Pixel color correction method and display pixel using same

Abstract

A display pixel of the present invention comprises: a driving circuit that receives an input pulse-width modulation signal (PWM_IN) and outputs an output pulse-width modulation signal (PWM_OUT); a control circuit that receives a signal voltage (Vset) and outputs a driving voltage (Vdv); a first transistor that receives the output pulse-width modulation signal (PWM_OUT) from the driving circuit and performs a switching operation; a second transistor that receives the driving voltage (Vdv) from the control circuit and performs a switching operation; and an LED that is driven on the basis of the driving voltage (Vdv).

Description

Pixel color correction method and display pixels using the same

[0001] The present invention is applicable to all technologies directly or indirectly related to display pixels, and, for example, relates to a display pixel that controls the current applied to the pixel of a display panel.

[0002] Virtual Reality (VR) refers to a specific environment or situation, or the technology itself, created using artificial technology such as computers that is similar to reality but is not actually real.

[0003] Augmented Reality (AR) refers to a technology that superimposes virtual objects or information onto a real environment to make them appear as if they exist in the original environment.

[0004] Mixed Reality (MR) or Hybrid Reality refers to the creation of new environments or new information by combining the virtual world and the real world. In particular, it is called Mixed Reality when referring to the ability to interact in real time between things existing in the real world and the virtual world.

[0005] At this time, the created virtual environment or situation stimulates the user's five senses and enables spatial and temporal experiences similar to reality, thereby allowing the user to freely cross the boundary between reality and imagination. Furthermore, the user can not only simply immerse themselves in this environment but also interact with the elements implemented within it, such as by using actual devices to perform operations or issue commands.

[0006] Recently, active research is being conducted on the equipment (gear) used in these technology fields.

[0007] AR glasses, which are the equipment used, emit holographic images using diffraction waveguide lens technology. However, diffraction waveguide lenses have a problem with color uniformity, so to solve this, pixel color correction technology in display panels is being developed.

[0008] Conventional pixel color correction techniques in panels utilized a method of converting screen grayscale data, but this had issues such as a reduction in the grayscale expression range for color modulation based on screen position.

[0009] To solve the problems described above, the present invention aims to provide a pixel color correction method that implements a pixel color correction function by adjusting the current operating range of a pixel driving circuit.

[0010] The problems of the present invention are not limited to those described above. Other problems not described above will be understood by a person skilled in the art from the description of the present invention below.

[0011] A display pixel according to any one embodiment of the present invention for solving the problem described above comprises: a driving circuit that receives an input pulse width modulation signal (PWM_IN) and outputs an output pulse width modulation signal (PWM_OUT); a control circuit that receives a signal voltage (Vset) and outputs a driving voltage (Vdv); a first transistor that receives the output pulse width modulation signal (PWM_OUT) of the driving circuit and performs a switching operation; a second transistor that receives the driving voltage (Vdv) of the control circuit and performs a switching operation; and an LED driven based on the driving voltage (Vdv).

[0012] According to an embodiment, the first transistor, the second transistor, and the LED are connected in series.

[0013] According to an embodiment, the first transistor and the second transistor may be MOS transistors.

[0014] According to an embodiment, the gate of the first transistor is connected to the driving circuit, the gate of the second transistor is connected to the control circuit, and the source of the first transistor is connected to the drain of the second transistor.

[0015] According to an embodiment, the control circuit changes the driving voltage to change the current flowing through the second transistor and modulates the maximum value of the current applied to the LED.

[0016] According to an embodiment, the LED is one of a red LED, a green LED, or a blue LED.

[0017] According to an embodiment, the control circuit controls the driving voltage in response to the signal voltage received corresponding to each LED.

[0018] A display pixel according to one embodiment of the present invention can minimize the reduction of the color expression range by adjusting the current operating range of each pixel driving circuit.

[0019] The effects of the present invention are not limited to those described above. Other effects not described above may be understood by a person skilled in the art from the description of the present invention below.

[0020] FIG. 1 is a drawing for explaining a display pixel according to any one of the embodiments of the present invention.

[0021] FIG. 2 is a diagram showing the relationship between an input signal and an output signal of a driving circuit according to one embodiment of the present invention.

[0022] FIG. 3 is a flowchart illustrating a pixel color correction method according to an embodiment of the present invention.

[0023] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions could obscure the essence of the present invention, such detailed description is omitted.

[0024] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the present invention. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by such terms. Throughout the specification, when a part is described as 'comprising' or 'equipped' with a certain component, unless specifically stated otherwise, this means that it may include additional components rather than excluding other components. Furthermore, terms such as '…part', 'module,' etc., as described in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware, software, or a combination of hardware and software.

[0025] The description of the invention disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the invention and is not intended to represent the only embodiment in which the invention may be practiced.

[0026] FIG. 1 is a drawing for explaining a display pixel according to any one of the embodiments of the present invention.

[0027] Referring to FIG. 1, the display pixel may include a driving circuit (110), a control circuit (120), a first transistor (130), a second transistor (140), and an LED (Light Emitting Diode, 150).

