CN219800459U - Backlight circuit and display device - Google Patents
Backlight circuit and display device Download PDFInfo
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- CN219800459U CN219800459U CN202320925823.XU CN202320925823U CN219800459U CN 219800459 U CN219800459 U CN 219800459U CN 202320925823 U CN202320925823 U CN 202320925823U CN 219800459 U CN219800459 U CN 219800459U
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- 230000008439 repair process Effects 0.000 claims abstract description 131
- 238000000034 method Methods 0.000 claims description 11
- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Abstract
The utility model discloses a backlight circuit and a display device, the backlight circuit is configured to drive a backlight unit, the backlight unit includes a plurality of backlight areas, the backlight circuit includes: a backlight driving unit including a plurality of output channels and respectively connected with the plurality of backlight areas through the plurality of output channels to provide corresponding backlight driving signals; a repair enabling unit connected with the repair enabling end of the backlight driving unit and configured to provide a repair enabling signal; the backlight driving unit further comprises a repair output channel, and backlight driving signals of the selected output channel are provided to the repair output channel according to the repair enable signals in an effective state; and a repair connection unit connecting the repair output channel to the backlight region corresponding to the selected output channel when the repair enable signal is in an active state, thereby repairing the damaged output channel of the backlight driving unit without replacing the backlight driving unit.
Description
Technical Field
The present utility model relates to the field of display technologies, and in particular, to a backlight circuit and a display device.
Background
A liquid crystal display device (Liquid Crystal Display, LCD), which is a display device that changes light transmittance of a light source by utilizing a phenomenon that an arrangement direction of liquid crystal molecules is changed by an electric field, has been widely used in electronic apparatuses such as high definition digital televisions, desktop computers, notebook computers, tablet computers, cellular phones, digital cameras, and the like due to advantages of good display quality, small size, and low power consumption.
The conventional liquid crystal display device has a problem of low contrast, which is caused by the fact that the brightness of the backlight source cannot be precisely controlled, and in order to solve the problem, a local dimming (local dimming) technique has been developed. In the local dimming technique, a backlight unit is divided into a plurality of backlight regions, each of which includes one or more light emitting elements arranged in an array, and a plurality of output channels of a backlight driving circuit are respectively connected to the respective backlight regions to independently control brightness of the respective backlight regions.
However, the local dimming technology also has some problems, for example, when a certain output channel of the backlight driving circuit fails, the brightness of the light emitting element corresponding to the backlight area is abnormal, so that the display effect of the display device is affected.
Accordingly, an improved backlight circuit and display device are desired to solve the above-mentioned problems.
Disclosure of Invention
In view of the foregoing, an object of the present utility model is to provide a backlight circuit and a display device, whereby an output channel damaged by a backlight driving unit in the backlight circuit is repaired without replacing the backlight driving unit.
According to an aspect of the present utility model, there is provided a backlight circuit configured to drive a backlight unit including a plurality of backlight regions, the backlight circuit comprising: a backlight driving unit including a plurality of output channels and respectively connected with the plurality of backlight areas through the plurality of output channels to provide corresponding backlight driving signals; a repair enabling unit connected with the repair enabling end of the backlight driving unit and configured to provide a repair enabling signal; the backlight driving unit further comprises a repair output channel, and backlight driving signals of the selected output channel are provided to the repair output channel according to the repair enable signals in an effective state; and a repair connection unit, one end of which corresponds to a plurality of output channels, the other end of which is connected to the repair output channel, the repair output channel being connected to a backlight region corresponding to the selected output channel when the repair enable signal is in an active state.
Optionally, the repair enabling unit includes: the first end of the first resistor is connected with the repair enabling end, the second end of the first resistor is grounded, and the first end of the first resistor provides the repair enabling signal in an invalid state.
Optionally, the first resistor is disconnected from the repair enable terminal when the output channel fails, the repair enable unit further includes a second resistor, a first terminal of the second resistor is connected to an operating voltage when the output channel fails, a second terminal of the second resistor is connected to the repair enable terminal, and a second terminal of the second resistor provides the repair enable signal in an active state.
