CN112530355A

CN112530355A - Display device and control method

Info

Publication number: CN112530355A
Application number: CN202011607052.7A
Authority: CN
Inventors: 诸葛慧; 郑胜文
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2020-08-24
Filing date: 2020-12-30
Publication date: 2021-03-19
Anticipated expiration: 2040-12-30
Also published as: TWI754358B; TW202209298A; CN112530355B

Abstract

A display device and a control method are provided, the display device comprises a first panel and a second panel. The second panel is located below the first panel. The gamma value of the first panel is higher than that of the second panel, and the gamma curve of the first panel is discontinuous.

Description

Display device and control method

Technical Field

Embodiments described in the present disclosure relate to a display device and a control method thereof, and more particularly, to a display device with a dual-layer panel and a control method thereof.

Background

The double-layer display is used by overlapping two screens, the lower layer adopts a black and white unit, the upper layer adopts a double-layer design of a color unit, and the bright part and the dark part of the image can be brighter and darker by matching a high-contrast image processing algorithm, so that the ultrahigh contrast is realized. Due to the high contrast characteristic, the dual-layer display can be applied to televisions, and also can be popularized to the fields of instrument displays for vehicles and medical displays, in order to reduce the cost, the lower-layer display can adopt a twisted nematic panel, but the twisted nematic panel has the problem of color level inversion at a large viewing angle, and the situation of color error display and even color inversion at the large viewing angle after the upper-layer panel is matched is caused.

Disclosure of Invention

Some embodiments of the present disclosure relate to a display device. The display device comprises a first panel and a second panel. The second panel is located below the first panel. The gamma value of the first panel is higher than that of the second panel, and the gamma curve of the first panel is discontinuous.

Some embodiments of the present disclosure relate to a control method for a display device including a first panel and a second panel, the second panel being located below the first panel, the control method including: adjusting by the processor to make the gamma value of the first panel higher than that of the second panel, wherein the gamma value of the first panel is not continuous with the first threshold value; and adjusting by the processor, when the input gray-scale value of the input signal input to the second panel is lower than the second threshold value, the processor applies the first matrix (matrix) and the first shift (shift) to the input signal; when the input gray scale value is not lower than a second threshold value, the processor applies a second matrix and a second offset to the input signal, wherein the second threshold value corresponds to the first threshold value.

In summary, the display device and the control method of the present disclosure can achieve no tone reversal in either the positive or large viewing angle tone.

Drawings

In order to make the aforementioned and other objects, features, advantages and embodiments of the disclosure more comprehensible, the following description is given:

FIG. 1 is a schematic diagram of a display device shown in accordance with some embodiments of the present disclosure;

FIG. 2 is a schematic diagram of a gamma curve shown in accordance with some embodiments of the present disclosure;

FIG. 3 is a schematic diagram of a gamma curve shown in accordance with some embodiments of the present disclosure; and

fig. 4 is a flow chart illustrating a control method according to some embodiments of the present disclosure.

Description of reference numerals:

100: display device

110A, 110B: panel board

130: processor with a memory having a plurality of memory cells

200: gamma curve

300: gamma curve

Γ 1, Γ 2: detection circuit

400: control method

S410, S430: step (ii) of

Detailed Description

The term "coupled", as used herein, may also mean "electrically coupled", and the term "connected", as used herein, may also mean "electrically connected". "coupled" and "connected" may also mean that two or more elements co-operate or interact with each other.

Please refer to fig. 1. Fig. 1 is a schematic diagram of a display device 100 shown in accordance with some embodiments of the present disclosure.

Taking the example of fig. 1 as an example, the display device 100 includes

panels

110A and 110B and a processor 130. In this connection, processor 130 is coupled to panel 110A and panel 110B. Panel 110B is located below panel 110A. In some embodiments, the resolution of the panel 110B is less than that of the panel 110A. The configuration of the display device 100 described above is for exemplary purposes only, and embodiments of the present disclosure are not limited thereto.

In some embodiments, the gamma value of the panel 110A is higher than the gamma value of the panel 110B, and the gamma curve of the panel 110A is discontinuous.

Please refer to fig. 2. Fig. 2 is a schematic diagram of a gamma curve 200 shown in accordance with some embodiments of the present disclosure. The gamma curve 200 shown in FIG. 2 is suitable for the panel 110A as depicted in FIG. 1. As can be seen from fig. 2, the gamma curve 200 includes discontinuities, as indicated by the dashed circles.

As shown in FIG. 2, the gray-scale sections below the threshold TH1 correspond to gamma-sub-values Γ 1, and the gray-scale sections below the threshold TH1 correspond to gamma-sub-values Γ 2. In some embodiments, the gamma-sub-value Γ 1 is lower than the gamma-sub-value Γ 2.

In some embodiments, when images are to be input to the

panels

110A and 110B, the input signal input to the panel 110A is directly output to the panel 110A, and the input signal input to the panel 110B is adjusted by the processor 130 and then output to the panel 110B.

Specifically, the input signal to the panel 110B is first subjected to gray-scale conversion and signal amplification. Then, when the input gray-scale value of the input signal to the panel 110B is lower than the threshold TH2, the processor 130 applies the first matrix and the first offset to the input signal; the processor applies the second matrix and the second offset to the input signal when the input gray scale value is not less than the threshold value TH 2. In some embodiments, the first matrix is smaller than the second matrix.

