acquire the gain value G in accordance with the backlight information BL and the ambient light information AL. In addition, in some embodiments, in addition to the backlight information BL and the ambient light information AL, the gain determining circuit 331 can determine the "display data to gain relationship" according to the display data V, wherein "display data to gain relationship" can be "Show data to gain curve" or lookup table to indicate. Accordingly, the gain determination circuit 331 can obtain the corresponding gain value G from the determined "display data to gain relationship curve" based on the original display data V, and transmit the gain value G to the data adjustment circuit 332. It can be seen that the gain determining circuit 331 can establish the relationship between the display data V and the gain value G, so that the gain determining circuit 331 can find the corresponding gain value G according to the display data V. However, the present invention does not limit the operation mode adopted by the gain decision circuit 331.

In the present embodiment, the gain decision circuit 331 calculates a function in response to the backlight information BL and the ambient light information AL to obtain a corresponding gain value G. For example, the gain decision circuit 110 can calculate the function shown in the formula (1) to obtain the gain value G. Among them, BL _full is the backlight information under _full backlight (for example, the duty ratio of the backlight is 100%), AL is ambient light information, and BL is backlight information.

It is important to note that the IL shown in equation (1) is defined as the indoor brightness threshold. This room brightness threshold defines the boundaries of the room's indoor brightness range that the user can comfortably view. The indoor brightness threshold can be adjusted according to the actual application. In general, if the brightness of the ambient light in the environment in which the display device 30 is located exceeds the indoor brightness threshold, it can be considered that the display device 30 is located in a strong light environment. BL _full can be taken as equal to the maximum gray level of the pixels in the display data. For example, if the display data V is 8-bit data, since the display data V can represent gray scale 0~255, the maximum gray level is 255. However, the function shown in the formula (1) is merely an exemplary embodiment, and the present invention is not limited thereto. Thereafter, the data adjustment circuit 332 can calculate the product of the display data V and the gain value G to obtain a new display material, that is, the adjusted display data V'. The data adjustment circuit 332 transmits the new display data V' to the display module 310, so that the display module 310 can display the adjusted display data V' provided by the data adjustment circuit 332.

In addition, as shown in FIG. 3, the data gain adjustment circuit 330 of the present embodiment may further include a debounce circuit 337, a debounce circuit 338, and a remap circuit 339. The debounce circuit 337 receives the ambient light information AL and clamps the ambient light information AL within the first variation range, and the debounce circuit 338 The backlight information BL is received and the backlight information BL is clamped within the second variation range. Furthermore, the remapping circuit 339 has a conversion relationship to remap the ambient light information AL to the new ambient light value and to provide the new ambient light value to the gain decision circuit 331.

In addition, it should be noted that although the embodiment of the embodiment is as shown in FIG. 3, this embodiment may be modified according to actual application conditions and design requirements. For example, the data gain adjustment circuit 330 may omit one of the debounce circuit 337, the debounce circuit 338, and the remapping circuit 339. For example, in some embodiments, remapping circuitry 339 can be removed. In other embodiments, the debounce circuit 337, the debounce circuit 338, and the remapping circuit 339 may all be omitted, and the ambient light information AL and the backlight information BL are directly supplied to the gain decision circuit 331.

As can be seen from the above, the ambient light information AL depends on the sensing signal of the photo sensor. Therefore, different types of light sensors have different sensing error ranges for their sensing signals. In addition, a single light sensor may also cause the light sensor to measure different brightness values in the same brightness environment due to various factors. To address this issue, debounce circuit 337 is used to clamp ambient light information within an acceptable range of variation. In detail, FIG. 4 is a schematic diagram showing the relationship between input and output of a debounce circuit according to an embodiment of the invention. Referring to FIG. 4, the horizontal axis of FIG. 4 represents the input AL_i of the debounce circuit 337, and the vertical axis represents the output AL_o of the debounce circuit 337. As can be seen from FIG. 4, the debounce circuit 337 can convert the input luminance value in a certain interval th_1~th_n into a fixed output luminance value. For example, as shown in FIG. 4, when the debounce circuit 337 receives ambient light information having a luminance value of cur_in, the debounce circuit 337 outputs ambient light information having a luminance value of cur_out. Therefore through the debounce circuit The indicator 87 can prevent the ambient light information AL received by the gain determining circuit 331 from constantly changing due to the error of the photo sensor, thereby increasing the stability of the circuit. The present invention does not limit the implementation of the debounce circuit 337. In some embodiments, the debounce circuit 337 can be a hysteresis circuit. Similarly, the debounce circuit 338 can also clamp the backlight information BL within an acceptable range of variation.

On the other hand, the remapping circuit 339 has a conversion relationship for re-mapping the ambient light information AL output by the debounce circuit 337 to the new ambient light value, so that the gain value G determined by the gain decision circuit 331 can be adapted to the actual application state. Or different gain values G are obtained in special cases. For example, FIG. 5 is a schematic diagram showing the relationship between input and output of a remapping circuit according to an embodiment of the invention. Referring to FIG. 5, the horizontal axis of FIG. 5 represents the input RM_i of the remapping circuit 339, and the vertical axis represents the output RM_o of the remapping circuit 339. As shown in FIG. 5, if the input of the remapping circuit 339 is c_i1, the output of the remapping circuit 339 is c_o1. If the input of the remapping circuit 339 is c_i2, the output of the remapping circuit 339 is c_o2. It should be specially stated that the above conversion relationship can be defined according to design requirements or customized requirements. For example, the slope of the input and output corresponding to the oblique line of the remapping circuit 339 can be set according to different situations to meet the needs of practical applications.

As shown in FIG. 3, in the present embodiment, the gain determining circuit 331 can determine the "display data to gain" according to the backlight information output by the debounce circuit 338 and the new ambient light value output by the remapping circuit 339. Relationship curve." Then, the gain decision circuit 331 can further obtain the corresponding gain value G from the determined "display data to gain relationship curve" based on the original display data V.