Optionally, the resistance value of the first resistor is 4.7kΩ, the resistance value of the second resistor is 4.7kΩ, and the operating voltage is 3.3V.
Optionally, the repair connection unit includes a plurality of reserved resistance bits corresponding to the plurality of output channels; the first terminal of each reserved resistor bit is connected with a corresponding output channel, and the second terminal is connected with the repairing output channel; and the repair resistor is connected with the reserved resistor bit corresponding to the selected output channel so as to connect the repair output channel to the backlight area corresponding to the selected output channel.
Optionally, one end of the repair resistor is connected with the first terminal of the reserved resistor bit, and the other end of the repair resistor is connected with the second terminal of the reserved resistor bit.
Optionally, the repair resistance is 0Ω.
Optionally, the repair enabling unit and the backlight driving unit are located on the same integrated circuit chip.
According to another aspect of the present utility model, there is provided a display device, including: a backlight unit including a plurality of backlight areas; a backlight circuit according to any one of the preceding claims, the backlight circuit being connected to the backlight unit and providing a backlight driving signal to the backlight unit; a timing control circuit connected to the backlight circuit to provide a backlight driving signal of the selected output channel to the repair output channel; a gate driving circuit; the display panel is connected with the display panel to provide grid control signals; and a source driving circuit connected with the display panel to provide data signals.
Optionally, the backlight area includes a plurality of light emitting elements arranged in an array.
When a display device is abnormal due to the fact that a certain output channel is damaged, the repair enabling unit provides a repair enabling signal in an effective state, the backlight driving unit receives the repair enabling signal in the effective state, the backlight driving signal provided by the damaged output channel is provided through the repair output channel, then a repair resistor is connected to a reserved resistor bit of the repair connecting unit corresponding to the repair connecting unit, the repair output channel is connected with the damaged output channel, and the backlight driving signal provided by the repair output channel can be provided to a backlight area corresponding to the damaged output channel to finish repairing the display device.
When a certain output channel of the backlight driving unit is damaged, the backlight circuit and the display device provided by the utility model do not need to replace the backlight driving unit or IC (Integrated Circuit) where the backlight driving unit is positioned, so that the maintenance cost is obviously reduced, and the maintenance difficulty is lower.
Drawings
The above and other objects, features and advantages of the present utility model will become more apparent from the following description of embodiments of the present utility model with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic circuit diagram of a prior art backlight circuit and a backlight unit;
FIG. 2 shows a circuit block diagram of a display device according to an embodiment of the present utility model;
FIG. 3 is a schematic circuit diagram of the backlight circuit and the backlight unit in FIG. 2;
FIG. 4a shows a repair enabling unit in a state in which an output channel of a backlight driving unit is not damaged;
fig. 4b shows the repair enabling unit in a damaged state of the output channel of the backlight driving unit.
Detailed Description
Various embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. The same elements or modules are denoted by the same or similar reference numerals in the various figures. For clarity, the various features of the drawings are not drawn to scale.
It should be appreciated that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and/or elements capable of storing instructions for execution by the programmable circuits. When an element or circuit is referred to as being "connected to" another element or circuit is "connected between" two nodes, it can be directly coupled or connected to the other element or intervening elements may be present, the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, it means that there are no intervening elements present between the two.
Also, certain terms are used throughout the description and claims to refer to particular components. It will be appreciated by those of ordinary skill in the art that a hardware manufacturer may refer to the same component by different names. The present patent specification and claims do not take the form of an element or components as a functional element or components as a rule.
Furthermore, it should be noted that relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 shows a circuit schematic of a prior art backlight circuit and a backlight unit. The backlight module 201 includes a backlight circuit 210 and a backlight unit 220, the backlight circuit 210 includes a backlight driving unit 211, the backlight driving unit 211 includes a plurality of output channels, the backlight unit 220 includes a plurality of backlight areas 221 corresponding to the output channels of the backlight driving unit 211, and each of the backlight areas 221 includes one or more light emitting elements LEDs. The present embodiment is described taking the backlight driving unit 211 including 48 output channels as an example.