Next, the processor 130 performs a divide operation, with larger divides being darker in color. After the value division operation, the processor 130 performs a degamma conversion and outputs a signal to the panel 110B. In some embodiments, when the input gray level is lower than the threshold TH2, the processor 130 decreases the division value when performing the division operation; when the input gray level is not lower than the threshold TH2, the processor 130 increases the division value when performing the division operation.

In some embodiments, the threshold TH1 and the threshold TH2 correspond to each other and are close to each other. In some embodiments, the threshold TH1 and the threshold TH2 are set by the processor 130.

Please refer to fig. 3. Fig. 3 is a schematic diagram of a gamma curve 300 shown in accordance with some embodiments of the present disclosure. The gamma curve 300 shown in FIG. 3 is suitable for the panel 110B as depicted in FIG. 1. In some embodiments, the gamma value in fig. 3 is 0.1, but the embodiments of the disclosure are not limited thereto.

In some embodiments, the gamma value of the panel 110A is greater than 2, and the gamma value of the panel 110B is less than 0.2.

In some embodiments, the display device 100 shown in fig. 1 further includes a gate driving circuit (not shown), a source driving circuit (not shown), and the like, wherein the gate driving circuit and the source driving circuit are respectively coupled to the

panels

110A and 110B.

Please refer to fig. 4. Fig. 4 is a flow chart illustrating a control method 400 in accordance with some embodiments of the present disclosure. The control method 400 includes steps S410 and S430. In some embodiments, the control method 400 is applied to the display device 100 of fig. 1, but the disclosure is not limited thereto. For ease of understanding, the control method 400 will be discussed in conjunction with the display device 100 of FIG. 1.

In step S410, the processor adjusts the gamma value of the first panel to be higher than the gamma value of the second panel, wherein the gamma value of the first panel is not continuous with the first threshold.

For example, the processor 130 in fig. 1 adjusts the gamma value of the panel 110A to be higher than the gamma value of the panel 110B, wherein the gamma value of the panel 110A is not continuous with the threshold value TH 1.

In step S430, performing an adjustment by the processor, when the input gray-scale value of the input signal input to the second panel is lower than the second threshold, the processor applying the first matrix and the first offset to the input signal; when the input gray scale value is not lower than a second threshold value, the processor applies a second matrix and a second offset to the input signal, wherein the second threshold value corresponds to the first threshold value.

For example, the processor 130 in fig. 1 adjusts that when the input gray-scale value of the input signal input to the panel 110B is lower than the threshold TH2, the processor 130 applies the first matrix and the first offset to the input signal; when the input gray level is not less than the threshold TH2, the processor 130 applies the second matrix and the second offset to the input signal. The threshold TH2 corresponds to the threshold TH 1.

In summary, the display device and the control method of the present disclosure can adjust the image by an algorithm and adjust the panel gamma value, so as to avoid the situation that the lower panel is matched with the upper panel and then has color errors at different viewing angles, and ensure that no matter the viewing angle is the positive or the large viewing angle, there is no tone inversion.

In some embodiments, the processor 130 may be a Central Processing Unit (CPU), a control Unit (control Unit), a micro processor (micro processor), or other hardware components capable of executing instructions. The modules of the processing element may be implemented as program code, and the program code may be stored in the memory element. Therefore, after the processing element reads and executes the program codes in the storage element, the corresponding functions of each module are provided.

In some embodiments, the

panels

110A and 110B may be display panels with image display functions or circuits with the same or similar functions.

Although the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the disclosure, and therefore, the scope of the disclosure should be limited only by the appended claims.

Claims

1. A display device, comprising:

a first panel; and

a second panel under the first panel, wherein a gamma value of the first panel is higher than that of the second panel, and a gamma curve of the first panel is discontinuous.

2. The display apparatus of claim 1, wherein the gamma curve of the first panel corresponds to a first sub-gamma value in a first gray scale section and a second sub-gamma value in a second gray scale section.

3. The display device of claim 2, wherein the first gray scale section is below a first threshold, the second gray scale section is not below the first threshold, and the first sub-gamma value is less than the second sub-gamma value.

4. The display device of claim 3, further comprising:

a processor coupled to the second panel, wherein the processor applies a first matrix and a first offset to an input signal when an input gray level of the input signal is lower than a second threshold; when the input gray level is not lower than the second threshold, the processor applies a second matrix and a second offset to the input signal, wherein the second threshold corresponds to the first threshold.

5. The display device of claim 4, wherein the first matrix is smaller than the second matrix.

6. The display apparatus of claim 4, wherein the processor is further configured to set the first threshold and the second threshold.

7. The display apparatus according to claim 4, wherein the processor is further configured to decrease a divide value when the input gray level is below the second threshold; the processor is further configured to increase the division value when the input gray level is not lower than the second threshold.

8. The display apparatus of claim 1, wherein the gamma value of the first panel is greater than 2 and the gamma value of the second panel is less than 0.2.

9. The display device of claim 1, wherein a resolution of the second panel is less than a resolution of the first panel.

10. A control method is suitable for a display device comprising a first panel and a second panel, wherein the second panel is positioned below the first panel, and the control method comprises the following steps:

adjusting by a processor to make a gamma value of the first panel higher than a gamma value of the second panel, wherein the gamma value of the first panel is not continuous with a first threshold value; and

adjusting by a processor, when an input gray-scale value of an input signal input to the second panel is lower than a second threshold value, the processor applying a first matrix and a first offset to the input signal; when the input gray level is not lower than the second threshold, the processor applies a second matrix and a second offset to the input signal, wherein the second threshold corresponds to the first threshold.