Based on this, FIG. 6 is a functional block diagram of the gain decision circuit 331 of FIG. Referring to FIG. 3 and FIG. 6 together, the gain decision circuit 331 includes a curve index decision circuit 3311, an index to gain conversion circuit 3312, a smooth circuit 3313, and a nonlinear conversion circuit 3314. The curve index determining circuit 3311 determines the index value Inx based on the backlight information BL and the ambient light information AL. The index-to-gain conversion circuit 3312 is coupled to the curve index determining circuit 3311, and adjusts the first gain value G_1 of the display data by referring to the "index-to-gain curve" according to the index value Inx, wherein the gain determining circuit 331 is based on the first gain value. Adjust the gain value G by G_1. It should be noted that the contents of the embodiment shown in FIG. 6 can be changed as needed according to actual application and design requirements. For example, the gain decision circuit 331 may include only the curve index decision circuit 3311 and the index to gain conversion circuit 3312, and directly use the first gain value G_1 outputted by the index to the gain conversion circuit 3312 as the gain value G. That is to say, any one of the rounding circuit 3113 and the nonlinear conversion circuit 3114 can be removed from the gain determining circuit 331 or both can be removed, which is not limited by the present invention.

In the present embodiment, according to the relationship between the backlight information BL and the ambient light information AL, the curve index determining circuit 3311 can calculate/determine the index value Inx of the gain, and output the index value Inx to the index to the gain conversion circuit. 3312. The present invention does not limit the conversion mode adopted by the curve index decision circuit 3311. In this embodiment, the curve index determining circuit 3311 can calculate a function in response to the backlight information BL and the ambient light information AL to obtain an index value Inx. For example, the curve index decision circuit 3311 can acquire the index value Inx according to the calculation function shown in the formula (2). Where Inx is the index of the gain, IL is the threshold of the indoor brightness, and AL is the ambient light. News, BL is the backlight information. As can be seen from the formula (2), the curve index determining circuit 3311 can further determine the index value Inx based on the indoor brightness threshold IL.

Based on the explanation about the formula (1) and the formula (2), the index-to-gain curve in the present embodiment can be presented as the relationship shown in the formula (3).

The index-to-gain curve is as shown in the formula (3), but the present invention does not limit the conversion relationship between the ambient light information AL and the backlight information BL and the index value Inx, and the correspondence between the index Inx and the gain value G may be This is implemented by a lookup table (LUT), but the present invention is not limited thereto. For example, in some other embodiments, the form of the function f in the formula (1) or the formula (3) may be determined according to the gamma (GAMMA) parameter γ of the display panel characteristic of the display module 310. Therefore, the gain value G can be obtained according to the calculation function shown in the formula (1) or the formula (3). FIG. 7 is a schematic diagram showing the relationship between original data and adjusted data according to an embodiment of the invention. In detail, the horizontal axis in Fig. 7 indicates the original display material V, and the vertical axis indicates the display data V' output from the data adjustment circuit 332 to the display module 310. Referring to FIG. 7, since the human eye is different in sensitivity to different gray levels (brightness), the gamma curve defines the original display data V and the display data adjusted by the gamma parameter γ for the sensitivity of the human eye. The relationship between V'.

In addition, FIG. 8 is a schematic diagram of a gamma curve according to an embodiment of the invention. In Fig. 8, the horizontal axis represents the original display material V, and the vertical axis represents the display luminance L of the display module 310. Among them, brightness . As can be clearly seen from FIG. 8, the gamma curve is also different by controlling the backlight brightness provided by the backlight module 320 (ie, adjusting the backlight information BL). Therefore, based on the assumption that the original display material V has the same brightness as the original backlight value under the new backlight value, the formula (4) is obtained and the formula (5) is derived. Where G is the gain value, IL is the indoor brightness threshold, AL is the ambient light information, BL is the backlight information, BL _full is the backlit information of the backlight, and V' is the output of the data adjustment circuit 332 to the display module 310. Data, V is the original display material, and γ is the gamma parameter related to the display panel characteristics of the display module 310. It can be seen that if the gamma parameter γ of the panel is used to determine the form of the function f in the formula (1) or the formula (3), the index-to-gain curve will be related to the characteristic parameter γ of the display panel.

According to the index value Inx, the index-to-gain conversion circuit 3312 can calculate/determine the first gain value G_1 of the display material V, and output the first gain value G_1 to the rounding circuit 3313. In the present embodiment, the index-to-gain conversion circuit 3312 can find the corresponding first gain value G_1 in the "index-to-gain conversion curve" according to the index value Inx of the gain. Based on the above, the present invention does not limit the index to the gain. The conversion method adopted by the conversion circuit 3312. For example, FIG. 9 is a schematic diagram showing the conversion curve of the index to gain conversion circuit 3312 shown in FIG. 6 according to an embodiment of the invention. Figure. Here, the horizontal axis represents the index value Inx, and the vertical axis represents the output signal of the index to gain conversion circuit 3312 (ie, the first gain value G_1). The index-to-gain conversion circuit 3312 can determine the index value Ink outputted by the circuit 3311 according to the curve index, and find the corresponding first gain value G_1 in the conversion curve shown in FIG.

With continued reference to FIG. 6, the gain decision circuit 331 further includes a rounding circuit 3313 and a nonlinear conversion circuit 3314. The rounding circuit 3313 is coupled to the index to gain conversion circuit 3312. The rounding circuit 3313 can make the change of the first gain value G_1 relatively gentle, and generate the second gain value G_2. However, the rounding manner adopted by the rounding circuit 3313 is not limited here. The smoothing circuit 3313 can adopt an arithmetical (Arithmetical) method of rounding, such as an equalization method. FIG. 10 and FIG. 11 are schematic diagrams showing waveforms of output signals of the round circuit 3313 according to an embodiment of the invention. Here, the horizontal axis represents time t, and the vertical axis represents the output signal Gain_arith of the round circuit 3313. Referring to FIG. 10, when the input signal of the rounding circuit 3313 has a rising edge, the output signal waveform of the rounding circuit 3313 exhibits an arithmetic increment. Referring to FIG. 11, when the input signal of the rounding circuit 3313 has a falling edge, the output signal waveform of the rounding circuit 3313 exhibits an arithmetically decreasing value.