Each output channel of the backlight driving unit 211 is connected to a corresponding backlight region 221, respectively, to supply a corresponding backlight driving signal to the corresponding backlight region 221, thereby independently controlling the brightness of each backlight region. However, when one of the output channels of the backlight driving unit 211 is damaged, the corresponding backlight area 221 is abnormal, which affects the display effect of the entire display device 100. The damaged output channel of the backlight driving unit 211 is the selected output channel.
Accordingly, the present utility model provides an improved backlight circuit and display device, as shown in fig. 2 and 3.
Fig. 2 shows a circuit block diagram of a display device according to an embodiment of the utility model. The display device 100 includes a backlight module 202, a display panel 310, a gate driving circuit 320, a source driving circuit 330 and a timing control circuit 340. The backlight module 200 includes a backlight circuit 210 and a backlight unit 220
The display panel 310 includes a plurality of pixel units arranged in an array, each of which mainly includes a thin film transistor (Thin Film Transistor, TFT), a storage capacitor, and a liquid crystal capacitor. Each pixel unit is connected to the gate driving circuit 320 through a gate line and connected to the source driving circuit 330 through a source line. In response to the gate driving signal supplied through the gate line, the pixel unit may receive a data signal through the data line, store the data signal in the storage capacitor, and control light emitted from the backlight unit 220 corresponding to the data signal, thereby displaying brightness corresponding to the data signal.
The timing control circuit 340 is used to control the gate driving circuit 320 and the source driving circuit 330. The timing control circuit 340 may receive an externally provided control signal (e.g., a control signal including a clock signal) and generate a gate control signal and a source control signal based on the control signal.
The gate driving circuit 320 may receive the gate control signal from the timing control circuit 340, generate a gate driving signal based on the gate control signal, and provide the gate driving signal to the corresponding gate line.
The source driving circuit 330 may receive the source control signal and the frame data from the timing control circuit 340, generate a data signal corresponding to the frame data, and supply the data signal to the corresponding data line.
The backlight unit 220 is used to provide backlight to the display panel 310. The display panel 310 of the present embodiment may be implemented in a vertical electric field driving method such as a Twisted Nematic (TN) mode and a Vertical Alignment (VA) mode or in a horizontal electric field driving manner such as an in-plane switching (IPS) mode and a Fringe Field Switching (FFS) mode. The display device of the present embodiment may be implemented as any type of liquid crystal display including a transmissive liquid crystal display and a transflective liquid crystal display, and the backlight unit 220 may be implemented as a direct type backlight unit or an edge light type backlight unit.
The backlight circuit 210 is connected to the backlight unit 220, and provides a backlight driving signal Vpwm to control the turn-on and turn-off of the backlight unit 220.
Further, fig. 3 shows a schematic circuit diagram of the backlight circuit and the backlight unit in fig. 2, the backlight module 202 includes a backlight circuit 210 and a backlight unit 220, the backlight circuit 210 includes a backlight driving unit 212, a repair enabling unit 213 and a repair connecting unit 214, wherein the backlight driving unit 212 includes a plurality of output channels. The backlight unit 220 includes a plurality of backlight areas 221 corresponding to output channels of the backlight driving unit 212, and each of the backlight areas 221 includes one or more light emitting elements LEDs. The backlight circuit 210 and the display device 100 according to the embodiment of the utility model are described below with reference to fig. 2, taking an example in which the backlight driving unit 212 includes 48 output channels.
Specifically, the output channels out1 to out48 of the backlight driving unit 212 are respectively connected to the corresponding backlight regions 221 to supply the corresponding backlight driving signals to the corresponding backlight regions 221, thereby independently controlling the brightness of each backlight region. In the present utility model, the backlight driving unit 212 further includes a Repair enable terminal Repair, and a Repair output channel Repair Out.
The repair enable unit 213 is connected to a repair enable terminal repair of the backlight driving unit 212 and configured to provide a repair enable signal EN. When the output channels out1 to out48 of the backlight driving unit 212 are not damaged, the repair enabling unit 213 includes a first resistor R1 as shown in fig. 4a, a first terminal of the first resistor R1 is connected to the repair enabling terminal repair, a second terminal is grounded, and a first terminal of the first resistor R1 provides the repair enabling signal EN. At this time, the Repair enable signal EN is at a low level, i.e., in an inactive state, and the Repair output channel Repair Out of the backlight driving unit 212 does not supply the backlight driving signal.