[0028] The driving circuit (110) can receive a pulse width modulation signal as an input signal (PWM_IN). The driving circuit (110) can generate an output signal (PWM_OUT) based on the input signal (PWM_IN). At this time, the output signal (PWM_OUT) based on the driving circuit (110) may be a pulse width modulation signal. The output signal (PWM_OUT) of the driving circuit (110) may correspond to the input signal (PWM_IN).

[0029] The driving circuit (110) can apply an output signal (PWM_OUT) as the gate voltage of the first transistor (130).

[0030] FIG. 2 is a diagram showing the relationship between an input signal and an output signal of a driving circuit (110) according to an embodiment of the present invention. As shown in FIG. 2, the output signal (PWM_OUT) may have the same duty cycle and frequency as the duty cycle and frequency of the input signal (PWM_IN).

[0031] The driving circuit (110) can output an output signal (PWM_OUT) having a second amplitude (W2) based on an input signal (PWM_IN) having a first amplitude (W1).

[0032] In this case, the maximum value of the output signal (PWM_OUT) may be lower than the maximum value of the input signal (PWM_IN).

[0033] For example, the maximum value of the output signal (PWM_OUT) may be equal to the operating voltage (Vdd). If the voltage of the input signal (PWM_IN) of the driving circuit (110) increases, the voltage of the output signal (PWM_OUT) also increases, and if the input signal (PWM_IN) decreases, the voltage of the output signal may decrease.

[0034] Also, the duty cycle of the output signal (PWM_OUT) can be adjusted by controlling the duty cycle of the input signal (PWM_IN).

[0035] Referring again to FIG. 1, the control circuit (120) can receive a set voltage (Vset) for driving the LED.

[0036] The control circuit (120) can generate a control voltage (Vdv) based on a set voltage (Vset). The control circuit (120) can apply the control voltage (Vdv) as the gate voltage of the second transistor (140). The control voltage (Vdv) of the control circuit (120) can correspond to the set voltage (Vset).

[0037] The first transistor (130) may be a first driving transistor of a display pixel. The first transistor (130) may be a MOS transistor. The gate of the first transistor (130) may be connected to a driving circuit (110), the drain of the first transistor (130) may be connected to an LED (150), and the source of the first transistor (130) may be connected to a second transistor (140).

[0038] The second transistor (140) may be a second driving transistor of a display pixel. The second transistor (140) may be a MOS transistor. The gate of the second transistor (140) may be connected to a control circuit (120), the drain of the second transistor (140) may be connected to the first transistor (130), and the source of the second transistor (140) may be connected to ground (GND).

[0039] The LED (150) may be an LED with any color. For example, the LED (150) may be an LED with any one of the colors white, red, blue, and yellow.

[0040] The LED (150) may include at least one diode (151).

[0041] The positive terminal of the diode (151) is connected to the driving voltage (Vdd), and the negative terminal of the diode (151) can be connected to the drain of the first transistor (130).

[0042] An embodiment of the present invention will be described in more detail as follows.

[0043] First, the driving circuit (110) can be connected to the first transistor (130), and the control circuit (120) can be connected to the second transistor (140). Also, the first transistor (130), the second transistor (140), and the LED (150) can be connected in series.

[0044] The driving circuit (110) and the control circuit (120) can independently apply voltage to each transistor. That is, the driving circuit (110) can apply voltage to the first transistor (130), and the control circuit (120) can apply voltage to the second transistor (140).

[0045] The control circuit (120) can modulate the current flowing through the second transistor (140) and the LED (150) by applying a converted signal to the second transistor (140) according to the signal voltage (Vset).

[0046] The signal voltage (Vset) may have a preset voltage value depending on the RGB pixel. For example, in the case of a blue pixel, the voltage driving the blue pixel may be 1.5V. Subsequently, when the control circuit (120) receives 3V as the signal voltage (Vset), it may output a driving voltage (Vdv) corresponding to the blue pixel as 1.5V.

[0047] Through this, the display pixel can modulate the maximum value of the current applied to the LED (150) by controlling the current flowing through the second transistor (140). At this time, since the color expressed by the LED (150) is related to the height of the current applied to the LED (150), the maximum value of the current applied to the LED (150) can be kept constant to display an accurate gradation.

[0048] Therefore, the display pixel has the advantage of being able to implement a pixel color correction function by controlling the amplitude of the applied current waveform without converting the grayscale data of the pixel in the display panel.

[0049] FIG. 3 is a flowchart illustrating a pixel color correction method according to an embodiment of the present invention.

[0050] A pixel color correction method can be performed by a display pixel. The display pixel includes a driving circuit (110) connected to the gate of a first transistor (130) and a control circuit (120) connected to the gate of a second transistor (140), the source of the first transistor (130) and the drain of the second transistor (140) are connected, and the first transistor (130), the second transistor (140), and the LED (150) can be connected in series.