In addition, the smoothing circuit 3313 can also adopt a geometrical (round) manner, such as an equal ratio method. FIG. 12 and FIG. 13 are schematic diagrams showing waveforms of output signals of the smoothing circuit 3313 according to an embodiment of the invention. Here, the horizontal axis represents time t, and the vertical axis represents the output signal Gain_geo of the round circuit 3313. Referring to FIG. 12, when the input signal of the smoothing circuit 3313 has a rising edge, the output signal waveform of the rounding circuit 3313 is proportionally increased. Please refer to Figure 13, when the round circuit When the input signal of 3313 has a falling edge, the output signal waveform of the smoothing circuit 3313 is proportionally decremented. Regardless of the sleek mode, the smoothing circuit can change the gain value of the present invention in a more gradual manner, so that the display device 30 can change the brightness of the displayed data in a relatively smooth manner, so that the user can comfortably view the picture. .

On the other hand, the nonlinear conversion circuit 3314 is coupled between the round circuit 3313 and the data adjustment circuit 332. The nonlinear conversion circuit 3314 refers to the data to the gain curve according to the display data V to generate a third gain value G_3 as the gain value G. The data to gain curve is generated according to the second gain value G_2 and the normalized data to the gain curve. In detail, the nonlinear conversion circuit 3314 can convert the second gain value G_2 output from the round circuit 3313 into the third gain value G_3 in a nonlinear manner, and output the third gain value G_3 to the data adjustment circuit 332. However, the conversion method adopted by the nonlinear conversion circuit 3314 is not limited herein.

For example, FIG. 14B is a schematic diagram of a normalized data to gain curve according to an embodiment of the invention. The horizontal axis represents the original display material V, and the vertical axis represents the gain value G_3 of the nonlinear conversion circuit 3314. As shown in FIG. 14B, a plurality of different normalized data can be represented to the gain curve by means of different look-up tables (LUTs). Different normalized data can be obtained through different lookup tables to the gain curve, such as curve M or curve N in Fig. 14B, and the normalized data to gain curve can be determined according to actual application requirements. Generally, the normalized data-to-gain curve is a concave curve as shown in FIG. 14B, so that the relationship between the original display data V and the adjusted display data V' can be avoided. .

FIG. 14A is a diagram showing a nonlinear conversion circuit according to an embodiment of the invention. Schematic diagram of the conversion curve. The horizontal axis represents the original display material V, and the vertical axis represents the gain value G_3 of the nonlinear conversion circuit 3314. In detail, in this embodiment, the normalized data shown in FIG. 14B can be multiplied by the gain curve M or N by the second gain value G_2 outputted by the round circuit 3313, and then the multiplied result is further added to 1. The data as shown in Fig. 14A can be generated to the gain curve P.

As can be seen from FIG. 14A, when the original display material V is larger than the upper boundary, the third gain value G_3 output by the nonlinear conversion circuit 3314 will remain at 1. Therefore, the nonlinear conversion circuit 114 can avoid the problem of displaying picture saturation distortion. In detail, when the data adjustment circuit 332 multiplies the display material V by the gain G, there may be a problem of saturation distortion. This is because the part of the display data with the high original brightness in the picture may be adjusted to the same brightness maximum value by multiplying the gain value G, thus causing the problem of saturation distortion of the picture. . Therefore, as shown in FIG. 14A, the nonlinear conversion circuit 3314 determines the corresponding third gain value G_3 as the gain value G outputted by the gain decision circuit 331 in accordance with the display material V. The third gain value G_3 corresponding to the display data V whose luminance value is bounded from the upper boundary to the maximum gray scale will approach 1. That is to say, the display data whose luminance value is larger than the upper boundary is maintained at the original luminance value, that is, the display data with high luminance value is not changed.

It should be noted that, in this embodiment, the first gain value G_1 generated by the index gain conversion circuit 3312 and the second gain value G_2 generated by the rounding circuit are all global gain values, instead of The third gain value G_3 output by the linear conversion circuit 3314 is a local gain value. In simple terms, this is The gain determining circuit 331 in the embodiment first determines the global first gain value G_1 and the second gain value G_2 according to the backlight information BL and the ambient light information AL. Thereafter, the gain decision circuit 331 determines the regional third gain value G_3 based on the display material V. In short, the third gain value G_3 changes in response to the content of the display material V, and the first gain value G_1 and the second gain value G_2 do not change in response to the difference in the content of the display material V.

That is, in other embodiments, without the presence of the non-linear conversion circuit 3314, the data adjustment circuit 332 can adjust the content of the display material V as a whole using only the global gain value. That is to say, the display device 30 generates a global gain value only based on the backlight information BL and the ambient light information AL. In short, at this time, the gain values of all display data V are the same, and the gain value does not change with the display data.