When the display device 100 displays an abnormality and detects that one of the output channels of the backlight driving unit 212 is damaged, for example, the output channel out48 is damaged, the repair enabling unit 213 includes a second resistor R2 as shown in fig. 4b, the first end of the second resistor R2 is connected to the operating voltage Vdd, and the second end is connected to the repair enabling terminal repair to provide the repair enabling signal EN, and the repair enabling signal EN is at a high level, that is, in an active state.
In one possible embodiment, the original design of the backlight module 202 includes a first resistor R1, and when one of the output channels of the backlight driving unit 212 is detected to be damaged, the first resistor R1 is disconnected from the repair enable terminal and connected to a second resistor R2. The first resistor R1 is removed, for example, by removing the first resistor R1 or by disconnecting the lead between the first resistor R1 and the enable repair end repair.
The backlight driving unit 212 receives the Repair enable signal EN in an active state, and supplies the backlight driving signal output from the output channel Out48 to the Repair output channel Repair Out. Specifically, the backlight circuit 210 is further connected to the timing control circuit 340, and when the Repair enable signal EN is in an active state, the timing control circuit 340 is adjusted to provide the data of the register corresponding to the output channel Out48 of the backlight driving unit 212 into the register corresponding to the Repair output channel Repair Out, so as to realize that the backlight driving signal sent Out by the output channel Out48 is sent Out through the Repair output channel Repair Out.
In one possible embodiment, the first resistor R1 has a resistance of 4.7kΩ, the second resistor R2 has a resistance of 4.7kΩ, and the operating voltage Vdd is 3.3V.
One end of the repair connection unit 214 corresponds to a plurality of output channels, and the other end of the repair connection unit 214 is connected to the repair output channel repaireout. Specifically, the Repair connection unit 214 includes a plurality of reserved resistor bits 2141, wherein a first terminal of each reserved resistor bit 2141 is connected to the output channels Out1 to Out48, respectively, and a second terminal is connected to the Repair output channel Repair Out. When the output channel Out48 is damaged, the Repair resistor Rrepair is connected to the reserved resistor bit 2141 corresponding to the output channel Out48, so that the Repair output channel Repair Out is connected to the backlight area 221 corresponding to the output channel 48, so as to provide the corresponding backlight driving signal to the corresponding backlight area 221, thereby completing the Repair of the display device 100. Specifically, one end of the repair resistor Rrepair is connected to the first terminal of the reserved resistor bit 2141 corresponding to the damaged output channel, and the other end of the repair resistor Rrepair is connected to the second terminal of the reserved resistor bit 2141 corresponding to the damaged output channel, so that the repair resistor Rrepair is connected to the reserved resistor bit 2141 of the repair connection unit 214.
In one possible embodiment, the repair resistor has a resistance value of 0Ω.
In summary, in the backlight circuit 210 and the display device 100 provided by the present utility model, when a display abnormality occurs in the display device 100 due to a damaged output channel, the Repair enable unit 213 provides the Repair enable signal EN in an active state, the backlight driving unit 212 receives the Repair enable signal EN in an active state, provides the backlight driving signal provided by the damaged output channel through the Repair output channel Repair Out, and connects the Repair output channel Repair Out with the damaged output channel by accessing the Repair resistor rrepa in the reserved resistor bit 2141 corresponding to the Repair connection unit 214, so that the backlight driving signal provided by the Repair output channel Repair Out can be provided to the backlight area corresponding to the damaged output channel, thereby completing the Repair of the display device 100.
When a certain output channel of the backlight driving unit 212 is damaged, the backlight circuit 210 and the display device 100 provided by the utility model do not need to replace the backlight driving unit 212 or the IC (Integrated Circuit) where the backlight driving unit 212 is located, so that the maintenance cost is significantly reduced and the maintenance difficulty is lower.
