Display device

A display device includes a display panel, a light source module and a control unit. The display panel includes plural display areas. The light source module includes plural light source units. The light source units are configured to output plural light beams to illuminate the display areas of the display panel. The control unit is coupled to the light source module and configured to receive a frame data. The frame data includes plural subframe data, and the subframe data are displayed on the display areas. The control unit is further configured to control a first light source unit of the light source units to adjust a brightness corresponding to a first color of a first light beam of the light beams according to a ratio of the first color. The ratio of the first color is related to a first subframe data of the subframe data.

RELATED APPLICATIONS

This application claims priority to Chinese Application Serial Number 201710828767.7, filed Sep. 14, 2017, which is herein incorporated by reference.

BACKGROUND

Technical Field

The present disclosure relates to display technology. More particularly, the present disclosure relates to a display device.

Description of Related Art

In general, a light source of a reflective display outputs white light, and can only adjust brightness. However, in a situation of displaying color image, color saturation of display is therefore limited so that it is difficult to display frame with high color saturation.

SUMMARY

An aspect of the present disclosure is to provide a display device that includes a display panel, a light source module and a control unit. The display panel includes a plurality of display areas. The light source module includes a plurality of light source units. The light source units are configured to output a plurality of light beams to illuminate the display areas of the display panel. The control unit is coupled to the light source module and configured to receive a frame data. The frame data includes a plurality of subframe data. The subframe data are displayed on the display areas. The control unit is further configured to control a first light source unit of the light source units to adjust a brightness corresponding to a first color of a first light beam of the light beams according to a ratio of the first color. The ratio of the first color is related to a first subframe data of the subframe data.

In an embodiment, the control unit is further configured to control the first light source unit to increase the brightness corresponding to the first color of the first light beam when the control unit determines that the ratio of the first color of the first subframe data is larger than a threshold.

In an embodiment, the control unit is further configured to control a second light source unit of the light source units to adjust a total brightness of a second light beam of the light beams according to a ratio of the second color, and the ratio of the second color is related to a second subframe data of the subframe data.

In an embodiment, the control unit is further configured to control the second light source unit to reduce the total brightness of the second light beam when the control unit determines that the ratio of the second color of the second subframe data is larger than a threshold.

In an embodiment, the first light source unit comprises a red-green-blue (RGB) light emitting diode (LED). The control unit is further configured to control the RGB LED of the first light source unit to adjust the brightness corresponding to the first color of the first light beam according to the ratio of the first color of the first subframe data.

In an embodiment, the display device further includes a projection unit. The projection unit is configured to project the light beams outputted by the light source units on the display areas of the display panel.

Another aspect of the present disclosure is to provide a display device that includes a light guide, a light source module and a control unit. The light source module is configured to output a light beam to illuminate the light guide. The control unit is coupled to the light source module and configured to receive a frame data, and to control the light source module to adjust a brightness corresponding to a first color of the light beam according to a ratio of the first color, wherein the ratio of the first color is related to the frame data.

In an embodiment, the control unit is further configured to control the light source module to increase the brightness corresponding to the first color of the light beam when the control unit determines that the ratio of the first color of the frame data is larger than a threshold.

In an embodiment, the light source module comprises a red-green-blue (RGB) light emitting diode (LED), and the control unit is further configured to control the RGB LED of the light source module to adjust the brightness corresponding to the first color of the light beam according to the ratio of the first color of the frame data.

In an embodiment, the display device further includes a first adhesivelayer and a second adhesivelayer. The light guide is disposed between the first adhesivelayer and the second adhesive layer, and the refractive index of the light guide is larger than the refractive index of the first adhesive layer and the refractive index of the second adhesive layer.

In sum, the control unit can adjust a brightness corresponding to a color of the light beam outputted by the light source module according to a ratio of a color of the frame data, and therefore color saturation of the frame data is effectively improved.

DETAILED DESCRIPTION

In order to make the description of the disclosure more detailed and comprehensive, reference will now be made in detail to the accompanying drawings and the following embodiments. However, the provided embodiments are not used to limit the ranges covered by the present disclosure; orders of step description are not used to limit the execution sequence either. Any devices with equivalent effect through rearrangement are also covered by the present disclosure.

Unless otherwise indicated, all numbers expressing quantities, conditions, and the like in the instant disclosure and claims are to be understood as modified in all instances by the term “about.” The term “about” refers, for example, to numerical values covering a range of plus or minus 20% of the numerical value. The term “about” preferably refers to numerical values covering range of plus or minus 10% (or most preferably, 5%) of the numerical value. The modifier “about” used in combination with a quantity is inclusive of the stated value.

