Display Driving Chip Backlight Control via Pulse Signal
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Solution Overview
Problem
Current methods for driving mini LEDs in liquid crystal display devices are costly due to the need for multiple driving chips or field programmable gate arrays (FPGAs), which increase production expenses.
Innovation Solution
A driving method that uses a driving chip bonded to the display panel to generate pulse signals based on theoretical and actual brightness values, eliminating the need for additional chips or FPGAs by utilizing existing pulse signals and connecting free pins to switches in the backlight source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light-exiting region is divided into a larger number of sub-regions to control light-emitting brightness more precisely, then brightness control precision is improved, but the number of driving chips increases resulting in higher production cost
Solution Approach 1:
The existing driving chip originally designed for controlling display pixels is made to perform dual functions: both driving the display panel and driving the mini LEDs in the backlight source. The driving chip includes a display panel driving circuit and a backlight driving circuit, allowing one chip to control multiple functions, thereby reducing the need for additional dedicated backlight driving chips while maintaining precise brightness control through the existing chip's capabilities
2Measurement precision
If an FPGA is used to output driving signals to mini LEDs for precise brightness control, then brightness control precision is improved, but the FPGA occupies larger space on printed circuit board resulting in increased production cost
Solution Approach 1:
The patent combines the backlight driving function with the existing driving chip that is already bonded to the display panel. Instead of using a separate FPGA or additional driving circuit board, the backlight driving circuit is integrated into the same chip that drives the display panel. This merging eliminates the need for separate FPGA components and reduces the overall space occupation on the printed circuit board while maintaining precise brightness control capabilities
3Adaptability or versatility
If additional chips or FPGAs are used to drive mini LEDs, then driving functionality is improved, but production cost increases
Solution Approach 1:
The driving chip is designed with multi-functionality to include both display panel driving capabilities and backlight driving capabilities. The chip contains a display panel driving circuit for controlling the display and a backlight driving circuit for controlling mini LEDs, allowing a single chip to perform multiple functions that would traditionally require separate components, thereby reducing production cost while maintaining comprehensive driving functionality
Solution Approach 2:
The existing driving chip that is already present in the display device is made to serve itself by adding backlight driving functionality to its existing display panel driving functionality. The driving chip utilizes its existing resources and capabilities to also drive the backlight, eliminating the need for additional external driving components and reducing overall system complexity and production cost
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the driving cost of the backlight source and overall production cost of the display device by leveraging existing pulse signals and minimizing additional connection structures.
Implementation Method 1
the light-emitting diode to emit light under an action of a first power supply signal and a second power supply signal
Data Source
AI summary
Provided is a driving method for a display device. The driving method includes: obtaining, by the driving chip, a theoretical brightness value of the light-emitting diode in each of the plurality of light-exiting sub-areas based on an image to be displayed on the display panel; obtaining an actual brightness look-up table, searching the actual brightness look-up table for an actual brightness value closest to the theoretical brightness value, and setting the actual brightness value closest to the theoretical brightness value as a first brightness value; and generating a first pulse signal based on the first brightness value and outputting the first pulse signal to the switch in each of the plurality of light-exiting sub-areas, in such a manner that the switch controls, under driving of the first pulse signal, the light-emitting diode to emit light under an action of a first power supply signal and a second power supply signal.