FIG. 15 is a block diagram of a display device according to another embodiment of the invention. Referring to FIG. 15 , the display device 40 includes a display module 410 , a backlight module 420 , and a data gain adjustment circuit 430 . The display module 410 is similar to or similar to the display module 110 and the backlight module 120 shown in FIG. 1 , and details are not described herein. The embodiment shown in Fig. 15 can be analogized with reference to the related description of Fig. 1 or Fig. 3. Unlike the display device 30 shown in FIG. 3, the data gain adjustment circuit 430 of the display device 40 may not have the debounce circuit and the remapping circuit, but the gain decision circuit 431 directly receives the ambient light information AL and the backlight information BL. Furthermore, the curve index determining circuit 4311, the index to gain conversion circuit 4312, the rounding circuit 413, and the nonlinear conversion circuit 4314 inside the gain determining circuit 431 The material adjustment circuit 432 can refer to the related descriptions of the curve index determination circuit 3311, the index to gain conversion circuit 3312, the rounding circuit 3313, and the nonlinear conversion circuit 3314 in the gain determination circuit 331 shown in FIG. 6 and the data adjustment circuit 332 shown in FIG. Therefore, it will not be repeated here.

It should be noted that, unlike the embodiment shown in FIG. 3, the display device 40 of the present embodiment further includes an upper boundary determining circuit 433, a setting interface 434, and a high dynamic range (HDR) 435. The upper boundary determining circuit 433 is coupled to the nonlinear converting circuit 4314 and the setting interface 434, and the upper boundary determining circuit 433 controls the nonlinear converting circuit 4314 according to the setting interface 434 to adjust the curve boundary of the third gain value G_3, for example, adjusting FIG. 14B. Show the upper boundary. In addition, the upper boundary decision circuit 433 is also coupled to the high dynamic range engine 435. The upper boundary decision circuit 433 can also control the nonlinear conversion circuit 4314 in accordance with the operation result of the high dynamic range engine 435 to dynamically adjust the curve boundary of the third gain value G_3, for example, to adjust the upper boundary shown in FIG. 14B. The implementation of the high dynamic range engine 435 may be a conventional high dynamic range engine or other similar functions, and thus will not be described herein.

Based on the related description of FIG. 14B, the nonlinear conversion circuit 4314 can maintain the display material V whose luminance value is higher than the upper boundary to the original state (because G is 1 at this time). In the present embodiment, the setting interface 434 provides a human interface for the user to adjust/change the upper boundary shown in FIG. 14B. In other words, the upper boundary decision circuit 433 can control the non-linear conversion circuit 4314 according to the setting interface 434 to adjust the upper boundary shown in FIG. 14B. In addition, the upper boundary determining circuit 1330 can also The nonlinear conversion circuit 4314 is controlled in accordance with the operation result of the high dynamic range engine 435 to dynamically adjust the upper boundary shown in FIG. 14B, which is not limited by the present invention.

FIG. 16 is a functional block diagram of a display device according to still another embodiment of the present invention. Referring to FIG. 16 , the display device 50 includes a display module 510 , a backlight module 520 , and a data gain adjustment circuit 530 . The display module 510 is similar to or similar to the display module 110 and the backlight module 120 shown in FIG. 1 , and details are not described herein again. The embodiment shown in Fig. 16 can be analogized with reference to the related description of Fig. 1 or Fig. 3. Unlike the display device 30 shown in FIG. 3, the data gain adjustment circuit 530 of the display device 50 shown in FIG. 16 may not have a debounce circuit and a remapping circuit. Furthermore, the gain determining circuit 531 and the data adjusting circuit 532 shown in FIG. 16 are similar to the gain determining circuit 331 and the data adjusting circuit 332 shown in FIG. 3. Therefore, the internal operation mode and function can refer to the gain determining circuit 331 shown in FIG. The analogy with the data adjustment circuit 332 is analogous.

Different from the embodiment shown in FIG. 3, the embodiment shown in FIG. 16 further includes a backlight adjustment circuit 536. Referring to FIG. 16, the backlight adjustment circuit 536 is coupled to the gain determination circuit 531, and controls the gain determination circuit 531 to adjust the gain value G of the display data V according to the ambient light information AL and the backlight information BL. The backlight adjustment circuit 536 further outputs the backlight control signal ctr to the backlight module 520 according to the ambient light information AL and the backlight information BL. The backlight control signal ctr is used to control the backlight module 520 to dynamically adjust the backlight brightness.

The data gain adjustment circuit 530 is operable to operate at least one of the first gain decision mode and the second gain decision mode. When the data gain adjustment circuit 530 operates in the first gain decision mode, the backlight adjustment circuit 536 supplies the original backlight value BL _old and the ambient light information AL represented by the backlight information BL to the gain decision circuit 531, so that the gain decision circuit 531 is based on the original The backlight value BL _old and the ambient light information AL adjust the gain value G, wherein the original backlight value BL _{old is} independent of the ambient light information AL. When the data gain adjustment circuit 530 operates in the second gain determination mode, the backlight adjustment circuit 536 first converts the original backlight value BL _old represented by the backlight information BL into the target backlight value BL _new according to the backlight information BL and the ambient light information AL. The target backlight value BL _new and the ambient light information AL are supplied to the gain decision circuit 531 such that the gain decision circuit 531 adjusts the gain value G according to the target backlight value BL _new and the ambient light information AL, wherein the target backlight value BL _new and the ambient light Information AL related.

In addition, the data gain adjustment circuit 530 is operable to operate at least one of the first backlight control mode and the second backlight control mode. When the data gain adjustment circuit 530 operates in the first backlight control mode, the backlight adjustment circuit 536 provides the backlight control signal ctr to the backlight module 520 according to the original backlight value BL _old represented by the backlight information BL, wherein the backlight control signal ctr and the environment Light information AL has nothing to do. When the data gain adjustment circuit 530 operates in the second backlight control mode, the backlight adjustment circuit 536 first converts the original backlight value BL _old represented by the backlight information BL into the target backlight value BL _new according to the backlight information BL and the ambient light information AL. Then, the backlight control signal ctr is provided to the backlight module 520 according to the target backlight value BL _new , wherein the backlight control signal ctr is related to the ambient light information AL.

