CN210925448U - Monochromatic OLED display panel - Google Patents

Abstract

The utility model discloses a monochromatic OLED display panel, including display element, with display element communication connection's drive circuit, display element includes the base plate, is a plurality of pixel units of array arrangement on the base plate, pixel unit includes at least two sub-pixels; the driving circuit comprises a signal processor for converting RGB signals into single-path signals, a shift register, a latch, a level shifter, gating switches respectively and electrically connected with the sub-pixels correspondingly, and gating control signals acting on the gating switches, wherein the gating switches are connected between the level shifter and the sub-pixels. The utility model discloses a monochromatic OLED display panel can pass through based on traditional RGB signal drive circuit selective control the sub-pixel circulation enables, consequently can reduce same sub-pixel and last the emission time, solves monochromatic OLED display panel's ghost problem, increases monochromatic OLED display panel's life.

Description

Monochromatic OLED display panel

Technical Field

The utility model relates to a OLED shows the field, especially one kind can eliminate or weaken ghost phenomenon, improve the monochromatic OLED display panel of OLED display device life-span.

Background

The display ghost of the OLED display is mainly characterized in that the same picture or a still picture is played for a long time, so that the light emitting time of partial sub-pixels is longer than that of other sub-pixels, and finally, the brightness difference of the sub-pixels is caused due to the service life difference of OLED organic light emitting materials with different colors, and the ghost is formed. At present, the research and development directions for solving and optimizing the afterimage phenomenon of the OLED display device and prolonging the service life of the OLED display device mainly include:

according to the direction of pixel design and arrangement, the areas of the sub-pixels with different colors are designed differently mainly aiming at the different display lives of OLED organic light-emitting materials with different colors, and by taking a blue sub-pixel as an example, the light-emitting area of the blue light display sub-pixel with low service life is increased so as to reduce the pixel driving current and further improve the display life of blue light. However, the effect is not satisfactory, and still pictures cannot be displayed for a long time.

Based on the detected still picture, and cyclically displaying adjacent pixels in the detected still picture region. The same sub-pixel is prevented from being lightened for a long time, so that the generation of afterimages is reduced. However, the method has high requirements for automatically detecting the still picture, and the picture which is not still but has similar color cannot be detected; when large-area display of pictures with the same color is required, the circular display method cannot work.

In view of the above, there is a need for an improved monochrome OLED display panel to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can eliminate or weaken afterimage phenomenon, improve the monochromatic OLED display panel of OLED display device life-span.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a monochrome OLED display panel comprises a display unit and a drive circuit in communication connection with the display unit, wherein the display unit comprises a substrate and a plurality of pixel units arranged on the substrate in an array manner, and each pixel unit comprises at least two sub-pixels; the driving circuit comprises a signal processor for converting RGB signals into single-path signals, a shift register in communication connection with the model processor, a latch in communication connection with the shift register, a level shifter in communication connection with the latch, gating switches respectively and electrically connected with the sub-pixels, and gating control signals acting on the gating switches, wherein the gating switches are connected between the level shifter and the sub-pixels.

Further, the RGB signals are digital signals, and the signal processor includes a digital adder that converts the RGB digital signals into one-way signals.

Further, the RGB signals are analog signals, and the signal processor includes an a/D converter that converts the RGB analog signals into RGB digital signals, and a digital adder that converts the RGB digital signals into one-way signals.

Further, the RGB signals are analog signals, and the signal processor includes an analog signal adder capable of converting the RGB analog signals into monochrome analog signals, and an a/D converter capable of converting the monochrome analog signals into monochrome digital signals.

Further, the driving circuit further comprises a clock module acting on the gating control signal.

Further, the clock module comprises an internal phase-locked loop and a clock signal source.

Further, the pixel unit includes at least three sub-pixels.

Further, the emission color of all the sub-pixels is the same.