In this document, the term “coupled” may also be termed as “electrically coupled,” and the term “connected” may be termed as “electrically connected.” “Coupled” and “connected” may also be used to indicate that two or more elements cooperate or interact with each other.

Reference is made toFIG. 1andFIG. 2.FIG. 1is a schematic diagram of a display device100according to an embodiment of the present disclosure.FIG. 2is a schematic diagram of a light source module110of a display device100according to an embodiment of the present disclosure. The display device100includes a light source module110, a display panel120and a control unit130. The display panel120includes plural display areas A1-A16. The light source module110includes plural light source units L1-L16. The light source unit L1-L16is configured to output plural light beams to illuminate the display area A1-A16of the display panel120. The control unit130is coupled to the light source module110and configured to receive frame data. The frame data includes a plurality of subframe data, and the plurality of subframe data are respectively displayed on the display areas A1-A16.

In one embodiment, the light source units L1-L16respectively illuminate the display areas A1-A16. For example, a light beam outputted by the light source unit L1illuminates the display area A1, a light beam outputted by the light source unit L2illuminates the display area A2, . . . a light beam outputted by the light source unit L16illuminates the display area A16. It should be noted that number and arrangement of the display areas A1-A16inFIG. 1are merely for example, and other arrangements of the display areas A1-A16are also within the scope of the present disclosure. However, the present disclosure is not limited herein.

In one embodiment, the light source units L1-L16include a red-green-blue (RGB) light emitting diode (LED). In another embodiment, the light source units L1-L16may include a RGB LED and a white LED.

In one embodiment, the frame data may be color frame data. The control unit130is configured to control a first light source unit of the light source units L1-L16to adjust a brightness corresponding to the first color of a first light beam of the light beams according to a ratio of the first color. The ratio of the first color is related to first subframe data of plural subframe data. For example, the control unit130controls the light source unit L1to adjust a brightness corresponding to red color of a light beam illuminated to the display area A1according to a ratio of red color of subframe data displayed on the display area A1.

In one embodiment, when the control unit130determines that the ratio of red color of the subframe data displayed on the display area A1is larger than a threshold (designed according to actual demand), the control unit130controls the light source unit L1to increase the brightness corresponding to red color of the light beam illuminated to the display area A1. Reference is made toFIG. 5andFIG. 1, light beams of the light source module110illuminated the display panel120are shown, before adjustment, a brightness R of red color, a brightness G of green color, a brightness B of blue color, and a brightness W of white color are shown by solid lines, and a brightness R of red color increased by the light source unit L1that is controlled by the control unit130is shown by dashed lines. When the control unit130determines that the ratio of red color of the subframe data (not shown) displayed on the display area A1is higher, the brightness R of red color of the light beam illuminated the display area A1by the light source unit L1is also increased, and therefore color saturation of the display area A1is effectively improved.

It should be noted that the control unit130may detect ratios of plural colors (e.g., red color, green color, blue color, however, the present disclosure is not limited herein) of the plural subframe data displayed on the display areas A1-A16to control the light source units L1-L12to adjust plural brightness corresponding to the colors (e.g., red color, green color, blue color, however, the present disclosure is not limited herein) of the light beams. For example, when the control unit130determines that a ratio of green color of subframe data displayed on the display area A3is larger than a threshold (designed according to actual demand), the control unit130controls the light source unit L3to increase a brightness corresponding to green color of the light beam illuminated the display area A3. For another example, when the control unit130determines that a ratio of blue color of subframe data displayed in the display area A5is larger than a threshold (designed according to actual demand), the control unit130controls the light source unit L5to increase a brightness corresponding to blue color of light beam illuminated the display area A5. Similarly, the control unit130controls each of the light source units L1-L12to adjust the brightness corresponding to the colors (e.g., red color, green color, blue color, however, the present disclosure is not limited herein) of the output light beams according to the ratios of the plural colors (e.g., red color, green color, blue color, however, the present disclosure is not limited herein) of the plural subframe data displayed on the display areas A1-A16.

As a result, the control unit130may control the light source units L1-L16to respectively adjust the brightness of the output light beams to improve color saturation of the subframe data displayed on the display areas A1-A16, and therefore display quality is effectively improved.

In another embodiment, the frame data may be gray-level frame data. The control unit130is further configured to control a second light source unit of the light source units L1-L16to adjust a total brightness of a second light beam of the light beams according to a ratio of a second color. The ratio of the second color is related to second subframe data of the plural subframe data. For example, the control unit130controls the light source unit L2to adjust a total brightness of a light beam illuminated the display area A2according to a ratio of black color of subframe data displayed on the display area A2.