Specifically, the backlight adjustment circuit 536 adjusts the backlight module in the first backlight mode, that is, the data gain adjustment circuit 530 does not adjust according to the ambient light information AL. Under the premise of the backlight brightness of 520, the backlight control signal ctr is independent of the ambient light information AL. The backlight adjustment circuit 536 can control the gain determination circuit 531 according to the ambient light information AL and/or the backlight information BL to adjust the gain value G of the display data V correspondingly. For example, when the electronic device is under strong ambient light (for example, sunlight), the backlight adjusting circuit 536 can control the gain determining circuit 531 according to the ambient light information AL and the backlight information BL, so as to correspondingly increase the gain value of the display data V. G.

Under strong ambient light, the higher the gain value G of the display material V, the easier it is for the user to view the picture details presented by the display module 510. Therefore, without adjusting the backlight brightness of the backlight module 520, the backlight adjustment circuit 536 can control the gain determination circuit 531 according to the ambient light information AL and/or the backlight information BL to adjust the gain value G of the display data V correspondingly. For example, the backlight adjustment circuit 536 can pre-define the indoor brightness threshold. When the ambient light information AL is greater than the indoor brightness threshold, it can be known that the electronic device is under strong ambient light, so the backlight adjustment circuit 536 can control the gain determination circuit 531 according to the ambient light information AL and the backlight information BL, so as to adjust the display accordingly. The gain value G of the data V.

On the other hand, when the backlight adjustment circuit 536 is in the second backlight mode, the backlight adjustment circuit 536 can control the backlight module 520 according to the ambient light information BL and the backlight information AL to adjust the backlight brightness accordingly. That is to say, the backlight control signal ctr output by the backlight adjustment circuit 536 is related to the ambient light information AL. Further, the backlight adjustment circuit 536 can control the gain decision circuit 531 in accordance with the adjustment of the backlight brightness to adjust the gain value G of the display data V correspondingly. For example, the backlight adjustment circuit 536 can adjust the brightness of the display to increase the display data V accordingly. The benefit G allows the user to view the picture details presented by the display module 510 in strong ambient light. In detail, under strong ambient light, the brightness of the backlight provided by the backlight module 520 is brighter, and the user is more likely to view the picture presented by the display module 510. However, in some application scenarios, the picture detail presented by display module 510 may remain unclear, even though the brightness of the backlight is adjusted to be the brightest. Therefore, the backlight adjustment circuit 536 can control the gain determination circuit 531 in accordance with the adjustment of the backlight brightness so as to correspondingly adjust the gain value G of the display material V.

Based on this, FIG. 17 is a functional block diagram of the backlight adjustment circuit 536 of FIG. Referring to FIG. 16 and FIG. 17 together, the backlight adjustment circuit 536 includes a target backlight determination circuit 5361, a delay circuit 5362, a rounding circuit 5363, and a setting interface 5364. Although the embodiment of the embodiment is as shown in FIG. 17, this embodiment can be modified according to actual application conditions and design requirements. For example, the backlight adjustment circuit 536 can omit one of the delay circuit 5362 and the round circuit 5363. For example, in some embodiments, the rounding circuit 5363 can be removed. In other embodiments, the delay circuit 5362 and the rounding circuit 5363 may all be omitted, and the ambient light information AL and the target backlight value BL _new output by the target backlight determining circuit 5361 may be directly supplied to the gain determining circuit 531. Therefore, the target backlight determining circuit 5361 converts the original backlight value BL _old represented by the backlight information BL into the target backlight value BL _new according to the ambient light information AL and the backlight information BL, so that the gain determining circuit 531 is based on the target backlight value BL _new The gain value G of the display data V is adjusted with the ambient light information AL.

In detail, the target backlight determination circuit 5361 can determine the target backlight value BL _{new in} accordance with the ambient light information AL and the backlight information BL. However, the present invention does not limit the operation mode adopted by the target backlight decision circuit 5361. In the present embodiment, the target backlight decision circuit 5361 can calculate a function in response to the backlight information BL and the ambient light information AL to obtain the target backlight value BL _new . For example, the target backlight decision circuit 5361 can obtain the target backlight value BL _new according to the calculation function shown in the formula (6). Where BL _new is the target backlight value, IL is the indoor brightness threshold, AL is the ambient light information, BL _old is the original backlight value in the backlight information BL, and k is the parameter determined according to the design requirements.

It can be inferred from the formula (6) that when the indoor brightness threshold IL is relatively close to the ambient light information AL, the representative target backlight decision circuit 5361 is in an environment of moderate brightness. Therefore, there is not much difference between the target backlight value BL _new and the original backlight value BL _old in the backlight information BL.

The delay circuit 5362 is coupled between the target backlight determining circuit 5361 and the rounding circuit 5363. The delay circuit 5362 can prevent the transition state of the signal from being too frequent. Specifically, when the ambient light is turned from bright to dark, the delay circuit 5362 can delay the signal for a period of time, such as seconds or tens of seconds. In this embodiment, the delay circuit 5362 is configured to delay the change of the target backlight value BL _new . In this way, the repeated change of the instantaneous ambient light information can be avoided, and the control of the gain adjustment circuit 531 and the backlight module 520 by the backlight adjustment circuit 536 is affected, so that the display device does not change due to the instantaneous change of the neglected ambient light information. Light and dark.

FIG. 18 is a schematic diagram of a delay circuit 5362 according to an embodiment of the invention. Schematic diagram of the relationship between ambient light output and backlight output. The horizontal axis in Fig. 18 represents time. When the ambient light output AL_d of the delay circuit 5362 is turned from dark to bright and remains in the bright state, the backlight output BL_d will be delayed for a period of time after TP1. For example, when the ambient light output AL_d is turned from dark to dark, the backlight output BL_d is delayed by 1 second to turn from dark. In addition, when the ambient light output AL_d turns from bright to dark, the backlight output BL_d will delay after a period of time TP2. In this embodiment, the set time TP2 is greater than the time TP1, for example, the time TP2 is 10 seconds and the time TP1 is 2 seconds. The delay circuit 5362 transmits the ambient light output AL_d to the gain decision circuit 531, and transmits the backlight output BL_d to the round circuit 5363.