Compared with the prior art, the utility model discloses a monochromatic OLED display panel can be based on traditional RGB signal, through the sub-pixel that drive circuit selection part was listed as enables, the sub-pixel that another part was listed as is in idle state; after the preset time, the sub-pixels which are in the idle state are enabled, and the sub-pixels which are in the enabled state are in the idle state, namely, the sub-pixels are enabled in a circulating mode, so that the continuous light emitting time of the same sub-pixel can be reduced, the problem of afterimage of the single-color OLED display panel is solved, and the service life of the single-color OLED display panel is prolonged.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic partial structural view of a monochrome OLED display panel according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of a driving circuit according to a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of the signal selector and a portion of the OLED display panel according to a preferred embodiment of the present invention;

fig. 4 is a schematic diagram of the signal processor, the signal selector and the power line according to a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of the driving circuit enabling each of the sub-pixels cyclically with a frame display period;

fig. 6 is a schematic diagram of the driving circuit enabling two of the sub-pixels simultaneously in a cycle of a frame display period.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Referring to fig. 1 to 4, a monochrome OLED display panel includes a display unit and a driving circuit for controlling the display unit to emit light.

Referring to fig. 1, the display unit includes a substrate and a plurality of pixel units arranged in an array on the substrate, and the pixel units include at least two sub-pixels having the same light emitting color. Therefore, when light emission is needed, part of the sub-pixels can be selected to be enabled through the driving circuit, and the other part of the sub-pixels are in an idle state; after the preset time, the sub-pixels which are in the idle state are enabled, the sub-pixels which are in the enabled state are in the idle state, namely the sub-pixels can be enabled alternately, so that the continuous light emitting time of the same sub-pixel can be reduced, the problem of residual images of the single-color OLED display panel is solved, and the service life of the single-color OLED display panel is prolonged.

Further, the pixel unit includes at least three sub-pixels; therefore, the sub-pixels can be enabled alternately, and the two sub-pixels can be enabled simultaneously, so that the continuous display time of the same sub-pixel is reduced under the condition of not losing the brightness as much as possible, the aging speed is reduced, the generation of the residual image is reduced, and the service life of the display panel is prolonged.

In a specific embodiment, the pixel unit comprises three identical sub-pixels B0, B1 and B2; in the case of the conventional 800 × 600 display panel, the number of sub-pixels in the present application is (800 × 3) × 600.

Further, the light emitting colors of all the sub-pixels are the same, that is, the colors of all the sub-pixels are the same when the same current is applied, and the distance between the sub-pixels is small, so that when different sub-pixels are selected to emit light, the light emitting interface does not change.

Referring to fig. 2 to 4, the driving circuit includes a signal processor for converting RGB signals into one-way signals, a shift register communicatively connected to the signal processor, a latch communicatively connected to the shift register, a level shifter communicatively connected to the latch, gate switches electrically connected to the sub-pixels in a one-to-one correspondence, and gate control signals applied to the gate switches, wherein the gate switches are connected between the level shifter and the sub-pixels, and determine whether to enable the sub-pixels according to the received gate control signals.

The signal processor is internally integrated with a multi-path adder module, converts traditional RGB signals into single-path signals, specifically, the traditional RGB signals are added and then averaged, and the process is finished to convert color video signals into single-color signals.

In a specific embodiment, the RGB signals are digital signals, and the signal processor is internally integrated with a multi-channel digital adder, which converts the conventional RGB digital signals into single-channel digital signals, specifically, adds the input RGB digital signals and then takes an average value, and this process completes the conversion of the color digital video signals into monochrome digital signals.

The level shifter converts the single-color digital signal provided by the digital adder into an analog driving signal, the analog driving signal reaches the gate switch and is selectively output to the corresponding source line under the action of the gate control signal, and part or all of the sub-pixels in the pixel unit are driven to light under the action of the source driving voltage.

The shift register receives a trigger signal, the latch is connected with the shift register in a communication mode and latches and outputs gray scale data, the level shifter is connected with the latch in a communication mode and receives a reference voltage provided by power drive, the level shifter converts a digital signal latched by the latch into an analog drive voltage based on the reference voltage provided by the power drive, and the gating switch outputs the analog drive voltage to the sub-pixels after receiving a gating control signal.

Taking the MOSFET as the gating switch as an example, the source of the MOSFET is connected to the level shifter, the drain of the MOSFET is connected to the sub-pixel, and the gate of the MOSFET is connected to the gating control signal. The gating switch judges whether the analog driving voltage is output to the sub-pixel or not according to a selection control signal; the selection control signal is input from outside or provided by a clock module. The utility model discloses a drive circuit is according to gating control signal control gating switch's break-make to according to predetermined order to at least part sub-pixel circulation enables, reduces the production of ghost.