[0051] The driving circuit (110) of the display pixel can receive an input pulse width modulation signal (PWM_IN) and output an output pulse width modulation signal (PWM_OUT) (S301). At this time, the output signal (PWM_OUT) of the driving circuit (110) corresponds to the input signal (PWM_IN) and can be applied as the gate voltage of the first transistor (130) (S10).

[0052] A control circuit (120) of a display pixel can receive a signal voltage (Vset) and output a driving voltage (Vdv). The control voltage (Vdv) of the control circuit (120) corresponds to a set voltage (Vset) and can be applied as the gate voltage of the second transistor (140) (S20).

[0053] The first transistor (130) can receive the output pulse width modulation signal (PWM_OUT) of the driving circuit (110) and perform a switching operation. The first transistor (130) can perform an ON / OFF operation according to the maximum value of the pulse width modulation signal (PWM_OUT) (S30).

[0054] The second transistor (140) can receive the driving voltage (Vdv) of the control circuit (120) and perform a switching operation. The second transistor (140) can perform an ON / OFF operation according to the maximum value of the pulse width modulation signal (PWM_OUT) (S40).

[0055] When both the first transistor (130) and the second transistor (140) are in the ON state, the LED (150) can also operate in the ON state (S50). The LED (150) can operate based on the driving voltage (Vdv) output from the control circuit (120). At this time, if the control circuit (120) changes the driving voltage (Vdv) to change the current flowing through the second transistor (140), the maximum value of the current applied to the LED (150) can be modulated.

[0056] For example, if the LED (150) is one of a red LED, a green LED, or a blue LED, the control circuit (120) can receive a signal voltage corresponding to each LED and output a driving voltage.

[0057] In the specification above, the "device" and its components are described as performing the invention; however, the "device" and its components are merely names, and the scope of the rights is not subordinate to them.

[0058] In addition, as another aspect of the present invention, the operation of the aforementioned proposal or invention may also be provided as code that can be implemented, carried out, or executed by a "computer" (a comprehensive concept including a system on chip (SoC) or (micro)processor, etc.), or as a computer-readable storage medium or computer program product that stores or contains said code. The scope of the rights of the present invention may be extended to said code or as a computer-readable storage medium or computer program product that stores or contains said code.

[0059] The detailed description of the preferred embodiments of the present invention disclosed as described above is provided so that a person skilled in the art can implement and practice the present invention.

[0060] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention as described in the following claims.

[0061] Accordingly, the present invention is not intended to be limited to the embodiments shown herein, but to be given the broadest scope consistent with the principles and novel features disclosed herein.

[0062] Various embodiments for implementing the present invention have been described in detail in the previous table of contents.

[0063] Since the present invention is applicable to technology related to electronic circuits, its industrial applicability is recognized.

Claims

1. A driving circuit that receives an input pulse width modulation signal (PWM_IN) and outputs an output pulse width modulation signal (PWM_OUT); A control circuit that receives a signal voltage (Vset) and outputs a driving voltage (Vdv); A first transistor that receives the output pulse width modulation signal (PWM_OUT) of the above driving circuit and performs a switching operation; A second transistor that receives the driving voltage (Vdv) of the above control circuit and performs a switching operation; and Includes an LED driven based on the above driving voltage (Vdv). Display pixels.

2. In Paragraph 1, The first transistor, the second transistor, and the LED are connected in series. Display pixels.

3. In Paragraph 2, The first transistor and the second transistor are characterized as being MOS transistors. Display pixels.

4. In Paragraph 3, The gate of the first transistor is connected to the driving circuit, and The gate of the second transistor is connected to the control circuit, and Characterized by the source of the first transistor and the drain of the second transistor being connected. Display pixels.

5. In Paragraph 4, The above control circuit is By changing the driving voltage, the current flowing through the second transistor is changed, and Characterized by modulating the maximum value of the current applied to the LED. Display pixels.

6. In Paragraph 5, The above LED is Characterized by being one of a red LED, a green LED, or a blue LED Display pixels.

7. In Paragraph 6, The above control circuit is Characterized by controlling the driving voltage in response to the signal voltage received corresponding to each LED. Display pixels.

8. A step in which the driving circuit receives an input pulse width modulation signal (PWM_IN) and outputs an output pulse width modulation signal (PWM_OUT); A step in which a control circuit receives a signal voltage (Vset) and outputs a driving voltage (Vdv); A step in which a first transistor receives an output pulse width modulation signal (PWM_OUT) of the driving circuit and performs a switching operation; A step in which a second transistor receives a driving voltage (Vdv) of the control circuit and performs a switching operation; and A step comprising driving an LED based on the above driving voltage (Vdv). Pixel color correction method.

9. In Paragraph 1, The first transistor, the second transistor, and the LED are connected in series. Pixel color correction method.

10. In Paragraph 9, The step of driving the above LED based on the driving voltage (Vdv) A step of changing the current flowing through the second transistor by changing the driving voltage; and A step comprising modulating the maximum value of the current applied to the LED. Pixel color correction method.

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