Smooth flat circuit 5364 to a target backlight BL _new value change, the change of the signal can be made more gentle, and the output value of the second target backlight BL_2 decision circuit 531 to the gain. The present invention does not limit the smoothing of the smoothing circuit 1420. The function and operation of the rounding circuit 5363 of this embodiment are similar to the rounding circuit 3313 shown in FIG. 6. The rounding circuit 5363 can also perform arithmetic or geometric methods to make the signal change relatively smooth. Please refer to the detailed description of FIG. 10 to FIG. 13 , and details are not described herein again. The gain decision circuit 531 can calculate/determine the gain value G of the display material V according to the backlight value BL_2 output by the round circuit 5363 and the relationship between the indoor luminance threshold IL and the ambient light information BL. Therefore, when the display device 50 is under strong ambient light (for example, sunlight), the backlight adjustment circuit 536 can control the gain decision circuit 531 according to the ambient light information AL and the backlight information BL to correspondingly increase the gain value G of the display data V. .

The setting interface 5364 is coupled to the target backlight determining circuit 5361 to provide a human-machine interface for the user to adjust the target backlight value BL _{new of the} target backlight determining circuit 5361. For example, the user can adjust the target backlight value BL _new by adjusting the parameter k in the formula (6).

FIG. 19 is a diagram of a display device 60 in accordance with another embodiment of the present invention. Referring to FIG. 19 , the display device 60 includes a display module 610 , a backlight module 620 , and a data gain adjustment circuit 630 . The display module 610 and the backlight module 620 are similar or similar to the display module 110 and the backlight module 120 shown in FIG. 1 and will not be described again. The data gain adjustment circuit 630 includes a gain determination circuit 631, a data adjustment circuit 632, an upper boundary determination circuit 633, a setting interface 634, a high dynamic range engine 635, a backlight adjustment circuit 636, a debounce circuit 637, a debounce circuit 638, and a remapping circuit. 639.

The operation mode and function of the debounce circuit 637, the debounce circuit 638, and the remapping circuit 639 are similar to those of the debounce circuit 337, the debounce circuit 338, and the remapping circuit 339 shown in FIG. 3. For details, refer to FIG. The description will not be repeated here. Different from the embodiment shown in FIG. 3, the remapping circuit 639 and the debounce circuit 638 of the embodiment are coupled to the backlight adjustment circuit 636. The debounce circuit 638 can clamp the backlight information BL within an acceptable range of variation and provide the clamped backlight information to the backlight adjustment circuit 636. The remapping circuit 639 has a conversion relationship to remap the ambient light information output by the debounce circuit 638 to the new ambient light value and to update the ambient light value to the backlight adjustment circuit 636.

In the embodiment, the backlight adjustment circuit 636 is coupled to the gain determination circuit 631. The backlight adjustment circuit 636 includes a target backlight determination circuit 6361 and a delay circuit. 6362, a smooth circuit 6363, and a setting interface 6364. The gain decision circuit 631 includes a curve index decision circuit 6311, an index to gain conversion circuit 6312, a round slip circuit 6313, and a nonlinear conversion circuit 6314. For details of the gain determination circuit 631 and the data adjustment circuit 632, please refer to the descriptions of the gain determination circuit 331 and the data adjustment circuit 332 in FIGS. 3 and 6. For a detailed description of the backlight adjustment circuit 636, please refer to the description of the backlight adjustment circuit 536 in FIG. 17, and details are not described herein again.

Based on the above description, the data gain circuit of the present invention can be divided into a first gain decision mode and a second gain decision mode according to the manner of gain determination. In addition, the data gain circuit of the present invention can be divided into a first backlight control mode and a second backlight control mode according to the manner of backlight adjustment. In the present embodiment, the display device 60 shown in FIG. 19 should have at least two operation modes, a first operation mode and a second operation mode. When the display device 60 is in the first operation mode, that is, when the data gain adjustment circuit 630 is in the first gain determination mode and the first backlight control mode, the data gain adjustment circuit 630 dynamically adjusts the display data according to the ambient light information AL and the backlight information BL. The gain G of V does not adjust the backlight brightness of the backlight module 620. That is, the display device 60 dynamically adjusts the gain G of the display material V according to the ambient light information AL and the backlight information BL without adjusting the backlight brightness.

In detail, in the first operation mode, the target backlight decision circuit 6361 and the rounding circuit 6363 can be disabled. At this time, the backlight module 620 determines the backlight brightness according to the original backlight information BL. In a state where the target backlight decision circuit 6361 and the rounding circuit 6363 are disabled, the curve index determining circuit 6311 is based on the original backlight information BL and the ambient light information AL provided by the delay circuit 6362. The relationship between the two calculates/determines the index value Inx of the gain, and outputs the index value Inx to the index to the gain conversion circuit 6312. Therefore, the gain determining circuit 110 can adjust the gain value G of the display data V according to the ambient light information AL and the backlight information BL in the first mode without adjusting the backlight brightness of the backlight module 140. When the gain value G of the display material V is higher under strong ambient light (for example, sunlight), it is easier for the user to view the picture details presented by the display module 130.