In one embodiment, when the control unit130determines that the ratio of black color of the subframe data displayed on the display area A2is larger than a threshold (designed according to actual demand), the control unit130controls the light source unit L2to reduce a total brightness (e.g., brightnesses of red color, green color, blue color and white color) of a light beam illuminated the display area A2. When the subframe data with higher ratio of black color is displayed on the display area A2, the total brightness of the light beam illuminated the display area A2by the light source unit L2are all reduced. Similarly, the control unit130controls each of the light source units L1-L16to adjust total brightness of the output light beams according to a ratio of black color of each of the plural subframe data displayed on the display areas A1-A16, and therefore contrast of the display areas A1-A16is effectively improved.

In one embodiment, the display device100further includes a projection unit140. The projection unit140is configured to project the light beams outputted by the light source units L1-L16to the display areas A1-A16of the display panel120. For example, the projection unit140is configured to project the outputted by the light source unit L1to the display area A1, to project the light beam outputted by the light source unit L2to the display area A2, . . . to project the light beam outputted by the light source unit L16to the display area A16. It should be noted that arrangement of the display areas A1-A16inFIG. 1is only for example, other arrangements of the display areas A1-A16are also within the scope of the present disclosure. The projection unit140may project the light beams outputted by the light source units L1-L16to the display areas A1-A16with different arrangements.

Reference is made toFIG. 3.FIG. 3is a schematic diagram of a display device300according to an embodiment of the present disclosure. The display device300includes a light source module310, a light guide (LGP)320and a control unit330. The light source module310is configured to output a light beam to illuminate the light guide320. The control unit330is coupled to the light source module310.

In one embodiment, frame data may be color frame data. The control unit330is configured to receive the frame data, and to control the light source module310to adjust a brightness corresponding to a first color of the light beam according to a ratio of a first color. The ratio of the first color is related to the frame data. For example, the control unit330controls the light source module310to adjust a brightness corresponding to red color of the light beam according to a ratio of red color of the frame data.

In one embodiment, when the control unit330determines that the ratio of red color of the frame data is larger than a threshold (designed according to actual demand), the control unit330controls the light source module310to increase the brightness corresponding to red color of the light beam illuminated the light guide320. Reference is made toFIG. 5, before adjustment, a brightness R of red color, a brightness G of green color, a brightness B of blue color and a brightness W of white color are shown in solid lines, and a brightness R of red color increased by the light source unit310that is controlled by the control unit330is shown by dashed lines. When the control unit330determines that the ratio of red color of the frame data (not shown) is higher, the brightness R of red color of the light beam illuminated the light guide320by the light source module310is also increased, and therefore color saturation is effectively improved. It should be noted that when the control unit330determines that a ratio of another color (e.g., green color, blue color) of the frame data is larger than a threshold (designed according to actual demand), the control unit330controls the light source module310to increase a brightness of the other color (e.g., green color, blue color) of light beam illuminated the light guide320.

As a result, the control unit330may control the light source module310to adjust the brightness of the output light beam to improve color saturation of the frame data, and therefore display quality is effectively improved.

In one embodiment, the light source module310includes RGB LEDs312,314and white LEDs311,313and315. In another embodiment, the light source module310includes a RGB LED. The control unit330is further configured to control a first color LED of the light source module310to adjust a brightness corresponding to the first color of the light beam illuminated the light guide320according to a ratio of first color of the frame data. For example, the control unit330is further configured to control the RGB LEDs312,314of the light source module310to adjust a brightness corresponding to red color of the light beam illuminated the light guide320according to a ratio of red color of the frame data.

In one embodiment, as shown inFIG. 4, the light guide320is disposed between an adhesive layer410and an adhesive layer420. The refractive index of the light guide320is larger than the refractive index of the adhesive layer411, and the refractive index of the light guide320is larger than the refractive index of the adhesive layer412. In one embodiment, the adhesive layer411and the adhesive layer412are optical clear adhesive (OCA), and an AG film, a cover plate or a touch panel may be laminated on the adhesive layer411. In another display device, only the bottom adhesive layer412is connected to a reflective display, a cover plate (or a touch panel) is disposed on a light guide, and an air layer is between the light guide and the cover plate (or the touch panel).

In practice, the control units130and330may be circuits.

In sum, the control units130and330can adjust the brightness corresponding to colors of the light beams outputted by the light source module110and310according to the ratios of the colors of the frame data, and therefore color saturation of the frame data is effectively improved.