It should be noted that the words "during", "when" and "when … …" as used herein in relation to circuit operation are not strict terms indicating an action that occurs immediately upon the start of a start-up action, but rather there may be some small but reasonable delay or delays between it and the reaction action (reaction) initiated by the start-up action, such as various transmission delays and the like, as will be appreciated by those of ordinary skill in the art.
Embodiments in accordance with the present utility model, as described above, are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model and various modifications as are suited to the particular use contemplated. The scope of the utility model should be determined by the appended claims and their equivalents.
Claims (10)
1. A backlight circuit configured to drive a backlight unit, the backlight unit comprising a plurality of backlight areas, the backlight circuit comprising:
a backlight driving unit including a plurality of output channels and respectively connected with the plurality of backlight areas through the plurality of output channels to provide corresponding backlight driving signals;
a repair enabling unit connected with the repair enabling end of the backlight driving unit and configured to provide a repair enabling signal;
the backlight driving unit further comprises a repair output channel, and backlight driving signals of the selected output channel are provided to the repair output channel according to the repair enable signals in an effective state; the method comprises the steps of,
one end of the repair connection unit corresponds to the plurality of output channels, the other end of the repair connection unit is connected with the repair output channels,
the repair output channel is connected to the backlight area corresponding to the selected output channel when the repair enable signal is in an active state.
2. The backlight circuit of claim 1, wherein the repair enable unit comprises:
the first end of the first resistor is connected with the repair enabling end, the second end of the first resistor is grounded, and the first end of the first resistor provides the repair enabling signal in an invalid state.
3. A backlight circuit according to claim 2, wherein,
the first resistor is disconnected with the repair enabling end when the output channel fails, the repair enabling unit further comprises a second resistor, the first end of the second resistor is connected to the working voltage when the output channel fails, the second end of the second resistor is connected with the repair enabling end, and the second end of the second resistor provides the repair enabling signal in an effective state.
4. A backlight circuit according to claim 3, wherein the first resistor has a resistance of 4.7kΩ, the second resistor has a resistance of 4.7kΩ, and the operating voltage is 3.3V.
5. The backlight circuit of claim 1, wherein the repair connection unit comprises a plurality of reserved resistance bits corresponding to the plurality of output channels;
the first terminal of each reserved resistor bit is connected with a corresponding output channel, and the second terminal is connected with the repairing output channel;
and the repair resistor is connected with the reserved resistor bit corresponding to the selected output channel so as to connect the repair output channel to the backlight area corresponding to the selected output channel.
6. The backlight circuit of claim 5, wherein one end of the repair resistor is connected to a first terminal of the reserved resistor bit and the other end of the repair resistor is connected to a second terminal of the reserved resistor bit.
7. The backlight circuit of claim 5, wherein the repair resistance is 0Ω.
8. A backlight circuit according to claim 1, wherein the repair enabling unit is located on the same integrated circuit chip as the backlight driving unit.
9. A display device, characterized in that the display device comprises:
a backlight unit including a plurality of backlight areas;
the backlight circuit according to any one of claims 1 to 8, being connected to the backlight unit and providing a backlight driving signal to the backlight unit;
a timing control circuit connected to the backlight circuit to provide a backlight driving signal of the selected output channel to the repair output channel;
a gate driving circuit; the display panel is connected with the display panel to provide grid control signals; the method comprises the steps of,
the source electrode driving circuit is connected with the display panel to provide data signals.
10. The display device according to claim 9, wherein the backlight region includes a plurality of light emitting elements arranged in an array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320925823.XU CN219800459U (en) | 2023-04-23 | 2023-04-23 | Backlight circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320925823.XU CN219800459U (en) | 2023-04-23 | 2023-04-23 | Backlight circuit and display device |
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| Publication Number | Publication Date |
|---|---|
| CN219800459U true CN219800459U (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320925823.XU Active CN219800459U (en) | 2023-04-23 | 2023-04-23 | Backlight circuit and display device |
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| CN (1) | CN219800459U (en) |
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- 2023-04-23 CN CN202320925823.XU patent/CN219800459U/en active Active
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