When the display device 60 is in the second operation mode, that is, when the data gain adjustment circuit 630 is in the second gain determination mode and the second backlight control mode, the display device 60 adjusts the gain G of the display material V and the brightness of the backlight module 610. In the second mode of operation, the target backlight decision circuit 6361 and the rounding circuit 6363 can be enabled. At this time, the target backlight determining circuit 6361 can determine the target backlight value BL _new according to the ambient light information AL and the backlight information BL in the second operation mode, and control the backlight module 620 via the delay circuit 6362 and the smoothing circuit 6363 so as to adjust accordingly. Backlight brightness. In addition, the gain decision circuit 631 can adjust the display according to the backlight value output by the smoothing circuit 6363 (which is responsive to the target backlight value BL _new ) and the ambient light information AL provided by the delay circuit 6362 in the second operation mode. The gain value G of the data V. For example, the backlight adjustment circuit 636 can control the gain determination circuit 631 to adjust the gain G of the display data V correspondingly to the brightness of the backlight, so that the user can view the display module 610 in the strong ambient light. Picture detail.

In summary, the data gain adjustment circuit of the present invention can adjust the gain of the display data according to the ambient light information and the backlight information, and can also be displayed according to the display. Show the data itself to adjust the gain of the displayed data. Accordingly, the display device can adaptively adjust the gain value of the display data according to the environment in which it is located, and even the adjustment of the backlight module can enable the display device of the present invention to more flexibly adjust the display screen of the display data. In this way, the display device of the present invention can have strong light visibility under various ambient light sources, and the user can clearly and comfortably view the picture details even if the user is located in a strong light environment.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧ display device

110‧‧‧ display module

120‧‧‧Backlight module

130‧‧‧Data gain adjustment circuit

AL‧‧‧ Ambient Light Information

BL‧‧‧Backlight Information

V’‧‧‧ Adjusted display data

Claims (38)