The driving circuit also comprises a clock module which acts on the gating control signal and can provide a clock signal to control the on-off of the gating switch according to time sequence. Specifically, the clock module includes an internal phase-locked loop integrated on a chip, and a clock signal source, where the clock signal source may be an integrated clock, and may be a signal input by an external clock.

In another embodiment, the externally supplied RGB signals are analog signals, and the signal processor includes an a/D converter converting the RGB analog signals into RGB digital signals, and a digital adder converting the RGB digital signals into one-way digital signals. The A/D converter converts the RGB analog signal into RGB digital signal, and the RGB digital signal is converted into single-channel digital signal or monochrome signal by the digital adder module. Other structural units are not described in detail herein.

Through the combination of the digital adder and the A/D converter, the input RGB signals are not limited to TTL signals any more, and analog video signal driving can be supported.

In another embodiment, the externally supplied RGB signals are analog signals, and the signal processor includes an analog signal adder capable of converting the RGB analog signals into monochrome analog signals, and an a/D converter capable of converting the monochrome analog signals into monochrome digital signals. The analog RGB signals are input and added by an analog signal adder to be converted into monochrome analog signals, the monochrome analog signals are converted into monochrome digital signals through an A/D converter, and the monochrome digital signals pass through a shift register, a latch, a level shifter and the like to reach a gating switch.

In a preferred embodiment, each of the sub-pixels is enabled cyclically with a frame display as a period.

Taking the pixel unit including three identical sub-pixels B0, B1 and B2 as an example, as shown in fig. 5, in a static picture, the monochrome OLED display panel displays frames as a period, and in the case where one sub-pixel is enabled, the other two sub-pixels in the same group are in an idle state, and the same procedure is performed when one of the other two sub-pixels is enabled.

Or, as shown in fig. 6, in a static picture, the monochrome OLED display panel uses frame display as a period, and when two subpixels are enabled, another subpixel in the same group is in an idle state, and this refreshing method can reduce the continuous display time of the same pixel without losing brightness as much as possible, slow down the aging speed, reduce the occurrence of afterimages, and improve the service life of the display panel.

To sum up, the monochrome OLED display panel of the present invention can select a part of the sub-pixels to be enabled through the driving circuit, and the other part of the sub-pixels are in an idle state; after the preset time, the sub-pixel in the original idle state is enabled, and the sub-pixel in the original enabled state is in the idle state, so that the continuous light-emitting time of the same sub-pixel can be reduced, the problem of afterimage of the single-color OLED display panel is solved, and the service life of the single-color OLED display panel is prolonged.

Although certain specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (8)

1. A monochrome OLED display panel comprises a display unit and a drive circuit in communication connection with the display unit, wherein the display unit comprises a substrate and a plurality of pixel units arranged on the substrate in an array manner, and each pixel unit comprises at least two sub-pixels; the driving circuit is characterized by comprising a signal processor for converting RGB signals into single-path signals, a shift register which is in communication connection with the signal processor, a latch which is in communication connection with the shift register, a level shifter which is in communication connection with the latch, gating switches which are respectively and correspondingly electrically connected with the sub-pixels, and gating control signals which act on the gating switches, wherein the gating switches are connected between the level shifter and the sub-pixels.

2. The monochrome OLED display panel of claim 1 wherein the RGB signals are digital signals and the signal processor includes a digital adder that converts the RGB digital signals to a one-way signal.

3. The monochrome OLED display panel of claim 1 wherein the RGB signals are analog signals and the signal processor includes an a/D converter to convert the RGB analog signals to RGB digital signals, a digital adder to convert the RGB digital signals to a one-way signal.

4. The monochrome OLED display panel of claim 1 wherein the RGB signals are analog signals and the signal processor includes an analog signal adder capable of converting the RGB analog signals to monochrome analog signals, an a/D converter capable of converting the monochrome analog signals to monochrome digital signals.

5. The monochrome OLED display panel of claim 1 wherein the driver circuit further includes a clock module that acts on the gate control signal.

6. The monochrome OLED display panel of claim 5 wherein the clock module includes an internal phase-locked loop, a clock signal source.

7. The monochrome OLED display panel of any of claims 1-6 wherein the pixel cell includes at least three subpixels.

8. The monochrome OLED display panel of any of claims 1-6 wherein all of the sub-pixels emit light of the same color.

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