A display device includes: a display module; a backlight module providing a backlight to the display module; and a data gain adjustment circuit coupled to the display module, the data gain adjustment circuit according to an ambient light information and A backlight value determines a gain value, and adjusts a display data according to the gain value to obtain an adjusted display data, and transmits the adjusted display data to the display module. The display device of claim 1, wherein the data gain adjustment circuit determines the gain value according to the display data in addition to the ambient light information and the backlight information. The display device of claim 2, wherein the data gain adjustment circuit first determines a "display data to gain relationship" based on the ambient light information and the backlight information, and then according to the display data The gain value is obtained in the "display data to gain relationship" determined. The display device of claim 1, wherein the data gain adjustment circuit correspondingly increases the gain value when the ambient light information indicates that the display device is in a strong ambient light environment; and when the ambient light The information shows that when the display device is in a non-strong ambient light environment, the data gain adjustment circuit correspondingly lowers the gain value. The display device of claim 1, wherein the data gain adjustment circuit first substitutes the backlight information according to the backlight information and the ambient light information The original backlight value of the table is converted into a target backlight value, and then the gain value is adjusted according to the ambient light information and the target backlight value. The display device of claim 5, wherein the data gain adjustment circuit further provides a backlight control signal to the backlight module according to the target backlight value. The display device of claim 1, wherein the data gain adjustment circuit first converts an original backlight value represented by the backlight information into a target backlight value according to the backlight information and the ambient light information, and then A backlight control signal is provided to the backlight module according to the target backlight value. The display device of claim 1, wherein the data gain adjustment circuit is operable to perform at least one of the following gain determination modes: a first gain determination mode: one of the original representations according to the backlight information Adjusting the gain value by the backlight value and the ambient light information, wherein the original backlight value is independent of the ambient light information; and the second gain determining mode: first representing the backlight information according to the backlight information and the ambient light information The original backlight value is converted into a target backlight value, and then the gain value is adjusted according to the target backlight value and the ambient light information, wherein the target backlight value is related to the ambient light information. The display device of claim 1, wherein the data gain adjustment circuit is operable to at least one of a backlight control mode: a first backlight control mode: one of the original representations according to the backlight information a backlight value to provide a backlight control signal to the backlight module, wherein the backlight control signal and the backlight The ambient light information has nothing to do; and the second backlight control mode: first converting the original backlight value represented by the backlight information into a target backlight value according to the backlight information and the ambient light information, and then providing a target backlight value according to the target backlight value The backlight control signal is given to the backlight module, wherein the backlight control signal is related to the ambient light information. The display device of claim 1, wherein the data gain adjustment circuit determines an index value according to the backlight information and the ambient light information, and adjusts the reference index to the gain curve according to the index value. Gain value. The display device of claim 10, wherein the data gain adjustment circuit further generates the index value according to an indoor brightness threshold. The display device of claim 10, wherein the index to gain curve is related to a gamma characteristic parameter of a panel. The display device of claim 10, wherein the data gain adjustment circuit obtains a first gain value after referring to the index to the gain curve, and generates the first gain value according to the display data and the first gain value. Gain value. The display device of claim 13, wherein the data gain adjustment circuit refers to a data to the gain according to the display data in the process of generating the gain value according to the display data and the first gain value. The curve produces a third gain value as the gain value, wherein the data to gain curve is generated based on the first gain value and a normalized data to gain curve. The display device of claim 13, wherein the data gain adjustment circuit performs the first gain value after obtaining a first gain value. a smoothing process to generate a second gain value, and then referencing a data to the gain curve according to the display data to generate a third gain value as the gain value, wherein the data to gain curve is based on the second gain value and a The normalized data is generated by the gain curve. A data gain adjustment circuit for a display device includes: a gain determination circuit for determining a gain value according to backlight information and ambient light information; and a data adjustment circuit coupled to the gain determination circuit for receiving a display data And according to the gain value, correspondingly adjusting the display data to obtain an adjusted display data. The data gain adjustment circuit of claim 16, wherein the data gain adjustment circuit determines the gain value according to the display data in addition to the ambient light information and the backlight information. The data gain adjustment circuit of claim 17 , wherein the data gain adjustment circuit first determines a “display data to gain relationship” according to the ambient light information and the backlight information, and then according to the display data. The gain value is obtained from the determined relationship of "display data to gain". The data gain adjustment circuit of claim 16, wherein the data adjustment circuit is implemented as a multiplication circuit. The data gain adjustment circuit of claim 16, wherein the gain determination circuit comprises: a curve index determining circuit, determining an index value according to the backlight information and the ambient light information; An index-to-gain conversion circuit is coupled to the curve index determining circuit, and adjusts a first gain value of the display data according to the index value by referring to an index to a gain curve, wherein the gain determining circuit is based on the first Adjust the gain value by the gain value. The data gain adjustment circuit of claim 20, wherein the curve index determining circuit further determines the index value according to an indoor brightness threshold. The data gain adjustment circuit of claim 20, wherein the index to gain curve is related to a gamma characteristic parameter of a panel. The data gain adjustment circuit of claim 20, wherein the gain determination circuit further comprises: a nonlinear conversion circuit coupled between the index to the gain conversion circuit and the data adjustment circuit, the nonlinear conversion circuit And determining, according to the display data, a data to the gain curve to generate a third gain value as the gain value, wherein the data to gain curve is generated according to the first gain value and a normalized data to the gain curve. The data gain adjustment circuit of claim 20, wherein the gain determining circuit further comprises: a rounding circuit coupled to the index to the gain conversion circuit, the rounding circuit making the change of the first gain value relatively gentle And generating a second gain value; and a non-linear conversion circuit coupled between the round circuit and the data adjustment circuit, the nonlinear conversion circuit refers to a data to the gain curve according to the display data to generate a third The gain value is used as the gain value, wherein the data to the gain curve is rooted The second gain value is generated from a normalized data to a gain curve. The data gain adjustment circuit of claim 23, further comprising: a setting interface; and an upper boundary determining circuit coupled to the nonlinear conversion circuit and the setting interface, wherein the upper boundary determining circuit is configured according to the setting interface The nonlinear conversion circuit is controlled to adjust a curve boundary of the third gain value. The data gain adjustment circuit of claim 23, further comprising: a high dynamic range engine; and an upper boundary determining circuit coupled to the nonlinear conversion circuit and the high dynamic range engine, wherein the upper boundary is determined The circuit controls the non-linear conversion circuit according to the operation result of the high dynamic range engine to dynamically adjust the curve boundary of the third gain value. The data gain adjustment circuit of claim 16, further comprising: at least one of the following circuits: a first debounce circuit, receiving the ambient light information, and clamping the ambient light information to a first variation range a second debounce circuit that receives the backlight information and clamps the backlight information into a second variation range; and a remapping circuit having a conversion relationship to remap the ambient light information to a new environment Light value, and the new ambient light value is provided to the gain decision Circuit. The data gain adjustment circuit of claim 16 further includes a backlight adjustment circuit coupled to the gain determination circuit, and controlling the gain determination circuit to adjust the display data according to the ambient light information and the backlight information. The gain value. The data gain adjustment circuit of claim 28, wherein the backlight adjustment circuit further outputs a backlight control signal according to the ambient light information and the backlight information, wherein the backlight control signal is used to control dynamic adjustment of a backlight module. A backlight brightness. The data gain adjustment circuit of claim 28, wherein the backlight adjustment circuit comprises: a target backlight determination circuit, according to the ambient light information and the backlight information, the original backlight represented by the backlight information The value is converted to a target backlight value, so that the gain determining circuit adjusts the gain value of the display data according to the target backlight value and the ambient light information. The data gain adjustment circuit of claim 30, wherein the backlight adjustment circuit further comprises at least one of the following circuits, coupled between the target backlight determination circuit and the gain determination circuit: a delay circuit, The method for delaying the change of the target backlight value; and a rounding circuit for smoothing the change of the target backlight value. The data gain adjustment circuit of claim 30, wherein the backlight adjustment circuit further comprises: A setting interface is coupled to the target backlight determining circuit to provide a human interface for the user to adjust the target backlight value of the target backlight determining circuit. The data gain adjustment circuit of claim 28, wherein the data gain adjustment circuit is operable to at least one of a gain determination mode: a first gain determination mode: the backlight adjustment circuit backlights The original backlight value represented by the information and the ambient light information are provided to the gain determining circuit, so that the gain determining circuit adjusts the gain value according to the original backlight value and the ambient light information, wherein the original backlight value and the ambient light The information is irrelevant; and the second gain determining mode: the backlight adjusting circuit first converts the original backlight value represented by the backlight information into a target backlight value according to the backlight information and the ambient light information, and the target backlight value is The ambient light information is provided to the gain determining circuit, so that the gain determining circuit adjusts the gain value according to the target backlight value and the ambient light information, wherein the target backlight value is related to the ambient light information. The data gain adjustment circuit of claim 28, wherein the data gain adjustment circuit is operable to at least one of a backlight control mode: a first backlight control mode: the backlight adjustment circuit is based on the backlight The information represents one of the original backlight values to provide a backlight control signal to the backlight module, wherein the backlight control signal is independent of the ambient light information; and a second backlight control mode: the backlight adjustment circuit firstly depends on the backlight information Ambient light information and convert one of the original backlight values represented by the backlight information into a target The backlight value is used to provide a backlight control signal to the backlight module according to the target backlight value, wherein the backlight control signal is related to the ambient light information. A data gain adjustment method for a display device includes: determining a gain value according to backlight information and ambient light information; and receiving a display data, and adjusting the display data according to the gain value to obtain an adjusted display data . The data gain adjustment method according to claim 35, wherein the step of determining the gain value determines the gain value according to the display data, in addition to the ambient light information and the backlight information. The data gain adjustment method according to claim 36, wherein in the step of determining the gain value, first determining a relationship of displaying data to gain according to the ambient light information and the backlight information, and then The display data is obtained from the determined relationship of "display data to gain". The data gain adjustment method according to claim 35, wherein when the ambient light information indicates that the display device is in a strong ambient light environment, the gain value is correspondingly increased: and when the ambient light information is displayed When the display device is in a non-strong ambient light environment, the gain value is correspondingly lowered.